DEV22 min readPlatform Guide

How to Analyze Log Files on iPhone: A Step-by-Step Guide with ShowPro

ShowPro Team

Expert tool tutorials · showprosoftware.com

Updated June 14, 2026

You've just received an urgent email from a client, or perhaps your own app is misbehaving. Attached is a crucial log file – maybe a .log, .txt, or even a .json diagnostic dump. You're on the go, your laptop is miles away, and you desperately need to inspect that file right now, on your iPhone. You tap the attachment, hoping for a quick preview, only to be met with a blank screen, an unhelpful "Cannot Open File," or a prompt to download yet another app from the App Store. Sound familiar?

This is a common frustration for anyone trying to perform serious debugging or data analysis directly on their mobile device. While iPhones are powerful, they aren't natively equipped with robust log file viewers or analyzers that can handle large, complex text files with advanced filtering capabilities. The typical journey involves:

No Native Support: iOS lacks a built-in, feature-rich text editor capable of handling multi-megabyte log files, let alone offering search, filter, or regex functionalities.

App Ecosystem Overload: The App Store offers a myriad of "log viewer" apps, but they often come with significant drawbacks:

* Storage Consumption: Installing yet another app eats into your precious iPhone storage.

* Privacy Concerns: Many require you to upload your potentially sensitive log files to their servers for processing, raising immediate GDPR, HIPAA, or CCPA compliance red flags.

* Hidden Costs: "Free" apps frequently impose restrictive limits on file size, features, or introduce watermarks, pushing you towards expensive subscriptions for basic functionality.

Cumbersome Workflows: You might resort to emailing the file to yourself, opening it on a desktop, analyzing it, and then sending findings back to your iPhone – a time-consuming and inefficient process that defeats the purpose of mobile productivity.

This is where ShowPro Software's Log File Analyzer for iPhone revolutionizes your workflow. We've engineered a powerful, browser-based solution that brings desktop-grade log analysis capabilities directly to your Safari browser on iOS, with an unparalleled commitment to privacy and performance. No app installs, no server uploads, just instant, secure analysis right on your device.

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Introduction: Why Analyze Logs on Your iPhone with ShowPro?

The modern developer, IT professional, or power user needs immediate insights, regardless of location. Debugging an application, diagnosing a server issue, or understanding user behavior often starts with diving into log files. The growing need for on-the-go debugging and immediate insights from mobile devices means you can't always wait to get back to a desktop.

ShowPro's unique privacy-first, browser-based approach eliminates the need for app installs and server uploads on iOS. This means you can quickly diagnose issues from anywhere without transferring sensitive files off your iPhone. Our Log File Analyzer leverages cutting-edge web technologies to perform all processing 100% client-side. Your log files never leave your iPhone's browser, ensuring complete data privacy and eliminating any GDPR/HIPAA/CCPA compliance concerns for sensitive mobile data. There's no account required, no personal data collected, and completely anonymous use on iOS devices.

Imagine being able to open a multi-gigabyte server log, search for specific error codes, filter by timestamp, and identify the root cause of an issue – all from your iPhone's Safari browser. ShowPro makes this not just possible, but incredibly efficient and secure.

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Getting Your Log Files Ready for iPhone Analysis

Before you can analyze your logs, you need to get them onto your iPhone and accessible. Here's how to prepare your files for optimal analysis with ShowPro's log file analyzer iphone tool.

Common Sources of Log Files on iOS

Log files can originate from various places on your iPhone:

App Diagnostics: Many apps offer "Export Logs" or "Share Diagnostics" features. These often generate .log, .txt, or .json files that can be saved to your Files app or shared directly.

System Logs (Developer Mode): For developers, specific tools or Xcode integrations can pull system-level logs from a connected device. Once obtained, these can be transferred to your iPhone.

Downloaded Server Logs: If you manage a server, you might download logs (e.g., Apache access logs, Nginx error logs, application logs) directly to your iPhone via Safari or a cloud storage app.

Email Attachments: As mentioned, log files are frequently shared as email attachments.

Methods for Transferring Files to Your iPhone

Getting files onto your iPhone so the Log File Analyzer can access them is straightforward:

Files App: This is your central hub for file management on iOS. You can save files directly to "On My iPhone" or to connected cloud services like iCloud Drive, Google Drive, Dropbox, or OneDrive.

iCloud Drive: If your log files are on a Mac or another Apple device, saving them to iCloud Drive makes them instantly accessible on your iPhone via the Files app.

AirDrop: For quick transfers from a nearby Mac or another iOS device, AirDrop is incredibly convenient. Select the file, choose "Share," and then "AirDrop" to your iPhone. The file will typically open in an app or prompt you to save it to the Files app.

Email Attachments: When you receive a log file as an email attachment, tap and hold the attachment. You'll usually see an option like "Save to Files" or "Share" which allows you to store it locally.

Direct Safari Downloads: If a log file is hosted online (e.g., on a server or a public link), you can simply open the URL in Safari on your iPhone, and Safari will download it to your "Downloads" folder within the Files app.

Handling Compressed Archives (.zip, .tar.gz) Directly on iOS

Often, log files are bundled into compressed archives like .zip or .tar.gz. The good news is that iOS has native support for these:

Open in Files App: Locate the compressed file in your Files app (e.g., in "Downloads" or iCloud Drive).

Tap to Decompress: Simply tap the .zip or .tar.gz file. iOS will automatically create a new folder with the same name, containing the extracted contents. For .tar.gz files, you might need to tap twice: once for .gz to .tar, and then again for .tar to extract the files.

Ensuring Your Log Files Are in a Readable Text Format

ShowPro's Log File Analyzer works best with plain text files. This includes:

.log

.txt

.json (JSON logs are fully supported and can even be piped to our [JSON Formatter & Validator](https://showprosoftware.com/tools/json-formatter) for pretty-printing and validation)

.xml (XML logs are also handled, with support for the XML 1.1 W3C spec)

.csv (While primarily for logs, simple CSV files can be viewed and searched, and for structured CSV analysis, consider our [CSV to Markdown Table](https://showprosoftware.com/tools/csv-to-markdown) tool)

.yaml (YAML 1.2 spec is understood for logs using this format)

Ensure your file isn't encrypted or in a proprietary binary format that can't be read as plain text. The tool will attempt to detect the Content-Type MIME type via magic bytes to provide the best parsing experience.

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Step-by-Step Guide: Using ShowPro's Log File Analyzer on Safari (iOS)

Now that your log files are ready, let's walk through using the log file analyzer iphone tool on your Safari browser.

1. Navigating to the Tool

Open Safari: Launch the Safari browser on your iPhone.

Go to ShowPro: Type showprosoftware.com/tools/log-file-analyzer into the address bar and press Go. You'll be greeted by the clean, intuitive interface of our Log File Analyzer.

2. Loading Your Log File

Tap 'Choose File': On the tool's page, you'll see a prominent button labeled "Choose File" (or similar, depending on your iOS version and Safari's localization). Tap this button.

Access the iOS Files App Picker: Safari will now present the standard iOS file picker interface. This is crucial because it allows you to securely access files stored locally on your iPhone, in iCloud Drive, or other connected cloud services, without uploading them to any external server.

* You'll see options like "Browse," "Recents," and direct access to "iCloud Drive" or "On My iPhone."

* Navigate to the location where you saved your log file (e.g., "Downloads," a specific app folder, or iCloud Drive).

Select Your Log File: Tap on the desired log file (e.g., crash_report_2023-10-27.log). Once selected, the file picker will close, and ShowPro's Log File Analyzer will immediately begin processing the file directly within your Safari browser.

* Technical Insight: This instantaneous processing is powered by WebAssembly (Wasm) and JavaScript, allowing complex operations to run at near-native speed directly on your iPhone's CPU. The Canvas API might be used for rendering large text efficiently, avoiding DOM performance bottlenecks. Your data is processed entirely by your device's JavaScript engine, leveraging functions like JSON.parse and JSON.stringify for JSON logs, and advanced regex engines for pattern matching.

3. A Detailed Walkthrough of the ShowPro Interface

Once your log file is loaded, the ShowPro interface provides powerful tools for analysis:

Log Display Area: The main section displays your log file content, often with line numbers for easy reference.

Search Bar: At the top, a search bar allows you to quickly find keywords or phrases.

* Example: Type ERROR or failed authentication and press Enter or the search icon. The display will highlight matching lines and filter the view to show only relevant entries.

Filter Options: Adjacent to the search bar, you'll find options for advanced filtering:

* Case Sensitive/Insensitive: Toggle this to refine your searches.

* Regular Expressions (Regex): This is where the real power lies. Toggle the regex option (often represented by .* or RegEx).

* Technical Insight: ShowPro's regex engine is highly optimized for client-side execution. While often based on ECMAScript regex for JavaScript, it aims to provide capabilities similar to PCRE (Perl Compatible Regular Expressions) for powerful pattern matching. For example, you could search for \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}.*ERROR to find all error messages with a specific timestamp format.

* Invert Filter: Show lines that *do not* match your search criteria.

Line Numbers & Navigation: Line numbers are displayed on the left, helping you pinpoint exact locations. For very large files, scroll bars are optimized for mobile touch interaction.

Download Options: After filtering or if you want to save the modified log, you'll find a download button (often a downward arrow icon). Tapping this will download the currently displayed log content (filtered or full) back to your iPhone's "Downloads" folder in the Files app.

4. Practical Example: Loading and Performing a Basic Search on an iOS Crash Log Snippet

Let's say you have a file named MyApp_Crash_20231027.log from your app's diagnostics.

Load the File: Follow steps 1 and 2 above to load MyApp_Crash_20231027.log into the Log File Analyzer.

Basic Search: In the search bar, type CRASH and ensure the "Case Sensitive" toggle is off.

Observe Results: Instantly, the log display will filter to show only lines containing "CRASH" (e.g., CRASH REPORT, Application crashed at address 0x...). This gives you an immediate overview of the critical events.

Refine with Regex: Now, clear the search and enable the "RegEx" toggle. Try searching for ^(?!.*INFO).*ERROR to find all lines containing "ERROR" but *not* "INFO". This quickly narrows down to actual problems, ignoring informational messages.

This entire process happens in milliseconds, directly on your iPhone, without any data ever leaving your device.

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Interpreting and Actioning Your iPhone Log Analysis Results

Analyzing logs on your iPhone isn't just about finding text; it's about understanding the story your logs tell. ShowPro's tool empowers you to extract meaningful insights.

Identifying Common Log Levels in a Mobile Context

Logs often use standardized levels to indicate severity. On your iPhone, look for:

INFO: General information about application flow. Often verbose, but useful for tracing execution paths.

WARN: Potential issues that don't immediately cause problems but might indicate future trouble (e.g., deprecated API usage, slow network response).

ERROR: Problems that prevent a specific operation from completing (e.g., file not found, network request failed). These are critical for mobile debugging.

DEBUG: Highly detailed information, usually only enabled during development, for pinpointing exact code execution.

FATAL/CRITICAL: Severe errors that cause the application or a core service to crash or become unusable.

Use the search and filter functions to quickly isolate these levels. For instance, searching for ERROR|FATAL (using regex) can show you all critical issues.

Filtering Logs by Timestamp Ranges

Most log entries include a timestamp. This is invaluable for focusing on recent events or specific timeframes. While ShowPro doesn't have a built-in date range picker (yet), you can leverage regex for powerful timestamp filtering:

Focus on a Specific Day: If your logs use YYYY-MM-DD format, search for 2023-10-27.

Focus on a Time Window: To find logs between 10 AM and 11 AM on a specific day, you might use a regex like 2023-10-27 10:[0-5][0-9]:[0-5][0-9]|2023-10-27 11:00:00 (adjusting for your log's exact format and desired precision). This allows you to pinpoint events around a reported issue.

Searching for Specific Keywords Relevant to Mobile Debugging

Beyond log levels, specific keywords illuminate mobile-specific problems:

failed, failure: General operation failures.

timeout: Network or process timeouts, common in mobile environments with unstable connections.

crash, exception: Application crashes or unhandled exceptions.

permission denied: Issues with accessing camera, microphone, location, or files.

memory warning, OOM: Out-of-memory errors, critical for mobile performance.

network error, connection refused: Connectivity problems.

authentication failed: Login or API authentication issues.

disk full: Storage-related problems.

Using Regular Expressions for Advanced Pattern Matching within Your iPhone Logs

Regular expressions (regex) are your best friend for complex log analysis. ShowPro's tool supports a robust regex engine.

Finding IP Addresses: \b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b

Extracting User IDs: userId: (\w+)

Matching Specific HTTP Status Codes: HTTP/\d\.\d" (\d{3}) – then filter for 404 or 500.

Excluding Patterns: ^(?!.*DEBUG).* to show everything except DEBUG messages.

Cron Job Analysis: If your logs contain cron job entries, you might search for patterns matching POSIX cron syntax, like ^\S+\s+\S+\s+\S+\s+\S+\s+\S+\s+(.*) to extract the command being run.

Exporting Filtered or Full Results for Sharing or Further Analysis

Once you've refined your view, you have options for the output:

Download Filtered Log: Tap the download icon. This will save the *currently displayed* content (your filtered results) as a new text file to your iPhone's "Downloads" folder. This is perfect for sharing only the relevant snippets.

Download Full Log: If you want the original, unfiltered log, you can simply re-load it or use the download option without applying filters.

iOS Share Sheet: After downloading, you can use the iOS Share Sheet from the Files app to send the log via email, Messages, AirDrop, or save it to another cloud service.

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Advanced Workflow Tips for iPhone Log Analysis with ShowPro

Maximize your productivity when using the log file analyzer iphone tool with these iOS-specific tips.

Leveraging iOS Multitasking Features

Split View (on compatible iPhones like Plus/Max models and iPad): If your iPhone supports it, you can open Safari with ShowPro's analyzer on one side and another app (like Notes, a code editor, or documentation) on the other. This allows you to compare log entries with code snippets or bug reports in real-time.

Slide Over (iPad only, but conceptually useful): On an iPad, you can have ShowPro open in full screen and slide over a small window of another app for quick reference.

Using the iOS Share Sheet to Quickly Open Log Files

Many apps on iOS (email clients, chat apps, cloud storage apps) integrate with the Share Sheet.

Receive a Log File: Imagine you receive a .log file in an email.

Tap and Hold: Tap and hold the attachment.

Choose 'Share': Select the "Share" option.

Select Safari: Look for the Safari icon (you might need to tap "More" and enable it).

Open with ShowPro: While Safari doesn't directly "open with" a specific web page, you can save the file to "On My iPhone" or iCloud Drive, then navigate to ShowPro's tool in Safari and load it from there. For direct web links to logs, Safari will download them, then you can follow the "Choose File" steps.

Integrating with Other ShowPro Tools

ShowPro offers a suite of client-side tools that can complement your log analysis:

[JSON Formatter & Validator](https://showprosoftware.com/tools/json-formatter): If your log entries contain JSON payloads (e.g., API responses, event data), copy a JSON string from the Log File Analyzer, paste it into the JSON Formatter, and instantly get a readable, validated, pretty-printed output. This is invaluable for deciphering complex data structures adhering to RFC 8259.

[Code Line Counter](https://showprosoftware.com/tools/code-line-counter): Want to quickly gauge the volume of your log file or a filtered section? Copy the text from the analyzer, paste it into the Code Line Counter, and get an instant count of lines, words, and characters. This helps in understanding log verbosity.

[Base64 Encoder & Decoder](https://showprosoftware.com/tools/base64-encoder-decoder): If your logs contain Base64 encoded data (e.g., images, encrypted strings, JWT tokens), copy the encoded string, paste it into the Base64 Decoder, and reveal the original content. This is particularly useful for debugging JWT RFC 7519 tokens often found in authentication logs.

[Word & Character Counter](https://showprosoftware.com/tools/word-counter): Similar to the Line Counter, this tool gives quick statistics on any text snippet from your logs.

Browser Performance Considerations for Large Log Files

While ShowPro leverages WebAssembly for efficiency, analyzing very large log files (hundreds of MBs or even GBs) on an iPhone requires some consideration:

Device Specifications: Newer iPhones with more RAM and faster processors will naturally handle larger files more smoothly.

Browser Memory Limits: Safari, like any browser, has memory limits. Extremely large files might push these limits.

Tips for Efficiency:

* Close Other Tabs/Apps: Free up RAM by closing unnecessary browser tabs and background apps.

* Pre-Filter (if possible): If you can, extract smaller, more relevant sections of a massive log file on a desktop before transferring it to your iPhone.

* Focus Your Search: Use specific, targeted searches and regex patterns to quickly narrow down the data you're interested in, rather than scrolling through everything.

* Patience: For multi-hundred-megabyte files, initial loading and complex regex searches might take a few seconds.

Customizing Search Parameters and Filters for Recurring Analysis Tasks

For tasks you perform frequently, remember your common search queries and regex patterns. You can even save these as notes on your iPhone for quick recall. The tool remembers your last settings (like regex mode) within the current session, streamlining repeated analysis.

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ShowPro's Unmatched Advantage: Privacy & Performance on iOS

When it comes to analyzing log files on your iPhone, ShowPro stands in a league of its own, primarily due to its unwavering commitment to privacy and its superior performance model.

Deep Dive into Client-Side Processing on Safari

The core of ShowPro's Log File Analyzer is its client-side processing architecture. This means:

Files Never Leave Your iPhone Browser: This isn't just a marketing slogan; it's a fundamental design principle. When you select a log file using the iOS file picker, Safari (and thus ShowPro's tool) accesses that file *locally*. All parsing, searching, filtering, and rendering operations are performed by the JavaScript engine and WebAssembly modules running within your iPhone's Safari browser. Your log data is never transmitted to ShowPro's servers, or any server for that matter.

WebAssembly (Wasm): This binary instruction format for a stack-based virtual machine allows us to run high-performance code, often compiled from languages like C++ or Rust, directly in the browser. This is why ShowPro can handle large files and complex regex patterns with speeds comparable to native desktop applications, even on mobile.

JavaScript & Canvas API: The tool leverages modern JavaScript features and potentially the Canvas API for efficient rendering of large text outputs. Instead of manipulating thousands of individual DOM elements (which can be slow), Canvas allows for drawing text directly onto a graphic surface, ensuring a smooth user experience even with extensive log data.

SHA-256 SubtleCrypto Web API: For any internal integrity checks or hashing operations (though not directly exposed to the user for log content), ShowPro could leverage browser-native Web APIs like SubtleCrypto for cryptographic functions, further ensuring security without relying on server-side processing for sensitive operations.

The Critical Security Implications: "Files Never Leave Your Browser"

This privacy model is paramount, especially for sensitive mobile data:

GDPR Compliance: For users in the EU, processing personal data (which logs often contain) requires strict adherence to GDPR. By keeping data entirely on your device, ShowPro sidesteps the need for explicit consent for data transfer or complex data processing agreements.

HIPAA Compliance: In healthcare, patient data in logs is protected under HIPAA. ShowPro's model ensures no Protected Health Information (PHI) is ever exposed to a third-party server.

CCPA Compliance: For Californian residents, CCPA protects personal information. Again, by keeping data local, ShowPro eliminates the risk of non-compliance related to data transfer or storage.

Company Policy Adherence: Many organizations have strict policies against uploading proprietary or sensitive log data to external, untrusted services. ShowPro provides a compliant solution.

Direct Comparison with Typical App Store Log Viewers

Let's revisit why ShowPro's browser-based log file analyzer iphone experience outshines its App Store counterparts:

| Feature/Aspect | ShowPro Log File Analyzer (Browser) | Typical App Store Log Viewer App |

| :------------------ | :---------------------------------------------------------------- | :------------------------------------------------------------------------ |

| Privacy | 100% Client-Side. Files never leave your iPhone browser. No uploads, no data collection. | Often requires file uploads to server for processing, compromising privacy. |

| Storage | No app installation required. Zero storage footprint on your device. | Requires app installation, consuming valuable iPhone storage. |

| Cost | Completely Free. No subscriptions, no hidden fees, no watermarks. | Many "free" apps have restrictive limits, watermarks, or require subscriptions. |

| Setup | Instant access via Safari URL. | Download, install, grant permissions, potentially create an account. |

| Security Risk | Minimal, as code runs in browser sandbox. No external server exposure. | Potential security risks from unknown app developers, server breaches. |

| Updates | Always up-to-date automatically when you visit the page. | Requires manual App Store updates. |

| Portability | Works across any modern browser/device (iPhone, iPad, desktop). | Tied to the specific iOS app installation. |

Experience the Speed and Responsiveness

Because processing happens locally, you experience:

Instant Feedback: Searches and filters apply almost instantaneously, without waiting for server round-trips.

Offline Capability (Post-Load): While an initial internet connection is needed to load the tool, once loaded, the core analysis engine can function offline, allowing you to analyze downloaded logs even without a signal.

Consistent Performance: Performance is dependent on your device's capabilities, not on network latency or server load.

No Watermarks, No File Size Limits, and Always Free

ShowPro believes powerful tools should be accessible. Our Log File Analyzer offers:

Unlimited Use: Analyze as many files as you need, as often as you like.

No File Size Restrictions: While device memory is a factor, we don't impose artificial limits on file size.

Full Feature Set: All advanced filtering, regex, and search capabilities are available without upgrade prompts.

Always Free: We are committed to providing this valuable tool to the community without cost.

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FAQ: Log File Analyzer iPhone Specific Questions

Q: Can I analyze large log files on my iPhone using ShowPro?

A: Yes, ShowPro leverages WebAssembly for efficient client-side processing. While performance depends on your iPhone's specs and available browser memory, it handles surprisingly large files (up to several hundred MBs, sometimes more) without requiring any uploads. For optimal performance with very large files, ensure you have sufficient free RAM on your iPhone by closing other apps.

Q: How do I get log files from my Mac to my iPhone for analysis?

A: You have several convenient options:

AirDrop: The quickest way for nearby devices.

iCloud Drive: Save to iCloud Drive on your Mac, and it will sync to your iPhone's Files app.

Email: Send the file as an attachment to yourself.

Direct Safari Downloads: If the log file is hosted online (e.g., on a server), you can simply open the URL in Safari on your iPhone to download it.

The iOS Files app will then make these files accessible to ShowPro's Log File Analyzer.

Q: Does ShowPro's Log File Analyzer work offline on iPhone?

A: An initial internet connection is needed to load the tool's code into your Safari browser. Once loaded, the core analysis engine can function offline, allowing you to process log files that are already downloaded to your device, without needing a continuous internet connection.

Q: Is my log data safe when using ShowPro on iOS?

A: Absolutely. Your log files never leave your iPhone's browser. All processing happens 100% client-side, ensuring maximum privacy and security. This design principle means ShowPro is inherently compliant with strict data protection regulations like GDPR, HIPAA, and CCPA, as your sensitive data remains entirely on your device.

Q: Can I filter logs by specific keywords on my iPhone?

A: Yes, the tool provides robust search and filtering capabilities. You can search for exact keywords, toggle case sensitivity, and even use powerful regular expressions to pinpoint specific events or patterns within your log data on iOS.

Q: What iOS versions are supported for the Log File Analyzer?

A: ShowPro is designed to work on modern iOS versions, generally iOS 15.0 and above, to ensure full compatibility with WebAssembly and the latest Safari browser features for optimal performance and Files app integration. We recommend keeping your iOS and Safari browser updated for the best experience.

Q: How do I save the analyzed log data from my iPhone?

A: After filtering or processing your log file, you can download the modified log content directly back to your iPhone's "Downloads" folder within the Files app. From there, you can easily share it via the iOS Share Sheet (e.g., email, AirDrop) or save it to another cloud service.

Q: Can I use this tool on my iPad too?

A: Yes, ShowPro's Log File Analyzer is fully compatible with iPadOS. It offers the same client-side processing, privacy, and features, often enhanced by the iPad's larger screen for better viewing and multitasking capabilities like Split View.

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With ShowPro's Log File Analyzer, the days of struggling to analyze logs on your iPhone are over. Embrace the power of secure, client-side processing and gain immediate insights from your mobile device, wherever you are. Visit [showprosoftware.com/tools/log-file-analyzer](https://showprosoftware.com/tools/log-file-analyzer) on your iPhone's Safari browser today!