iSyslog vs JavaScript Editor
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
iSyslog
This utility app helps you monitor and analyze system logs on your iPhone or iPad. It visualizes hidden messages from apps and processes, aiding in the detection and reporting of crashes and bugs.
- Display all log messages
- Organized and comprehensible interface
- Filter processes and messages
- Graphical log statistics
- Share logs
- Detect crashes and issues
- Analyze system state
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iSyslog opens log sessions shared from apps built with iSyslogKit, the free, open-source in-app log console for iOS developers. When a tester runs into a bug, they tap Share in the app's log console and send the session by AirDrop, Mail or Messages. Open it in iSyslog and see exactly what happened: every message with its severity, subsystem and category, plus the app build, device and OS it came from. FEATURES ⢠A built-in guide to using iSyslog and adding iSyslogKit to your app" ⢠Severity at a glance: a chart and counts for faults, errors, notices, info and debug messages ⢠Zero in on problems: show only errors and faults with one tap ⢠Search across messages, subsystems and categories ⢠Filter by subsystem, and hide Apple framework messages ⢠Session info: app version and build, device model, OS version and time span ⢠A library of every session you've received ⢠Designed for iPhone, iPad and iPhone Duo, in light and Dark Mode ⢠Includes a sample session, so you can explore right away FOR DEVELOPERS Add iSyslogKit to your app with Swift Package Manager: github.com/nyisztor/iSyslogKit. It captures your app's Logger and os_log messages and print output in Debug and TestFlight builds, gives testers an in-app log console, and lets them share sessions with one tap. It uses public APIs only, and captures nothing in App Store builds by default. PRIVACY iSyslog doesn't collect any data. Sessions you open stay on your device until you delete them.
JavaScript Editor
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Write JavaScript, TypeScript and React on your iPhone or iPad. A real code editor with a console, a live React preview, npm packages, multi-file projects, and one tap to put your work on the web. JavaScript Editor is a pocket JavaScript playground for web developers, students and anyone preparing for a coding interview. Your code runs on your device the moment you tap Run. WHAT YOU CAN DO ⢠Run JavaScript and read logs, warnings and errors in the console ⢠Write React components with JSX and watch them render in a live preview ⢠Write TypeScript and TSX; types are stripped before your code runs ⢠Import npm packages with a normal import statement ⢠Split a project across files and folders and import between them ⢠Publish a project to a link that opens in any browser ⢠Open .js and .jsx files, and save your work, with the Files app REACT PREVIEW Tap Run and your component mounts in a preview pane below the editor. Edit its CSS in one tap, or go fullscreen to see the result on the whole screen. TYPESCRIPT Turn on TypeScript and use interfaces, generics and typed props. Your code runs straight away, with no build step. NPM PACKAGES Import a package by name and it resolves when you run. No terminal, no install, no config file. PUBLISH TO THE WEB Turn a project into a link and send it to anyone. Imports, npm packages and TypeScript all work exactly as they do in the app. Publish again and the same link shows the new version. Take a page down whenever you like. A CODE EDITOR BUILT FOR A SMALL SCREEN Syntax highlighting, a symbols bar for the punctuation you would otherwise hunt for, a React hooks bar, find and replace, word wrap, undo history, adjustable font size and a set of editor themes. CONSOLE AND DEBUGGING Colour-coded log, info, warn and error lines with timestamps. Runtime errors show up in the console so you can find the line that broke. EXAMPLES More than 40 JavaScript and React examples: arrays, async and await, closures, classes, fetch, hooks, state, forms, lists and visual effects. WHO IT IS FOR ⢠Web developers sketching a component away from their laptop ⢠Students learning JavaScript, TypeScript, React or the DOM ⢠Interview candidates practising algorithms in real JavaScript ⢠Self-taught coders following a tutorial on the go FREE, WITH AN OPTIONAL PRO UPGRADE The editor, console, React preview and examples are free. Pro removes ads and unlocks multi-file projects, TypeScript, publishing, editor themes, custom snippets, find and replace and one-tap formatting. No account or sign-in needed. Available in 16 languages. SUBSCRIPTION AND PRICING ⢠JavaScript Editor Pro Lifetime ā $19.99, one payment ⢠JavaScript Editor Pro Monthly ā $1.99 per month, renews automatically ⢠Payment is charged to your Apple Account at confirmation of purchase ⢠A subscription renews unless it is cancelled at least 24 hours before the end of the current period ⢠Manage or cancel anytime in your Apple Account settings Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://cosmovex.web.app/apps/jsvedit/privacy-policy
Screenshots
Verdict
The clearest difference is in-app purchases: iSyslog at none against JavaScript Editor's 8. iSyslog also leads on ads (none vs shown). JavaScript Editor's advantage is chart position (#139 vs unranked) and iOS requirement (15.0 vs 17.0). On price, update cadence and device support there is nothing between them.
Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS
Both are free to download. JavaScript Editor sells 8 in-app purchases, starting at $1.99 per month. iSyslog asks for nothing beyond the download.
iSyslog ships an update every 3 weeks, JavaScript Editor fortnightly. Both last shipped on November 6, 2026.
| Parameter | iSyslog | JavaScript Editor |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 50.0% of reviews | ā |
| Update frequency | Every 3 weeks | Fortnightly ā better |
| Ads | No ā better | Yes |
| In-app purchases | No ā better | Yes |
| Monetization | Free | ā |
| Best chart rank | ā | #139 ā better |
| Devices | iPhone, iPad | iPhone, iPad, iPod ā better |
| Requires iOS | 17.0 | 15.0 ā better |
| Further details ā not scored | ||
| Size | 6 MB | 51 MB |
| Age rating | 4+ | 17+ |
| Developer | Karoly Nyisztor | Sahana A S |
In-app purchases
iSyslog
No in-app purchases
JavaScript Editor
- JavaScript Editor Pro Monthly$1.991 Month
- Pro Lifetime Limited Offer$5.99
- Pro Lifetime Limited Offer$7.99
- Pro Lifetime Limited Offer$9.99
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- Pro Lifetime Limited Offer$11.99
- Pro Lifetime Limited Offer$13.99
- Pro Lifetime Limited Offer$15.99
- JavaScript Editor Pro Lifetime$19.99





