Eyeware Data Recorder vs JS Shell
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Eyeware Data Recorder
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Eyeware Data Recorder is an iOS app intended to be used as a data collection tool by the Eyeware team. The collected data is used to improve the eye tracking algorithms that are developed and distributed by Eyeware in their research projects and products. An example of such a product is the Eyeware Beam iOS app, which turns your iPhone into a head and eye tracking device for gamers and streamers. In this case, gamers and streamers would directly benefit from the data collected by testers using the Eyeware Data Recorder iOS app: Beam users will have a smoother and increasingly pleasant experience using their iPhone or iPad as a head and eye tracker. Eyeware Data Recorder is useful for scientific studies that will in the end increase the performance of eye tracking algorithms developed by Eyeware Tech. The app records the user’s face area while following a sequence of points appearing on the screen of the device. The user is asked to watch a set of points that will be used as ground-truth. The data, in the form of videos and non-personal metadata, will be uploaded to Eyeware’s servers, and will then be used to help improve the performance of Eyeware’s gaze tracking algorithms. All collected data is treated with the appropriate care in terms of confidentiality and security. The data is anonymized: users are asked for some personal details (name and email), but is stored on a separate server from the video data. Thus, no-one at Eyeware can have access to both the personal details and the video data. All collected data is not connected in any way to personal details of the data provider, i.e. the tester who is participating in the data collection activity. Collected data can be deleted at any moment by simply emailing us via the email address you provided for the sign up.
JS Shell
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JS Shell is a pocket-sized developer console that lets you write, run, and test web code (HTML, CSS, JavaScript) directly on iOS and macOS. No Xcode, no laptop, no remote server. Paste a page in, tap run, and it loads in a real WKWebView served from a local HTTP origin. A real secure-context origin on iOS, so modern web APIs — from WebRTC to Geolocation — behave the way they should. KEY FEATURES Local HTTP server. An in-process server bound to the loopback interface. Provides a real secure-context origin so modern Web APIs work out of the box. Not reachable from outside the device. JavaScript REPL. A full JavaScript runtime backed by JavaScriptCore. Type js to enter the REPL. console.log, fetch, setTimeout, setInterval, Promises, and async await are all available. Real Promises, real microtasks, real JSON parsing, real URL parsing. Geolocation support. Test navigator.geolocation on a real iOS device. Permissions are handled by the system, just like Safari. Useful for validating location-based web features without deploying to a server. Persistent file system. Files you paste live in your Documents directory and survive app restarts. Each downloaded package gets its own directory. iCloud backup picks them up like any other app data. SQLite key-value store. A real B-tree on disk via SQLite. Read and write from your pages with same-origin fetch. No CORS configuration required. curl. A subset of curl built on URLSession. The flags X, H, d, i, I, o, A, m, v are supported. Pretty-prints JSON responses and saves binary blobs to the virtual filesystem. Archive extraction. In-process tar, tar.gz, tgz, gz, and zip extraction. No shelling out. Download a release tarball with curl, extract it, and run it immediately. Voice commands. Tap the mic, speak a command. Apple Speech framework converts speech to text. Auto-submits on detected silence. Voice commands are saved to the scripts list for one-tap re-run. Saved scripts. Save any sequence of commands as a named script. One-tap to re-run later. Voice-recognized commands are auto-saved to the scripts list for instant replay. Mac Catalyst support. Runs natively on macOS as a Mac Catalyst app. Multi-window, resizable, fullscreen-capable. The same code that runs on your iPhone runs on your Mac. DESIGNED FOR DEVELOPERS JS Shell is a tool for people who want to test web code on a real iOS device without installing Xcode, syncing files, or setting up a tunnel. It is especially useful for: Testing geolocation, camera, and microphone permission flows on iOS. Validating fetch, CORS, and cookie behavior on a real iPhone. Building small offline web tools that need persistent state. Running JavaScript snippets without opening Safari Inspector. Debugging mobile rendering edge cases on the device itself. PRIVACY JS Shell does not collect any user data. There is no telemetry, no ads, no analytics, no third-party SDKs, no remote configuration. Everything you type, paste, or download stays on your device. The local HTTP server only listens on the loopback interface and is not reachable from any network. The app forwards camera, microphone, speech recognition, and location permissions to web pages you load, exactly like Safari does on macOS. The first time a page tries to use them, iOS shows the standard system permission prompt. The first time a page tries to use them, iOS shows the standard system permission prompt.
Screenshots
Verdict
The clearest difference is iOS requirement: Eyeware Data Recorder at 13.0 against JS Shell's 17.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | Eyeware Data Recorder | JS Shell |
|---|---|---|
| Price | Free | Free |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 6 MB |
| Age rating | 17+ | 17+ |
| Developer | Eyeware Tech SA | Jowb Inc. |
In-app purchases
Eyeware Data Recorder
No in-app purchases
JS Shell
No in-app purchases









