JSON Master vs Robot Eyes
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
JSON Master
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JSON Master is a fast, native JSON editor for iPhone, iPad and Mac, built around what you do with JSON all day: find a value, copy its path, copy a branch, and understand what a field really contains. The document is shown two ways ā as a tree and as highlighted source ā and both are the same file. The tree is for reading and restructuring, the source for fixing what does not parse. FIND YOUR WAY ⢠Command palette (āK): every command by name and a fuzzy jump to any node ⢠Breadcrumbs, plus back and forward after every jump ⢠Search over keys and values; matching branches open by themselves ⢠Full keyboard control on Mac and iPad READ ⢠A tree with type badges, item counts, indent guides and previews of collapsed objects ⢠Highlighted source that keeps working even when the file does not parse ⢠A broken file explains itself: the exact line and column, one tap away ⢠One-tap repair for almost-JSON: comments, trailing commas, single quotes ⢠Large files open in the background without freezing COPY ⢠Paths in six notations: dot, JSONPath, brackets, jq, Swift and JSON Pointer ⢠Values, whole branches (formatted or minified), keys and key-value pairs UNDERSTAND The inspector recognises Unix timestamps, JWT tokens, base64, ISO 8601 dates, URLs and integers too large for JavaScript ā and shows what they mean. TOOLS ⢠Format, minify, sort keys, unwrap JSON embedded in strings ⢠Export as JSON or minified JSON JSON MASTER PRO One in-app purchase, no subscription, for iPhone, iPad and Mac: ⢠JSONPath queries with results as you type ⢠Structural compare: reordered keys and reindentation are not differences ⢠Generate Swift Codable, TypeScript interfaces or JSON Schema ⢠A summary that flags duplicate keys, unsafe integers and JSON hidden in strings ⢠Export as CSV ⢠Graphite and Amber CRT themes EVERYWHERE ⢠Tree and source side by side on Mac and iPad ⢠Midnight and Daylight themes, plus Graphite and Amber CRT with Pro ⢠Seven languages: English, German, French, Ukrainian, Spanish, Japanese and Portuguese. The app follows your system language or the one you choose for it No account, no ads, no tracking. Privacy Policy: https://vybgss.github.io/json-master-docs/privacy-policy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Robot Eyes
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Give any robot eyes with the iPhone you already have. Robot Eyes turns an iPhone Pro into a robot's camera and a dataset recorder at the same time, from one camera session, so the live stream and the saved recording share one clock and one frame counter. RECORD ⢠Color video (HEVC), LiDAR depth and confidence maps, accelerometer and gyroscope, and the camera's position and orientation from ARKit, with per-frame camera intrinsics. ⢠The open Stray Scanner dataset layout, readable by existing tools, plus a session.json that summarizes rates, thermal state, battery and completeness. ⢠Crash-safe fragmented video, a clear Complete / Incomplete state for every session, Keep pins, bulk Select ⸠Delete, and Share with real progress and a Cancel that works. STREAM ⢠Live camera over the USB cable in the Mobcam wire format (the one Moblin uses), with configurable stream size and rate. Thermal state is reported; it does not automatically change capture or stream settings. ⢠A once-a-second status message: frame rates, thermal, battery, free storage, camera tilt, and optionally the camera's position, heading and speed at 5 to 15 Hz. ⢠A small HTTP file server for the measurement files, so a computer can grade a run seconds after it ends. ⢠Your computer may start and stop recordings, if you allow it. ⢠A ROS 2 camera adapter (Humble and Jazzy) publishes Image and CameraInfo, with checkerboard calibration support. ⢠Wi-Fi is off by default. Turn it on and receivers must present the access token shown in Settings. MADE FOR THE BENCH ⢠Every screen carries a one-word label, so "be on the Record view" is a checkable instruction. ⢠A heads-up display in words, not icons: what the stream is doing, what the disk is doing, what to do next. ⢠Presets for a general recorder and for the Robo Bump Truck, the RC truck this app was built to drive. PRIVACY ⢠No account, no analytics and no ads. Nothing leaves the phone unless you connect a receiver or tap Share. Support: rooneytech.pages.dev/robot-eyes REQUIRES ⢠An iPhone with a LiDAR scanner (iPhone 12 Pro and later Pro models) and iOS 18.6 or newer. Robot Eyes is built on the open-source Stray Scanner recorder (MIT). ROS adapter and interface: github.com/12mv2/robo-bump-truck-ros
Screenshots
Verdict
The clearest difference is in-app purchases: Robot Eyes at none against JSON Master's 1. JSON Master's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement 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. JSON Master sells 1 one-off in-app purchase. Robot Eyes asks for nothing beyond the download.
JSON Master ships an update every 8 days, Robot Eyes fortnightly. The most recent releases landed on November 10, 2026 and October 31, 2026 respectively.
| Parameter | JSON Master | Robot Eyes |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 8 days ā better | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | No ā better |
| Devices | iPhone, iPad, Mac ā better | iPhone |
| Requires iOS | 18.0 ā better | 18.6 |
| Further details ā not scored | ||
| Size | 5 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | Volodymyr Sichka | Colin Rooney |
In-app purchases
JSON Master
- JSON Master Pro$1.99
Robot Eyes
No in-app purchases








