Screen Studio: an author-reported REA study of auto-zoom rules

Requirements & limits

• Scope: The 2026-10-13 article targets the macOS Screen Studio app’s app.asar with REA’s JavaScript application analyzer, run from the command line on the author’s Mac with a supported Node.js version and Xcode Command Line Tools; it names neither the REA nor the Screen Studio version. The author reports a 101-second run producing a 124 MB evidence file over 3,695 files, using an integrity policy that records, rather than stops on, 25 bundled native programs whose fingerprints no longer matched.
• Attribution: The relevant code was obfuscated. The author says REA’s source-recovery command was unavailable on macOS, so Claude Code wrote a separate script to make it readable; that step is the agent’s work, not REA output. The decoded code is deliberately unpublished.
• Testing evidence: From the six rules, Claude Code reportedly wrote about 1,300 lines from scratch: a Swift ScreenCaptureKit recorder that logs cursor positions separately, and a Remotion renderer. The author reports 60 fps capture without dropped frames and a 22-second clip rendered in about 50 seconds on an M4 Pro, and says a redrawn cursor overlaid on a recording of the system cursor matched in most frames, with one fast-motion frame off by a few pixels.
• Limits: The author lists gaps: no graphical editor, three cursor types, simplified motion blur, no typing zoom or click sounds, and camera and microphone code that has not been tested with a real camera; the clone is far from replacing Screen Studio. Its source is unpublished.
• License: The author says the clone uses no Screen Studio code or assets and advises reading a product’s user agreement first.

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Primary sources

1. https://x.com/i/article/2109834677343432704
2. https://x.com/HanZhang415188/status/2109843188341207283