Jev-phone: drive phones with Jev, a model that never writes a word
MIT-licensed demo where TypeSafe's Jev (System One) picks each phone action directly from the UI tree and the phone-use SDK executes it on an iOS Simulator or Android device.
Why it matters
No text generation in the loop: a typed decision model chooses taps while a small LLM only types when text is needed — a genuinely new pattern for mobile agents.
What you could build with it
Point Jev-phone at a banking or government app to record repeatable flows (bill pay, form filing) as verified, re-runnable action scripts.
Does it hold up?
Too early to judge — launched today with recorded-speed demos (16.5s Maps directions, 28.4s Wikipedia save); real-world robustness across messy apps is untested.
Built with Jev-phone
- Show HN launch discussionHacker News · Launch-day discussion of Jev as a phone-driving decision layer; the repo ships a montage gif of timed runs (Maps directions in 16.5s, Wikipedia save in 28.4s, contact creation in 32.1s).
- Jev Against a Cross-Encoder: Jev in productiongetunblocked · Independent production writeup comparing Jev against a cross-encoder for retrieval decisions — evidence the same Jev decision layer works in real workloads.
- Rajmeet/jev-phonegithub · 1 ★ · Bun runtime, CI, MIT license; Jev picks each action from screen elements, @phone-use/sdk executes on iOS Simulator, Android, or cloud phones.
Learn more
First spotted on github: source.
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