Build small tools,
ship them well.

yatyapp is the home of a solo developer's apps. We only build small tools that solve one concrete problem: open and use, data stays on your device, no sign-up required.

./list-products mailto --dev

yatyapp@home: ~/apps

$ ls -l ~/apps drwxr-xr-x android soundmeter/ # Decibel Meter: live noise level + dB camera drwxr-xr-x android timestamp/ # TimeStamp Camera: time & place watermarks + work collages $ cat ~/apps/*/manifest | grep -E "server|account" own_server = none # no server that collects user data account = optional # Google sign-in only to buy/restore Premium storage = local # photos, videos and records stay on device $

Products

// 2 Android apps under active maintenance

[soundmeter] v1.0.6 · Android 8.0+

Decibel Meter

Turn your phone into a sound level meter. Measure ambient noise in real time, record videos with a live dB overlay, replay every record and export it to Excel.

44.1kHz sampling, A / C weighting
dB camera: live dB, time and place on video
Tap the history chart to jump to that moment in the video
Voice-activated recording, 6 UI languages

Details -> Privacy Terms

[timestamp] v1.0 · Android 7.0+

TimeStamp Camera

Stamp time, location, weather and altitude on photos and videos as you shoot. Built for check-ins, inspections, site logs and work reports.

General / Life / Work / Inspection / Attendance templates
Watermarks burned into video in real time
Daily report collages, export as image or PDF
Built-in editor: crop, rotate, filters

Details -> Privacy Terms

Principles

// rules built into every app

local_first()

Photos, videos and measurements are stored only on your device by default. We run no backend that collects user data.

least_privilege()

Permissions are requested only when a feature needs them. Core features keep working if you deny optional ones such as location.

no_signup()

Use the apps without an account. Google sign-in is needed only to buy or restore Premium.

transparent()

Our privacy policies list permissions, third-party SDKs and data flows exactly as the code implements them.

contact.sh

Contact

zhangjunfeng020@gmail.com

Bug reports, feature ideas, privacy questions or partnerships: send the developer an email.

$ send --mail