2026Live & in use

Focus Modes

iPhone-style Focus modes for Android 15+. Each mode is a real system Do Not Disturb rule, switched from a Quick Settings tile, a widget or a schedule.

Role: Sole developer, building with Claude Code as a pair — feasibility research, zen-rule engine, Quick Settings tile, widget, schedules, and release
Stack: Kotlin
Jetpack Compose
Glance
Room
DataStore
AutomaticZenRule

Open live product View source on GitHub

Focus Modes main screen with Work, Sleep and Personal modes and the Quick Settings tile options — Screenshots show the real software. Any names, plans or workout history in them are locally seeded demo data, never real customer data.

Status

Live: a signed v1.0.0 APK on GitHub Releases, for Android 15 and later.

Decisions

Two throwaway diagnostic apps first

Before any product code, two diagnostic apps measured the platform on Xiaomi HyperOS: about 2 ms to flip the tile and about 36 ms to apply a rule.

One idempotent reconciliation loop

A single idempotent ModeEngine reconciliation loop, plus explicit state for the manual-dismissal window, instead of event-driven toggles.

No internet, accessibility or contacts permissions

The app requests zero INTERNET, accessibility or contacts permissions.

What it cost

Diagnostic apps: two discarded apps, and honest platform limits — starred contacts instead of per-contact allowlists.
Reconciliation loop: every user-intent rule must be modelled as explicit state.
Minimal permissions: no crash telemetry and no usage analytics.

Screenshots

Edit mode screen for the Work mode with name, icon, colour and who gets through — The mode editor: icon, colour, and which calls and messages get through.

Mode settings with screen effects and an every-day schedule from 23:00 to 07:00 — Per-mode screen effects and schedules.