SprintBell: Interval Timer

The interval timer that keeps counting — screen off, pocket, music playing.

SprintBell runs your rounds in a proper foreground service with a wake lock, so the countdown and the voice cues survive a locked screen, an app switch, and battery savers. If the system ever kills the app mid-round, SprintBell restores your exact spot the moment it comes back. No more dead timers halfway through a set.

EVERYTHING IS FREE
• Unlimited saved timers — no preset paywall
• Voice announcements AND beep cues — not premium extras
• No ads between your rounds, ever
• No subscription, no account, works fully offline

BUILT FOR REAL TRAINING
Set warm-up, work, rest, rounds and cool-down with big steppers and a live total-time readout. Save any combination as a named timer and start it with one tap. Three starters are included: a classic 20/10 x8, boxing rounds 3:00/1:00, and an every-minute-on-the-minute 60s x10.

CUES THAT RESPECT YOUR MUSIC
Phase changes are announced by voice ("Work", "Rest", "Last round") with 3-2-1 countdown beeps. Audio cues duck your music briefly and always give the volume back. Prefer beeps only, voice only, or silence? One switch in Settings.

A DISPLAY YOU CAN READ FROM THE FLOOR
Fullscreen countdown with color-coded phases — every phase readable at a glance from across the room, with round X of Y and pause, skip, and stop always one tap away.

PRIVATE BY DESIGN
SprintBell collects no data whatsoever. No analytics, no tracking, and every feature works offline — the only time the app touches the network is Google Play's own billing, and only if you choose to leave a tip.

If SprintBell earns a spot in your routine, there's an optional tip jar in Settings. Tipping is never required — every feature is already yours.

Recent changes:
Updated for Android 16 (API level 36) and the latest Google Play Billing library. Stability and compatibility improvements.