Lock every iPhone in the room to ±5 ms in three seconds—no cables, no excuses. (composite view of multiple devices, see below for device screenshots)

The stopwatch that finally nails ensemble sync.

SyncTimer allows you to sync stopwatches on demand through WiFi, Bluetooth, or LAN, with powerful tools for performers, theaters, or anyone who wants to sync offstage.

Instant, reliable, precise.

Set  & Forget

Precision down to 0.01s   with programmable events. Program stop, cue, loop, and end events in advance, then walk away—SyncTimer cues each performer through visual and haptic feedback

No more awkward “ready-set-go” downbeats!

  • SyncTimer uses your local network (Wi-Fi, LAN, Bluetooth) and Apple’s Bonjour discovery to automatically find nearby devices. Simply launch the app on each device, select the same session name, and you’re instantly in perfect lockstep—no manual pairing, no cables required.

  • Whether you’re on stage, in the studio, or teaching a class, SyncTimer replaces clumsy visual count-offs, hardware click tracks, and error-prone spreadsheets. You get rock-solid, drift-corrected timing across any number of devices—so you can focus on the music, not the metronome.

  • We’ve stress-tested SyncTimer across 30+ iOS devices on congested Wi-Fi, fiber backbones, and enterprise-campus networks. Our two-state Kalman filter and outlier-gating algorithm keep your timing accurate to within 10 ms—even under heavy packet loss.

  • SyncTimer offers flexible volume licensing:

    • Single-user (App Store purchase)

    • Studio packs (5–25 seats with bulk codes)

    • Institutional (100+ seats with priority support & custom onboarding)

    Enterprise and educational customers enjoy site-wide deployment, centralized billing, and discounted multi-year agreements.

  • Right now SyncTimer focuses on device-to-device timing across iOS hardware via LAN, Wi-Fi, Bluetooth, and Bonjour. Native Mac support and external integrations (OSC bridge, REST API, DAW plugins, QLab cues) are on our roadmap and will arrive in the upcoming COMPLETE release. In the meantime you can run SyncTimer on multiple iPhones and iPads together—any deeper host-to-host or software/hardware hooks will be available soon.

Beta seats currently available: 9998*

Ready for the Stage

Stage-proven controls & safety locks.

Built for live performance: countdown lock, start/stop lock, parent/child permissions, and robust multi-device sync. All the safeguards you need for flawless shows—so you can focus on the music, not the timer.

Want to stay in the know?

Drop your email and we’ll send you a free stage sync essentials PDF sheet.

Lobby Mode...

Scale from duets to orchestras. Create multi-parent/multi-child lobbies for deep networked sync.

See every peer in your session, share master timing, and keep the whole ensemble locked together—even across multiple rooms.

...with up to 30+ devices.