# SeshTimer

> SeshTimer is a tablet-first web app for swim coaches. It replaces stopwatches and clipboards with one-tap multi-lane wave starts, per-swimmer splits, offline-first timing that syncs automatically, and instant leaderboards, target-cutoff charts, public stats links, and Excel reports. It runs in any modern browser (iPad, Android tablets, Windows, macOS, ChromeOS) and can be installed as a PWA.

- Website: https://seshtimer.app/
- App (sign in / get started): https://go.seshtimer.app
- Made by: ATN (https://www.atn.hu)
- Languages: English (US, British, and Australian date and time formats) and Hungarian
- Category: sports software, swim timing, swim team training analytics

## Key facts

- Audience: club, high school, college, and masters swim coaches and their assistant coaches.
- Timing: monotonic clock with 0.01 s display precision; drift-free; START, SPLIT, FINISH, and per-swimmer Undo buttons; accidental double-tap debouncing.
- Start modes: wave start (one tap starts the next swimmer in every lane at once, even while earlier waves are still swimming) and individual start; optional countdown and start horn.
- Pools: yards and meters — 25 yd (SCY), 25 m (SCM), 50 m (LCM), and custom lengths such as 33⅓ m; exact unit conversion (1 yd = 0.9144 m); split count is derived from distance ÷ pool length.
- Sets: sets × reps × distance, including compound sets like 2 × 8 × 21 m.
- Offline: active workout state and every result are stored in a local IndexedDB queue and synced to the server automatically with idempotent UUIDs when the connection returns.
- Analytics: leaderboards, target cutoff times (general or by gender), best-time comparisons, progress-over-time charts.
- Sharing: read-only public statistics link for swimmers and parents (no login, revocable, with default theme and language).
- Teams: multiple coaches can share one team account (roster, groups, exercises, workouts, results).
- Data: JSON backup and restore, Excel export.
- Sign-in: passwordless email one-time code.
- Display: dark mode and high-contrast light mode for outdoor pools; installable on the home screen.
- Safety note: SeshTimer is a timing tool, not a lifeguarding or safety supervision system.

## How to time a practice with SeshTimer

1. Open https://go.seshtimer.app and sign in with your email one-time code.
2. Build the workout: choose the pool, the set (for example 4 × 100), and the swimmers or groups; lanes are assigned automatically.
3. Tap Start wave to send off the next swimmer in every lane (optional countdown and horn).
4. Tap Split at each wall and Finish at the end; use Undo on a single swimmer to fix mistakes.
5. Review leaderboards and target cutoffs, export to Excel, or share a public stats link.

## FAQ

- Q: What happens if the pool loses Wi-Fi mid-workout?
  A: Timing continues. Results are queued on the tablet and synced automatically when it reconnects.
- Q: Does it support both yards and meters?
  A: Yes — SCY, SCM, LCM, and custom pool lengths, with exact conversion between units.
- Q: What if I tap the wrong swimmer with wet hands?
  A: Only the large START, SPLIT, and FINISH buttons trigger timing; each swimmer has an independent Undo.
- Q: How do parents see results?
  A: Share a read-only public statistics link; no login required, revocable at any time.
- Q: Can assistant coaches use their own tablets?
  A: Yes, add their emails under Settings → Shared accounts & access to share the same team data.

## Optional

- Screenshots: https://seshtimer.app/#screenshots
- Features: https://seshtimer.app/#features
- Comparison and ROI calculator: https://seshtimer.app/#compare
- Sitemap: https://seshtimer.app/sitemap.xml