Comparison
The Comparison feature lets you place two swimmers side-by-side and sync them to a common point — perfect for showing an athlete how their technique compares to a faster swimmer or their own previous best.
When to Use Comparison
- Showing a swimmer the difference between their turn and a faster swimmer’s turn
- Comparing an athlete’s technique race-to-race over a season
- Side-by-side analysis of two relay legs
- Demonstrating what a faster breakout looks like in real terms
Open a Comparison
Open your first race
Navigate to a race video on your dashboard and click View to open it.
Click Compare
In the annotation toolbar, click the Compare button (two overlapping rectangles icon). A search panel opens on the right.
Choose a second video
Search for a second race or swimmer from your library. You can filter by athlete name, date, or event.
Select the sync point
Choose a marker to sync the two videos on — typically Start or Turn 1. Both videos will snap to the same relative position at that marker.
Play
Click Play. Both videos play side-by-side, staying in sync. Use playback controls to scrub or slow down both simultaneously.
Sync Points
The sync point determines what the two videos are aligned on. Common sync points:
| Sync point | Good for |
|---|---|
| Start | Comparing full race from the block |
| Turn 1 | Isolating second lap and underwater off turns |
| Reaction | Comparing start reaction times |
| Breakout 1 | Comparing the first stroke after the dive |
For technique comparison (not race comparison), sync on Turn to focus specifically on the underwater phase. This removes variation in reaction time from the comparison.
Playback Controls in Comparison Mode
Both videos share a single playback timeline. Controls work the same as the standard annotate screen:
| Control | Action |
|---|---|
| Space | Play / Pause both |
| ← → | Step both videos one frame |
| Shift + ← → | Step both videos 10 frames |
| Drag timeline | Scrub both simultaneously |
You cannot scrub the videos independently — they are always locked to the same offset from the sync point. To view a video on its own, exit comparison mode first.
Viewing Split Differences
When both videos have markers annotated, a Δ (delta) column appears in the splits table beneath the comparison player. It shows the time difference for each split segment between the two swimmers.
| Segment | Swimmer A | Swimmer B | Δ |
|---|---|---|---|
| Start → Turn 1 | 27.22s | 26.88s | -0.34s |
| Turn 1 → Finish | 28.27s | 27.91s | -0.36s |
| Total | 55.49s | 54.79s | -0.70s |
Negative Δ means Swimmer B is faster in that segment.
Sharing a Comparison
Click Share while in comparison mode to generate a shareable link. Recipients see both videos synced at the same point — no account required to view.
Exiting Comparison
Click the X on the comparison panel, or press Escape, to return to the single-video annotate view.