TL;DR. These are two different machines. Delay Camera shows you a live feed running 1 to 300 seconds behind, so you finish a rep, turn around, and watch it play by itself. ReplayR shows you nothing until you ask: it keeps a rolling buffer and writes a clip when you tap, press your watch, or hold up a palm. Delay wins for a fixed drill station where the athlete turns and looks. Buffer wins for a session where you keep the good moments and throw the rest away.
| Feature | ReplayR | Delay Camera |
|---|---|---|
| Model | Rolling buffer, saved on trigger | Delayed live feed, plays automatically |
| Lookback range | 45 s or 90 s free, 3/6/12 min Pro | 1–300 s delay |
| Needs a trigger | Yes, that is the point | No, the feed just runs behind |
| Save from a smartwatch | Yes, Wear OS app, Tile and Complication | No |
| Hand-gesture save | Yes, open palm (Pro) | No |
| Slow motion | Playback down to 0.25× | 1/2× and 1/10× |
| Still capture | No | Yes |
| Saved output | MP4, trimmed, after a keep/toss pass | MP4 export from the delayed feed |
| Screen must be visible | No, stealth mode blacks it out | Yes, the screen is the product |
| Pricing | Free + one-time $5.49 Pro unlock | Free, with in-app purchase |
| Platforms | Android + Wear OS (iOS in progress) | Android |
Delay Camera figures from its Google Play listing (package com.kohshin.delaycamera, developer onsight, version 2.51, updated 22 July 2026, 50,000+ installs, 4 GB RAM recommended). Last verified 2026-07-28.
A delayed mirror is a loop with a lag. Point the phone at the bay, set 8 seconds, hit a golf ball, turn around, and the swing plays on screen without anyone touching anything. Nobody presses a button, nobody misses a rep, and the feedback arrives inside the window where the athlete still remembers the feel.
A rolling buffer keeps the last N seconds in memory and discards the rest. Nothing plays until you say so, and only the moments you save reach the disk. That fits a match, a sparring round, or a two-hour practice where 95 percent of the footage is worth nothing.
The failure modes are opposite. A delayed mirror needs the athlete to turn and look, and it needs a screen they can see, which rules out bright sun and any distance past a few metres. A buffer needs someone to trigger it, which is exactly why ReplayR puts the trigger on a watch and on a palm gesture.
Delay Camera is a good drill-station app. It is free, it has been maintained (version 2.51 shipped in July 2026), the delay range of 1 to 300 seconds covers everything from a golf swing to a full gymnastics routine, and 1/10× slow motion is slower than what ReplayR offers on playback. If your setup is a phone on a stand two metres from a lifter, that is a solid choice.
ReplayR is a session app. The buffer runs while you coach, saves happen from the touchline or the mat edge, and the swipe pass at the end leaves you with a folder of keepers rather than a delayed feed you never captured. Stealth mode blacks the screen out so the phone can buffer for two hours without cooking its battery.
They cost nothing to combine. Put an old phone on a stand as a delayed mirror for the athlete to self-correct, and keep your own phone or a second device on ReplayR to capture the reps worth keeping and reviewing later. The mirror handles the immediate feel, the buffer handles the record.
If you only want one, the question is simple: does the athlete turn around and look at a screen, or do you want a folder of clips at the end? The first is a mirror, the second is a buffer.
A delay camera shows a live feed running a set number of seconds behind, so a rep plays back automatically once you turn around. A rolling buffer keeps the last N seconds in memory and only writes a file when you trigger a save. Delay is for self-correction at a station; a buffer is for keeping the moments worth keeping across a whole session.
Yes, with an in-app purchase. It is on version 2.51 as of 22 July 2026, has 50,000+ installs, and the developer recommends at least 4 GB of RAM. ReplayR is free with a one-time $5.49 Pro unlock.
Not as a continuous feed. ReplayR saves on a trigger and then plays the clip back. If your athletes rely on turning around to a screen after every rep, a dedicated delay app fits better, and the two run happily on separate devices.
For a squat rack with the phone two metres away, a delayed mirror is hard to beat. For a session where you want the working sets saved and reviewed later, ReplayR with a 12 to 15 second clip and a watch save is the cleaner fit.
One-time Pro unlock if you want longer buffers, hand-gesture save, and 8K capture. No subscription.
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