Frame-by-frame video analysis on Android

TL;DR. ReplayR Pro reviews any saved clip frame by frame. Tap Analyze on the review screen and a fullscreen player opens: step one frame forward or back, hold a step button to run a sequence, or drag across the video to scrub with frame-level precision, with a live counter showing the frame number. Playback slows to 0.1×, down from the old 0.25× floor, and the volume keys step frames so your fingers stay off the picture. Any single frame saves to your photos or shares at the clip’s full recording quality. Everything happens on the device: no upload, no account, no subscription.

Why a single frame decides it

Most coaching feedback works fine at normal speed. A handful of calls do not. Was the foot behind the line at contact? Did the bowler’s front foot land in front of the crease? Did the racquet face open before or after the ball left the strings? Those questions have one correct answer and it lives on one frame, and at 30 frames per second that frame lasts 33 milliseconds. Real-time playback cannot resolve it, and neither can 0.25× playback, because slowing a clip does not stop it.

Stepping does. The analyzer moves exactly one frame per tap and holds it still for as long as you want, so a disagreement about a line call becomes a picture two people can look at together. That is the job this feature exists for.

How to use the analyzer

01. Open a clip and tap Analyze

Any clip you kept from the swipe-to-keep queue works, and so does anything already in the ReplayR library. The Analyze button sits on the review screen. It opens a fullscreen player with a live frame counter, so you always know which frame you are looking at and can return to it later.
02. Get close to the moment

Drag across the video to scrub with frame-level precision, or set playback to 0.1× and let it run into the action. Scrubbing is faster when the moment is seconds away; slow playback is better when you are not yet sure which rep you want.
03. Step one frame at a time

Tap the step buttons to move a single frame forward or back. Hold one down to run through a sequence at a controlled pace, which is the right tool for watching a swing unfold rather than inspecting one instant of it. On Android the volume up and volume down keys do the same thing, so your hand never covers the screen, useful when the phone is on a tripod and two people are watching.
04. Keep the frame

Save the still straight to your photos at the clip’s full recording quality, or push it through the Android share sheet to WhatsApp, Signal, your team chat, or email. It is an ordinary image file, so the person receiving it needs nothing installed.
05. Mark it up if it needs explaining

A frame plus an arrow beats a frame plus a paragraph. Tap Annotate frame to draw on the still before you save or share it, then close the drawing screen and you are back on the same frame, ready to step on. Full walkthrough: draw on a video frame.

Frame rate is the real limit, not the player

Slow motion does not create detail, it only spreads existing frames over more time. A clip recorded at 30 fps contains one image every 33 ms no matter how slowly you play it; at 60 fps that becomes 17 ms, and at 120 fps, 8 ms. If the thing you are trying to see moves fast, the frame rate you recorded at decides whether the answer is in the file at all.

Capture frame rate	Time between frames	Good enough for
30 fps	33 ms	Footwork, body position, run-ups, most team-sport calls
60 fps	17 ms	Golf and tennis contact, bat path, gymnastics rotation
120 fps	8 ms	Ball compression, racquet-face angle through impact

Work out what your sport actually needs with the frame rate and slow motion calculator. Higher frame rates cost storage and light, so more is not automatically better.

Where this sits against dedicated analysis apps

ReplayR is still a capture tool first. What changed in August 2026 is that the review half no longer forces an export to a second app for the two things coaches ask for most: stepping to a frame, and drawing on it. What it still does not do is comparison and commentary.

In ReplayR Pro

Single-frame stepping, both directions, hold to run
Frame-precise scrubbing with a live frame counter
Slow motion to 0.1×
Volume-key frame stepping
Save or share any frame at full recording quality
Freehand, line and text annotation on a frame

Still elsewhere

Side-by-side or overlaid comparison of two clips
Voice-over commentary recorded onto a clip
Drawing that tracks across a moving video
Angle and distance measurement tools
A shared cloud library with athlete accounts

If you need the right-hand column, ReplayR vs OnForm lays out the trade. Saved clips are ordinary MP4 files, so running both is a normal workflow, not a workaround.

FAQ

Does ReplayR do frame-by-frame video analysis?

Yes, on Pro, since August 2026. The Analyze button on the review screen opens a fullscreen player that steps one frame at a time in either direction, runs a sequence while you hold a step button, and scrubs with frame-level precision when you drag across the video. A live counter shows which frame you are on.

How slow can ReplayR play a clip?

Down to 0.1×, a tenth of real speed. The previous floor was 0.25×. Slower playback only reveals more detail if the clip was captured at a high frame rate: a 30 fps clip at 0.1× shows the same 30 distinct images per second of action, just held for longer.

Can I export a single frame as a photo?

Yes. Save the current frame straight to your photos at the clip’s full recording quality, or send it through the standard Android share sheet. It is an ordinary image file, so the recipient needs nothing installed.

Can I step frames without touching the screen?

Yes, on Android. On the analyze screen the volume up and volume down keys move one frame at a time, so you can work through a sequence without your fingers covering the picture.

Is frame-by-frame review free?

No, it is part of the Pro unlock, which is a one-time purchase rather than a subscription. The free tier keeps the rolling buffer, swipe-to-keep review, the trim editor and the full Wear OS companion.

Does the analyzer upload anything?

No. Stepping, slow motion, frame export and annotation all run on the device. Nothing is sent anywhere unless you pick a destination in the share sheet yourself.