ReplayR

Instant replay camera for coaches

Google Play iOS coming soon Free · pay once

Use case · Updated 6 August 2026

ReplayR for American football coaches

TL;DR. The snap you want to see is almost never the one you just watched. A 3-minute rolling buffer holds a whole series of downs, huddles and play clock included, so a tap after third down still gives you the first-down alignment that set the problem up. The free 90-second buffer covers a single snap with the presnap look before it. Film elevated for spacing, film at the line for technique, and save either one from the sideline with a Wear OS watch. Everything stays on the phone, and Pro is a one-time unlock rather than a seat per coach.

Why does the play clock break normal recording?

Football has a strange ratio. Live action on a snap lasts about five to eight seconds. Everything around it, breaking the huddle, the substitution, the presnap shift, the 40-second play clock, takes five to ten times longer. So a coach with a phone has two bad options: film continuously and end up scrubbing through twenty minutes of standing around to find one snap, or hit record when something looks interesting and miss the ball being snapped.

The deeper problem is that the play you want is rarely the play you are watching. A coverage bust on third and six usually starts with an alignment or a check that happened two snaps earlier. You notice the consequence. The cause is already gone.

A rolling buffer inverts that. ReplayR is always recording into memory and only writes to disk when you tell it to. Tap after the third-down conversion and the previous three minutes come back with it, first down included. You are reacting to something you have already seen, and still capturing what caused it.

That is also why the buffer length matters more than any other setting. Rules bodies such as the NFHS set the play clock at 40 seconds after most plays and 25 seconds after administrative stoppages, so three snaps of a series plus their huddles land in a two to three minute window. Set the buffer under that and the series arrives cut off at the front.

Why football coaches pick ReplayR

A series, not a snap

The 3-minute Pro buffer reaches back through the huddle and the play clock to first down. You get the sequence that produced the result, not an isolated clip of the result.

Line play at 0.25×

First step, hand placement, pad level. All of it happens inside the first second of the snap. Slow-motion playback and single-frame stepping on Pro are enough to see whether the guard's hands were late.

Save from the sideline

The phone belongs in the press box or high in the bleachers for the all-22 look. You belong on the sideline. A Wear OS Tile puts save on your wrist so nobody babysits the tripod.

No seat per coach

Free covers full capture, watch remote, review and trim. Pro is a one-time unlock, which matters for a staff of eight running varsity, JV and freshman on the same weekend.

Elevated or field level?

This is the one decision that changes what you can coach from the footage, and it is worth deciding before kickoff rather than at the coin toss. Height buys you spacing. Proximity buys you technique. A phone cannot give you both from one position, and pretending otherwise is how programs end up with film nobody watches.

Elevated, the series view

Press box, top row of the bleachers near the 50, or a tower if your field has one. At 1080p this keeps all 22 players in frame with the numbers and hashes readable, which is the only way to review coverage rotation, run fits, pass distribution and whether the backside safety actually rotated. Aim to hold from hash to hash with a little sideline on each side, and let the ball drift in frame rather than panning with it.

Field level, the technique view

Tripod on the sideline, roughly level with the ball, framed tight on the line of scrimmage. You lose the picture of the defense entirely and gain stance, first step, hand placement, pad level and leverage, which is most of what an offensive or defensive line coach is actually looking for. Keep the tripod behind the team area and out of the officials' path.

Programs with two phones run both, one elevated and one at the line, each with its own buffer. There is no syncing or pairing involved because the two are independent, and the storage cost of both is fixed by the buffer length, not by how long the game runs. If you only have one phone, go elevated. A blurry all-22 tells you more on Monday than a beautiful shot of a guard.

Distance matters less than height. Roughly 15 to 20 feet of elevation at the 50 already gives usable separation between the front seven and the secondary, which is why the top row of a small set of aluminium bleachers is often enough. If you want to work out the framing for your own field before Friday, the camera placement planner takes field width and distance and tells you what fits.

Buffer length by unit of review

Pick the shortest buffer that still contains the cause of the thing you are looking at, not just its consequence.

What you are reviewing	Buffer	What one save holds
A single snap, technique	45 s	The presnap look, the snap, the whistle
A snap in context	90 s	Huddle, motion, snap, result, and the down before
A series of downs	3 min	Three or four snaps with their play clocks, first down to punt
A full drive	6–12 min	An entire possession, including the two-minute stretch

45 s and 90 s are free. The 3, 6 and 12-minute buffers require the one-time Pro unlock. Reasoning across every sport lives in optimal replay delay by sport.

A typical game-day workflow

Pre-game. Tripod in the press box or the top bleacher row near the 50. Buffer 3 min for series review, 90 s if you are chasing individual snaps. 1080p, not 4K, because you want hours of capture and a file a phone can actually trim. Stealth mode on, power bank connected.
Kickoff. Tap Start on the watch and walk to the sideline. Nothing else touches the phone until halftime.
During the drive. Tap at the end of each series, plus after any explosive play, turnover, red-zone snap or penalty you want the alignment for. The buffer reaches back through the huddles to the start of the series.
Between quarters. Leave it running. There is nothing to reset, and the buffer costs the same storage whether you save six clips or sixty.
Halftime. Pull the two or three series you want to correct, review at 0.25× with the unit, and leave the rest for Monday. Halftime is twelve to twenty minutes and mostly belongs to adjustments, not film.
Final whistle. End the session on the watch, then swipe through what you saved and delete the noise while it is still fresh.
Post-game. Trim each series to the snaps that matter and send them to the position coach who needs them. The files are ordinary MP4s, so they upload to whatever breakdown platform the program already uses.

What to save, what to skip

Save

Every third-down snap, with the two downs that set it up
Explosive plays given up, whole series
Red-zone and goal-line snaps in both directions
Turnovers and the possession that produced them
Any snap where the defense checked and the offense checked back
Special teams: punt protection, kick coverage lanes, the first return of each half
Presnap penalties, which are almost always an alignment or a cadence problem you can see

Skip

Kneel-downs and clock-killing snaps
Extra points that went exactly as practised
Injury stoppages, timeouts and TV breaks
Routine three-yard runs on first down with no read worth showing
Anything the position group would not sit through on Monday

What changes across a series

The snap that caused the problem and the snap where it shows up are usually a minute or two apart, which is exactly what a record button cannot handle.

On the sideline	Record-button filming	ReplayR
Reaching back to first down	You start filming on third down, the alignment on first is gone	A 3-minute buffer holds the whole series, huddles included
Dead time between snaps	Forty seconds of standing around recorded for every five of football	Only what you save is written, so the gallery is snaps, not filler
Filming from the press box	Someone has to stay with the phone to work it	The phone films elevated, you save from the sideline by watch
Storage over four quarters	Grows with every minute the camera runs	Buffer cost is fixed, only deliberate saves add up
Cost per staff	Per-coach seats renewed each season	One-time unlock, no seats to manage across three levels

Practice is where it pays off

Friday gets the attention, but the buffer earns its keep on a Tuesday. Practice periods are short, repetitive and scripted, which is the ideal shape for a rolling buffer: you know a rep is coming, you do not know which rep will be the one worth showing.

Individual and install periods

45 seconds is plenty. One rep, one correction, shown to the player before the next one so the feedback lands while the movement is still in their body rather than three days later on a laptop.

7-on-7 and team period

90 seconds to 3 minutes. A scripted sequence of plays runs like a series, and the coaching point is often the check that preceded the rep, not the rep itself.

Special teams walk-through

Film elevated. Punt protection and coverage lanes are spacing problems, and they are almost invisible from field level. One save per unit per practice is usually enough.

Scrimmages

Treat it as a game. Same tripod, same 3-minute buffer, same save discipline. The difference is you can stop the drill and show the clip immediately.

One caution about immediate feedback: it works because it is short. A twenty-second clip and one cue changes the next rep. A four-minute breakdown in the middle of practice costs you three reps and the players' attention. Save generously, show sparingly.

Filming young players, and the rules around it

Youth and high school football carries the same safeguarding questions as any sport with minors on the field, with the extra complication that footage often gets shared widely for recruiting. ReplayR keeps everything on the device: there is no account, no upload, and no copy of a fourteen-year-old's practice film sitting on a server you do not control. What leaves the phone leaves because you shared it deliberately.

Rules on in-game technology are a separate matter and they genuinely vary. The NFHS, individual state associations, NCAA divisions and youth leagues each set their own terms for where devices may be used and what may be shown to players during a contest. Read your own rulebook before you build a halftime routine around video. Post-game and practice review is uncontroversial nearly everywhere. Live sideline review is not.

Field access is worth a word too. Many venues restrict who may film from the sideline, and a tripod in the team area is a trip hazard the officials will notice. Elevated positions sidestep both problems, which is another argument for the press box if you have one. More on the connectivity side in filming and reviewing with no signal, which is the normal state of affairs at a rural stadium on a Friday night.

FAQ

How long should the buffer be for American football?

Three minutes on Pro is the useful default, because it holds a full series of downs rather than a single play. Live action lasts five to eight seconds, but the play clock and the huddle stretch three snaps out to roughly two minutes of real time, and the thing you usually want to see is the alignment two plays earlier rather than the tackle you just watched. If you only review individual snaps, the free 90-second buffer covers a play plus the huddle and the presnap look before it.

Where should the phone go, sideline or elevated?

Elevated wins for anything involving spacing. From a press box, a bleacher row near the 50, or a tower, a phone at 1080p keeps all 22 players in frame between the hashes and the numbers, which is what you need to coach coverage rotation, run fits and pass distribution. Sideline height at field level is fine for line play, stance, hand placement and pad level, and useless for reading a defense. Many programs run both: an elevated phone on a tripod for the series view and a second phone at the line of scrimmage for technique.

Can I save a play without leaving the sideline?

Yes, that is what the Wear OS Tile is for. The phone films from the stand or the press box, you stay on the sideline with the unit, and a tap on the watch writes the last N seconds to the phone's storage. Nobody has to climb down between series, and no assistant is tied to the tripod for four quarters.

Is ReplayR a replacement for Hudl?

No, and it is not trying to be. Hudl is a season-long film library with breakdown, tagging and sharing across a staff. ReplayR is the capture step: it makes sure the snap you wanted exists as a file, on the sideline, within seconds of the whistle. Saved clips are ordinary MP4 files in your gallery, so uploading them into whatever breakdown platform your program already pays for is a normal workflow. Frame-level work happens in the Pro frame-by-frame analyzer, and you can draw on a saved frame to mark a gap or an angle.

Can I show a player video during the game?

That depends on your governing body, not on the app. Rules on in-game video and on where technology may be used differ between the NFHS, individual state associations, NCAA divisions and youth leagues, and several restrict what may be shown to players between series. Check your own rulebook before you build a workflow around it. Filming for post-game review is uncontroversial almost everywhere; live sideline review is not.

Will a whole game fit on the phone?

The buffer itself uses a fixed amount of storage no matter how long the game runs, because it overwrites itself continuously. Only what you deliberately save takes space, so a game where you keep 40 series at 3 minutes each is far smaller than filming four quarters end to end. Bring a power bank, though. Continuous capture for two and a half hours will empty most phones. The storage and buffer calculator gives the numbers for your resolution.