TL;DR: A screen DVR continuously buffers the last few minutes of your screen so you can export footage after something happens — no hitting record in advance. For developers, that means intermittent bugs, one-off glitches, and accidental wins are always captured. DevCam does this on macOS, 100% locally.

Every developer has lived this moment: a bug flashes across the screen, the UI does something it absolutely should not, and by the time you think "wait, I need to capture that" — it’s gone. You try to reproduce it. It won’t happen again. Or it takes twenty minutes and three coffees to happen again, and now you’re recording your whole afternoon hoping to catch a two-second glitch.

The problem isn’t you. The problem is that screen recording is built backwards. Every tool asks you to predict the future — to hit record before the interesting thing happens. But you never know which moment is worth keeping until after it’s already passed.

That’s exactly the problem a screen DVR solves.

What a screen DVR actually is

Think about how a dash cam works. It doesn’t wait for you to anticipate a crash and press a button — it’s always recording, quietly, into a loop. When something happens, the footage is already there. You just save it.

A screen DVR brings that same model to your Mac. Instead of starting a recording, it keeps a continuous rolling buffer of the last few minutes of your screen. Nothing worth keeping? The oldest frames quietly roll off and get overwritten. The second something is worth keeping, you export it — and you get the moment that already happened, not the moment you finally remembered to capture.

This is retroactive screen recording, and once you’ve worked with it, hitting "record" feels as primitive as it actually is.

The moments you lose without one

The intermittent bug. It happens once an hour, or once a day, or only when you’re not looking. Without a buffer, your options are reproducing it on camera (good luck) or describing it from memory in the issue. With a buffer, the repro video already exists — you just export it.

The "what did I just do?" fix. You’re deep in a debugging session, you try six things, and one of them works. Which one? The last fifteen minutes of your screen know, even if you don’t.

The accidental demo. Something works beautifully on the first try and you wish you’d recorded it for the PR, the standup, or the changelog. With a screen DVR, you did record it — you just hadn’t decided to yet.

The flaky test, the race condition, the one-frame UI glitch. The whole category of problems that are trivial to fix once you can see them and nearly impossible to fix from a text description.

Why "just hit record" doesn’t work

Tools like Loom, QuickTime, and Screen Studio are excellent at what they’re for: planned recordings. Demos, tutorials, walkthroughs — moments you schedule. But bugs don’t schedule themselves, and recording your entire workday "just in case" creates a different problem: hours of footage to scrub through, gigabytes on disk, and for many of us, a privacy question about where all that footage goes.

The DVR model fixes all three at once. The buffer is bounded, so there’s nothing to scrub — just the recent past. Nothing is written permanently unless you export it. And if the tool is local-first, nothing leaves your machine at all.

How DevCam does it

DevCam is a menubar screen DVR for macOS. It keeps a rolling 15-minute buffer of your screen, always on, starting at login if you want it to.

When something worth saving happens, you export the last stretch with a click or a global shortcut — ⌘⇧S, ⌘⇧M, or ⌘⇧L for the last 30 seconds, 1 minute, or 5 minutes. The buffer is held in a fixed-size region rather than an ever-growing file, so it won’t quietly eat your disk while it runs.

And it’s 100% local: no cloud, no analytics, no accounts. Your screen never leaves your Mac.

You don’t change how you work. You just stop losing the moments that mattered.

Frequently asked questions

Is a screen DVR different from normal screen recording?
Yes. A normal recorder captures from the moment you press record forward. A screen DVR is always buffering, so you can export footage from before you decided to save anything — it works retroactively.

Doesn’t always-on recording fill up my disk?
Not if it’s done right. DevCam holds the buffer in a fixed-size region and overwrites the oldest frames continuously. Only the clips you choose to export are ever written to your clips folder.

Where do my recordings go?
Into a local folder you pick. DevCam is fully local — nothing is uploaded, and there’s no account or cloud involved.

Why would a developer use this over Loom or QuickTime?
Loom and QuickTime are great for planned recordings you start on purpose. A screen DVR is for the unplanned moments — bugs and behavior you couldn’t have known to record in advance — and it keeps everything on your machine.

Stop missing the moment. DevCam keeps the last 15 minutes of your screen ready to export — no setup, no cloud.