Record your entire day.
Silently. On-device.
BlackBox records continuously in the background — even with the screen off. Everything stays on your device. Browse any moment by the hour, replay it on a visual waveform, and turn it into text without a single byte leaving your phone.
No account No cloud Works offline
Records only after you tap Start. Audio stays on this iPhone unless you share it.
One tap. Then it just remembers everything.
BlackBox is engineered for all-day, non-stop background capture — packed with the tools to find, replay, transcribe and protect every moment.
Silent 24/7 background capture
Press record once and BlackBox keeps going all day — through other apps, locked screens and pockets. No tapping, no managing, just a continuous record of your life.
100% on-device
Audio never leaves your phone unless you choose to share it. No account, no servers, no cloud middleman.
On-device transcription
Turn any recording into searchable, time-stamped text — the speech model runs locally, so nothing is uploaded.
Smart schedules
Run nonstop 24×7, or only during the windows you pick — separate start/stop times for weekdays and weekends.
Visual waveform playback
Scrub, scan and skip through hours of audio on a clean waveform timeline. Find the exact second that mattered.
Day-wise hourly timeline
Every day is broken into tidy hourly files, so you can jump straight to 2 PM last Tuesday in two taps.
Daily auto-archive
Completed days are packaged automatically to keep storage tidy — no manual file wrangling.
Cloud archive backup
Optionally save finished archives straight to your chosen Files / Drive folder, automatically.
Face ID & passcode lock
Protect your library behind Face ID, Touch ID or a passcode. Your recordings are for your eyes only.
Export & share anything
Send a single clip or a multi-day archive wherever you need it — share sheet, Files, email, anywhere.
Delete on your terms
Remove a single recording or wipe an entire archived day in a tap. You decide what stays and what's gone for good.
Set it once. Forget it forever.
Tap record once
Open BlackBox, grant the mic, hit Start. That's the last button you'll touch all day.
It runs silently
BlackBox keeps recording in the background — screen off, in your pocket, while you live your day.
Browse your timeline
Each day is split into hourly files. Scroll the library and open any moment instantly.
Replay, transcribe, export
Scrub the waveform, convert speech to text on-device, then share or back up what matters.
Nothing leaves your phone.
There's no account, no sign-up and no server in the middle. Your recordings live only on your device. Even transcription runs locally — your audio becomes text without a single byte being uploaded. It works in airplane mode.
- Records only after you tap Start
- On-device speech-to-text, fully offline
- Face ID / Touch ID / passcode library lock
- Export only what you choose, when you choose
Record nonstop — or only when you choose.
Run a true 24×7 capture, or set precise windows with separate start and stop times for weekdays and weekends. Background recording continues reliably while your OS allows — and if the app was closed at a start time, one tap on the scheduled notification picks it right back up.
Every word, turned into searchable text.
Tap Transcribe and BlackBox converts a recording into clean, time-stamped segments you can read, search and copy — all generated by a model running on your phone. No upload, no waiting on a server, and it works completely offline.
Transcription works very beautifully within the app.
I can have multiple audio segments and it records all of them.
Transcription is now a feature within the app.▍
A day, broken into tidy hours.
Every day becomes a clean, browsable timeline of hourly files — so jumping to 2 PM last Tuesday takes two taps. Open any hour on a visual waveform, scrub and skip to the exact second, then transcribe, share or auto-archive it. Completed days package themselves and can back up to your own Files folder automatically.
People who never miss a moment.
“Set it once in the morning and forget it. I found a detail from a meeting I'd completely forgotten — scrubbed the waveform and there it was.”
“The fact that nothing leaves my phone is the whole reason I trust it. On-device transcription is shockingly good too.”
“I record every lecture. The hourly timeline means I never dig through one giant file again. It just quietly works.”
“Battery impact is way lower than I expected for something running all day. Honestly impressed.”
“Scheduled mode is perfect — records only during my work hours, weekends off. Exactly what I wanted.”
“Face ID lock on the library gives me peace of mind. Clean app, no fluff, does one thing brilliantly.”
Everything you might ask.
Still curious? Reach out any time at developerdumbledore@gmail.com.
Yes. Once you tap Start, BlackBox keeps recording in the background — with the screen off and while you use other apps — for as long as your operating system permits background audio. You can also schedule it to run only during specific weekday and weekend windows.
Everything is stored locally on your device. Audio never leaves your phone unless you explicitly share or export it. There is no account and no server in the middle. You can optionally turn on Cloud archive backup to copy finished archives into your own Files / Drive folder.
BlackBox transcribes recordings using a speech model that runs entirely on your device. Your audio is converted to searchable, time-stamped text without a single byte being uploaded — it works even in airplane mode.
Absolutely. Choose 24×7 for nonstop capture, or Scheduled mode to set separate start and stop times for weekdays and weekends. If the app was closed when a window begins, one tap on the scheduled notification picks it right back up — stops are automatic.
Completely. Recording, the hourly timeline, waveform playback and transcription all run on-device, so BlackBox works with no internet connection at all.
BlackBox is engineered for efficient all-day capture. Days are split into tidy hourly files and completed days are auto-archived to keep storage manageable. You can always see available storage right inside the app.
Yes. Turn on Library protection to require Face ID, Touch ID or your passcode before anyone can open your recordings.
Yes — BlackBox is available on the App Store for iPhone and on Google Play for Android.
Of course. Export a single hourly clip or a whole multi-day archive through the standard share sheet, save a copy to Files, or send it by email — whatever you need.
Your day is worth remembering.
Download BlackBox and press record once. The rest takes care of itself — privately, on your device.