Tap. Beatbox. Tap again.

BL-202 is a two-track live looper for Android phones, built to play like a hardware pedal. Scroll to play the first loop. Your thumb is the transport.

Join the alpha How it plays

One round key per track

Each track has one round key, and it always does the next thing that track needs: record, play, or stack another layer. The round keys fire the moment your thumb lands. Nothing hides behind a swipe.

Both tracks · Empty

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Skip to the alpha

Red means the mic is live

Tap track 1 and beatbox. The key goes solid red with a dot while it records, and on this instrument red means that and nothing else. Your first take can set the tempo, or tap one in first with TAP.

Track 1 · Rec

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Tap again and it loops

The take closes and plays straight back in yellow. The ring goes round once per pass, with a white bar where the loop is now, so you always know where the top is.

Track 1 · Play

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Track 2 comes in on the one

Tap track 2 mid-phrase. Its display blinks ARMED and counts the beats in, and the take starts on the loop boundary, not where your thumb landed, so the layers line up. Scroll slowly past the boundary line and watch it flip to REC.

Track 2 · Armed

Drawing: both round keys side by side. Track 1 reads PLAY in yellow; track 2 reads ARMED, with a pale ring around its cap while it waits for the loop boundary.

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Layers stack on one clock

Yellow and lilac, lit to the same point, because both follow one clock. Tap a playing track to stack another layer on it. UNDO takes the last one off, and holding STOP clears the track.

It is built like a pedal: one visible key per action, sized for a stage, nearly every one firing the moment you touch it, with reliability ahead of features.

2 tracks · 1 clock

Drawing: both round keys reading PLAY, one yellow and one lilac, their rings lit to the same point because both follow one clock.

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Hold it sideways

The app plays in landscape only: a loop key under each thumb, the tempo between them, a level fader on each outer edge.

Screenshot of the BL-202 alpha with both tracks playing: the PITCH and ROBOT input FX keys and the SCATTER and REPEAT track FX keys along the top on either side of the display, a yellow and a lilac loop key, and a level fader on each outer edge. — The 1.1 alpha with both tracks playing, captured on an emulator with no mic input, so the display shows flat takes. 2026-10-22.

Turn it sideways

Loop key: Tap to record, tap again to play, tap a playing track to add a layer.
Ring: 48 bars of light, one lap per loop. The bright bar is now.
Display: State, time and a picture of each track’s take, sized to read at a glance.
Stop: Tap to stop the track. Hold to clear it.
Undo: Takes the last layer off.
Level: One fader per track, with a detent at 0 dB.
Tempo: The session tempo, with a lamp on each beat. TAP sets it by hand.
All: Starts or stops both tracks together.
Input FX: FX A and FX B each hold an effect for your mic: pitch, robot, filter or lo-fi. FX EDIT opens the panel where you pick and set them.
Track FX: TRK FX A and TRK FX B put an effect on the loops of track 1, track 2 or both: the mic effects, plus beat scatter, beat repeat, beat shift and vinyl flick. Tap one to switch it on or off, or hold it to use it only while you hold. TRK EDIT opens their panel.

Specification

Tracks: Two, mirrored.
Per track: A round loop key to record, overdub and play; STOP, held to clear; UNDO; a level fader.
Tempo: A session tempo from the start. TAP sets it by hand, and − and + nudge it.
Loop settings: Per track: on the bar grid, free length from tap to tap, or at its own tempo. LENGTH ×2 on the Loop tab doubles a track’s loop.
Input FX: Two slots on the mic: pitch, robot, filter and lo-fi.
Track FX: Two slots on the loops of track 1, track 2 or both: the mic effects, plus beat scatter, beat repeat, beat shift and vinyl flick.
Controls: One visible key per action, built on a 56 × 48 key module, nearly all firing on touch-down. No gesture shortcuts.
Mic to ears: Target: Under 20 ms round trip.
Loop edges: Target: Pop-free loop boundaries.
Timing: Target: Tracks that never drift apart.
Sessions: Your loops come back when you reopen the app.
Screen: Landscape, full screen.
Runs on: Android 8 or newer.

The engine is built to these design targets. Nobody outside development has run this build yet; the alpha is how we measure them.

Your turn on track 1

The Android alpha runs on Discord. Tell us about your phone first, so we know it can keep time.

Before you play

Need: Android 8 or newer.
Need: Headphones. Wired or USB-C is best; Bluetooth works, with delay.
Need: Your phone turned sideways: the app is landscape only.
Not yet: More than two tracks.
Not yet: Saving loops as files. Your session comes back when you reopen the app, but a loop can’t be exported yet.

Sign up

Android version

Find it in Settings, About phone, Android version. On Samsung: Settings, About phone, Software information.

Phone model

Headphones you would loop with Wired or USB-C headphones Bluetooth headphones or earbuds None, phone speaker, or a Bluetooth speaker

I am 18 or over

The alpha is for people 18 or over. Leave this unticked and you go on the waitlist.

We’ll request a confirmation email. Confirm your address before receiving a join code or alpha access. The link expires after 24 hours.

What happens to your answers

Your email, Android version, phone model, headphone type and 18-or-over answer are used only for the BL-202 alpha: to check your phone can run it and to email you about it. Until you confirm your email, Supabase, our database provider, holds your answers for up to 24 hours. Resend sends the confirmation email and gets only your email address.

After you confirm, Supabase keeps your answers and whether you are eligible. The 18-or-over answer itself is kept only briefly. A cookie lets this browser manage your signup for up to 24 hours.

Held by 98kb (github.com/98kb). Ask dsfx3d.98kb@gmail.com to see or delete your answers. Your sign-up answers are deleted when the alpha ends. Provider backups and logs are cleared on their own schedules.

What the alpha app sends

The app is separate from this form. To use it you agree to send testing telemetry: crash reports, audio performance data and a record of what happens in your visits. Your audio and your loops are never sent.

Events go to PostHog and crash reports go to Firebase Crashlytics, tied to your join code. The telemetry is kept until the owner removes it or the service’s own limit expires, whichever comes first: one year for events, 90 days for crash reports. You can ask the owner to delete yours. Read the privacy policy.