Roostbox vs Q BIT Crusher
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Roostbox
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Roostbox is a groovebox that looks like a retro arcade cabinet and plays like one. It makes techno and other electronic music live, by hand: fly a ship through a beat, ride the faders, flick the stick, and every gesture you make is recorded and loops with the beat. It is a different way to play electronic music live. There is no step grid to program and no timeline to edit. Everything on screen is a control, you play it with two thumbs, and the loop keeps what you played. Two kits are in the box, and everything is free: both kits, the whole performance surface and the AUv3 plugin. No purchase, no account, no ads. Play it standalone on iPhone or iPad, or load it as an instrument inside AUM, Loopy Pro, Cubasis, Drambo or Logic Pro for iPad. TWO KITS IN THE BOX SPACE: fly a ship through a beat. Where the ship goes picks the groove: four-on-the-floor, backbeat, offbeat, broken, sixteenths. The cockpit page holds the mixer, a stick for filter and grit, overdrive, pump, tape, delay, reverb, crush and a DJ filter. A 303-style acid bass and a drum synth make the sound. PLIVKA: a four-track techno box. Kick, bass, snare and hat, each with a pattern control and a hit control, laid out over five pages: Rhythm, Sound, Perform, FX and Mix. The bass line is a Turing machine that mutates as much or as little as you let it. UNDER THE HOOD - Euclidean rhythm generators, a Turing machine sequencer and a trigger sequencer drive the patterns. - A drum synth and a 303-style acid bass synth make the sound. No samples. - Every fader move is recorded as motion and loops with the beat. Undo and redo if you change your mind. - Scenes: snapshot the whole kit and switch on the next sixteenth, beat, bar or pattern. - Master effects: delay and reverb sends, filter, crush, tape, compressor, sidechain pump and a limiter. - MIDI learn: map any control to a hardware controller. - Landscape only. Made for two thumbs. AUv3 The plugin is the same instrument as the app, with the same two kits, and it is free. It follows the host tempo and transport. Jam in the standalone app; record into your DAW with the plugin. WHAT 1.0 IS Two kits, built to be played. Building your own kits is not part of this version. Roostbox is made by one person. If something is broken, tell me: reach.freefall.studio@gmail.com
Q BIT Crusher
This app offers a bit crusher effect with a unique time-hold feature to add grit and character to audio. It allows for creative manipulation of sound slices, offering retro chip-like qualities for modern production. It can be used as a standalone app or an AUv3 plugin.
- Four distinct bit crusher models
- Adjustable bit depth and sample rate
- Time-hold feature with tempo sync
- AUv3 plugin compatibility
- Standalone app for live processing
- Extensive preset library
- Full parameter automation
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Q BIT is a bit crusher with a time hold, now on your iPhone and iPad. The crusher gives your sound its grit. HOLD grabs slices of your track and holds them, on your song's tempo or at its own pace. Q BIT does more than lower the quality of a sound. It reshapes the signal itself, giving it the character and musicality of a retro sound chip while keeping it relevant to modern production: a way to make digital reduction playable. HOLD is the heart of Q BIT. At every grab, a slice of your track plays as it is; then the hold freezes its end and sustains it until the next grab. On a held note it sounds like a tremolo or a pulse; on drums, like a rhythm of short hits and held tones. SEGMENT sets how much of each slice plays before the hold takes over, and in Sync a green arc on its ring shows the settings that keep every hit of the last bars intact. Use it as an AUv3 plug-in in your favorite host (Logic Pro for iPad, GarageBand, AUM, Cubasis and more) or as a standalone app processing live sound from your microphone or an audio interface. KEY FEATURES: - Four crusher models, each showing only its own controls: Linear, flexible bit crushing where you set the bit depth and the sample rate; SP-1200, a punchy, gritty drum-sampler character with a softer top end; M.93, a vintage digital-delay character, clean on quiet sounds and gritty on loud ones; ZX Spectrum 128, a coarse, retro home-computer character - BITS from 24 down to 2 bit and RATE from your session rate down to 2 kHz (Linear) - MULTIPLY 1x, 2x, 4x or 8x (M.93): each step darker and grainier - CHANNELS (ZX Spectrum 128): Mono, like the original, or Stereo, a chip for each side - HOLD: Off, Free (1 to 16 grabs a second) or Sync (1/4 to 1/32, straight, dotted or triplet, on your host's tempo) - INPUT drives the crusher, MIX blends your dry track back in, OUTPUT sets the final level, and the INPUT / OUTPUT Link switch in the menu changes the drive while keeping the level - MATCH holds the output at the loudness of bypass while you adjust the controls, so you judge the sound, not the volume - The display shows your sound as it plays, the sound going in and the stepped sound coming out, with the OUT and IN peak levels one above the other - Type a value: tap the readout of HOLD RATE, SEGMENT, INPUT, MIX or OUTPUT - Mono and stereo - 33 factory presets in six folders (Drums, Extreme, Lo-Fi Machines, Rhythm, Synths and Keys, Vocals and Samples), with descriptions, tags, search and favorites - A/B slots with copy - Made for touch: the help shows while you touch a control, and a long press opens the preset and folder menus - Preset import and export through Files - Full parameter automation in AUv3 hosts All audio is processed on your device. No account, no data collection, no internet connection required. Q BIT is not affiliated with, and is not endorsed by, the makers of the machines its models follow. All trademarks belong to their respective owners.
Screenshots
Verdict
The clearest difference is rating: Q BIT Crusher at 5.0 against Roostbox's 4.5. Q BIT Crusher also leads on update cadence (every 4 days vs every 3 weeks). Roostbox's advantage is iOS requirement (13.0 vs 15.0). On price, ratings volume, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Q BIT Crusher holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 4 respectively.
Roostbox ships an update every 3 weeks, Q BIT Crusher every 4 days. Both last shipped on November 13, 2026.
| Parameter | Roostbox | Q BIT Crusher |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 2 | 4 — better |
| Update frequency | Every 3 weeks | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 71 MB | 17 MB |
| Age rating | 4+ | 4+ |
| Developer | ARTEM VOVSIA | Pulsar Modular |
Customer experience
Roostbox
Q BIT Crusher
In-app purchases
Roostbox
No in-app purchases
Q BIT Crusher
No in-app purchases







