PaSSBot vs sqsl Latch
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PaSSBot
This app is a stochastic filter bank audio processor for iPad, offering advanced sound manipulation with various filter types and powerful stochastic generators. It allows for precise control over filter parameters and harmonic distribution, ideal for creating complex audio textures.
- Stochastic filter bank audio processor
- Multiple filter types (Biquad, Ladder, SEM, Resonators)
- Up to 64 filters in stereo
- Powerful stochastic generators
- Individual filter parameter control
- Harmonic distribution options
- Precision DSP rendering (<1ms control rate)
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PaSSBot is a unique stochastic filter bank audio processor. The desktop VST/AU version of PaSSbot has already arrived in February 2020 and this iOS version is equivalent to the latest version 2.1. PaSSBot filter types are Biquad, StateVariableFilter, Ladder, SEM and Resonators. With behaviors of bandpass, Lo + Hipass, Notch and up to 64 of them in true stereo ! The user can set values of center frequency, gain and resonance of the each filter, which will be then eloborated with powerful stochastic generators ( 4 independent GENs for each filter ) with continuous or discrete probabilistic distributions but also with standard waveforms. One can set each filter parameters individually, but also distribute them in harmonic order, again the harmonic spread ratio can be set by the user or even can be modulated by a GEN. Precision DSP rendering, less than 1milisec. control rate precision. The filters can run continuously or be triggered manually. In that case, each filter will be applied an independent AR envelope with configurable random duration. Important notes : - A recent iPAD model is being recommended and also setting the host buffer size to 128 or higher greatly helps to the CPU needs which also heavily depends on the number of parallel filters being used. - The resonators can be sensitive to input signal level. - The PaSSBot manual can be found at this link. https://www.sonic-lab.com/PaSSBot_files/PassBot_manual.pdf sonicLAB PaSSBot youtube playlist : https://www.youtube.com/playlist?list=PLP0cOkraQHDYUoMG6BETTN1eGm-Kq5z0T
sqsl Latch
This app is a conceptual MIDI controller and sequencer for creating drone, textural, and soundscape synthesizer patches. It allows for sending MIDI notes, pitch bend, and CC values with advanced looping and parameter modulation features. Save and recall your setups for later use.
- MIDI note, pitch bend, and CC output
- 16 groups with assignable MIDI channel and color
- 8 assignable Continuous Controllers per group
- Looper for recording and shuffling note phrases
- Adjustable phrase playback speed and synchronization
- Parameter modulation via internal randomizer
- Smooth parameter transitions with LAG control
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sqsl Latch is a conceptual MIDI controller and sequencer designed for working with evolving drone, textural or soundscape synthesizer patches. It can send out MIDI notes, pitch bend and CC values. There are 16 groups split into 2 banks (a, b, c, … p). Groups have assignable MIDI channel, color and 8 Continuous Controllers (CC). When user touches one of the pads, note is activated and is held on until new touch (on the same pad) is registered. Left slider controls the velocity of note to be activated. Every group has a looper able to record note state changes - phrases. Order and velocity of recorded notes is automatically shuffled after phrase restarts (can be optionally prevented by activating group’s LOCK button). Phrase playback speed is adjustable (CLOCK and DIVIDER parameters). Phrase can be synchronised - set to restart automatically with previous group's loop. Synchronisation can be set to happen on every pass, every second, third... up to 16th and can be set to be ignored randomly (probability setting 0-100%). Group parameters can be adjusted using sliders or modulated by internal randomiser with adjustable range (RANGE and RANGE 2 parameters) and speed (per group LAG control - left-most slider). Apart user definable CCs, each group has following MIDI parameters: MOD (mod wheel), BEND (pitch bend), VOL (volume), EXP (expression), PAN (pan), FOOT (foot controller), TOUCH (aftertouch/channel pressure). Group parameters related to phrase playback are: CLOCK (resolution and playback speed), SYNC with divider (loop synchronization), NOTE SKIP (randomly skipping notes events 0-100%), SYNC SKIP (randomly skipping sync events 0-100%), DIVIDE (integer group's CLOCK divider), LOOP (loop or one-shot setting), SHIFT (degree offset with selected scale). LAG can be applied to parameter changes - when new value is selected, change does not happen immediately but value is transitioned smoothly based on LAG time (left-most slider). Setup setting (CC numbers, channels, colors, and MIDI output) are saved and recalled when app is restarted. Loops, CC values, parameters and their modulation states can be written to preset positions for later recall. For detailed description visit https://www.seqsual.com/latch Important notes: - Latch does not make any sounds on its own, it generates MIDI messages (notes, pitchbend and CC values). - Latch does not synchronise to incoming external MIDI clock. - Latch was designed for full-size iPads and is not recommended for iPad Mini users.
Verdict
The clearest difference is price: sqsl Latch at $19.99 against PaSSBot's $34.99. PaSSBot's advantage is rating (5.0 vs 3.7) and review sentiment (100% vs 67%). On ratings volume, update cadence, 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
PaSSBot costs $34.99 and sqsl Latch $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.
PaSSBot holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 8 and 3 respectively. Written reviews point the same way: 100% of PaSSBot's written reviews are positive against 67% of sqsl Latch's.
PaSSBot ships an update every 4 months, sqsl Latch every 5 months. The most recent releases landed on October 5, 2026 and September 26, 2026 respectively.
| Parameter | PaSSBot | sqsl Latch |
|---|---|---|
| Price | $34.99 | $19.99 — better |
| Rating | 5.0 (8 ratings) — better | 3.7 (3 ratings) |
| Positive reviews | 100.0% of reviews — better | 66.7% of reviews |
| Number of ratings | 8 — better | 3 |
| Update frequency | Every 4 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPad | iPad |
| Requires iOS | 11.0 — better | 15.5 |
| Further details — not scored | ||
| Size | 11 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | SonicPlanet Audio Video Teknolojileri Anonim Sti. | Michal Macura |
Customer experience
PaSSBot
sqsl Latch
In-app purchases
PaSSBot
No in-app purchases
sqsl Latch
No in-app purchases









