Vascular vs Bent Spool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Vascular
Create electroacoustic music by visually connecting sound generators and processors on a canvas. Manipulate stereo position, control synthesis and processing, and build complex signal paths. Explore a vast array of synthesis types, effects, and controllers to craft unique sonic textures.
- Canvas-based sound design
- Modular signal path building
- Extensive synthesis families
- 71 built-in processors
- Advanced controller modules
- Sample playback and manipulation
- Microphone input processing
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Vascular is a canvas-based electroacoustic instrument. Create sound generators and processors by touching the canvas, then connect them to build the signal path. Moving a node changes its stereo position, while each node provides its own synthesis, processing, modulation and rhythmic controls. FEATURES - 55 synthesis families, including subtractive, FM, additive, granular, spectral, physical modelling, wavetable, wave-terrain, pulsar and stochastic synthesis. - 3 macrosynths, complete synthesizers in a single node: resurgent (2 scenes, 3 oscillators, 2 filters, effects), bayarea, a West Coast voice, and poundhard, an FM drum voice from kicks to industrial percussion. - A complete DX7 implementation. - Holos, a special node that combines elements and parameters from other nodes to create a new semi-modular synthesizer instantly. - A sample player for loading your own loops, with time-stretching, forward and reverse playback, stuttering, splicing and tape-style manipulation derived from classic electroacoustic techniques. - Sampled acoustic instruments that generate melodic loops in the session's tonal key. - Drum synthesis, a 303, a 16-oscillator supersaw and live granular processing. - Microphone input for processing external sound. - 71 processors, including filters, distortion, delays, combs, phasing, diffusion, reverb, spectral freezing, convolution, pitch tracking, harmony, vocoding, spectral delays, tape loops and broken-media effects. - Host your own AUv3 instruments, effects and MIDI plugins as nodes on the canvas, their settings kept with your sessions (in-app purchase). - 7 controllers that play or move other nodes: a melodic sequencer with a piano-roll editor; an arpeggiator that turns a single arpeggio into a fugue across up to 6 voices; a drum machine with fills and breaks; a shift register; bouncing cars whose collisions are notes; a Game of Life swept by a playhead; and an LFO controller with 3 LFOs on each of up to 6 nodes. - Kick side chains with adjustable depth, and a master bus compressor. - An effects sequencer with 4 lanes of any processor, each with its own length. - A randomizer that creates whole patches, transforms what is on the canvas, expands it or dismantles it, and deals or removes LFOs, gates and motifs. - A padlock on every parameter, keeping it out of reach of the randomizer and every LFO. - Mute and solo: tap a node to mute it, hold it to hear it alone with its chain. - Angiogenesis, which moves nodes, rewires connections, adds processors and changes their parameters automatically. It never removes your voices, cuts a controller's connections or modifies microphone nodes. - Adjustable mutation rate and automatic adaptation to the processing capacity of the device. - A shared session clock with tap tempo and an independent clock division for each rhythmic source. - 27 scales from 4 musical traditions, plus microtonal tunings imported from Scala files. - Guided paths for restricting generators and processors to a selected musical territory. - A searchable palette, in alphabetical order, with favourites. - Rebalance, which spreads the outputs evenly across the whole stereo field. - A multilayer gesture looper. - 32 pattern slots with adjustable morphing between complete instrument states. - Sessions that store the network, settings and tonal key together. - 48 levels of undo and redo. - Recording, playback, renaming and sharing of takes. - A transport that stops active sound sources while allowing effect tails to decay naturally. AUV3 Vascular also runs as an AUv3 instrument in AUM, Loopy Pro, Logic and other compatible hosts, and follows the host's tempo and transport. The interface runs full-screen in landscape orientation and is operated directly with your fingers. The main buttons remain along the top of the display, away from the hand interacting with the canvas.
Bent Spool
This music app offers creative audio effects for live performance or use within other music apps. Explore rhythmic tremolo, pitched repeats, and looping fragments of your audio. It includes built-in overdrive and tape effects for unique sound shaping.
- Rhythmic tremolo effects
- Pitched repeat sequences
- Overlapping audio loops
- Built-in overdrive and fuzz
- Vintage tape effects
- Standalone and AUv3 host support
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Bent Spool is a creative effect that can transform simple musical parts into unexpected rhythms and melodies, played live or as an effect in your favorite host app. Shape a tremolo pulse, turn a note into a run of pitched repeats, or build a moving layer from fragments of what you just played. Drive the input with built-in overdrive or fuzz, add a core effect, then finally layer in vintage analog tape effects. THREE MODES TREM: a pulsing volume effect, from a rounded sine through triangle and sawtooth to a hard square gate. Syncs to your host's tempo or runs free. REPEAT: up to 64 pitched copies with their own decay and feedback, across five pitch stations from two octaves down to two octaves up. LOOPS: up to six overlapping fragments of your recent audio, spread across pitch, direction, read position and the stereo field. CHARACTER CHAOS adds movement that suits each mode: octave jumps in REPEAT, held or stalled pulses in TREM, wandering reversals and pitch drift in LOOPS. WEAR adds tape wear, magnetic saturation and digital crush after the active mode. At the input, OD is a softer clip; FUZZ is a harder distortion that sputters as it decays. PRESETS 48 factory presets: 10 TREM, 15 REPEAT, 15 LOOPS and an 8-preset Fuzz Tremolo pack. Unlock to save your own. FREE TO TRY TREM plays in full on the OD voice with ten presets. No time limit, no interruptions. A single $9.99 in-app purchase unlocks REPEAT, LOOPS, FUZZ, the rest of the presets and preset saving. No subscription. Runs as a standalone app or as an AUv3 effect in AUM, Loopy Pro and other AUv3 hosts, on iPhone and iPad.
Screenshots
Verdict
The clearest difference is price: Bent Spool at Free against Vascular's $3.99. Bent Spool also leads on rating (5.0 vs 4.8). Vascular's advantage is in-app purchases (none vs 1). On ratings volume, update cadence, ads and device support 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
Bent Spool is free to download; Vascular costs $3.99 up front. Bent Spool sells 1 one-off in-app purchase. Vascular asks for nothing beyond the download.
Bent Spool holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 6 and 5 respectively.
Both ship on a similar rhythm, roughly daily. Both last shipped on October 24, 2026.
| Parameter | Vascular | Bent Spool |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 4.8 (6 ratings) | 5.0 (5 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 6 — better | 5 |
| Update frequency | Daily | Daily |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 101 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Absolute Management SIA | Plastic Factory LLC |
Customer experience
Vascular
Bent Spool
In-app purchases
Vascular
No in-app purchases
Bent Spool
- Bent Spool Unlock$9.99






