Recursion by folina vs Additive Synth
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Recursion by folina
This app creates evolving echoes and feedback effects by mutating sound over generations. It offers unique control over timing, memory, and signal degradation for creative sound design. Explore subtle echoes to unstable ambient spaces.
- Self-mutating recursive delay
- Generational sound evolution
- Independent control over recursion depth
- Continuous drift and instability
- Smearing for evolving washes
- Tear events for abrupt mutations
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Recursion is a delay and feedback effect built around inherited mutation. In a conventional delay, a sound repeats. In Recursion, it evolves. Each generation passes through a changing recursive system before becoming the source for the next. Timing drifts. Memories smear together. Sudden tears disturb the signal. Those disturbances are then inherited by everything that follows. The result can move from subtle animated echoes and strange doubling to deteriorating rhythmic patterns, unstable ambient spaces, and dense halls of increasingly distant memories. Seven controls keep the process immediate. Memory determines the spacing between generations. Recursion determines how deep the family tree grows. Decay determines how long those generations survive. Smear, Drift, and Tear determine how faithfully—or badly—the signal remembers its past. Recursion isn't designed to be a perfectly behaved delay. It's designed to remember. Incorrectly. Features: Self-mutating recursive delay and feedback processing Each generation inherits changes from the generation before it Independent control over recursive depth, memory spacing, and decay time Continuous bounded drift and instability Smearing that transforms distinct echoes into evolving washes Tear events introduce abrupt mutations into the recursive history From subtle animated echoes to deeply unstable feedback structures Designed for drums, synths, guitars, vocals, sound design, and ambient processing. -------------------------------------------------------------------------------------- Behavior Note: Recursion is intentionally less predictable than a conventional delay. At high Mix settings, more of the immediate dry attack is replaced by the delayed recursive signal. Short sounds may therefore seem quieter as Mix approaches fully wet. Around 50% Mix is recommended when you want to preserve the original attack. Recursive processing can also produce occasional abrupt transient or crackle-like textures as generations mutate and interact, particularly with sustained material, aggressive settings, or parameter movement. These behaviors are part of Recursion's unstable character.
Additive Synth
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WHAT IT IS Additive is a synthesizer that builds each sound up from harmonics instead of using a filter to cut it down. You can set every harmonic individually, then shape how it moves over time: some can pulse together while others drift, shimmer, or move in the opposite direction. This gives you control over every part of the spectrum and a large range of sounds, from shimmering pads and bell-like plucks to deep resonant basses. Start with a preset, generate a sound with Random, or build your own from the ground up. WHAT IT DOES * Harmonic bank: set up to 50 harmonic bands by drawing them, picking a shape, or generating a random spectrum. Every band is yours to change. * Custom movement for every harmonic: give each band its own modulation depth, phase, and rate, so the movement happens inside the sound. * Cutoff and resonance, uncoupled: Bands and Slope set the cutoff, while Bulk is a resonant peak you can place anywhere in the spectrum, independent of where cutoff sits. * Morph: draw two spectra and move between them by hand, with an LFO, or with an envelope. A note can begin as one sound and become another. * Modulation: four LFOs with nine shapes, including ones you can draw yourself, plus tempo sync and four envelopes. * Voicing: Character, Detune, Chorus, Drive, and Stereo take the harmonics from pure sine waves to analog-leaning, distorted, or otherworldly. * Play the spectrum: assign brightness, movement, Morph, or anything else to the XY pad and the Z slider, and explore the movement inside the spectrum yourself. * Presets and Random: more than 100 presets cover basses, pads, textures, plucks, leads, bells, organs, keys, brass, and drones. Random generates a whole new sound, and you can adjust every detail to make it your own. * FX: delay, reverb, drive, compression, and EQ are built in, so your sounds leave Additive finished. * AUv3 and standalone: load Additive as an instrument in your host, or play it directly in the app with the on-screen keyboard and arp. * Four themes: Hardware, Cobalt, Dark, and Light. REQUIREMENTS * iPad with iPadOS 15 or later * An AUv3 host for the plugin, for example AUM (the standalone app needs none)
Screenshots
Verdict
The clearest difference is price: Recursion by folina at $3.99 against Additive Synth's $8.99. On rating, 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
Recursion by folina costs $3.99 and Additive Synth $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Recursion by folina against 5.0 for Additive Synth. Both are backed by a comparable volume of ratings — 1 and 2 respectively.
| Parameter | Recursion by folina | Additive Synth |
|---|---|---|
| Price | $3.99 — better | $8.99 |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 1 | 2 — better |
| Update frequency | — | Every 8 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 15 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Jeremy Phillips | Snorkel Audio, Inh. Michael Kaisser |
In-app purchases
Recursion by folina
No in-app purchases
Additive Synth
No in-app purchases





