Holon vs Rivet 04
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Holon
This app transforms your movement through cities into a dynamic, real-time musical score. It uses your physical location and activity to generate interactive synth music, encouraging outdoor exploration and turning listeners into performers.
- Human-powered music generation
- Encourages outdoor activity
- Zero UI for minimal distraction
- Environmentally responsive music
- Real-time synth music creation
- Optional AirPods and Apple Watch integration
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Holon makes the city your instrument. It turns your movement in the environment into a synthetic, interactive score that reflects your context, supports your activities and alerts you to changes in the surrounding area. Holon uses physical computing and a geospatial dataset to synthesize music on the iPhone in real time from your data - no streaming or AI involved, just pure DSP and logic. What Holon Does: * Human powered music. Every action generates dynamic, improvised synth music in real time. * Encourages outdoor activities. Holon doesn’t work in your apartment or by shaking your phone around. Move through streets, parks, and transit systems to make the music happen. * Stays out of your way. Zero UI means less screen time, no distractions. * Uses places and spaces to modify the music you make. The environment isn’t background - it’s the score. * The more and further you move, the more things happen in the music. Use your musical agency instead of skipping and swiping. Why Holon Exists: Music has been reduced to a commodity and a background activity for consumerism. Holon isn’t here to help you chill when you swipe, scroll and buy more stuff, or improve your focus when working for the Man. Holon is here to break away from the static, one-way relationship of streaming services and to put the human in the loop - yourself. Forget emoting celebrities with their false sincerity, throw overproduced passive soundscapes and statistical algorithms on the dung heap of history. Holon turns listeners into performers and unlocks the musical potential of places. How to Use: * Go outside - Holon needs space to function, just like you. Different districts, parks, bridges, shops, street furniture - all contribute to the musical output. Strolling around your apartment or shaking your phone won’t do. * Put the phone in your pocket or on your dashboard. * Walk, run, drive - the world is now the interface, space is the machine. * Use the big button in the middle to power Holon off when not in use - Auditory AR can be a battery-intensive process! * Optional Apple AirPods support for head-controlled musical interactions! * Optional Apple Watch support for heart rate-synced music (biofeedback) *the Watch app may take a moment to install* Requirements: * Available in over 1000 regions in more than 100 countries. * Check coverage or request a new area at holonic.systems/holon. * Best experienced with headphones. Ensure adequate battery level for extended use. * A data plan is required to access our geospatial engine but use of data is low. Holon: Become part of the circuit and… Become Sound™
Rivet 04
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Rivet 04 - Comb is a resonant comb filter built for techno and industrial. Put it on drums, synths, or any bus to create metallic resonance, pipe tones, and reverb-like tails, from subtle shimmer to aggressive industrial texture. Comb works both as a standalone app and an AUv3 plugin. Comb combines feedback resonators with internal saturation for rich harmonic colour. Pitch the resonance to your key, add chord intervals for harmonic resonance, or push it into metallic destruction with the HOT mode. KEY FEATURES • Resonant comb filter with pitchable tuning and chord modes • DRIVE saturation inside the feedback loop • LFO modulation for shimmer and movement RIVET SERIES / OPEN SOURCE • Comb is part of my Rivet series of AUv3 effects plugins targeting techno and industrial genres. Comb uses algorithms by Chris Johnson (Airwindows), made available under MIT license. AUv3 Effect • Works in AUv3 hosts such as AUM, Drambo, Logic, and Cubasis IN-APP PURCHASE Comb includes In-App Purchases for optional tipping. Tipping does not unlock any additional features as all features are already available.
Screenshots
Verdict
The clearest difference is device support: Holon at 4 against Rivet 04's —. Holon also leads on iOS requirement (12.0 vs 17.6). On price 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. Holon sells 2 one-off in-app purchases and Rivet 04 sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
| Parameter | Holon | Rivet 04 |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (14 ratings) — better | — |
| Positive reviews | 75.0% of reviews | — |
| Number of ratings | 14 — better | — |
| Update frequency | Every 3 months | — |
| Ads | No | — |
| In-app purchases | Yes | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | — |
| Requires iOS | 12.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 144 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Holonic Systems Oy | Joe Topjian |
In-app purchases
Holon
- Apple Watch supportFree
- Movesense SupportFree
Rivet 04
- Tip - Small$0.99
- Tip - Medium$1.99
- Tip - Large$3.99









