MIDI World vs RasterFX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MIDI World
Transform device sensors and real-world data into MIDI control and musical notes. Create multitrack recordings, adjust performances with per-track controls, and export to any DAW. Connect environmental data to your music.
- Sensor-to-MIDI mapping
- Real-world data integration
- Multitrack recording
- Per-track performance controls
- Standard MIDI File export
- Optional audio export
- Preset and theme customization
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MIDIWorld turns sensors and live data into MIDI control and notes. Map accelerometer, gyroscope, compass, GPS, barometer, microphone level, touch, light, proximity, and device motion into your performances. Layer weather, air quality, tides, visibility, seismic activity, place density, and market or FX-style feeds where available. Record multitrack sessions, adjust each source with per-track controls, and preview what you captured. Export Standard MIDI Files to use in any DAW or hardware that accepts MIDI. Optional audio export is available where the app supports it. Presets help you start quickly — from motion and tilt to weather, urban, health-driven, and experimental setups. Themes keep the interface comfortable for studio or stage. Permissions (Motion, Microphone, Location — including background when your session needs it — Health, Bluetooth) are used only to drive MIDI and related features on your device, as described in the system prompts and in our Privacy Policy. Whether you are sonifying a ride, the forecast, or generative patches from your environment, MIDIWorld connects world data to music.
RasterFX
This app is a playable modular multi-effects processor for music creation. It allows users to build complex audio effect chains, modulate any control with various sources, and perform patches live. Visualizers provide real-time feedback on sound changes.
- Modular multi-effects processor
- Build custom effect chains
- Modulate any control
- Live performance features
- Real-time visualizers
- Record and share audio
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Make any sound move. RasterFX is a playable modular multi-effects processor for iPhone and iPad. Use it standalone with a microphone, an imported audio file or built-in signals — or load it as an AUv3 audio effect in AUM, GarageBand, Logic Pro for iPad, Loopy Pro, Cubasis and other Audio Unit hosts. BUILD YOUR EFFECT CHAIN Choose from Filter, Delay, Drive, Reverb, Grain, Repeat, Motion and Dynamics. Arrange up to six plates in series or split them into parallel A/B paths. Reorder the chain and the sound changes with it. MODULATE ANY CONTROL Patch LFOs, envelope followers, random and chaos sources, step sequencers, MIDI, macros, the XY pad or device tilt to any control. Create up to 16 modulation lines, with live arcs showing exactly how the sound is moving. PERFORM THE PATCH Morph between four snapshots on the XY pad. Turn eight macros. Hold four momentary throws for stutter, sweep, reverse and freeze. RasterFX is built to be played with one hand, not programmed and left alone. GENERATE, LOCK, EVOLVE Nudge a patch, reshape it or roll a new one. Lock the parts you want to keep, undo any result and save the seeds worth returning to. Evolve lets the patch drift over time while staying anchored to the sound you chose. SEE WHAT YOU HEAR Every effect has its own live visualizer. The CRT and halftone interface makes filters, delay taps, grains, dynamics and modulation visible without turning the screen into a wall of meters. RECORD THE RESULT Record the processed output to WAV, rename takes and share them from the app. FREE TO START. PRO ONCE. Free includes all eight effects, all modulation sources, every factory preset, three plates, four modulation lines and 60-second recordings. No ads, account, watermark or reduced audio quality. RasterFX Pro is a one-time purchase — not a subscription. It unlocks six plates, 16 modulation lines, split routing, XY snapshot morphing, Evolve, A/B compare, unlimited recording length and your own saved presets. Your saved sound always plays back exactly as created, even if it uses Pro features; Free limits editing, never playback. Made for headphones, late at night.
Screenshots
Verdict
The clearest difference is price: RasterFX at Free against MIDI World's $0.99. RasterFX also leads on rating (5.0 vs 2.0). MIDI World's advantage is in-app purchases (none vs 1). On ratings volume, ads, device support and iOS requirement 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
RasterFX is free to download; MIDI World costs $0.99 up front. RasterFX sells 1 one-off in-app purchase. MIDI World asks for nothing beyond the download.
RasterFX holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.
| Parameter | MIDI World | RasterFX |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 2.0 (1 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 | 1 |
| Update frequency | Every 7 months | — |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Freemium — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 14 MB | 5 MB |
| Age rating | 4+ | 4+ |
| Developer | Los Palmos | Chih Han Lin |
Customer experience
MIDI World
RasterFX
In-app purchases
MIDI World
No in-app purchases
RasterFX
- RasterFX Pro$3.99









