MIDIWeb Browser vs Pentatone
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MIDIWeb Browser
This music app allows users to interact with WebMIDI websites, enabling them to learn, create, and play music. It serves as a companion for exploring MIDI functionalities online.
- WebMIDI website interaction
- Music learning tools
- Creative music tools
- MIDI exploration
- Companion app
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Your new MIDI App companion, built for WebMIDI websites. Learn, create and be inspired to play more with MIDI! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Pentatone
This music app offers a unique pentatonic keyboard and built-in synthesizer, inspired by instruments like the kora and mbira. It features a sophisticated scale selection system and is optimized for touchscreen devices, providing an expressive and easy-to-play musical experience.
- Easy-to-play 'strummable' pentatonic keyboard
- 9 selectable pentatonic scales
- Custom FM synthesizer engine
- 25 preset sounds with macro controls
- Polyphonic touch and aftertouch response
- AUv3 functionality for host apps
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"Beautiful, fun and inspiringly expressive" - The Arithmophone Pentatone is a music app featuring an easy to play pentatonic keyboard and a built-in synthesizer. Instead of using piano keys or a grid-based interface, Pentatone takes a fresh approach, optimised for the ergonomics of touchscreen devices and inspired by instruments like the kora and mbira. The app also has a sophisticated scale selection system that includes all the common pentatonic scale types and unlocks some more unusual ones. Pentatone features: - An easy-to-play and 'strummable' keyboard, split for two handed playing - An original pentatonic scale system with 9 selectable scales, in just intonation or standard tuning - A custom synth engine (binaural 2x2 op FM with stereo detune, resonant filter, delay and reverb) - 25 preset sounds with macro sliders for tone and ambience - Initial touch and aftertouch response, both polyphonic - AUv3 functionality for use within host apps like GarageBand, Koala Sampler and Loopy Pro Pentatone user feedback: "Amazing! Love the simple UI and the musical keyboard. Also the sounds are lovely!" "This is very cool - beautiful interface and instantly musical." "This really is a joy to play and the tones are really expressive in fun ways that invite different types of creativity." "This app is such a brilliant idea!" "This is amazing. So fun to play. So easy to play with my daughter and my niece. The tones are wonderful." "This is an inspiringly expressive instrument! Really a joy to interact with." "This thing is AWESOME! It’s so easy to make up new stuff with it!" *** Pentatone is part of the Arithmophone project An Arithmophone is a thing that turns numbers into sounds, or math into music. Its name is derived from the ancient Greek words arithmos (number) and phone (sound). Any iPhone or iPad is itself an Arithmophone, because it routinely turns lists of binary numbers into sounds, for example when you use it to listen to music. But this app is a bit more 'arithmophonic' still, because it takes pure and simple harmonic ratios like 3:2 and 5:4 and uses these to build musical scales. You can use it as an easy-to-play instrument, a source of melodic and harmonic inspiration or a tool for learning about music and exploring the deep connection it has with numbers. Keep an eye out, future plans for the Arithmophone on iOS include: - PENTATONE JR., a simplified and text-free version of Pentatone, optimized for young/beginning musicians - DIATONE, the diatonic companion to Pentatone, featuring a 7-note-per-octave keyboard with all the familiar major and minor scales and modes - MIDI / MPE versions of Pentatone and Diatone - TONEHIVE, a microtonal keyboard synth for 7 limit just intonation - HUYGENS, a microtonal keyboard synth for 31 EDO To stay posted, join the community at reddit.com/r/arithmophone or subscribe to the Arithmophone youtube channel: https://www.youtube.com/@arithmophone
Screenshots
Verdict
The clearest difference is in-app purchases: Pentatone at none against MIDIWeb Browser's 3. Pentatone also leads on iOS requirement (15.6 vs 17.6). MIDIWeb Browser's advantage is update cadence (every 6 days vs every 5 weeks). On price, rating, review sentiment and ratings volume 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. MIDIWeb Browser sells 3 in-app purchases, starting at $2.99 per month. Pentatone asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for MIDIWeb Browser against 5.0 for Pentatone. Both are backed by a comparable volume of ratings — 5 and 13 respectively. Written reviews split almost evenly too, at 100% and 100% positive.
MIDIWeb Browser ships an update every 6 days, Pentatone every 5 weeks. The most recent releases landed on September 19, 2026 and September 27, 2026 respectively.
| Parameter | MIDIWeb Browser | Pentatone |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (5 ratings) | 5.0 (13 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 5 | 13 — better |
| Update frequency | Every 6 days — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, Mac, Vision Pro — better | iPhone, iPad, iPod |
| Requires iOS | 17.6 | 15.6 — better |
| Further details — not scored | ||
| Size | 9 MB | 16 MB |
| Age rating | 17+ | 4+ |
| Developer | 5of12 LLP | Chiel Zwinkels |
Customer experience
MIDIWeb Browser
Pentatone
In-app purchases
MIDIWeb Browser
- MIDIWeb Supporter$2.991 Month
- Espresso$2.99
- Double Espresso$4.99
Pentatone
No in-app purchases








