Trope vs Red Koto
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Trope
Create evolving soundscapes by tracing abstract shapes on your screen. This app offers a darker, more introspective and atmospheric musical experience, ideal for generative music exploration. Recommended for use with headphones or external speakers.
- Generative soundscape creation
- Interactive touch interface
- Evolving musical textures
- Introspective and atmospheric tone
- Abstract shape tracing
Read full descriptionHide full description
Trope, designed by ambient pioneer Brian Eno and musician / software designer Peter Chilvers, expands further on the ideas introduced by Bloom, their acclaimed iPhone application. Darker in tone, Trope immerses users in endlessly evolving soundscapes created by tracing abstract shapes onto the screen, varying the tone with each movement. Recommended for headphones and external speakers. "Trope is a different emotional experience from Bloom - more introspective, more atmospheric. It shows that generative music, as one of the newest forms of sonema, can draw on a broad palette of moods." - Brian Eno
Red Koto
Explore a collection of 74 Koto tunings by a renowned virtuoso. Use it to tune your instrument by ear, study scales, or play along with unique compositions. The app features interactive strings and notes for an immersive musical experience.
- 74 Koto tunings
- Tuning by ear
- Scale study
- Interactive string display
- Plucked and picked sounds
- Customizable tuning order
Read full descriptionHide full description
RedKoto is a growing collection of currently 74 tunings by Koto Virtuoso Chieko Mori. Red Koto can be used for tuning the Instrument by ear, for studying scales, or for playing with the different tunings. These are the tunings for her compositions and for learning Koto Music at "Koto Studio" in Tokyo. The Score of each composition is available separately on demand. Sounds are played both picked with the left hand and plucked with the right hand using ivory picks. The middle of the screen represents the 13 strings of the Koto, each string plays a plucked sound at the corresponding pitch. To the right of the string the note is shown, touching each note produces a picked sound. The order of the tunings can be re-arranged by long-pressing on a tuning in the list. Except where noted differently, tunings are based on a root note of 442 Hertz. CHIEKO MORI KOTO STUDIO https://www.kotostudio.com ONLINE STORE https://store.kotostudio.com
Screenshots
Verdict
The clearest difference is rating: Trope at 4.8 against Red Koto's 1.0. Trope also leads on review sentiment (64% vs 40%) and price ($3.99 vs $8.99). Red Koto's advantage is update cadence (every 6 months vs every 34 months) and iOS requirement (13.0 vs 15.6). On ads, in-app purchases, monetization model 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
Trope costs $3.99 and Red Koto $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Trope holds the better App Store score, 4.8 against 1.0. That said, the two scores are not equally well evidenced: Trope has 38 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 64% of Trope's written reviews are positive against 40% of Red Koto's.
Trope ships an update every 34 months, Red Koto every 6 months. The most recent releases landed on October 29, 2026 and October 1, 2026 respectively.
| Parameter | Trope | Red Koto |
|---|---|---|
| Price | $3.99 — better | $8.99 |
| Rating | 4.8 (38 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 63.7% of reviews — better | 40.0% of reviews |
| Number of ratings | 38 — better | 1 |
| Update frequency | Every 34 months | Every 6 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 39 MB | 29 MB |
| Age rating | 4+ | 4+ |
| Developer | Opal Limited | Oliver Grimm |
Customer experience
Trope
Red Koto
Bugs and requests
Trope
Reported bugs
12 issues- Does not run in background/sleep mode
- App speeds up sleep timer
- Errors about iOS 11 incompatibility
- Cannot listen and create after update
- Screen looks awful (outdated UI)
Show 7 moreShow fewer
- App doesn't work/programmed feel
- Music doesn't stop when app is closed
- Sleep timer not working correctly in iOS6
- Glitchy sound/static at note start
- ノイズが入る (Noise occurs)
- 音が割れる (Sound distortion/crackling)
- Bug that changes line type back to default after erasing
Requested features
11 requests- Ability to save compositions
- Option to turn off random background noises
- More control over sound parameters (attack, duration)
- User sound input option
- Recording function
Show 6 moreShow fewer
- More variety in sounds and moods
- Mac app store version
- Streaming to AirPort Express
- Improve responsiveness to touches
- Option to remove random tones
- Background tasking/multitasking improvements
Red Koto
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Trope
No in-app purchases
Red Koto
No in-app purchases









