Comparison

Trope vs Red Koto

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Generative soundscape creation
  • Interactive touch interface
  • Evolving musical textures
  • Introspective and atmospheric tone
  • Abstract shape tracing
Features
Read 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

About

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.

Highlights
  • 74 Koto tunings
  • Tuning by ear
  • Scale study
  • Interactive string display
  • Plucked and picked sounds
  • Customizable tuning order
Features
Read 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

Trope4 screens
Red Koto2 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Trope costs $3.99 and Red Koto $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
Trope versus Red Koto: the parameters behind the verdict, then further details
ParameterTropeRed Koto
Price$3.99 — better$8.99
Rating4.8 (38 ratings) — better1.0 (1 ratings)
Positive reviews63.7% of reviews — better40.0% of reviews
Number of ratings38 — better1
Update frequencyEvery 34 monthsEvery 6 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size39 MB29 MB
Age rating4+4+
DeveloperOpal LimitedOliver Grimm

Customer experience

Trope

All ratings38 ratings
Positive94.7%
Neutral5.3%
Negative0.0%
Written reviews146 reviews
Positive63.7%
Neutral11.6%
Negative24.7%

Red Koto

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews5 reviews
Positive40.0%
Neutral0.0%
Negative60.0%

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 more
  • 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 more
  • 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

None

Trope

No in-app purchases

None

Red Koto

No in-app purchases

Questions

Is Trope free?
Trope costs $3.99, with no in-app purchases.
Is Red Koto free?
Red Koto costs $8.99, with no in-app purchases.
Which has better reviews, Trope or Red Koto?
Trope is rated higher. Trope averages 4.8 out of 5 from 38 ratings, while Red Koto averages 1.0 from 1 ratings.
Do Trope or Red Koto have ads?
Neither Trope nor Red Koto shows ads.
Which is updated more often, Trope or Red Koto?
Trope ships an update every 34 months, and Red Koto every 6 months. Most recently, Trope was updated on October 29, 2026 and Red Koto on October 1, 2026.

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