KeyMorph vs ostinata
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
KeyMorph
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KeyMorph is the ultimate practice companion for anyone playing a transposing instrument. With a full‑sized, touch‑responsive piano keyboard and a simple dropdown menu, you can choose an available instrument and immediately see the adjusted note names rendered atop each key—no mental math required. KeyMorph helps you: Visualize transposition in real time, so you always know which piano key corresponds to your instrument’s written pitch. Switch instruments effortlessly—great for multi‑instrumentalists or band directors working with different sections. Build confidence by practicing scales, chords, and melodies in their concert‑pitch form while seeing exactly what to play on your instrument. Ideal for students, educators, and professionals alike, KeyMorph makes learning and performing transposed music intuitive, accurate, and fun. Instruments Supported: Piano Violin Oboe Alto Saxophone Soprano Saxophone Tenor Saxophone Baritone Saxophone Trumpet French Horn Clarinet More instruments to come!
ostinata
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ostinata lets you map the actual paths you take through music. ever gone from radiohead to aphex twin because kid a changed how you think about electronic music? from miles davis to j dilla because someone sampled a love supreme? ostinata turns those invisible threads into visual, shareable directed graphs. — how it works — create a journey by adding nodes — artists, albums, genres, emotions, or concepts. connect them with directed edges that show which discovery led to which. add reasoning text to explain the connection. the result is a map of your taste that others can explore, fork, and build on. — search & discover — search for artists and albums via musicbrainz, the open music encyclopedia. album nodes display cover art. long-press any node to open its musicbrainz page for deeper exploration. — fork & remix — see a journey that resonates? fork it. you get a copy of the entire graph — all nodes, edges, and reasoning — that you can extend, rearrange, or take in a completely different direction. — bounties — post discovery challenges for the community. set a topic like "find the link: kraftwerk to detroit techno," define seed nodes as starting points, and offer resonance as a reward. other users form guilds of five to tackle the challenge together. — your data, your cloud — everything syncs privately via icloud. we store nothing on our servers. your journeys, your data, your control. — design — black canvas. white lines. ibm plex mono. all lowercase. album art in grayscale. ostinata is built for people who care about how things look as much as how they sound. ostinata — discovery through human curation.
Screenshots
Verdict
The clearest difference is update cadence: ostinata at every 9 days against KeyMorph's every 3 weeks. KeyMorph's advantage is iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
KeyMorph ships an update every 3 weeks, ostinata every 9 days. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.
| Parameter | KeyMorph | ostinata |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 weeks | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 31 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Omni Devs | Joachim Groeger |
In-app purchases
KeyMorph
No in-app purchases
ostinata
No in-app purchases









