Osculatrix vs C.ARP
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Osculatrix
This audio effect plugin offers modulated filters, delays, and saturation for creative sound design. It can transform audio from subtle coloration to complete destruction. Use it within your favorite music production apps.
- Modulated filters
- Delay effects
- Saturation
- AUv3 plugin
- Subtle coloration to destruction
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Osculatrix is a tremolo with ideas above its station. With modulated filters, delays, a bit of saturation. Like its predecessors, it is cryptic and opinionated, and it goes from subtle colouration to total destruction at the twist of a knob. Osculatrix is an AUv3 effect plugin. It does nothing on its own. Use it in GarageBand, AUM or your favourite audio application. Osculatrix does not want your money and it doesn't want your data. It is 100% free. No ads, no in-app purchases, no subscriptions, no surveillance, no nag screens.
C.ARP
This app offers a unique approach to music creation, inspired by vintage instruments. It allows users to play chords and melodies with intuitive touch controls, apply real-time audio effects, and utilize a dynamic rhythm section. Advanced features include sampling, MIDI output via Bluetooth, and an iPad-optimized interface.
- Chord and melody playing
- Real-time audio effects
- Dynamic rhythm section
- Sampling and looping
- MIDI output via Bluetooth
- iPad optimized interface
- In-app tutorial
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C.ARP is a totally different keyboard. Inspired by old keyboards, omnichords and tape effects, it lets you play chords and melodies as well. Its design makes everything easier for a musician who just wants to play on mobile. Just hold on a button and then swipe or tap on the right section. But if you prefer, you can access chords and notes directly on the notes grid. Pitch them, harmonize, use mod wheel and apply real-time audio effects too. Rhythm section follows you every chord you choose: pick up the style you prefer, adjust BPMs, mute other instrument, change different midi settings, change drums and play them with drum pads. Do arpeggios with different sounds and rhythmic fractions, create different sound environments with delay, reverb and rotation. The design has also been updated for iPads, so you can enjoy the buttons and sections rearranged for the screen size. Record your voice or everything else as a sample, adjust its length, reverse or loop it, make chords and melodies with it and explore other cool features on this 4th version. There's also a tutorial inside! And finally: we added bluetooth out. It means you can connect your iPhone to your Mac and send midi notes right in your preferred DAW. Just follow the guide inside. Thanks to everyone who helped me: Giacomo, Virginia, Mattia, Andrea, Giulia, Cristiano, and the others. Thanks to the masters Suriani, Frankie and Calcutta. For every question or suggestion don't hesitate to write to me
Screenshots
Verdict
The clearest difference is price: Osculatrix at Free against C.ARP's $9.99. Osculatrix also leads on rating (5.0 vs 4.3) and review sentiment (100% vs 74%). C.ARP's advantage is ratings volume (114 vs 7) and iOS requirement (13.0 vs 15.0). On update cadence, ads, in-app purchases and monetization model 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
Osculatrix is free to download; C.ARP costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Osculatrix holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: C.ARP has 114 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 100% of Osculatrix's written reviews are positive against 74% of C.ARP's.
Osculatrix ships an update monthly, C.ARP every 4 weeks. The most recent releases landed on June 22, 2026 and September 22, 2026 respectively.
| Parameter | Osculatrix | C.ARP |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 5.0 (7 ratings) — better | 4.3 (114 ratings) |
| Positive reviews | 100.0% of reviews — better | 74.3% of reviews |
| Number of ratings | 7 | 114 — better |
| Update frequency | Monthly | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 2 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthew Caldwell | Paolo Giorgi |
Customer experience
Osculatrix
C.ARP
Bugs and requests
Osculatrix
Not enough reviews yet to summarise bugs or requests.
C.ARP
Reported bugs
40 issues- Sound doesn't work
- No sound
- App crashes when opening
- App crashes when trying to open
- App auto-quits on start
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- Chord panel smaller after update
- System setting always out
- App crashes after using only once
- App crashes when pressing a button
- MIDI Send is broken
- Can't open the app on Mac
- Can't close the menu
- App crashes if sample button is pressed
- Sample button crashes the app
- Strumming doesn't work
- App crashes when sample or reverse is pressed
- App is not stable / crashy
- Sampling function is DOA
- Sampler doesn't work / crashes
- Crash problem
- Send midi function greyed out
- App crashes when pressing the red sample button
- Sampler crashes the app 100%
- App crashes when attempting to use record feature
- Sample button keeps crashing the app
- Record, loop, or reverse buttons cause crash
- Bugs related to recording/sampling
- Sampler may crash
- Audio panel covers gear button
- E chord is extremely low octave and sounds muddled
- App crashes when trying to start an audio recording
- Certain audio glitches with recording and looping
- Buttons crash the app
- App crashes when pressing the sample button
- Sample and reverse buttons crash the app
- MIDI out doesn't seem to work
- Latency is a killer
- Chord doesn't trigger if not hit perfectly
- Sliding finger doesn't sound chord
- Sound can be tinny/harsh
Requested features
18 requests- Rearrange layout to be chromatic
- AUV3 support
- Inter-app-audio / GarageBand integration
- MIDI out functionality
- Save last state
Show 13 moreShow fewer
- Contextual help menus
- More sound design options
- Make it an Auv3 midi controller
- Support iPad
- Add "midi out" option
- Make it an audio app extension for GarageBand
- Add a way to use this app as a Bluetooth midi controller
- Add a visual distinction for individual buttons
- Add velocity on the strum bar
- Allow autoplay chord to hold like a drone
- Transpose reverb of strummed notes
- Add midi connectivity with external devices and other apps
- Add custom colors for themes
In-app purchases
Osculatrix
No in-app purchases
C.ARP
No in-app purchases





