SUS4 Recorder: Key & BPM
Record a take, see its key
Free · In‑App Purchases
Record a take and see its tempo, with a key and chord estimate. Search your library by key or chord. Recordings stay on your phone.
Record a take and see its tempo, with an estimate of its key and chord.
Search your recordings by name, key or chord, so you can find that riff in D later.
Fully on-device: no cloud, no account.
Press record for rehearsals, lessons and ideas. The newest take gets a card with its key, BPM and chord. Add reverb or EQ on playback without changing the original, then share it.
• Records at 48 kHz
• Tempo detection with a key and chord estimate
• Reverb and 3-band EQ on playback, non-destructive
• Library with search by name, key or chord
• WAV export, share by AirDrop, Files or any app
For musicians recording rehearsals and lessons, and songwriters who want their ideas labeled.
Everyone gets five recordings a day. Pro, or SUS4 All-Access across the whole range, removes the daily limit and adds seven more reverbs, chorus, a compressor, drive and M4A export.
Made in the UK by working musicians.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
SUS4 now speaks your language: the app is available in 50 languages.
Any lifetime purchase now unlocks every SUS4 app.
A clearer upgrade screen, plus fixes and polish throughout.
The developer, ThePaulSmith, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Paul Smith
- Size
- 30.1 MB
- Category
- Music
- Compatibility
Requires iOS 16.0 or later.
- iPhone
Requires iOS 16.0 or later. - iPad
Requires iPadOS 16.0 or later. - Mac
Requires macOS 13.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
English and 43 more
- English, Arabic, Bengali, Catalan, Croatian, Czech, Danish, Dutch, Finnish, French, German, Greek, Gujarati, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kannada, Korean, Malay, Malayalam, Marathi, Norwegian Bokmål, Oriya, Polish, Portuguese, Punjabi, Romanian, Russian, Simplified Chinese, Slovak, Slovenian, Spanish, Swedish, Tamil, Telugu, Thai, Traditional Chinese, Turkish, Ukrainian, Urdu, Vietnamese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- SUS4 Recorder Lifetime $59.99
- SUS4 All-Access $4.99
- SUS4 Recorder Pro Monthly $0.99
- Copyright
- © 2026 4chords Studios