Kritus
Real music ability, by ear
Free · In-App Purchases · Designed for iPad. Not verified for macOS.
Real musical ability lives in your ears, not on a page. No theory, no sheet music — just hear it and find it on your instrument.
Real musical ability lives in your ears — not on a page.
Kritus is not music theory, and it is not lessons. It doesn't ask you to read, memorize, or recite. It trains the one thing every musician actually runs on — the ear. You hear a note, a chord, or a phrase, then find it on your instrument by sound alone.
NO BACKGROUND NEEDED — AND NO WAY AROUND IT
You don't need to read music. You don't need theory, or years behind you. But if you want to truly hear — to play what you imagine, pick out the music you love, and find your way through any song — there is only one path, and your ears have to walk it. Kritus is that path, from your very first note.
PUT THE PAGE AWAY
No sheet music. No fretboard diagrams. No keyboard maps. Kritus never shows you where to put your fingers, because reading the answer is not the same as hearing it. You listen, you search for it on your instrument, and you play it back — the microphone checks what you played, entirely on your device.
WHAT YOU'LL PRACTICE
- Single notes, intervals, chords, phrases, and full chord progressions.
- Chords that open up: when one is hard to hear, its voices gradually separate so you can catch each on its own, then settle back into a single sound.
- The River, which carries you through everything in the order real music actually uses it — practice and review woven together, always moving.
- Guitar or piano, with reference sounds recorded from real instruments. A built-in guitar tuner, too.
PRIVATE BY DESIGN
Microphone audio is analyzed on your device in real time and immediately discarded — never recorded, saved, or uploaded. No accounts, no ads, no analytics.
SUBSCRIPTION
Kritus Serious User unlocks the whole app after a 7-day free trial:
- Monthly — $8.99 / month
- Annual — $49.99 / year
Payment is charged to your Apple ID at confirmation and shown in your local currency. The subscription renews automatically at the price shown unless cancelled at least 24 hours before the current period ends. Manage or cancel anytime in your App Store account settings.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://kritus.marcuslabs.ai/privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Mi Lin, 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
- Mi Lin
- Size
- 138.5 MB
- Category
- Music
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Kritus Serious User (Annual) $69.99
- Kritus Serious User (Monthly) $11.99
- Copyright
- © 2026 MarcusLabs