HOW TO PLAY
Listen, choose, attack
Each round plays a single note, a short phrase, or a chord. Every choice sounds as you pick it, with no limit on how often, so you can compare candidates against what you heard. Nothing is graded until you finish the phrase and confirm.
Enharmonics count as the same note
C♯ and D♭ are judged as the same pitch, so you never lose points for hearing correctly but answering with the other spelling.
Replay the question
Missed the question itself? Tap Replay mid-answer to hear it again — once per question, twice with Pro.
Randomized every time
The same stage generates different questions on every run, so it stays a listening game rather than a memory test.
CURRICULUM
60 stages, 6 chapters of graded difficulty
The chapter order doubles as an ear-training curriculum. The first three chapters build single-note listening; the last three move to chords. Ten stages per chapter, with difficulty climbing one small step at a time.
Dark Note
- Range
- C4–C5
- Skill
- Single notes, white keys only
Bone Cantata
- Range
- C4–C5
- Skill
- Single notes with sharps and flats
Crimson Nine-Tails
- Range
- C3–C6
- Skill
- Wider range and octave discrimination
Lionlord Forte
- Range
- C2–C7
- Skill
- Two-note intervals, white keys
Glitch Jester
- Range
- C2–C7
- Skill
- Two-note intervals with black keys
Requiem of the Fallen
- Range
- C2–C7
- Skill
- Full triads
PRACTICE & COLLECTION
Practice mode and things to chase
WHY I MADE THIS
Where it started
It began with a scene on television: someone held a telephone handset to their mouth and dialed a number by producing the tones with perfect pitch. It stayed with me.
From then on I found myself curious about perfect pitch —
even though I had never paid much attention to my own ear.
So I set out to build something that would train it while being genuinely fun to play.
That became Sound Slayer.
Built by one person — Metalels Studio
DESIGN
Decisions behind the game
Not a memory test
Questions are regenerated on every run. A stage stores only the conditions — range, note types, phrase length, question count — never the questions themselves.
A slip is not a loss
Grading happens per note, but confirmation happens per phrase. Nothing is scored until you finish the phrase and confirm, so you can revise as you go.
Hearing right is being right
Enharmonic spellings are treated as the same pitch, so answering with the "other" name never costs you a point.
UNDER THE HOOD
How it is built
Zero third-party SDKs
No advertising, analytics, or crash-reporting SDKs are bundled — none at all. The app is plain Swift and SwiftUI with no package dependencies.
Notes synthesized at runtime
There are no piano samples. Tones are synthesized from waveforms using Accelerate. Because the review step plays the correct pitch and your answer at the same time, each is given a different harmonic brightness and stereo position so they stay distinguishable. Sound effects are synthesized too.
No data collection
No account is required and nothing is sent to a server. Progress is backed up to your own iCloud, and you restore it manually from Settings.
Works fully offline
Every feature runs without a connection. Signing in to Game Center is optional.
PRO
About Pro
The free version uses a stamina system (5 max, one point refilling every 3 hours) for stage attempts.
Practice mode is always free and unlimited.
- ✦ Unlimited stamina
- ✦ A second Replay per question
- ✦ One-time purchase, not a subscription
- ✦ Includes all content added in future updates
- ✦ If ads are ever added, Pro will never show them
ROADMAP
Major updates are in the works
Release day is not the finish line. More stages from chapter 7 onward, along with multiplayer content, are in planning. With the one-time Pro purchase, that content comes included.
Planned features and timing are subject to change.
Train your ear by playing a game.
No musical background required. For iPhone and iPad, iOS 18 or later.