In-depth vocal analysis
Every take measured — accuracy in cents, vibrato in hertz, onset in milliseconds — feeding a voiceprint that tracks your deltas.
Cents, not starsVibrato: 5.6 Hz · ±26¢Onset: scoops ~180 ms
See your voice.
A 60-second mirror for your singing — range, accuracy, steadiness — analyzed entirely in your browser. Then train exactly where you miss, with a community chasing the same note as you.
No account. Nothing uploaded. Nobody hears you but you.
Aria · Blaze · Flux · Luna · Glint · Echo — six practice voices, pick your timbre
±1¢
Detection precision
11
Ways to play
0
Audio uploads
6
Voice characters
The Voice Mirror
Meet your voiceprint.
Sing three short tasks — a glide, a hold, a match. Sixty seconds later you're looking at your voiceprint: your range as the headline, your accuracy in cents, your steadiness as a star-map card you can share.
Mic check first Works on iPhone Saved on-device
Come back next week and it tells you the difference: “+2 semitones since last time.”
MERCURYPITCH · VOICEPRINT This week
G2 – E5 2 octaves + 9 semitones ▲ +2 semitones since last time
- Accuracy
- ±12¢ median
- Steadiness
- ±9¢ on holds
- Vibrato
- 5.6 Hz · ±26¢
- Onset
- scoops ~180 ms
Voice Mirror · analyzed on-device
This is what singing looks like
Watch your pitch land, in real time.
This panel runs the real engine. Press ▶ Play and sing — your voice draws the line, and every note tells you how close you landed. Then flip to Piano or Karaoke and play those too.
C Major LIVE MIC
Accuracy
Perfect0
Excellent0
Good3
Okay4
Off1
Voice
Aria
piano
● LIVEPerfect 0 · Good 3 · Okay 4 · Off 1Score 53%
C Major Scale · 6 notes0 / 6Ready
Sing along 4 stems
01:24
staring at the ceiling counting time
every note I miss, I leave behind
your voice keeps pulling me back home
Vocals
SM
Drums
SM
Bass
SM
Other
SM
● 01:24 / 03:48UVR-MDX-NET · 4 stemssynced lyrics on
That was your voice, analyzed on this page — nothing was uploaded. Get the full 60-second Mirror →
midnight-drive.flac Key: A → B (bridge) 94
Vocals you take this line
Drums
Bass
Other
we were chasing taillights out of town
every mile a note I couldn't hold
now the radio is singing back to me
Karaoke, from your own library
Any song is your songbook.
Other apps sell you a library. MercuryPitch turns yours into one. Drop in any track — the vocal and instruments separate on your device, lyrics sync word by word, and the vocal line becomes notes you can see, edit, and sing against with live scoring. Key detected per section, even when the song changes key.
Free on-device separation Synced lyrics Editable vocal line Per-section key detection
Your path
Progress you can hear.
No lectures. You sing, you score, you level up — and the app quietly steers you toward the notes you keep missing.
LEVEL 01
Match a note
Pick a key, sing it, watch the bar turn green. That's the whole loop — and it's instantly satisfying.
LEVEL 02
Run a scale
Step through major and minor scales with a moving target and a count-in metronome.
LEVEL 03 · NOW
Beat your weak spots
Focus Mode reads your history and builds drills around the intervals you struggle with.
LEVEL 04
Take on the world
Enter weekly challenges, climb the leaderboard, and jam live with other singers.
The community
You're never practicing alone.
Share melodies, race the leaderboard, and take challenges that refresh every week. Practice sticks when other people are in it with you.
Weekly leaderboard
Live 01lunar_lark
14-day streak98.4%
lunar_lark14-day streak98.4%
02aria_sings
9-day streak96.1%
aria_sings9-day streak96.1%
03perfect5th
21-day streak95.7%
perfect5th21-day streak95.7%
04flux_capacitor
3-day streak93.0%
flux_capacitor3-day streak93.0%
05echo_chamber
6-day streak91.8%
echo_chamber6-day streak91.8%
Inside the Voice Mirror
Sing the Universe.
Some melodies here weren't written — they were measured. Sing Orion's stars by their positions in the sky. Match five famous pulsars by their spin rates. Hold the Perseus black hole's B♭. Real cosmic data, fitted to your range, scored like everything else.
Five pulsars, five tempos
- Geminga4.2 Hz
- Vela11.2 Hz
- Crab29.9 Hz
- PSR B1937+21642 Hz
- PSR J1748−2446ad716 Hz
The Perseus black hole
Hums a B♭ — 57 octaves below middle C. We bring it up into your range. You hold it. We score the hold.
These live inside the Voice Mirror. Sing the sky in 60 seconds →
Everything in the box
The whole studio.
Every mode scored by the same on-device engine.
Voice exercises
Warm up with glides, holds, and matches fitted to your range — sub-cent tracking while you sing.
Fitted to your rangeOnce, Repeat, cyclic modesSub-cent tracking
Focus Mode & trends
Practice that reads your history: drills built from the notes you miss, at a difficulty that follows your last ten scores.
Drills your missed notesAdapts to last 10 scoresWeekly trends
Piano practice
Put a keyboard on screen and follow the falling notes — every key you hit scored by the same engine.
Falling-note viewMIDI keyboard inScored per note
Guitar practice
Point the mic at your guitar: tuning, riffs, and chords tracked string by string, scored in cents.
Tuner built inRiffs & chordsWorks acoustic or amped
Any song, separated
Drop in any track, split it on your device, mute the vocal and take its place — lyrics synced on screen.
On-device separationSynced lyricsPer-section key detection
Compose & share
Sketch a melody on the piano roll, record a take, dial between “As sung” and “Clean”, and send it as a link.
As sung ↔ CleanMIDI in & outShare as URL — no account
Challenges
Timed pitch challenges against the clock and the leaderboard — share a round as a link, no account wall.
Timed roundsLeaderboardShare with a link
Jam together
Invite someone into your session and play in real time — audio flows between you two over WebRTC, never through a server.
Real-timePeer-to-peerNo server in the path
Why it's free
A community can't grow behind a paywall.
So everything that runs on your device — practice, composing, analysis, jamming, every challenge — is free. The only thing we charge for is advanced stem separation — it's compute-heavy, so we price it at cost. That's the deal.
Free on-device Open source · AGPL-3.0 Private by default Compute at cost
Questions
Before you join.
Is it really free, or free-with-a-catch?
Genuinely free. Everything client-side — practice, composing, analysis, jam, community, challenges — costs nothing. The only paid
feature is advanced stem separation, which is compute-heavy, so we price it at cost.
Is my voice private?
Pitch detection runs entirely in your browser, so your mic audio never leaves your device.
I can't sing yet — is this for me?
Especially. The Mirror isn't a test you pass — it's a baseline. Nobody hears you but you, and every session after it aims at the
exact notes you miss, so beginners improve fastest.
Do I need an account to join the community?
You can practice instantly with no account. A profile lets you appear on the leaderboard, save streaks, and enter challenges.
Can I sing with friends?
Yes — the Jam mode connects you peer-to-peer over WebRTC for low-latency, real-time sessions.
What are the six characters?
Aria, Blaze, Flux, Luna, Glint and Echo — playback voices, each mapped to its own instrument (piano, synth, organ, strings, sine and
a mellow piano). Pick the timbre you like to practice against.
Join in
Add your voice to the chorus.
The Mirror takes 60 seconds, alone with your browser. Everything it starts — the practice, the challenges, the leaderboard — is where the community picks you up.