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
Private browser karaoke and singing practice
See your voice. Take the stage.
Meet your voice in 60 seconds, then turn a song you own into karaoke with synced lyrics and live pitch scoring. Nothing to install. No account to start.
- Pitch analysis stays on your device
- Real pitch feedback, not a generated result
- Free and open source
Karaoke Night
A song you own becomes a stage that can hear you.
Vocals lift away on your device. Lyrics follow the song. Your microphone draws every note in real time—so a fun first take can become a better second one.
Core stage
The song is already waiting.
Open Karaoke Night and the licensed opener is cued. One click brings in synchronized lyrics, a live pitch lane, and the score that makes the next take worth trying.
No account is required for the prepared song. Bring a song you own when you are ready.
Sing on Karaoke Night → 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 later and the Mirror shows how your range changed. Example: “+2 semitones since last time.”
Jam Rooms
One room. One song. Every voice gets a lane.
Bring up to 12 singers into a shared karaoke room. The host guides the song, assigns lines, and sets the scene; everyone follows the same lyrics and sees their own live pitch.
Room editions
Set the room. Share the atmosphere.
A supporter host chooses the scene; every guest gets the same view.
Live Room · 1 of 6 Drag sideways or swipe to explore
Support the studio Active supporter status unlocks room editions as they ship. Guests join and sing with the full room experience.
See supporter perks 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 a living line across the staff, and every note tells you how close you landed — green when you nail it, amber when you’re close, red when you drift. 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 / 03:484 stems · separated on-devicesynced lyrics on
That was your voice, analyzed on this page — nothing was uploaded. Get the full 60-second Mirror →
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 01
lunar_lark
14-day streak98.4%
lunar_lark14-day streak98.4%
02aria_sings
9-day streak96.1%
aria_sings9-day streak96.1%
03
perfect5th
21-day streak95.7%
perfect5th21-day streak95.7%
04
flux_capacitor
3-day streak93.0%
flux_capacitor3-day streak93.0%
05
echo_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 a track you own, 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 note by note, 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
Bring up to 12 singers into a shared karaoke session. Voice connects directly between singers whenever your networks allow it.
Shared karaokeUp to 12 singersDirect voice where possible
Why it's free
A community can't grow behind a paywall.
So the singing loop stays open: Voice Mirror, practice, on-device analysis, Karaoke Night, Jam Rooms, and challenges are free. Supporter room editions fund the studio without putting participation behind a paywall; compute-heavy cloud processing is priced separately at cost.
Free on-device Open source · AGPL-3.0 Private by default Supporter style, not access
Questions
Before you join.
Is it really free, or free-with-a-catch?
Genuinely free. Voice Mirror, practice, on-device analysis, Karaoke Night, Jam Rooms, community, and challenges are available
without a subscription. Supporters can unlock premium room editions and help fund the studio; advanced cloud processing is priced
separately because it uses real compute.
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. Jam Rooms bring up to 12 singers into a shared session with synchronized karaoke lyrics, singer assignments, and live pitch
lanes. Voice connects directly between singers where network topology permits.
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.
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.
Get the occasional update
New features, community challenges, and singing tips — a few times a year, nothing more.
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