Sing it backwards. See your score. Beat your friends.
Flipvox is the reverse audio app built for the reverse singing challenge. Record your voice, hear it backwards instantly, imitate what you hear and get a 0–100 similarity score.
- Free to play
- No account
- Audio stays on your phone
Everything you need to sing backwards
One app for reversing your voice, practicing backwards singing and turning it into a game.
Reverse audio in one tap
Record, and your voice plays backwards instantly. Change the speed from 0.5× to 2×, shift the pitch by up to 12 semitones and loop the tricky part.
Similarity score, 0 to 100
Imitate the reversed audio, let Flipvox reverse your attempt and see how close it gets to the original. Stars and playful comments included.
Party mode for 2–8 players
Pass the phone around, take turns on the same phrase and crown the winner on a local scoreboard. No sign-ups, no internet.
Reverse video for TikTok and Reels
Film a vertical video with your voice reversed, then export and share it with the score on screen.
Voice effects studio
Chipmunk, robot, alien, echo, reverb and more. Add an effect to any recording and save it as a new version.
Private and offline
Reversing, effects and scoring run on your phone. Your recordings are never uploaded, and there is no account to create.
How the reverse singing challenge works
Record
Say or sing a phrase, or pick one from the built-in phrase library.
Listen backwards
Flipvox reverses it right away. Replay it slowly until you can hear every sound.
Imitate and score
Sing the backwards version, let the app flip it again and compare it to your original.
Tap to record
Your voice stays on your phone
Flipvox has no servers and no accounts. Recordings, imports and scores are stored on your device only, and the similarity score is calculated there too.
Read the privacy policyFrequently asked questions
Is Flipvox free?
Yes. You can record, reverse and play the challenge for free, with ads kept light. Premium removes all ads and unlocks every effect, phrase pack, longer recordings and watermark-free video.
How does the reverse singing challenge work?
You hear a phrase played backwards, imitate it as closely as you can, and the app reverses your imitation so you can compare it with the original. The closer it sounds, the higher your score.
How is the similarity score calculated?
On your device, using speech analysis (MFCC features) and dynamic time warping to compare your attempt with the original. The score is meant for fun, not as a measure of singing ability.
Are my recordings uploaded anywhere?
No. Audio and video stay on your phone. They only leave it when you choose to share or export them yourself.
Do I need an account or an internet connection?
No account is needed and recording, reversing and scoring work offline. Ads and purchases need a connection when they load.
Can I import my own audio or video?
Yes. Import audio files or the sound of a video, reverse it and export it as audio or as a video ready for TikTok, Instagram and WhatsApp.
Ready to hear yourself backwards?
Download Flipvox and start your first reverse singing challenge in seconds.