Otto vs BackPlay
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Otto
Easily record and reverse any sound, from your voice to music. Participate in viral challenges, create funny backward speech, or experiment with unique audio effects. Save and share your creations instantly.
- Instant reverse playback
- Backwards voice recording
- Save and share reversed audio
- High-quality sound processing
- Simple and intuitive interface
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Otto turns your voice into something worth sharing. Record, flip it backwards, drop an effect on it, then send it out as a video. The name reads the same backwards, and so does everything you make here. SHARE IT AS A VIDEO Audio files go nowhere on social apps. Otto renders your recording as a vertical video with an animated waveform and your own caption, sized for TikTok, Reels and Shorts. Save it to Photos or share it straight from the app. ELEVEN VOICE EFFECTS Reverse is where it started. Now you also get Slowed for that late night sound, Chipmunk, Demon, Whisper, Robot, Phone, Megaphone, Underwater, Glitch and Cave. Record once and try every one of them on the same take. ASMR BACKGROUNDS Layer a soft sound under your voice: rain, white noise, keyboard clicks, tapping, brushing, paper crinkle, fireplace, wind or a slow heartbeat. Set how much of it you want with one slider. Pair it with Whisper and you have an ASMR clip in seconds. THE BACKWARDS CHALLENGE Read a phrase out loud. Otto plays it backwards. Now try to copy that sound. Otto reverses your attempt and puts it next to the original, then scores how close you got. Bring a friend, it gets worse for both of you. WHAT IT IS GOOD FOR Reverse singing and say it backwards clips Funny voice messages your friends will replay ASMR and whisper content with a background you choose Sound effects for videos and music Finding out what a laugh or a sneeze sounds like in reverse FREE AND PRO Free gives you recording, four effects, three ASMR backgrounds, full length playback with nothing cut short, the challenge, and video export with a small watermark. Pro removes the watermark and unlocks the remaining effects and ASMR backgrounds. That is the whole difference. Everything runs on your device. No account, no sign up, and it works with no connection. Contact: ugur@synappsai.com Terms: https://www.synappsai.com/terms-of-use Privacy: https://www.synappsai.com/privacy-policy
BackPlay
Record any sound, then instantly reverse it to hear how it sounds backward. Easily share your creations with friends or on social media. Experience audio in a fun, new way with a simple interface.
- Record audio
- Reverse sound instantly
- Live waveform display
- Export original or reversed audio
- Share creations
- Simple and easy to use
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Record & Flip in seconds. Curious how your voice sounds backward? BackPlay lets you grab any sound, reverse it, and share the fun. How it works: - Record sound using your phone’s mic—chat, sing. - Listen in original or reversed mode while the live waveform dances. Highlights: - Crisp, high-quality audio recording. - Instantly reverse your voice or any sounds. - Export whichever version you like and share it with anyone or on social platforms. - Simple design and easy to use, start anytime. Tap record, flip your sound, and hear the world inside out. Privacy Policy: https://www.freeprivacypolicy.com/live/50327b77-61eb-49c7-a16f-0d1d2a302286 Terms of Use: https://www.freeprivacypolicy.com/live/43f777a1-827e-432f-8c7c-10316e41963c
Screenshots
Verdict
The clearest difference is rating: Otto at 5.0 against BackPlay's 4.4. BackPlay's advantage is ratings volume (16 vs 2). On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Otto sells 3 in-app purchases, starting at $3.99 per 7 days and BackPlay sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Otto holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: BackPlay has 16 ratings behind it against 2, so its average is the more settled of the two.
Otto ships an update every 3 weeks, BackPlay every 2 weeks. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.
| Parameter | Otto | BackPlay |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.4 (16 ratings) |
| Number of ratings | 2 | 16 — better |
| Update frequency | Every 3 weeks | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 12 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | SYNAPPS AI LTD | 琳 陆 |
Customer experience
Otto
BackPlay
In-app purchases
Otto
- Reverse Singing Pro$3.997 Days
- Reverse Singing Pro$9.991 Month
- Reverse Singing Pro$39.991 Year
BackPlay
- BackPlay Lifetime PRO$3.99









