# Otto: Reverse Audio & ASMR — Voice Changer & Whisper Sounds > App to record, flip, and play audio in reverse. (iPhone/iPad app by SYNAPPS AI LTD.) - Source: https://appshunter.io/ios/app/otto-reverse-audio-and-asmr/id6752802267 (this page in markdown: same URL + `.md`) - Developer: [SYNAPPS AI LTD](https://appshunter.io/developer/1839176304) - Category: Music - Price: Free with in-app purchases - Rating: 5.00/5 from 2 App Store ratings - Age rating: 4+ - Requires: iOS 17.0 · 12 MB - Languages: American English - Released: 2025-09-20 - Data updated: 2026-09-25 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/otto-reverse-audio-and-asmr/id6752802267/reviews.md ## What is Otto? 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 ## Key features - Instant reverse playback - Backwards voice recording - Save and share reversed audio - High-quality sound processing - Simple and intuitive interface ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Reverse Singing Pro | $5.99 | per 7 days | | Reverse Singing Pro | $9.99 | per month | | Reverse Singing Pro | $39.99 | per year | ## Frequently asked questions about Otto ### What is Reverse Singing? Reverse Singing is an application that allows you to record audio and play it back in reverse. You can use it for the reverse singing challenge, to say phrases backwards, or for creative sound effects. ### Can I use Reverse Singing offline? The provided data does not specify offline functionality. However, recording and reversing audio typically requires processing power that may or may not be available without an internet connection. ### How does the reverse singing challenge work? The reverse singing challenge involves recording yourself singing a song and then playing it backwards. This app allows you to easily record your singing and then reverse the audio to participate in this trend. ### What devices is Reverse Singing available on? Reverse Singing is available on iPhone and iPod devices. It is compatible with iOS versions suitable for the '4+' age rating. ### Does Reverse Singing have ads? No, Reverse Singing does not contain advertisements. The app is free to download and use, with optional in-app purchases for premium features. ### What are the subscription options for Reverse Singing Pro? Reverse Singing Pro offers several subscription plans: a 7-day free trial followed by $5.99 weekly, $9.99 monthly, or $39.99 annually. These plans likely unlock advanced features or remove limitations. ### How often is Reverse Singing updated? Reverse Singing was last updated on October 19, 2025, with version 1.2 released on September 20, 2025. This indicates a relatively recent update, suggesting ongoing development and support. ### What is the age rating for Reverse Singing? Reverse Singing has an age rating of 4+. This means it is considered suitable for children and general audiences, with no mature content expected. ## Version history (last 5 releases) ### 2.1 — 2026-09-24 The app is now called Otto, and it does a lot more than reverse. YOUR RECORDING CAN LEAVE AS A VIDEO Render any recording as a vertical video with an animated waveform and your own caption, then save it to Photos or share it. Audio files were never accepted by social apps, so this was the missing piece. TEN NEW VOICE EFFECTS Slowed, Chipmunk, Demon, Whisper, Robot, Phone, Megaphone, Underwater, Glitch and Cave now sit next to Reverse. Record once and try them all on the same take. ASMR BACKGROUNDS Put a soft sound under your voice and set the level yourself. Rain, white noise, keyboard, tapping, brushing, paper crinkle, fireplace, wind and heartbeat. THE BACKWARDS CHALLENGE Read a phrase, hear it backwards, then try to say the backwards version. Otto reverses your attempt and scores how close you got. FREE PLAYBACK IS NO LONGER CUT SHORT You can hear and share your full recording without paying. Pro now covers the watermark and the extra effects and backgrounds. ### 2.0 — 2026-09-09 This update is a full rebuild. The app opens faster and uses less space. The subscription screen is now simpler and easier to read. Bug fixes and stability improvements. ### 1.2 — 2025-10-19 improvements ### 1.1 — 2025-09-25 bug fix ### 1.0 — 2025-09-20 No release notes. ## More apps by SYNAPPS AI LTD - [PDF Document Scanner Converter](https://appshunter.io/ios/app/pdf-document-scanner-converter/id6752381433) - [FAX from iPhone • Send FAX](https://appshunter.io/ios/app/fax-from-iphone-send-fax/id6752542787) - [Invoice Maker + Generator](https://appshunter.io/ios/app/invoice-maker-plus-generator/id6753730380) - [White Noise • Sleep Sounds](https://appshunter.io/ios/app/white-noise-sleep-sounds/id6754519703) - [Passport Photo Maker - ID Visa](https://appshunter.io/ios/app/passport-photo-maker-id-visa/id6754534335) All apps by SYNAPPS AI LTD: https://appshunter.io/developer/1839176304 ## Related topics [reverse audio play](https://appshunter.io/ios/topics/reverse-audio-play) · [play backwards](https://appshunter.io/ios/topics/play-backwards) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-25.*