# Sleep Ninja > Evidence-based sleep improvement strategies for young people. (iPhone/iPad app by Black Dog Institute.) - Source: https://appshunter.io/ios/app/sleep-ninja/id1667400428 (this page in markdown: same URL + `.md`) - Developer: [Black Dog Institute](https://appshunter.io/developer/336288119) - Category: Health & Fitness, Lifestyle - Price: Free - Rating: 3.11/5 from 35 App Store ratings · 10 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 66 MB - Languages: American English - Released: 2023-02-07 - Data updated: 2026-08-20 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/sleep-ninja/id1667400428/reviews.md ## What is Sleep Ninja? Sleep Ninja is a Black Dog Institute created app providing evidence-based strategies to help young people improve their sleep. For more information, please contact sleep@blackdog.org.au ## Key features - Evidence-based sleep strategies - Aimed at young people - Developed by Black Dog Institute - Focus on improving sleep ## Recent user reviews (10 of 10) All indexed reviews: https://appshunter.io/ios/app/sleep-ninja/id1667400428/reviews.md ### 1/5 — Don‘t get it *2026-05-29* It worked….. For the first two weeks the it stopped working and is now stuck on the home page. Genuinely disappointed. **Developer response:** Hi there, Sorry to hear that you are experiencing some difficulty with the app. We really appreciate you letting us know. We recently released a new version of the app, so updating the app should fix this issue. If the problem continues, please reach out to us via email at sleep@blackdog.org.au and we can help you. ### 1/5 — App won't open. *2026-05-07* I just downloaded it, and it won't open at all? I've reinstalled twice, same thing. And I've restarted my phone, checked for phone updates.. Nothing works? **Developer response:** Hi Tokomiiii, Sorry to hear that you are experiencing some difficulty opening the app. We really appreciate you letting us know. Please reach out to us via email at sleep@blackdog.org.au and we will help you to resolve this issue. ### 1/5 — Not teen/adult friendly *2026-04-12* It uses writing only for a very long time when you sign up. People want to play with apps and listen to sleep meditation stories, but this app makes you read lots of writing without many animations and forces you to do “training” rather than fun and helpful sleep activities. It’s really boring and wouldn’t appeal to teens. **Developer response:** Hi there, Thanks so much for reaching out and we’re sorry to hear that you find the app too text-heavy. The training is designed to build lasting improvements to users’ sleep habits that continue to help over time. If this isn’t what you’re looking for – we do have a meditation track in the ‘More’ section of the app! ### 1/5 — Won’t let me open! *2025-12-02* I tried using this app and it won’t let me open it, as soon as I click it immediately sends me out, I delete and re-download AND reset my phone. ### 3/5 — Help please *2025-11-19* Every morning it says I have to go to bed! So I can’t track my sleep or level up **Developer response:** Hi there, Sorry to hear that you are experiencing some difficulty with the app. We really appreciate you letting us know. We recently released a new version of the app which has fixed this problem, so updating the app should fix this issue. If the problem continues, please reach out to us via email at sleep@blackdog.org.au and we can help you. ### 1/5 — can’t even log in *2025-05-03* wont let me put in my phone number - I left out the area code, put it in, spaces, everything but it said it wasn’t valid. ### 2/5 — App won’t open *2025-03-15* We got through session 1 and tracked two times before the app just started working - it wont even open. Tried downloading it on our iPad and it’s not opening on that either. My daughter was enjoying using the app together so this is disappointing. ### 1/5 — Time waste. *2024-09-17* It’s a Great way to irritate someone. ### 1/5 — Won’t work *2024-02-03* It’s asking me for me phone number but it won’t let me put in my last digit. **Developer response:** Hi there, sorry to hear there has been a problem with registering for Sleep Ninja. When entering your phone number, please leave out the country code (61) and you will be able to put in your full number. ### 5/5 — 1 *2023-09-30* 1 ## Frequently asked questions about Sleep Ninja ### What is Sleep Ninja? Sleep Ninja is an app created by the Black Dog Institute that offers evidence-based strategies to help young people improve their sleep. ### Who developed Sleep Ninja? Sleep Ninja was developed by the Black Dog Institute, an organization focused on mental health research and support. ### What age group is Sleep Ninja for? Sleep Ninja is designed for young people and has an age rating of 4+. ### What devices does Sleep Ninja support? Sleep Ninja is currently supported on iPhone devices. ### How often is Sleep Ninja updated? The latest version of Sleep Ninja is 1.2.1, and it was last updated on August 13, 2026. The app was initially released on February 7, 2023. ### What is the user rating for Sleep Ninja? Sleep Ninja has a user rating of 3.1 stars based on 35 ratings. ### Does Sleep Ninja have ads? No, Sleep Ninja does not contain advertisements. ### Are there in-app purchases in Sleep Ninja? No, Sleep Ninja does not feature any in-app purchases. ## Version history (last 5 releases) ### 1.2.1 — 2026-08-13 We’ve made Sleep Ninja more reliable. - Fixed a crash on the Track tab - General stability improvements ### 1.2.0 — 2026-05-12 • Updated check-in questionnaires with reminders to track your progress • Retake completed training sessions any time • Belt progression simplified, no lesson completion required • Personalised wake-up notifications based on your belt level • Research consent and updated terms & conditions • "What's New" screen • Bug fixes and performance improvements ### 1.1.0 — 2025-11-06 Improved App Stability Better compatibility with newer iOS devices ### 1.0.6 — 2024-01-22 Minor bug fixes and feature enhancements ### 1.0.5 — 2023-12-13 Minor bug fixes. ## More apps by Black Dog Institute - [HeadGear](https://appshunter.io/ios/app/headgear/id1160049475) - [Anchored](https://appshunter.io/ios/app/anchored/id1482352205) - [LifeBuoy](https://appshunter.io/ios/app/lifebuoy/id1483707950) - [ClearlyMe®](https://appshunter.io/ios/app/clearlyme/id1550213032) - [Build Back Better](https://appshunter.io/ios/app/build-back-better/id1562614575) - [Support Base](https://appshunter.io/ios/app/support-base/id1581347935) All apps by Black Dog Institute: https://appshunter.io/developer/336288119 --- *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 2026-08-20.*