Master the Doomsday Algorithm to instantly calculate the day of the week for any historical date. Engage in timed challenges, compete against others, and practice various calculation methods to improve your speed and accuracy.





142+ iOS apps & games curated and reviewed
With an average user rating of 4.5★, the doomsday trainer category is one of the App Store's strongest. Browse all 142+ apps and games we track, sorted so the most loved ones surface first.
| # | App | Price | Rating | Ads | In-App Purchases | Updated |
|---|---|---|---|---|---|---|
| 1 | Free | 5.0★ (1) | No | No | May 2026 | |
| 2 | Free | 4.0★ (3) | No | No | May 2026 | |
| 3 | Free | 5.0★ (4) | No | No | May 2026 | |
| 4 | Free | — | Yes | No | May 2026 | |
| 5 | Free | — | Yes | No | May 2026 | |
| 6 | Free | — | No | No | May 2026 | |
| 7 | Free | — | No | No | May 2026 | |
| 8 | Free | 4.6★ (222) | Yes | Yes | May 2026 |





Master the Doomsday Algorithm to instantly calculate the day of the week for any historical date. Engage in timed challenges, compete against others, and practice various calculation methods to improve your speed and accuracy.






Master the art of quickly determining the day of the week for any date between 1800 and 2200. Practice your skills, beat your personal best times, and save custom mnemonics for significant dates.




Easily view class schedules and book your next fitness session. Stay updated with the latest offerings from your favorite gym.










Navigate a post-nuclear wasteland, battling mutants and desperate survivors. This text-based interactive novel puts your choices at the forefront, shaping your journey through a world of danger and difficult decisions. Forge alliances or make enemies as you decide your path to survival.




Survive a post-apocalyptic world overrun by virus-infected beings. As a warrior, explore ruins, defeat mutated creatures, and strategize with unique skill combinations and equipment to overcome challenging bosses. Upgrade your character and choose from diverse heroes to forge your own fighting style.






This AI-powered platform assists personal trainers in managing their business and clients. It offers automated workout creation, client scheduling, payment processing, and progress tracking, all informed by sports science research.


Engage in a 3D first-person sniper game where you aim bullets at targets in slow motion. Prepare for a zombie apocalypse and become a national hero by shooting the undead with precision.








This app helps personal trainers manage and train clients efficiently. It allows for creating custom workout plans, tracking progress, and engaging clients through a centralized platform. Streamline your fitness business and keep clients motivated towards their goals.


Receive personalized fitness coaching delivered directly to you. A trainer will guide your technique and adjust intensity to match your goals and current ability. Book upcoming sessions through the app.

