One By One vs BadAdmin
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
One By One
Practice arithmetic, algebra, trigonometry, and calculus with a retro-style math game. Level up by solving problems, unlock new challenges, and compete on leaderboards. Enhance your skills with artifacts and strategic upgrades.
- Randomly generated math problems
- Leveling system with unlockable content
- Practice arithmetic, algebra, trigonometry, and calculus
- Retro ASCII art and music style
- Leaderboards and achievements
- Math artifacts and upgrades
- AI battle mode for targeted practice
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One By One is a retro math study game built for middle and high school students looking to level up their mental math skills. Featuring randomly generated problems, the app lets you switch from basic arithmetic to advanced calculus. You can also target specific practice areas using the One By One Battles mode or the premium Sandbox mode. Key Features Retro Calculator Aesthetic: Enjoy a nostalgic UI designed with classic Unicode and ASCII art, complete with satisfying mechanical key clicks and atmospheric background music. Four Math Disciplines: Practice everything from basic arithmetic and high school algebra to trigonometric functions (complete with a built-in unit circle) and calculus derivatives. Leveling System: Progress all the way from Level 1 to 99, unlocking brand-new question tiers every ten levels. AI Battles & Training: Test your speed in targeted training modes or race against AI opponents to earn in-game rewards. Artifacts & Upgrades: Solve rare "Golden Problems" to collect 25 unique math artifacts featuring 9 distinct upgrades to shape your strategy. Leaderboards & Achievements: Compete across 5 specialized leaderboards, including a balance-based leaderboard, and uncover hidden achievements. Download One By One and start solving math faster than your teacher! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
BadAdmin
Manage servers and minimize downtime in this simulation game. React quickly to server failures by restarting them to keep operations smooth. Your goal is to achieve the lowest possible server downtime.
- Server management simulation
- Minimize server downtime
- React to server failures
- Restart failed servers
- Achieve low downtime
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We welcome you as our new server admin. Unfortunately our servers are very prone to failure. So all you have to do is keep the server running and achieve the lowest possible server downtime. If a server fails, the server number is displayed and you have to switch the server back on otherwise the downtime becomes too high.
Screenshots
Verdict
The clearest difference is review sentiment: One By One at 91% against BadAdmin's 0%. One By One also leads on rating (4.8 vs 2.0) and ratings volume (77 vs 1). BadAdmin's advantage is in-app purchases (none vs 3). On price, ads and device support 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. One By One sells 3 in-app purchases, starting at $1.99 per month. BadAdmin asks for nothing beyond the download.
One By One holds the better App Store score, 4.8 against 2.0. That said, the two scores are not equally well evidenced: One By One has 77 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 91% of One By One's written reviews are positive against 0% of BadAdmin's.
One By One ships an update every 2 weeks, BadAdmin every 5 weeks. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.
| Parameter | One By One | BadAdmin |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (77 ratings) — better | 2.0 (1 ratings) |
| Positive reviews | 90.9% of reviews — better | 0.0% of reviews |
| Number of ratings | 77 — better | 1 |
| Update frequency | Every 2 weeks — better | Every 5 weeks |
| Ads | Yes | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Ad-supported — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 64 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Brice Brown | Torben Steen |
Customer experience
One By One
BadAdmin
In-app purchases
One By One
- Monthly Support$1.991 Month
- Yearly Support$12.991 Year
- Lifetime Supporter pass$19.99
BadAdmin
No in-app purchases
