One By One vs Numbly
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/
Numbly
Engage in a daily numerical puzzle where you use six numbers and operators to reach a target sum. Enjoy unlimited gameplay in workout mode and share your achievements with friends. Access answers to help you progress through challenging math puzzles.
- Daily number challenges
- Six numbers and operators
- Target sum puzzles
- Social sharing
- Unlimited workout mode
- Access to answers
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Embark on a daily journey of numerical mastery with our immersive puzzle game! Each day, face a fresh challenge, utilizing six numbers and operators to crack the target sum. But the excitement doesn't end there – share your triumphs with friends on social media, fueling the competitive spirit! Immerse yourself in engaging gameplay, where strategic planning and clever arithmetic lead to victory. Experience endless mathematical exploration in our training mode, where the fun never stops! Engage in unlimited gameplay, tackling challenging puzzles. Need a little guidance? No problem! Access the answers whenever you need them to keep the momentum going. Ready to join the fun and showcase your math prowess?
Screenshots
Verdict
The clearest difference is in-app purchases: Numbly at none against One By One's 3. Numbly also leads on ads (none vs shown) and update cadence (every 4 days vs every 2 weeks). One By One's advantage is ratings volume (77 vs 6). On price, device support and iOS requirement 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. Numbly asks for nothing beyond the download.
Numbly holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: One By One has 77 ratings behind it against 6, 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 100% of Numbly's.
One By One ships an update every 2 weeks, Numbly every 4 days. Both last shipped on October 24, 2026.
| Parameter | One By One | Numbly |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (77 ratings) | 5.0 (6 ratings) — better |
| Positive reviews | 90.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 77 — better | 6 |
| Update frequency | Every 2 weeks | Every 4 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 64 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Brice Brown | John Cahill |
Customer experience
One By One
Numbly
In-app purchases
One By One
- Monthly Support$1.991 Month
- Yearly Support$12.991 Year
- Lifetime Supporter pass$19.99
Numbly
No in-app purchases
