One By One: Mental Math
Brice Brown Games iPhoneiPadiPod touch
One By One: Mental Math is a free Games app for iPhone and iPad by Brice Brown. Rated 4.8/5 from 77 ratings. Requires iOS 15.0. Updated October 9, 2026.
- Rating
- 4.8
- 77 ratings
- Price
- Free
- on the App Store
- Size
- 64 MB
- Age 4+
- Updated
- Oct 9
- 2026 · v1.9.3
Screenshots
About One By One: Mental Math
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/
Ratings & reviews
4.8
77 ratings
What’s new
Version 1.9.3 · Updated October 9, 2026
Test Prep Terminal: Standarized-style word problems, now with 30 new question types and 53 new problems. Every question shows a worked solution. Daily Drill: 10 questions in 2 minutes. Keep your streak going, earn in-game cash, and review every answer when you're done. Find your speed: new players take a quick timed check and get a baseline and a plan for their goal. Sandbox: Test Prep now works in the sandbox, with bigger, easier-to-tap controls. More room on screen: practice screens now use the full height on newer iPhones, and layouts are tuned for every iPhone and iPad in both orientations. Hardware keyboard support: A–D or 1–4 to answer, Enter to continue. Fixes: study reminders now repeat, sounds respect the silent switch, artifacts give the right bonuses, Test Prep answers are graded correctly, and cloud sync no longer loses Test Prep progress.
Play today's Threadline puzzle
Draw one line through every cell, visiting the numbers in order. A free daily puzzle from Fiplay, same board for everyone. It plays right here, no download.
App privacy
The developer, Brice Brown, reported these privacy practices to Apple.
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Location: Coarse Location
- Usage Data: Product Interaction
- Diagnostics: Crash Data
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Location: Coarse Location
- Usage Data: Product Interaction
- Diagnostics: Crash Data
- Identifiers: User ID, Device ID
- Contact Info: Email Address
Used for: Third-Party Advertising, Analytics, App Functionality
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Diagnostics: Performance Data
Used for: Analytics
Alternatives to One By One: Mental Math
Looking for apps like One By One: Mental Math? Here are 6 similar apps on the App Store. The highest rated is Intergalactic Algebra (4.8/5), and all 6 are free to download.
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| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| One By One: Mental Math | 4.8 / 5 (77 ratings) | Free | October 9, 2026 | |
| Intergalactic Algebra | 4.8 / 5 (6) | Free | Aug 11, 2025 | Compare |
| SmartGo One | 4.8 / 5 (1,950) | Free | Oct 12, 2026 | Compare |
| Assembly Line 2 | 4.8 / 5 (1,534) | Free | Oct 1, 2025 | Compare |
| Shapez - Factory Game | 4.5 / 5 (1,521) | Free | Dec 22, 2025 | Compare |
| BadukPop Go | 4.8 / 5 (7,062) | Free | Oct 12, 2026 | Compare |
| Roll | 4.6 / 5 (459) | Free | Jul 3, 2025 | Compare |