# One By One vs MathArena

The clearest difference is in-app purchases: MathArena at none against One By One's 3. MathArena also leads on ads (none vs shown) and iOS requirement (13.0 vs 15.0). One By One's advantage is update cadence (every 2 weeks vs every 6 weeks). On price and device support there is nothing between them.

Both are free to download. One By One sells 3 in-app purchases, starting at $1.99 per month. MathArena asks for nothing beyond the download.

One By One ships an update every 2 weeks, MathArena every 6 weeks. The most recent releases landed on October 13, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | One By One | MathArena |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (77 ratings)](https://appshunter.io/ios/app/one-by-one-mental-math/id1555846023/reviews)** | — |
| Number of ratings | **77** | — |
| Positive reviews | 90.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 weeks** | Every 6 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 64 MB | 31 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brice Brown](https://appshunter.io/developer/1555846025) | [Daniel Castro](https://appshunter.io/developer/1888870928) |

## What reviewers say

### One By One

[App page](https://appshunter.io/ios/app/one-by-one-mental-math/id1555846023)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Support | $1.99 | per month |
| Yearly Support | $12.99 | per year |
| Lifetime Supporter pass | $19.99 | one-time |


### MathArena

[App page](https://appshunter.io/ios/app/matharena-math-challenge/id6761319928)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is One By One free?

One By One is free to download, with in-app purchases available.

### Is MathArena free?

MathArena is free to download, with no in-app purchases.

### Do One By One or MathArena have ads?

One By One shows ads; MathArena does not.

### Which is updated more often, One By One or MathArena?

One By One ships an update every 2 weeks, and MathArena every 6 weeks. Most recently, One By One was updated on October 13, 2026 and MathArena on October 16, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*