# GeoCon HD vs One By One

The clearest difference is ads: GeoCon HD at none against One By One's shown. GeoCon HD also leads on rating (5.0 vs 4.8) and iOS requirement (12.0 vs 15.0). One By One's advantage is update cadence (every 2 weeks vs every 5 months) and ratings volume (77 vs 1). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Both are free to download. GeoCon HD sells 2 one-off in-app purchases and One By One sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

GeoCon HD 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 1, so its average is the more settled of the two. Written reviews complicate that: 84% of GeoCon HD's written reviews are positive against 91% of One By One's, so the app with the better star average is not the one people write more warmly about.

GeoCon HD ships an update every 5 months, One By One every 2 weeks. The most recent releases landed on October 17, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | GeoCon HD | One By One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/geocon-hd/id919438593/reviews)** | [4.8 (77 ratings)](https://appshunter.io/ios/app/one-by-one-mental-math/id1555846023/reviews) |
| Number of ratings | 1 | **77** |
| Positive reviews | 84.2% of reviews | **90.9% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 49 MB | 64 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Oleh Yudin](https://appshunter.io/developer/381844540) | [Brice Brown](https://appshunter.io/developer/1555846025) |

## What reviewers say

### GeoCon HD

[App page](https://appshunter.io/ios/app/geocon-hd/id919438593)

An interactive educational game that makes learning plane geometry engaging and tangible. Students and math enthusiasts can create and manipulate geometric constructions with their fingers, solving tasks and discovering new levels. It offers a fun way to enhance mathematical reasoning skills.

**Highlights:** Interactive geometric constructions, 38 levels in 4 categories, Multiple solution paths, Hints and user-friendly guidance, Practice Mode, Game Center achievements

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Three keys for levels unlock | $0.99 | one-time |
| Unlock all game levels to play | $0.99 | one-time |


### 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 |


## Frequently asked questions

### Is GeoCon HD free?

GeoCon HD is free to download, with in-app purchases available.

### Is One By One free?

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

### Which has better reviews, GeoCon HD or One By One?

GeoCon HD is rated higher. GeoCon HD averages 5.0 out of 5 from 1 ratings, while One By One averages 4.8 from 77 ratings.

### Do GeoCon HD or One By One have ads?

One By One shows ads; GeoCon HD does not.

### Which is updated more often, GeoCon HD or One By One?

GeoCon HD ships an update every 5 months, and One By One every 2 weeks. Most recently, GeoCon HD was updated on October 17, 2026 and One By One on October 22, 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.*