# Intergalactic Algebra vs One By One

The clearest difference is ads: Intergalactic Algebra at none against One By One's shown. Intergalactic Algebra also leads on review sentiment (100% vs 91%) and iOS requirement (13.0 vs 15.0). One By One's advantage is ratings volume (77 vs 6). On price, rating, update cadence and in-app purchases there is nothing between them.

Both are free to download. Intergalactic Algebra sells 10 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.

On the App Store both sit at effectively the same score — 4.8 for Intergalactic Algebra against 4.8 for One By One. 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 are what separate them: 100% of Intergalactic Algebra's written reviews are positive against 91% of One By One's.

Intergalactic Algebra ships an update every 3 weeks, One By One every 2 weeks. The most recent releases landed on October 9, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Intergalactic Algebra | One By One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (6 ratings)](https://appshunter.io/ios/app/intergalactic-algebra/id1550524246/reviews)** | [4.8 (77 ratings)](https://appshunter.io/ios/app/one-by-one-mental-math/id1555846023/reviews) |
| Number of ratings | 6 | **77** |
| Positive reviews | **100.0% of reviews** | 90.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 280 MB | 64 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Intergalactic Education LLC](https://appshunter.io/developer/1364648815) | [Brice Brown](https://appshunter.io/developer/1555846025) |

## What reviewers say

### Intergalactic Algebra

[App page](https://appshunter.io/ios/app/intergalactic-algebra/id1550524246)

Engage with algebra through a collection of space-themed games. Solve mathematical problems to launch rockets and advance your skills. The app aligns with Common Core standards and offers optional reports for progress analysis.

**Highlights:** Algebraic problem-solving, Rocket launching gameplay, Common Core aligned math, Proficiency assessment, Optional progress reports, Rewarding gameplay

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Factoring Rocket Report | $2.99 | one-time |
| Functions Rocket Report | $2.99 | one-time |
| Addition Subtraction Report | $2.99 | one-time |
| Multiples of Ten Report | $2.99 | one-time |
| Num Of Solutions Report | $2.99 | one-time |
| Quadratics Rocket Report | $2.99 | one-time |
| Rates of Change Report | $2.99 | one-time |
| Word Problems Rocket Report | $2.99 | one-time |
| Rocket Trivia Rocket Report | $2.99 | one-time |
| Progressions Report | $2.99 | 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 Intergalactic Algebra free?

Intergalactic Algebra 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, Intergalactic Algebra or One By One?

Intergalactic Algebra is rated higher. Intergalactic Algebra averages 4.8 out of 5 from 6 ratings, while One By One averages 4.8 from 77 ratings.

### Do Intergalactic Algebra or One By One have ads?

One By One shows ads; Intergalactic Algebra does not.

### Which is updated more often, Intergalactic Algebra or One By One?

Intergalactic Algebra ships an update every 3 weeks, and One By One every 2 weeks. Most recently, Intergalactic Algebra was updated on October 9, 2026 and One By One on October 13, 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.*