# Math Facts Fluency Builder vs Prim Math

The clearest difference is price: Prim Math at Free against Math Facts Fluency Builder's $3.99. Prim Math also leads on update cadence (every 4 days vs every 38 months). Math Facts Fluency Builder's advantage is iOS requirement (12.2 vs 15.0). On ads, in-app purchases and device support there is nothing between them.

Prim Math is free to download; Math Facts Fluency Builder costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Math Facts Fluency Builder ships an update every 38 months, Prim Math every 4 days. The most recent releases landed on October 16, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Math Facts Fluency Builder | Prim Math |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 4 days** |
| Size | 17 MB | 5 MB |
| Requires iOS | **12.2** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Janine Toole](https://appshunter.io/developer/839832427) | [Warakorn Peannula](https://appshunter.io/developer/6814164403) |

## What reviewers say

### Math Facts Fluency Builder

[App page](https://appshunter.io/ios/app/math-facts-fluency-builder/id1120776629)

**Features:** macOS Compatibility

**In-app purchases:** none


### Prim Math

[App page](https://appshunter.io/ios/app/prim-math/id6814164401)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Math Facts Fluency Builder free?

Math Facts Fluency Builder costs $3.99, with no in-app purchases.

### Is Prim Math free?

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

### Do Math Facts Fluency Builder or Prim Math have ads?

Neither Math Facts Fluency Builder nor Prim Math shows ads.

### Which is updated more often, Math Facts Fluency Builder or Prim Math?

Math Facts Fluency Builder ships an update every 38 months, and Prim Math every 4 days. Most recently, Math Facts Fluency Builder was updated on October 16, 2026 and Prim Math 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.*