# Regla de tres vs Contta

The clearest difference is in-app purchases: Regla de tres at none against Contta's 3. Regla de tres also leads on device support (3 vs 1). Contta's advantage is ads (none vs shown) and update cadence (every 2 weeks vs every 19 months). On price and iOS requirement there is nothing between them.

Both are free to download. Contta sells 3 in-app purchases, starting at $0.49 per month. Regla de tres asks for nothing beyond the download.

Regla de tres ships an update every 19 months, Contta every 2 weeks. The most recent releases landed on October 17, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Regla de tres | Contta |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 19 months | **Every 2 weeks** |
| Size | 24 MB | 32 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Edwin Mejia](https://appshunter.io/developer/1620400021) | [Moises Neto](https://appshunter.io/developer/1678133901) |

## What reviewers say

### Regla de tres

[App page](https://appshunter.io/ios/app/regla-de-tres/id6443945192)

**Features:** macOS Compatibility

**In-app purchases:** none


### Contta

[App page](https://appshunter.io/ios/app/contta/id6446501434)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.49 | per month |
| Yearly | $4.99 | per year |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Regla de tres free?

Regla de tres is free to download, with no in-app purchases.

### Is Contta free?

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

### Do Regla de tres or Contta have ads?

Regla de tres shows ads; Contta does not.

### Which is updated more often, Regla de tres or Contta?

Regla de tres ships an update every 19 months, and Contta every 2 weeks. Most recently, Regla de tres was updated on October 17, 2026 and Contta on October 3, 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.*