# GPD vs Regla de tres

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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GPD ships an update monthly, Regla de tres every 19 months. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | GPD | Regla de tres |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Monthly** | Every 19 months |
| Monetization | Free | — |
| Size | 21 MB | 24 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Charles Steinmetz](https://appshunter.io/developer/1514567876) | [Edwin Mejia](https://appshunter.io/developer/1620400021) |

## What reviewers say

### GPD

[App page](https://appshunter.io/ios/app/gpd/id1514567877)

This app helps farmers assess planting uniformity by measuring seed spacing. It calculates the Coefficient of Variation (CV%) and analyzes distribution regularity, identifying acceptable spacing, doubles, and skips to improve crop yield.

**Highlights:** Measures seed spacing uniformity, Calculates Coefficient of Variation (CV%), Analyzes distribution regularity (acceptable, doubles, skips), Identifies causes of planting errors, Aids in improving plantability

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

**In-app purchases:** none


### Regla de tres

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

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is GPD free?

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

### Is Regla de tres free?

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

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

Regla de tres shows ads; GPD does not.

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

GPD ships an update monthly, and Regla de tres every 19 months. Most recently, GPD was updated on October 24, 2026 and Regla de tres on October 27, 2026.

---

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