# Quadrillages vs SDM 2021

The clearest difference is price: SDM 2021 at Free against Quadrillages's $4.99. SDM 2021 also leads on update cadence (every 2 months vs every 5 months) and iOS requirement (10.0 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

SDM 2021 is free to download; Quadrillages costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Quadrillages ships an update every 5 months, SDM 2021 every 2 months. The most recent releases landed on October 6, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Quadrillages | SDM 2021 |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/quadrillages/id449062821/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 16 MB | 25 MB |
| Requires iOS | 15.6 | **10.0** |
| Devices | iPad, Mac | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CROMBEZ Emmanuel](https://appshunter.io/developer/375656695) | [Christophe Auclair](https://appshunter.io/developer/1333526155) |

## What reviewers say

### Quadrillages

[App page](https://appshunter.io/ios/app/quadrillages/id449062821)

This application helps users explore axial and central symmetry through interactive drawing on a grid. It covers Euclidean geometry concepts like points, lines, and angles, and can even be used for fraction initiation by dividing figures.

**Highlights:** Axial and central symmetry exercises, Free drawing for Euclidean geometry, Point, line, and figure drawing, Angle and area calculations, Fraction initiation through division

**Features:** Vision Pro support

**In-app purchases:** none


### SDM 2021

[App page](https://appshunter.io/ios/app/sdm-2021/id1554118444)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Quadrillages free?

Quadrillages costs $4.99, with no in-app purchases.

### Is SDM 2021 free?

SDM 2021 is free to download, with no in-app purchases.

### Do Quadrillages or SDM 2021 have ads?

Neither Quadrillages nor SDM 2021 shows ads.

### Which is updated more often, Quadrillages or SDM 2021?

Quadrillages ships an update every 5 months, and SDM 2021 every 2 months. Most recently, Quadrillages was updated on October 6, 2026 and SDM 2021 on October 2, 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.*