# 21a OBMEP vs Dia Lab

The clearest difference is update cadence: 21a OBMEP at every 4 days against Dia Lab's every 4 months. 21a OBMEP also leads on device support (3 vs 1). On price, ads, in-app purchases 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.

21a OBMEP ships an update every 4 days, Dia Lab every 4 months. The most recent releases landed on October 24, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | 21a OBMEP | Dia Lab |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/21a-obmep/id6744337826/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 4 months |
| Monetization | Free | — |
| Size | 21 MB | 192 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Instituto de Matematica Pura e Aplicada](https://appshunter.io/developer/1626544658) | [KANTTUM TECNOLOGIA EM EDUCACAO S.A.](https://appshunter.io/developer/1027499390) |

## What reviewers say

### 21a OBMEP

[App page](https://appshunter.io/ios/app/21a-obmep/id6744337826)

This app allows school administrators to digitize and submit student answer sheets for a math competition. It also facilitates the completion of administrative forms related to the competition.

**Highlights:** Digitize answer sheets, Submit student responses, Fill out administrative forms, Digital submission of answer cards, Complete RAIG and Shipping Document

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

**In-app purchases:** none


### Dia Lab

[App page](https://appshunter.io/ios/app/dia-lab/id6763621928)

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

**In-app purchases:** none


## Frequently asked questions

### Is 21a OBMEP free?

21a OBMEP is free to download, with no in-app purchases.

### Is Dia Lab free?

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

### Do 21a OBMEP or Dia Lab have ads?

Neither 21a OBMEP nor Dia Lab shows ads.

### Which is updated more often, 21a OBMEP or Dia Lab?

21a OBMEP ships an update every 4 days, and Dia Lab every 4 months. Most recently, 21a OBMEP was updated on October 24, 2026 and Dia Lab on September 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.*