# 21a OBMEP vs CAV

21a OBMEP and CAV are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

## The numbers

| Metric | 21a OBMEP | CAV |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 days | — |
| Monetization | Free | — |
| Size | 21 MB | 18 MB |
| Requires iOS | 15.1 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Instituto de Matematica Pura e Aplicada](https://appshunter.io/developer/1626544658) | [Lucas Lobo'](https://appshunter.io/developer/1830362002) |

## 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


### CAV

[App page](https://appshunter.io/ios/app/cav/id6749405883)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 21a OBMEP free?

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

### Is CAV free?

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

### Do 21a OBMEP or CAV have ads?

Neither 21a OBMEP nor CAV shows ads.

---

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