# Gradepen vs 21a OBMEP

The clearest difference is review sentiment: Gradepen at 63% against 21a OBMEP's 0%. 21a OBMEP's advantage is in-app purchases (none vs 8) and update cadence (every 4 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Gradepen sells 8 one-off in-app purchases. 21a OBMEP asks for nothing beyond the download.

Gradepen ships an update every 2 months, 21a OBMEP every 4 days. The most recent releases landed on September 23, 2026 and July 6, 2026 respectively.

## The numbers

| Metric | Gradepen | 21a OBMEP |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/gradepen/id654152733/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **63.3% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 21 MB | 21 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [Machlev Smart Applications Servico e Venda de Sistemas Ltda ME](https://appshunter.io/developer/654152736) | [Instituto de Matematica Pura e Aplicada](https://appshunter.io/developer/1626544658) |

## What reviewers say

### Gradepen

[App page](https://appshunter.io/ios/app/gradepen/id654152733)

This app automates the grading of shuffled tests using your device's camera for objective questions. Teachers can input grades for open-ended questions and export results to spreadsheets. It offers a free tier for grading assessments with up to five questions and five items.

**Highlights:** Automatic grading of objective questions, Handles shuffled question order, Input grades for open-ended questions, Export results to spreadsheet, Create and share test questions

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus 50 Grades Pack | $0.99 | one-time |
| Plus 150 Grades Pack | $0.99 | one-time |
| Plus 120 Grades Pack | $1.99 | one-time |
| Plus 300 Grades Pack | $1.99 | one-time |
| Plus 250 Grades Pack | $2.99 | one-time |
| Plus 600 Grades Pack | $3.99 | one-time |
| Plus 500 Grades Pack | $4.99 | one-time |
| Plus 1000 Grades Pack | $7.99 | one-time |


### 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

**In-app purchases:** none


## Frequently asked questions

### Is Gradepen free?

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

### Is 21a OBMEP free?

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

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

Neither Gradepen nor 21a OBMEP shows ads.

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

Gradepen ships an update every 2 months, and 21a OBMEP every 4 days. Most recently, Gradepen was updated on September 23, 2026 and 21a OBMEP on July 6, 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.*