Gradepen vs 21a OBMEP
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gradepen
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.
- Automatic grading of objective questions
- Handles shuffled question order
- Input grades for open-ended questions
- Export results to spreadsheet
- Create and share test questions
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Grade automatically the answer keys of shuffled tests with Gradepen! Gradepen.com allows you to create short tests and exams including open-ended and objective questions or reusing questions shared by other users. The exams may have the order of questions and items automatically shuffled to hinder the occurrence of fraud. The objective questions are graded automatically with this App using your device's rear camera. The teacher may also inform the grades of open-ended questions to be totaled in the final test score. You can export the results to a spreadsheet and forward it by email. Promotionally, the grading of assessments with up to five questions of a maximum of five items is free. Don't miss our promotional packages and grade your assessments in seconds with Gradepen! Check our website: www.gradepen.com
21a OBMEP
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.
- Digitize answer sheets
- Submit student responses
- Fill out administrative forms
- Digital submission of answer cards
- Complete RAIG and Shipping Document
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Se você é responsável pela aplicação das provas da OBMEP em sua escola você pode usar este aplicativo para digitalizar e enviar os cartões resposta dos alunos selecionados na 1ª. fase da OBMEP ao invés de envia-los pelo Correios. Você poderá também preencher os RAIG e o Documento de Envio.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Gradepen | 21a OBMEP |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) — better | — |
| Positive reviews | 63.3% of reviews — better | 0.0% of reviews |
| Number of ratings | 2 — better | — |
| Update frequency | Every 2 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 14.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 21 MB | 21 MB |
| Age rating | +4 | 4+ |
| Developer | Machlev Smart Applications Servico e Venda de Sistemas Ltda ME | Instituto de Matematica Pura e Aplicada |
Customer experience
Gradepen
21a OBMEP
In-app purchases
Gradepen
- Plus 50 Grades Pack$0.99
- Plus 150 Grades Pack$0.99
- Plus 120 Grades Pack$1.99
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- Plus 300 Grades Pack$1.99
- Plus 250 Grades Pack$2.99
- Plus 600 Grades Pack$3.99
- Plus 500 Grades Pack$4.99
- Plus 1000 Grades Pack$7.99
21a OBMEP
No in-app purchases
