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Testizer
ClassMarker
Teachable
Treehouse
CEFR language tests in 13 languages. Free test, instant QR-verified certificate for €8.

Website, pricing, platforms and company facts side by side.
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| Website | stackgo.io | examinizer.net |
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| Company | — | Startup from the Czech Republic · 1 - 9 employees · 2025 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of StackGo yet.
Examinizer is a multilingual language proficiency testing platform aligned with the CEFR framework. Take free tests in 13 languages — English, German, French, Spanish, Italian, Portuguese, Turkish, Arabic, Chinese, Korean, Bulgarian, Czech, Polish — across all six levels A1–C2. Pass and get an...
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As answered by people managing StackGo and Examinizer.
Examinizer's answer:
Examinizer is the only platform offering CEFR-certified language tests across 13 languages at all 6 levels (A1–C2). Most competitors focus on English only. Tests are free, the certificate costs €8, and it includes QR verification that employers can check in seconds.
Examinizer's answer:
EF SET and Duolingo English Test cover only English. Testizer has limited languages and no instant certificates. Examinizer covers 13 languages, issues a verifiable PDF certificate immediately after passing, and allows one-click sharing to LinkedIn.
Examinizer's answer:
Job seekers who need language proof for applications, students applying to international programs, HR teams screening candidates at scale, and independent learners tracking CEFR progress.
Examinizer's answer:
Founded in Prague by Peter Shimanov (POSAYSHINE s.r.o.). The idea came from a simple problem: official language exams cost €150–300 and require travel to test centres. Examinizer offers a credible, affordable online alternative.
Examinizer's answer:
PHP 8.2, MySQL 8.0, Python (ReportLab for PDF), Claude AI API for adaptive testing and question classification, myPOS for payments.
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