Professional Materials
Texts + tasks from publisher-grade learning materials.
Selecting Professional Materials
CEFR.AI calibrates language difficulty by combining text complexity with task demand.
Texts + tasks from publisher-grade learning materials.
Selecting Professional MaterialsReal learner outcomes from CEFR.AI proprietary assessment.
Take the TestGSE-aligned evidence on vocabulary, grammar, and skills.
Power of Language Frameworks
Official applications built on the CEFR.AI calibration framework.
Analyze English texts with CEFR and GSE-calibrated scoring for fast, consistent level and difficulty insights.
Measure learner proficiency with the CEFR.AI placement test, calibrated on the same research framework.
An open API and app directory are coming soon so teams can build language products on CEFR.AI scoring.
CEFR (A1-C2) maps to GSE (10-90) so broad levels can be calibrated with finer precision.
2026-03-17
Framework Note
The Zone of Proximal Development (ZPD) is one of the most useful ideas in language education, but it is often described too vaguely to guide real decisions. In practical terms, ZPD is the space between what a learner can do independently and what they can do with support. For CEFR.AI,...
Read post2026-03-17
Method Note
This note documents the current production scoring model as implemented in the score engine API (`meta.version = legacy-gse-v1`). The goal is methodological transparency: what v1 does well, what it does not do, and what evidence currently supports it. v1 estimates text difficulty from text-only inputs. It combines: - Flesch Reading...
Read post2024-12-26
Research Note
Can native-speaker readability metrics really predict CEFR levels? Many online ESL/EFL text analysis tools have defaulted to using the Flesch-Kincaid readability index, simply because no specialized algorithms exist for language learners. Using 59 graded texts, we systematically test whether this widely-adopted solution actually works. While our investigation does reveal a...
Read post2023-07-24
Framework Note
Language frameworks are not optional in language learning; they are the minimum structure required for reliable decisions. If we want to match learners with texts and tasks that are challenging but manageable, we need shared standards for what “difficulty” means. This note is a simple introduction to language frameworks: why...
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