Measured Collection

Research

We test how well AI actually understands Indonesian and its regional languages, map the words that trip up native speakers, and publish the numbers along with the raw data and their limits, including when the results are not what we hoped for.

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Structured DataAugust 5, 2026

LanguageTool has rules for 35 languages. Indonesian is not one of them.

Before writing grammar rules from scratch, we mined LanguageTool's entire rule base to see what Indonesian could borrow. A third of it is unusable for us, and there is no Indonesian module at all.

Correction engine Grammar Methodology

35Languages with a module0Indonesian modules32.8%Rules impossible to reuse

EmpiricalAugust 2, 2026

When the grammar book is wrong and the native speaker is right

Six of our 40 Javanese test items were dropped. Not because models answered them wrongly, but because the textbook rule contradicted what speakers actually accept.

Javanese Grammar AI benchmark

6Javanese items dropped40Total Javanese items1Dialect variants tested