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Chalk Index

Chalk Index

Weekly data for ESL teachers reskilling in the AI era. What buyers pay. What skills are emerging. Where the work is moving.

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The corporate language training layer publishes everything except price

The corporate language training layer publishes everything except price

Berlitz, EF Corporate, goFLUENT, Voxy — and Preply Business and Babbel for Business — all surface languages, formats, integrations, case studies, and named clients on their public pages. None publish per-seat rates. The transparency gap is the mechanism.

Jun 11, 2026

Overseas EFL: the hidden compensation gap

Overseas EFL: the hidden compensation gap

Stated salary makes JET look like the highest payer and AEON look mid-pack. The all-in package — base + housing + airfare + severance — promotes hagwons and EPIK and drops AEON to last.

Jun 4, 2026

Business English: three platforms, three taxonomies

Business English: three platforms, three taxonomies

Preply has a Business English specialty tag (16,481 tutors, 38.7%). italki has a filter chip 94% of teachers apply. Wyzant has no Business English category at all — its ESL/ESOL subject is the closest equivalent. Three taxonomies, one vertical.

May 28, 2026

TOEFL vs IELTS, head-to-head across the big three

TOEFL vs IELTS, head-to-head across the big three

Two tests, two buyer populations, three platforms. The rate gap is small everywhere except Wyzant — and the specialist premium only exists in one of the three markets.

May 21, 2026

How TOEFL tutoring is structured across Preply, italki, and Wyzant

How TOEFL tutoring is structured across Preply, italki, and Wyzant

And whether the three biggest online marketplaces are actually where the TOEFL prep market lives.

May 14, 2026

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Chalk Index

Weekly data for ESL teachers reskilling in the AI era. What buyers pay. What skills are emerging. Where the work is moving.

© 2026 Chalk Index | Teaching in the AI Economy.
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