Diffit

Diffit is a focused AI tool for teachers that adapts reading material to different levels. From a topic, URL, PDF, or pasted text it generates a leveled passage plus comprehension questions, vocabulary, and summaries, with translation for multilingual students. Its free tier covers the core workflow without a generation cap, while the paid plan mainly adds export to Google Docs, Slides, and Word.

Diffit solves a specific, common teacher problem: adapting one piece of content for a class of readers at different levels. A teacher pastes text, drops in a URL, uploads a PDF, or just types a topic, and Diffit produces a leveled passage plus ready-to-use extras such as a summary, key vocabulary, and comprehension and discussion questions. Any passage can be regenerated at an earlier or more advanced reading level, and translations let multilingual students read in their home language alongside the English version. The tool is intentionally focused rather than a broad teacher-AI suite. It does one job, reading-adaptation and its supporting resources, and does it well, which is why many teachers use it alongside other tools rather than as a replacement for them. Output is generated as editable resources, and Diffit encourages a teacher-review step before use. Diffit's free tier is unusually generous: the core workflow of leveled passages, questions, vocabulary, and graphic organizers is available without a subscription or generation count. The paid Individual Teacher plan primarily unlocks export to Google Docs, Google Slides, and Microsoft Word, plus school and district options. That means the paywall is largely about export convenience rather than the core AI capability.