Text Difficulty Converter

Text Difficulty Converter rewrites texts to match target proficiency levels from A1 to C2. It also generates spoken audio from text and converts uploaded audio files into written transcriptions. The reviewer finds it useful for educators adjusting text complexity and for writers refining their prose.

Yes. Text Difficulty Converter requires an OpenAI API key for its advanced functions, and the reviewer notes this may be a hurdle. Text can be processed in smaller chunks, with the number of chunks setting the number of API calls made.

No paid plan was found on the vendor's site in September 2026, and Toolio lists its starting price as free. Usage runs through the user's own OpenAI API key, though, and the reviewer warns that charges per processed chunk can add up quickly, so Toolio says it is not for content editors with strict budgets.

Text Difficulty Converter offers a few different voices for text-to-speech, but the selection is limited. The reviewer lists the lack of customizable narrator profiles as a shortcoming, alongside the absence of detailed readability metrics beyond the rewriting itself.

Text Difficulty Converter is best for language teachers and content creators who need texts adjusted to different proficiency levels. It runs on the web and holds a Toolio score of 3.7 out of 5, given by Alex after real use.