Does it read kanji correctly? +
Most of the time. Readings are chosen from context, but names, rare words and some numbers can come out differently from what you intended. If a word is read wrong, write it in hiragana and generate the audio again.
What level of Japanese is this for? +
Any level, because you choose the text. Beginners can start with short sentences at a gentle speed; intermediate learners can paste essays, articles or work emails. The levels on the samples are only a rough guide.
Is it free? +
The samples on this page are free to listen to without an account. Generating your own audio uses credits: the free plan includes a monthly allowance, and Plus or credit packs add more. See Pricing for the current details.
Can I listen offline? +
On the web you can download each track as an MP3. The iPhone app can save tracks to your device and play them offline.
What text can I use? +
Any text you have the right to use, such as your own notes and diary, or material you're allowed to copy for personal study. Your audio stays in your private library.