Japanese pronunciation practice, in your own register
Japanese isn’t tonal in the Mandarin or Cantonese sense, but it does carry pitch accent — hashi can mean "bridge" or "chopsticks" depending on which mora is accented — and reference audio recorded in one fixed voice makes that pattern harder to hear against your own speaking pitch than it needs to be. Polly moves the reference into your register before you try to copy it.
Pitch accent is a smaller signal, but it’s still a signal
Standard Japanese uses a two-level pitch accent system — each mora is relatively high or low — rather than the four- or six-way tone contrasts of Mandarin and Cantonese. It’s a subtler distinction, which paradoxically makes it easier to miss entirely if your reference voice sits in a register far from your own: a shift you’d clearly notice within your own pitch range can disappear when you’re also busy transposing register.
Everyday sentence practice benefits from the same fix even where pitch accent isn’t the point — rhythm and vowel length (a genuinely phonemic distinction in Japanese, unlike English) are both easier to copy from a voice that already sounds like it could be yours.
What you get
Any everyday sentence, translated and read aloud at your measured pitch, with full romanization so you can see the reading while you listen — useful whether or not you’ve learned kana yet. Record your attempt afterward and get scored word by word, with specific corrections rather than a single number.