Is there an app that checks my Japanese pronunciation?

What it checks

• Japanese: mora by mora, so a long vowel cut short, a dropped small っ or a rushed beat shows up as a wrong sound.
• TonePerfect aligns your recording with the text you were asked to say and scores the whole recording, each word and each individual sound inside each word, from 0 to 100.
• You read a known text (a test prompt or anything you type), so the score describes how you said exactly those words.
• Your weakest sounds are ranked, so you know what to practise first.

The r-flap: ら・り・る・れ・ろ

Tap the tongue once, quickly, against the ridge behind the upper teeth — between an English l and r, close to the quick d in American "water". Never roll it, never curl the tongue back.

つ (tsu)

A quick t that melts straight into "su" — the "ts" of "cats" at the START of a beat. Don't drop the t and don't say "su".

ふ (fu)

Blow air softly between almost-closed lips, like gently blowing out a candle. NOT an English f — the teeth never touch the lip.

Long vowels: おう・おお・ええ・いい

A long vowel is the same vowel held for one extra full beat — がっこう is ga-k-ko-o, four beats. Keep the vowel pure while you hold it; don't let お drift toward "ou".

Small っ (the held beat)

A held, silent beat: get your mouth ready for the NEXT consonant and hold it closed for one full beat — がっこう has a real beat of silence in the middle. For す/し it is a held hiss instead.

ん (the standalone n)

A full beat of nasal hum on its own. Before b, p or m it sounds like "m"; before k or g like "ng"; before t, d or n like "n". At the end of a word or before a vowel, keep the tongue tip down and just hum through the nose. Whatever the color, give it its whole beat.

う (the flat u)

Like "oo" in "food" but with the lips relaxed and almost flat, not rounded or pushed forward.

Devoiced u and i

Between voiceless consonants and at the end of words, u and i often go silent: です comes out "des'", します comes out "shimas'". Whisper the vowel rather than voicing it fully — a loud "desu" sounds robotic.

Mora timing

Japanese runs on a metronome: every kana gets one equal beat, including ん, small っ, and the second half of a long vowel. Don't stress one syllable and swallow the rest like English does.

Small ゃ・ゅ・ょ

Not a beat of its own: it fuses with the kana before it into ONE beat — きゃ is "kya" in a single beat, never "ki-ya".

し (shi)

Close to English "she", but with the tongue flatter and the lips unrounded — softer than an English sh.

ひ (hi)

A hissier h made with the middle of the tongue high, near the roof of the mouth — like the h in "hue".