You can't look up a word you can't read. Most people learning Japanese hit that wall the first time they open a real video, and Suzu is built around getting past it.
Suzu is a feed of short videos from Japanese creators: vlogs, street interviews, cooking, people talking about their day. Words with kanji in them carry their reading in kana, so a character you have never seen is still a word you can sound out, tap and keep.
字幕 (jimaku): captions
Two caption lines run under every clip, Japanese on top and English underneath. The word being spoken lights up as it goes by. Written Japanese puts no spaces between words, so that moving highlight is often the first time you see where one word ends and the next begins.
単語 (tango): the word you tap
Tap any word for what it means in that line, how it is read, and the dictionary form it came from, so 食べた takes you back to 食べる. Save it and the clip is saved with it. If a line goes past too fast, play the clip at 0.75x or 0.5x and the captions keep time.
漢字 (kanji): families
The kanji tab collects the characters in words you have already heard and groups the words that share them. Save 電車 (train) and 電話 (phone) and the 電 family starts to fill in, each word linking back to the clip where you heard it. You meet kanji in whatever order your feed brings them, and each one arrives with a word you already know.
復習 (fukushū): what comes back
Saved words return as review cards around the day you would have forgotten them, and each card replays the few seconds of clip you found the word in. A week away costs you nothing, because the streak forgives missed days.
If you know your kana, or you're still working on them, and real conversation sounds like one long word, start here. You pick a level before the first clip and the feed starts from there. If you already watch Japanese TV without subtitles, set the level high and use Suzu for the words you keep half catching.
The clips belong to the people who made them. Every video plays in the official YouTube player, carries the name of its channel, and links back to the original.
SUBSCRIPTION
Suzu is a subscription app with no free tier. It costs $49.99 per year after a 7-day free trial, or $9.99 per month with no trial. Payment is charged to your Google Play account when the trial ends. The subscription renews on its own until you cancel it, and you can cancel any time under Subscriptions in the Play Store. Prices are set in US dollars and vary by region.
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Short Japanese videos with readings on the kanji and captions that keep up.