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Katakana
46 basic characters, 104 in total once dakuten and combinations are counted. Tap one to see how it is written, stroke by stroke, with a memory hook. Tick the box on the ones you want to work on, then practise them. Anything you drill goes into your review schedule automatically.
Tap a character to see its stroke order and a memory hook. Tick the box in its corner to pick it for practice, or use a section's Select all, then press Practise. This is practice at your own pace, on whichever characters you choose. To learn them on a schedule, ten new ones a day, use the katakana review deck.
Basic katakana
With dakuten and handakuten
The same shapes with two strokes or a small circle added. か becomes が, は becomes ば or ぱ.
Combinations
A small や, ゆ or よ after an i-row character glides the two together into one syllable.
Learn all 104 with spaced repetition, ten new a day · Printable katakana chart · the same chart with writing boxes for all 104 characters · writing practice sheets. All free for classroom use.