Same sounds, new shapes
Katakana has exactly the sounds hiragana has. If you know あ is a, you already know what ア says. Only the shapes are new.
Katakana writes loanwords, foreign names, onomatopoeia and anything that wants emphasis. Same 46 sounds as hiragana, straighter lines. Tap one to watch it, then draw it.
Tap any character to watch its stroke order, then draw it yourself.
Two marks (゛) or a small circle (゜) on a basic character.
Written small, they change the sound of the character before them.
An i-column character plus a small ゃ, ゅ or ょ: one syllable.
Katakana has exactly the sounds hiragana has. If you know あ is a, you already know what ア says. Only the shapes are new.
Katakana stretches a vowel with a bar: コーヒー (kōhī, coffee), ケーキ (kēki, cake). Hiragana writes an extra vowel instead.
シ and ツ, ソ and ン, ク and ワ. The stroke order tells them apart: in シ the long stroke rises from the bottom left, in ツ it falls from the top right. Watch both, then draw them.
Foreign sounds get their own: ファ (fa), ティ (ti), ヴ (vu), ウィ (wi), ジェ (je), ディ (di). Not on the classic chart, everywhere in loanwords.
Loanwords (テレビ, コンピューター), foreign names and places, many onomatopoeia (ドキドキ), plant and animal names in science, and emphasis, a bit like italics.
Names are written by sound, not spelling: María becomes マリア, John becomes ジョン. Naraio suggests one when you create an account, and you can change it.
The first syllabary: particles, verb endings and the furigana over kanji.
A free account keeps your progress: hiragana today, your first kanji this week.
Stroke order from KanjiVG © Ulrich Apel, CC BY-SA 3.0. Readings and meanings from KANJIDIC2 © EDRDG, CC BY-SA 4.0.