KanjiSchool
Drag the slider. No other reader does this — and you should see it working, not read about it.
太陽が 海を あたためると、水は 目に 見えない すがたに なる。
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By the power of the sun, water is always making a journey.
When the sun warms the sea, the water turns into a form the eye cannot see.
The water, having become light, rises high up into the sky.
When it cools in the sky, tiny drops of water gather together into clouds.
When the clouds grow heavy, they fall to the ground as rain or snow.
The water flows down the rivers back to the sea, and repeats the very same journey.
Pick the hardest line you can still read. 20 seconds, no account needed.
Because that is how Japanese children learn to read. Japan's Ministry of Education fixes exactly which character belongs to which grade — so "grade 3" is a boundary you can verify, not a feeling. Every article here is machine-checked: if a single character sits above its grade, it is not published.
The result: you never hit a character you have not learned. That is the whole reason this product exists.
One article at the level you picked, sent at 7:00. No account needed. One tap to stop.