Learning, drawn as a map.
Tangent turns twenty-four subjects, from the cosmos to the stock market, into one transit map. Every subject is a numbered line and every idea is a stop. Each stop opens with a small diagram that moves: eleven days falling out of September 1752, a galaxy turning while you read why it should fly apart, twenty-three dots linking up until you see why two strangers probably share a birthday.
You ride from stop to stop with a swipe. Every stop has an interchange to the subject next door, so when something catches you, you change lines: from galaxies to the mathematics of weighing what you can't see. Read a stop to the end and it's stamped on your map.
It learns how you ride: linger, open How it works, keep a stop, take an interchange, and Tangent plans the next stops that way. Type a subject that isn't on the map, like "Trusts" or "Jazz harmony", and Tangent builds you a line of your own in seconds.
A diagram first, then the words.
Each stop opens with a diagram that moves, drawn in its line's color. Then the idea in a sentence, a short explanation, and How it works underneath. A ring on the line at the top fills while you read; when it's full, the stop is stamped.
Every stop has an interchange.
Each stop names the subject next door and why it's related. Take the interchange and the next line's color sweeps across the screen while its line draws out of the station.
Some stops ask first.
About one stop in six opens as a question with two or three answers. Guess, then see. The ones you miss come back as return stops a day or two later to see if they stuck.
Twenty-four lines, 120 stops.
Open the map to see where you've been. Lines you've ridden light up, stops you've read are stamped, and small trains run along your lines. Pinch in to read every stop's name.
Every stop, in order.
Tap any line to see its stops in order. Board it at the first stop you haven't read, or ride only that line for a while.
Type it in Where to?
Type a subject that isn't on the map and Tangent writes its first stops in seconds, at your level. Two lines of your own are free; Tangent Plus has no limit and adds classes, laid out unit by unit as stops.
Kept stops come back.
Keep a stop and it returns as a return stop in 2 days, then 5, 12 and 30, with the key words missing, until it sticks.
The same idea, four ways.
Pick how Tangent talks to you: like you're in middle school, in high school, a curious adult or an expert. Stops written for younger readers are checked against a content policy before they reach you. The school and expert voices are part of Tangent Plus.
All 24 lines with their diagrams, interchanges, guess-first stops, return stops, your map, sharing and two lines of your own are free and stay free.
Unlimited lines of your own, classes, and stops written for middle school, high school or expert level.
Your level (middle school, high school, curious adult or expert) and, if you give one, a school grade.
