Learn Binary: Bits & Hex

Finally understand binary and hex — by doing, not memorising. Learn Binary turns number-base conversion into fast, satisfying drills. See a number, build the answer on a tappable bit row or a clean keypad, and get an instant verdict with the place-value breakdown behind it. It's built around how you actually learn: a level climb, an ~80% mastery gate, and a three-minute daily habit. WHAT'S INSIDE - The drill — convert decimal ⇄ binary ⇄ hex, both directions. Tap the bits or type the digits, confirm, and see exactly why the answer is what it is. - The nibble block — the standout: see how 0x61 = 0110 0001 = 97, with hex sat over colour-coded 4-bit nibbles. This is the trick that makes hex click. - A level climb — one level per bit, from the first switch up to the full byte (the 256 Club) and beyond. Clear a level test to unlock the next. - Two's-complement — read and write signed bytes, with the sign-bit reveal. - Bitwise ops — AND, OR and XOR, worked one column at a time. - Byte Speed Run — an optional 60-second timed challenge once you've earned it. - Daily goal + streak — a gentle habit, with a streak freeze so one missed day doesn't wipe your progress. - Explore — scrub a number and watch decimal, binary and hex move together. BUILT RIGHT - Fully offline — no account, no sign-up, no tracking required. - A clean, friendly light design in apricot and teal. Remove ads with a single one-time purchase — it removes the interstitial ads, and it's the only thing we'll ever ask you to buy.