Learn Binary: Bits & Hex

Learn binary and hex the way it sticks — fast drills, a bit-by-bit climb, two's-complement and bitwise, and the nibble trick that makes hex click. Offline, no account.

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.