FlipRoll

FlipRoll is a fast, offline coin flip, dice roller and random number generator, with a fairness test you can run yourself.

COIN FLIP
Tap the coin to flip it. Your lifetime heads and tails count is kept between sessions, with a running split.

DICE ROLLER
Roll a d4, d6, d8, d10, d12, d20 or d100, up to 20 dice at once, with a total. Build custom dice with any range, such as 0 to 9 or -6 to 6, and keep them for next time.

RPG NOTATION
Type rolls in dice notation: 2d6+3, 1d8-1, 4d6dl1 (drop lowest, for ability scores), 2d20kh1 (advantage) or 2d20kl1 (disadvantage). Dropped dice are shown next to the total. One tap rolls the built-in presets, and you can save your own.

RANDOM NUMBER
Set a minimum and maximum, and generate.

HISTORY
Your last 100 results with times. Share them to email, messages or the clipboard, or clear the list.

FAIRNESS TEST
Every result comes from your phone's cryptographic random number generator, mapped to each face without bias. In Settings, run 100,000 coin flips or 100,000 d20 rolls and see the split and a chi-square test on your own device.

Works offline with no account. FlipRoll is free and supported by ads. A one-time Pro purchase removes all ads, with no subscription.