Everything you need to roll like a pro.
From your first d20 to multi-group formulas and game rooms.
Tap any die button to toss it into the cup. Tap the Roll button (or just shake your phone) and watch them fly.
All nine dice types are free, from the humble COIN flip to the mighty d100:
Need 3d6? Tap the d6 button three times. It's that simple.
The cup is your staging area — the felt-lined tray at the center of the screen. Every die you tap appears here as a visual chip showing its type and color.
Build whatever combo you need, then hit Roll and let fate decide.
Below the cup you'll find the modifier row — powerful tweaks that change how your dice behave.
Add or subtract a flat number from the total. Rolling 2d6+3? Tap the + until it shows 3.
Classic D&D stat roll: 4d6 drop lowest. Toggle Drop Low and only the
best three dice count. Drop High does the opposite — perfect for disadvantage.
Floor sets a minimum for each individual die. Cap sets a maximum. Roll a d20 with floor 5? No result below 5. Cap at 15? Nothing above it.
Min sets a floor on the total (not individual dice). Max caps the total. Different from Floor/Cap, which work per-die.
When a die rolls its maximum value, it explodes — roll it again and add. And if that one maxes out too? It keeps going. Savage Worlds players, this one's for you.
Count dice that meet or beat a threshold instead of summing. Set success to 5 with a pool of 10d6 and you'll see "4 successes" instead of a total. World of Darkness, Shadowrun, you know the drill.
The DX button (the heptagon) is the most versatile die in the vault. Tap it and you get a prompt with a count stepper and a text input. Here's what it can do:
Type a number like 13 and you get a d13. Want a d37? Go for it. d1000? Sure, why not.
Type comma-separated values like 1,1,2,3 and you get a die with exactly those faces.
Perfect for Formula De gear dice, weighted dice, or anything weird.
Type words or emoji separated by commas: ⚔,🛡,💣,✨
or Hit,Miss,Crit,Fumble. The die shows symbols instead of numbers!
Symbol dice get their own special result display — no totals, just the symbols that came up.
Use the + and - buttons next to the input to add multiple identical dice at once. Need 5 copies of your custom die? Dial it up to 5 and tap OK.
Found the perfect dice setup? Save it as a preset. Tap the save button, give it a name, and it appears in the preset bar above the cup.
Tap a preset to instantly load that configuration — dice, modifiers, everything.
After rolling, the result area shows your total (or symbol faces) with a full breakdown of each die. Dropped dice show as crossed out, exploding dice show their chain.
Every roll is saved to history — tap the 🕒 clock button in the header to see your complete roll log with timestamps.
Curious about the probability? The distribution chart appears below your dice, showing the full probability curve for your current configuration.
It updates live as you add dice and change modifiers. Great for understanding the odds — is 2d6+3 really better than 1d12+2? Now you can see it.
Toggle the lock and your cup becomes read-only. You can still roll, but you can't accidentally add or remove dice. Perfect for game night when you've got your setup dialed in and don't want to fumble it mid-encounter.
When locked, the modifier row hides to give you a cleaner view focused purely on rolling.
Tap the 🎨 palette button to switch themes. Free users get two:
Pro unlocks four more ✨:
Everything above works in free mode. Pro unlocks the advanced tools that serious players and GMs reach for. Here's what you get:
In Pro mode, you get a formula bar at the top where you can build complex expressions with multiple dice groups connected by operators.
Tap the + Group button to add another group. Each group gets its own dice and modifiers. Then connect them:
Operators: + - max min
Tap the ? button next to the formula bar for a quick syntax reference right in the app.
Long-press any die in the cup to select it individually. Once selected, modifiers like Exploding, Min, Max, and Success apply to that specific die instead of the whole group.
This is huge for mixed pools — maybe your d20 attack roll explodes but your d6 damage dice don't.
Game Packs are curated preset collections for specific games. Install a pack and get instant access to every common roll for that system.
18 built-in packs ship with the app:
Plus community packs — anyone can submit a pack for their favorite game.
This is the big one. Game Rooms let you roll dice together in real time with your group — no sign-up, no app install required.
The live roll feed shows every player's rolls in real time with color-coded names. You can see exactly what everyone rolled, when, and with what dice.
After the session, the room host can view a full session log with every roll, downloadable as a text file. Rooms expire after 30 days.
Symbol dice show words or emoji instead of numbers. Create them with the DX button by entering comma-separated text:
When you roll symbol dice, the result area shows the symbols that came up instead of a numeric total. Great for custom fate dice, action decks, oracle tables, or any game with non-numeric outcomes.
Symbol dice can't be mixed with numeric dice in the same cup — clear first to switch modes.
Got questions, feedback, or want to share your custom packs? Join the Casdra Software Discord — hang out with other players, share game pack ideas, and get help from the community.