this post was submitted on 25 Feb 2025

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Complex dice roll probability calculator. (sh.itjust.works)

submitted 1 month ago* (last edited 1 month ago) by illectrility@sh.itjust.works to c/rpg@ttrpg.network

15 comments fedilink hide all child comments

I made a web page where you can simulate a complex dice roll sequence with conditionals (e.g. re-roll when roll is a 1) using a Python-like syntax. (Click the "Toggle Syntax" button to view examples)

It needs a second to load because it has to load a Python interpreter in the background (I'm not good at web development) but once that's done, it works really well.

It's still very barebones and I still have to work out some problems.

Maybe some of you could use it, though.

There's also just the Python version available to run locally here

Everything is GPLv3, enjoy!

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[–] Wutchilli@feddit.org 11 points 1 month ago (1 children)

Nice Work, but did you forgot to link the Website?

[–] illectrility@sh.itjust.works 16 points 1 month ago* (last edited 1 month ago)

Yes, yes I did... It's here

Thank you for pointing that out

[–] pennomi@lemmy.world 8 points 1 month ago (1 children)

Extremely impressive! I wrote a dice probability calculator myself recently, but abandoned perfect calculations in favor of a million roll simulation. What you have done is really quite lovely.

[–] illectrility@sh.itjust.works 11 points 1 month ago

Thank you very much. I, too, initially used a sampling approach but that was obviously inefficient and inaccurate. Getting this to work was a HUGE pain so it's nice to read some kind words about it, thank you

[–] neodc@sh.itjust.works 6 points 1 month ago (1 children)

How does it compare with https://anydice.com/ ?

[–] illectrility@sh.itjust.works 4 points 1 month ago* (last edited 1 month ago)

Pretty similar but I couldn't get re-rolls to work on there. That's the main reason I made this

[–] AnExerciseInFalling@programming.dev 6 points 1 month ago (1 children)

This is super cool!

Does it support things like max/min to simulate advantage/disadvantage?

It would be really cool to mathematically compare different kinds of rolls, like the cascading dice damage post from a couple weeks ago (even if its not built into the notation, just writing out the logic by hand)

[–] illectrility@sh.itjust.works 5 points 1 month ago (1 children)

No, there is no advantage or disadvantage functionality. I made it purely for balancing, so finding out the average damage a character would do. In that case I would just write out all the different rolls the character would do when attacking and have the program calculate using that. It's pretty barebones

[–] AnExerciseInFalling@programming.dev 4 points 1 month ago

Still a very cool project! Fun to play around with

[–] Kitathalla@lemy.lol 2 points 1 month ago (1 children)

Cool. I used to have an app that would do this and it was great to play with for various scenarios. Nice to see a website version.

[–] illectrility@sh.itjust.works 2 points 1 month ago (1 children)

What was the app called and is it still available?

[–] Kitathalla@lemy.lol 2 points 1 month ago (1 children)

No, it was oooold. Like, ipod touch old. It didn't make it past ios 5, I think. It's why I'm loving your webpage.

[–] illectrility@sh.itjust.works 2 points 1 month ago

Okay, would've been interesting to see

[–] jcr@jlai.lu 1 points 1 month ago (1 children)

I am working on a dice expression evaluator on my side, and I will certainly reuse your code if I can ! Thanks for giving the example, as a GNU enthusiast, it is very nice ! Great job making it work !

[–] illectrility@sh.itjust.works 1 points 1 month ago

Best of luck to you. I think my code is quite messy but if you can use any of it, feel free!