Grimory - RPG System Designer
A downloadable tool for Windows, macOS, and Linux
Grimory is a desktop tool built for tabletop RPG Game Masters and system designers. Organize your worlds, balance your mechanics, and manage every detail of your campaign—all without leaving the application.
Whether you're running a custom D&D world, designing a homebrew system, or creating your own tabletop ruleset, Grimory centralizes everything you need: character creation rules, monster stats, loot tables, magic items, spell systems, and campaign documentation. Your world, fully organized and instantly accessible.
Organize Your World
- Character Creation System: Design races, classes, backgrounds, and attributes that players use to build characters
- Progression & Leveling: Define XP thresholds, level-up mechanics, and advancement rules for your system
- Attributes & Skills: Create the core stats and derived attributes that drive your game mechanics
- Spells & Abilities: Catalog all spells, special abilities, and combat maneuvers with full descriptions and mechanics
- Equipment & Treasure: Build a complete item database with weapons, armor, magical items, and crafting recipes
- Monster Bestiary: Store detailed enemy stat blocks, behaviors, loot drops, and encounter data
- Status Effects & Conditions: Manage buffs, debuffs, poisons, blessings, and special conditions during gameplay
- Dynamic Loot Tables: Create realistic treasure generation with weighted drops and encounter rewards
- Organized Folders & Tags: Keep your content structured with custom folders and tagging system for quick access
- Campaign Wiki: Write rich, formatted notes about your world, lore, and plotlines with a powerful editor
Test & Balance Your System
- Build Simulator: Create sample characters and test different builds to ensure your system feels balanced
- Dice Probability Tools: Analyze dice rolls and probability distributions to verify encounter difficulty
- Real-Time Testing: Tweak mechanics and see the impact immediately without restarting
What's Included
- Full-featured desktop application for Windows
- All features unlocked—no paywalls or limitations
- One-time purchase with free updates forever
- Completely offline—your campaign stays private and secure
- Export to JSON for sharing or integration with other tools
- Customizable interface with themes and multiple languages
Grimory is your Game Master's workbench. Spend less time hunting through notes and more time running great sessions. Whether you're tweaking a homebrew system, creating a brand-new world, or just keeping your campaign organized, Grimory keeps everything at your fingertips.
Coming Soon
Rich Text Editor for WikisFolder Organization with Custom TagsDice Probability Calculator- Map Design
- Quest Management
- Additional Language Translations
Your feedback drives development. Have a feature request? Use it in your campaign for a week and tell us what would make your sessions run smoother. We actively listen to the tabletop community.
Help Grimory Grow
If you're enjoying Grimory, consider leaving a rating and review on itch.io. It really helps other Game Masters find the tool and keeps me motivated to build new features. Thanks for the support.
Purchase
In order to download this tool you must purchase it at or above the minimum price of $7.49 USD. You will get access to the following files:
Development log
- GRIMORY UPDATE v1.9.3 - STABILITY AND NEW FEATURES3 days ago
- Grimory Update – Bug Fixes and ImprovementsJul 24, 2025
- Lançamento do Grimory: RPG System DesignerJul 22, 2025
Comments
Log in with itch.io to leave a comment.
This is super cool! I'd love to see a tab that allows the creation of characters, with the ability to assign race, class, skills, and inventory items!
Are you planning to have this on steam please? If we buy from here, do we get a steam key later ?
Hey! Thanks for the interest! I don't have plans to launch on Steam at the moment due to the costs involved. For now, Grimory is available on itch.io which allows me to keep developing without the upfront fees. But I'm definitely keeping Steam in mind for the future as the project grows! If you purchase here on itch.io, you'll get all future updates included.
Happy New Year, by the way! 🎆🎉🎲😊
Thanks for the clear answer, Natte! I totally understand the choice, itch.io is a great platform for indie devs. That makes sense. I’ve decided to grab it here to support the project anyway. Looking forward to seeing Grimory grow!
Just a quick follow-up: if you do end up launching on Steam later on, would you consider providing Steam keys to itch.io buyers?
Either way, happy New Year and keep up the great work!
EDIT : done, i'm looking forward to give it a try.
Grimory-1.9.3-win.zip
Grimory.Setup.exe
Which one should I install, please? Or it doesn't matter?
I’m on Windows 11 (64-bit).
If it ends up going to Steam, I'd definitely want to give keys to the people who supported it here first. Can't make any promises yet since I'm not sure if/when that'll happen, but if it does, you'd be covered for sure.
About the files - both work on Windows 11 64-bit:
Setup.exe = runs installer, picks folder, installs everything
zip file = extract anywhere and just run it directly
Setup.exe is probably easier but both do the same thing in the end. Whatever works best for you!
Thanks for picking it up btw, really appreciate it!
Awesome, thanks for the tips! I’ll go with the Setup.exe to keep it simple.
And thanks for being so cool about the Steam keys, it’s great to know you’ve got our backs ^_^ , but I’m honestly just happy to support the game here for now.
Can’t wait to start using it. Have a great one!
I'm thinking about buying this. Are you able to load your own pictures of characters/items etc?
Yes! Absolutely.
The Grimory fully supports custom images. You can load your own pictures for character portraits, item icons, and more to customize your system.
Sold! Thanks for the quick reply! :)
It would be awesome if you included dice probabilities. Just purchased this, can't wait to try it for my upcoming project!
That's a great suggestion! I was actually already planning on adding dice probabilities in an upcoming update. Thanks for the purchase and the feedback!
hi, It's a great program for me, but there seem to be some issues.
Nothing happened when I clicked the 'Add New Formula' button.
another problem is : if I use this formula "100 * (level ^ 1.5 + level)" to calculate the XP, it seems like to return incorrect values.
Thanks a lot for the feedback! I'm already working on fixing the 'Add New Formula' button issue. I also found a problem with how custom formulas like yours are being parsed, and I'm correcting it as well. An update will be available very soon!