Build an Encounter Prep Tool for Tabletop Game Masters

1. 1

   Build on the licensing that is actually open

   The dominant system's system reference document is published under a Creative Commons license, which defines exactly what rules content you may build on; monsters, spells, and mechanics outside it, and all trademarked settings, are off limits without separate licenses. Read the license, build inside it, and let community content creators fill the rest through their own rights.

2. 2

   Make encounter math trustworthy first

   Party size, levels, and desired difficulty in; a balanced encounter with terrain and tactics suggestions out. GMs distrust black boxes, so show the budget math while offering the creative dressing. Reliable balance plus one inspired twist per generation is the recipe that earns weekly use.

3. 3

   Organize the living campaign

   NPCs with faces and voices notes, faction states, plot threads with 'players last heard' markers, and session recaps. The tool should answer the panic question ('what was that innkeeper's name from session three?') in two seconds at the table.

4. 4

   Integrate where the games happen

   Clean export into the popular virtual tabletop platforms (each has its own module and API conventions) turns prep into play without retyping. Integration quality is a bigger adoption driver than any generation feature, because it deletes the most annoying hour of the week.

5. 5

   Use AI as the improv partner, honestly

   Name generation, read-aloud text drafts, and 'my players went left instead of right' rapid pivots are where AI assistance genuinely helps. Label AI-drafted content, keep the GM as author, and never train on or resell user campaigns; this community is rightly sensitive about both craft and creators' rights.

6. 6

   Grow where GMs confess their prep sins

   GM-focused forums, actual-play communities, and content creators who teach game mastering reach exactly your buyer. A generous free tier for one campaign converts to paid when the second campaign starts or the group insists on the good exports; patience and community respect beat ads in this hobby.

Do not take our word for the money. Put your own numbers in and see what this idea has to earn before it works. Free, instant, no account needed.

Best for: A developer who runs games themselves and knows the Sunday-night prep panic firsthand

Not for: Builders who would republish copyrighted rules, or who want to build for players rather than GMs. This serves the game master's prep, on openly licensed content only.