Changed todayThe Lantern Road
A caravan route gone quiet: four strangers, one missing watch captain, and a bell that tolls out of time.
OpenContinue: Session 1Prep once. Run the whole night from one tab.
Adventure Builder keeps your creatures, adventure text, maps, music and voices together, and shows your players only what you choose to show them.
- 5e and 5.5e compatible, plus a second system
- 9,284 open-licensed creatures and spells to search
- Keeps working if your connection drops
- Pages, maps and boards download as files
The Library is free. The other eight are included with Adventure.
Everything a session needs, on one campaign.
Prep at your desk, run it at the table. Every tool opens on the same campaign, so nothing is typed twice.
PrepPlay
Every creature and spell, one search away.
Free with every account
Search and filter 9,284 creatures and spells across both systems. Read full stat blocks with clickable dice, open a spell or a condition without leaving the creature, and keep your own notes and portraits beside any record.
- Filter by system, challenge or level, type, size, source, spell school and more
- Click a formula in a stat block to roll it
- Add your own creatures and spells; they never overwrite the library
Build a fight that fits your party.
Included with Adventure
Set your party's size and level, add creatures from the Library, and watch the experience budget fill. Both systems' rules are built in. Save the encounter, or hand it straight to the Combat Tracker.
- Budgets for 5e (the 2014 and 2024 methods) and the second system
- The difficulty updates as you add each creature
- Quick build suggests recipes that fit
Make your own monsters, balanced by the book.
Included with Adventure
Pick a role and a challenge rating, or a level, and the Builder sets the numbers from the system's own benchmarks. Start from scratch or from any creature in the Library, tune every number, then save it to your own library.
- Roles from Brute to Caster set where the strength goes
- Every number stays editable, with attacks, abilities and spells
- A finished creature drops straight into an encounter
Write the adventure once. Read it anywhere.
Included with Adventure
Lore holds your adventure as pages of blocks: read-aloud text, notes for you alone, tables, lists and stat blocks. Import Markdown, nest pages into chapters, and pin any passage to tonight's Board.
- Read-aloud boxes and GM notes are separate, so private text stays private
- Import a file, or a whole book split into chapters
- Pin a page or a passage to the Board in one click
Run combat without the bookkeeping.
Included with Adventure
Initiative, rounds, hit points, markers and dice in one place, with undo for every mistake. Creatures you add arrive with their own armor class, hit points and initiative bonus.
- Next turn, rounds and markers without a pencil
- Click any formula to roll it
- Show the turn order on a TV or your players' phones
Tonight's table, laid out.
Included with Adventure
A free-form board of notes, timers, counters, checklists, random tables, images and audio. Keep one per session, pin passages from Lore, and show a card to your players with a click.
- Notes, timers, counters, checklists and random tables
- Images and audio cards that play on as you move around the app
- One board per session, saved to your campaign
Maps with fog of war and tokens that know their creatures.
Included with Adventure
Drop in any image, choose a hex or square grid, and reveal the map as the party explores. Tokens can link to Library creatures, and your players can follow the map live.
- Fog you reveal and hide, with measuring and drawing tools
- Tokens with icons, sizes and notes, linked to the Library
- Show the map to your players, and they follow along live
Give the world a voice.
Included with Adventure
Read a Lore page aloud, perform a scene between several characters, or talk to an NPC live and let them answer in character. Reads pick from 30 studio voices and 94 directions, and each NPC gets a voice designed for them.
Voice runs on your own Gemini API key. Google bills you directly. How it works
- Read any page, note or record aloud, or save it as a clip
- Perform a dialogue of up to six speakers
- Talk to NPCs live; they remember what happened
Music and sound at the click of a card.
Included with Adventure
Upload your own music, ambience and effects, or play from 477 built-in tracks sorted by style and feel. Build playlists, and drop audio cards on your Board.
- Your own sounds, kept on your account for every campaign
- Built-in music that does not count against your storage
- Playback carries on as you switch tools
Every campaign, exactly where you left it.
Campaign Home lays your campaigns out as cards, the most recently played first. Open one and you land in the tool you were using, and a fight left mid-round waits to be resumed.
- Give each campaign a cover and a summary, and see what is inside it at a glance.
- Pick up the last board session, or resume the fight where it stopped.
- Run several campaigns side by side. Each keeps its own everything.
A fight is in progress · Round 1 · 7 combatantsResume
Changed 2 days agoThe Drowned Choir
A flooded chapel, a congregation that never left, and a hymn only the dying can hear.
OpenContinue: The flooded nave
Changed last weekAshes of Thornwick
A mining town waits for the ore carts that never came. Something below the gate has learned to sing.
OpenContinue: Session 2Each campaign keeps its own
- Party and saved encounters
- Maps, with their fog and tokens
- Lore pages and Board sessions
- NPCs, voice clips and the player link
Every campaign shares
- The whole Library of creatures and spells
- Your own creatures and spells
- Your notes and portraits on any record
- Your sounds, and the built-in music
Your players see what you choose to show.
Share one link per campaign. Players open it on a phone, a tablet or the TV. There is nothing for them to install and no account to make.
Try the eye and the sword on a creature.
- Monsters stay Enemy 1, Enemy 2 until you reveal them.
- Players see Hurt or Bloody, never the numbers.
- Show a map or a note on the Board the moment you want it seen.
Bring your own Gemini API key.
Every AI feature in Adventure Builder runs on Google's Gemini, through a key you own. Google bills you directly, and Adventure Builder never sees your bill.
- Get a key from GoogleIt takes a minute in Google AI Studio. Turn on billing for its project: Voice needs it.
- Add it in Settings, then VoiceIt is checked with Google before it is kept.
- Read, perform and talkSpeak a page, play a dialogue, or talk to an NPC live.
Stored encrypted, and only used inside a request to Google.
This month's usage is shown beside a link to your Google usage page.
Test it or remove it any time.
No key, no problem: everything outside Voice works without one.
Made for a room full of people, dice and snacks.
Light by default, dark when the lights go down.
A deep forest-green dark theme is one click away, in the header or in Settings. Your choice follows you to every device.
Keeps going when the Wi-Fi doesn't.
A dropped connection does not stop the table. Every tool keeps working, and your edits save themselves when you're back.
Readable at a glance.
Set in Atkinson Hyperlegible, a typeface drawn so letters that look alike never do, with contrast checked on every screen.
Yours to take with you.
Download a Lore page as Markdown, a map with its image, a board with its pictures and audio, or a creature as JSON, and keep it anywhere.
Private by default.
A campaign is visible to you alone. Players see only what you show, through the link you control.
What game masters ask first.
What is Adventure Builder?
A browser-based prep-and-play app for game masters. It holds a library of creatures and spells, your adventure text, encounters, a combat tracker, maps, a board for tonight's table, voices and music, all on one campaign, so you prepare once and run from the same place.
Which game systems does it cover?
Fifth edition, in both its 2014 rules (5e) and its 2024 rules (5.5e), and a second game system. Adventure Builder is 5e and 5.5e compatible. Each system keeps its own rules, labels and reading style, and the app never converts a creature or a rule from one to the other. Encounter budgets, creature building and the Library's filters follow the system you pick, and each of your campaigns can start from your own default.
Do my players need accounts?
No. You share one link per campaign. Players open it on a phone, a tablet or the TV, and they watch: they see the turn order, and any map, image or note you choose to show, and they never operate the app. See For your players.
What do the AI features cost, and who pays?
Every AI feature lives in Voice, which comes with a paid plan. It runs on Google's Gemini, through your own Gemini API key. Google bills you directly and Adventure Builder never sees your bill. Your key is stored encrypted and only used inside a request to Google. Everything outside Voice works without a key. See Your Gemini API key.
What if my internet drops mid-session?
The table keeps going. Every tool works from memory, the header says you are offline, and every unsaved edit waits in your browser until the connection returns, then saves on its own. A reload during the outage loses nothing.
Can I use my own adventure, maps, monsters and sounds?
What does Adventure Builder cost?
Every account starts on Free, with Campaign Home, your campaigns and the whole Library. Adventure opens every tool, with 10 GB for your files, for $8 a month. Mythic has everything in Adventure with 50 GB, for $14 a month. Both are memberships on Patreon. Voice also needs your own Gemini API key, which Google bills. See Pricing.
Your next session starts here.
Make a campaign, import what you have already written, and run your next game from one tab.