A story bible for your novel
Keep cast, places, history, and visual references together. Draft chapters in your writing tool, with your World as the reference beside it.
Plan a world for your storyConnected worldbuilding software
Worldbuilding software that keeps every idea connected
Organize Characters, Locations, lore, visuals, and strange little details inside one connected universe for your novel, tabletop campaign, or roleplay. Start with one idea on your phone, build it privately, and invite people in when you’re ready.
Free to start · Available on iOS and Android · Build solo or together
Built for the way you create
Made for worldbuilders.
Not everyone begins with a map. You might start with a Character, a scene, a campaign problem, or a name that sounds too good to waste. Pick your way in. The rest of the World can grow around it.
Give every idea somewhere to belong
Connect cultures, cities, factions, Characters, artifacts, systems, and historical grudges inside one universe that can keep expanding.
See how worldbuilders use Summon Worlds →Choose a home for your setting
Is this the right worldbuilding software for your project?
Build a connected setting on your phone, with optional artwork and Character roleplay. Choose the workflow that fits your project.
A setting for your campaign
Connect NPCs to places and objects. Keep scheduling, rules lookup, and virtual-tabletop play in the tools you already use.
Explore the campaign-planning workflowOne idea to try first
Try a free browser resource for a name, creature, or outline. Browser results do not automatically become an app World.
Choose a free worldbuilding toolTry one connected project
From a region outline to a Character you can revisit
Try the fictional ferry town from our completed worldbuilding template example. Enter these details yourself, or adapt them to your setting.
1. Create the Lower Vale World
Record the premise: a valley faces a flood, and food shipments take priority on its only ferry. Review the displayed Mana cost before creating.
2. Add Reedbank as a Location
Inside the World, create a ferry landing with a missing bridge, grain on the eastern bank, and a warehouse on the west.
3. Place Mara in Reedbank
In the Location’s Characters tab, create or add Captain Mara. She must finish the crossings before the flood and explain her cargo choices to the council.
4. Explore a decision, then keep what fits
Open Mara from the Location and start a Bound Chat. Ask what she needs for the last crossing. Review her reply and manually record outcomes you choose to keep.
Reopen Reedbank and find Mara. If those connections help you resume your work, try a larger project.
Connected details can inform chat, but suggestions do not automatically become canon, and every fact may not appear in every reply. Check Smart Context settings when something is missing.
Follow the step-by-step app setupChoose how to start, and when to upgrade
Create and edit connected Worlds in the iOS or Android app; explore guides, browser tools, and public Worlds on this website. Follow the download and setup guide to begin.
Free: try the complete small-project workflow
Create Worlds and Characters within Free limits, with daily Mana and ads. No paid subscription is required.
PRO: expand a project you already use
Choose a recurring subscription for more Locations, Character Memories, and images, plus an ad-free experience. Check limits and renewal terms first.
Mana packs: refill when your plan still fits
One-time purchases add Mana for supported actions without changing your plan limits. Check each action’s cost in the app.
Your ideas, without the tab chaos
Your ideas don’t arrive in order. Your World still can.
A Character may show up before their kingdom. A cursed ring may appear before the war that made it matter.
You might invent a tavern, forget it for six months, then suddenly realize it is where the entire story begins.
That is normal. Start wherever inspiration starts, then connect the pieces when the bigger picture comes into view.
silver-eyed princeruined cityThe Glass WarCharacter portraitweapon cardhalf-written plot note
Character
→ lives in a Location
→ belongs to a faction
→ carries an artifact
→ remembers an event
→ has a reason to hate someone
Worldbuilding that moves with you
Catch the idea before it disappears
Open the app when a name, place, Character, or plot twist hits. Save the rough version now. Give it depth when you have time.
At 1:14 a.m.
When the magic system suddenly makes sense.
Between campaign sessions
When you remember what the suspicious innkeeper was hiding.
Somewhere you were definitely meant to be doing something else
When one Character idea becomes an entire dynasty.
One World, real connections
Every detail knows where it belongs
Characters live somewhere. Weapons have owners. Locations carry history. Memories change how people speak. Summon Worlds keeps those relationships visible.
Example World
Petrichor Prime
Location 1
Westerly Isles
Connected to Petrichor Prime
Location 2
The Haughty Strays
Connected to Petrichor Prime
Location 3
The Shadowlands
Connected to Petrichor Prime
Your canon, your call
Use a little help. Keep complete control.
Start from scratch when you know what you want. Use assisted creation when the blank field is staring back. Then edit, replace, keep the useful part, or throw the suggestion out.
Manual creation
Write it yourself
Start with your own name, description, history, and rules.
Assisted starting point
Get unstuck, then take over
Use optional assistance for a starting point when the blank field pushes back.
Same editable result
Edit everything
Refine the name, description, history, rules, and artwork until the Character actually feels like yours.
Location: Nightfall FieldsWeapon: Penumbral HarpoonRival: Seraphine ValeMemory: The SiegeFaction: The Ashen Guard
The harpoon was never meant to survive the Siege.
Then why do you still carry it?
Characters with context
Your Characters remember where they come from
Talk with a Character using the World around them—not a blank chat with a familiar face pasted on top. Their memories, relationships, equipment, and setting give the conversation somewhere to come from.
Explore Character roleplay →Share when you’re ready
Build quietly. Open the gates later.
Keep your World private while it is still fragile. Invite a co-author or campaign group when collaboration would make it better. Publish it when you are ready for other people to explore.
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Battle Rages · Private
Just you and the World taking shape.
Owner view · Only you can explore and edit this World.
Big Worlds. Tiny details.
Start with the kingdom. Or the cursed spoon.
Build the part that is already clear. The rest can grow around it.
Worlds
Characters
Locations
Weapons
Armor
Items
Spells
Artwork
Character Roleplay
Community spotlight
Explore worlds brought to life by the community
See what storytellers, game masters, writers, and artists are creating together in Summon Worlds.
Hoot7842Petrichor Prime
The world of Petrichor Prime is a captivating realm where the very fabric of nature responds to the rhythms of music. Vast forests, driven by an otherworldly force, uproot themselves and migrate across the land, leaving…
415 public creations
DrazThe Adventures Of Credunt Insulis
Credunt Insulis, an island whose ancient name whispers of faith and belief in lands long forgotten, has become a crucible of chaos and wonder. The realm trembles beneath the weight of dual catastrophes: the kingdom of…
394 public creations
EterniaMythica
The realm of Mythica is a wondrous tapestry, where the extraordinary and the mundane coexist in a delicate balance. This world is home to a diverse array of mythical humanoids and fantastical creatures, each with their…
378 public creations
Not sure where to start?
We’ve got you
Follow a guided path, grab a template, or use a free tool to make the next decision a little easier.
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Explore all worldbuilding resources →Learn Worldbuilding
Follow the journey from first premise to connected fantasy World.
✎Worldbuilding for Writers
Build a story-ready world bible whose details earn their place in the draft.
☷Use the Worldbuilding Template
Give your people, places, cultures, systems, and conflicts a useful structure.
✦Try Free Worldbuilding Tools
Create names, backstories, NPCs, creatures, and the next piece of your setting.
A few things people usually ask
Worldbuilding app questions
Worldbuilding software helps creators develop and organize the people, places, history, rules, and other details of a fictional setting. Summon Worlds adds visible connections between those details so they remain part of one navigable World.
Start with the part you already have
One Character is enough
You do not need the map, timeline, magic system, and twelve dynasties figured out. Start with the idea that is already alive. The rest of the World can grow around it.
Free to start · Available on iOS and Android