Location 1
The Haughty Strays
Connected to Petrichor Prime
Connected 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 →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 2
The Shadowlands
Connected to Petrichor Prime
Location 3
The Crying Angel
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 behind parched deserts in their wake. In this mystical landscape, prophecies are not handed down from on high, but rather crowdsourced and updated regularly, as the collective wisdom of the people shapes the course of their destiny. Rebellions and revolutions bloom in the libraries, where the weaponization of history has become a powerful tool in the hands of the people. At the heart of this world, an ancient ferry surfaces, its silent guardians demanding not gold or silver, but a simple act of kindness, before they will grant passage to those who seek to cross the divide.
408 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 own unique abilities and customs. Elves, dwarves, and halflings live in harmony, their villages nestled amidst rolling hills and ancient forests. Mighty dragons soar through the skies, their scales glittering like gemstones, while griffins and unicorns roam the land, their presence a testament to the realm's enchanted nature. Magic is a tangible force here, flowing through the veins of the land and its inhabitants, fueling the extraordinary feats and abilities that define this realm. Adventurers from across the world seek to explore Mythica, drawn by the promise of ancient treasures, legendary quests, and the chance to witness the extraordinary firsthand.
355 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 King's Stand fights desperately against the unholy forces of the vampire empress Moriah and her legions of nocturnal abominations, while since the demon lord Sed Sugere unintentionally released Lucifer from his prison, the golden dragon of pride and destruction wages a war above the scarred landscape, the dragons of sins wage an apocalyptic battle against the celestial Archangels of the Cosmic Trinity, The island itself, adorned with blood-red sunsets that paint its black sand shores in crimson hues, sprawls across towering forests and vast canyon plains that would otherwise be considered paradise. However, the convergence of these titanic conflicts has warped the very fabric of magic that permeates the land, causing spells and enchantments to behave unpredictably and manifest in startling ways. Reality bends and fractures in unexpected patterns, that sometimes transforming even the most reliable arcane traditions into forces of beautiful unpredictability, the seas around the island are also strongly effected by such interference from the dragons and angels war making only the most experienced captains come close to the island in sea vessels. For those who hunger for perilous adventure and are willing to brave a land filled turmoils and equal measures of beauty then the island of Credunt Insulis is for you.
330 public creations
Not sure where to start?
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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