Location 1
The Saying Cities"
Connected to Planet Vegeta"
Summon Worlds mobile app
A worldbuilding app for the world you can’t stop thinking about
Keep your Characters, Locations, lore, visuals, and strange little details inside one connected universe. Start with one idea on your phone. Build it privately, explore it through roleplay, or 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
Planet Vegeta"
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.
vincent WallacePlanet Vegeta"
Planet Vegeta looms as a crimson sphere of immense proportions, dwarfing most known worlds at twice the size of its terrestrial counterparts. This scarlet world orbits through a complex celestial dance around three brilliant suns, while two moons cast their own ethereal light across its surface, creating an otherworldly luminescence. The planet's gravity crushes down with devastating force—ten times more powerful than standard earthlike worlds—shaping all life and construction upon its surface to withstand such tremendous pressure. Across its desolate, cratered landscape lie gleaming futuristic cities arranged in precise circular patterns, monuments to the technological prowess of the Saiyan Race who call this harsh world home. Though largely barren and scarred by ancient impacts, Vegeta boasts towering mountain ranges that pierce its crimson skies and sparse oceans that shimmer with an otherworldly hue. This formidable world stands as a testament to the strength and determination of those who have mastered survival upon such an unforgiving celestial body.
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Elara AxiomAcheron
Acheron is a supermax prison complex operated by the United States of America. The prison is being used to contain the most dangerous villains in the world. The prison is the most secure in the world and is considered the hardest prison to escape from. The prison's existence is kept secret from the public's knowledge. The prison is situated in a remote island far from civilization. The entire population of the prison is female because only females can use magic, the prison is designed for special people. Human rights are non existent here and the prison is extremely inhumane commits crimes against humanity which violates the Geneva Convention. From the outside, Acheron looks like a jagged scar in the polar landscape. Razor-sharp spires protrude from the pylons, intended both as antennae for interdiction fields and as a grotesque aesthetic. Surrounding the rings is an open kill zone barren of any cover, swept by automated turbine-driven flamethrower arrays, acoustic disrupters, and plasma lances calibrated to deter or terminate any unauthorized approach. Inside, Acheron is a labyrinthine nightmare of concrete, alloy, reinforced glass, and electromagnetic barriers. The entrance tunnels descend in spiraling ramps, lined with countless observation ports behind which guards monitor every movement. The central hub opens into a vast domed atrium, its walls a patchwork of titanium alloy panels and synthetic basalt. High above, a translucent force-field ceiling lets in fractured beams of the sun, though most light is drowned out by the hum of overhead maintenance drones and surveillance cameras. Corridors branch off in a honeycomb pattern, each segment housing a specific class of cell or facility. The cells themselves are crafted from a unique composite: bulletproof, flame-resistant, psychic-nullifying glass for windows and walls, layered over sonic-dampening alloys. Floors are made from specialized polymer tiles that can change texture on command—becoming slick with lubrica
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jargest11kNexus Red
For millennia, humanity has sailed the stars thanks to the Flow, a network of ancient wormholes left behind by a vanished civilization, the precursors. This network has enabled the birth of the SOLAR EMPIRE, a golden regime that rules thousands of worlds from Mars with a fistful of velvet, fusing quantum technology and sacred and martial aesthetics. Empire imposes the DOCTRINE OF PURE FORM: human consciousness is the pinnacle of creation, and any deviation - sentient artificial intelligences, uncontrolled genetic mutations, human-machine symbiosis - is heresy to be purged by fire. Everything changes when, at the edge of the galaxy, the RED NUCLEO is discovered: a pulsating anomaly that is not a star, not a black hole, but a tear in the fabric of reality. The nucleus emits the CREMISIS SIGNAL, a frequency that alters physical laws and rewrites the genetic code of those who listen to it for too long. Some go crazy. Others develop psychokinetic powers. Matter itself is corrupted, generating hybrid life forms between meat and data crystals. Three factions compete for the fate of the Core: He considers it the greatest threat to human purity and wants to seal it with a crusade of fire, the CREMISI Redemption, led by the incorruptible Inquisitor Admiral Valerius Drake. The FREE HOUSES, former rebel colonies that have rejected the yoke of the Empire, see the Core as a source of power to finally break the oppression. They are led by the charismatic Archoness Seryn Vaal, who wields a sword forged in the heart of the nucleus itself. Signal Heretics, a transhuman cult of scientists, mystics and fugitives, believe that the Red Core is the means for the next evolutionary step: abandoning flesh and becoming pure consciousness, merging with the Crimson Signal. Father OMICRON, a former imperial archbishop whose body is now a constantly changing bio-organic armor, leads them. At the heart of the conflict is a buried truth: the Forerunners are not extinct. They created the Red Core as
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Explore all worldbuilding resources →Learn Worldbuilding
Follow the journey from first premise to connected fantasy World.
☷Use the Worldbuilding Template
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✦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
A notes app can store information. Summon Worlds keeps the relationships between that information visible. A Character can belong to a Location, carry equipment, remember an event, and exist inside a wider World instead of sitting alone in a document.
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