Tenth Room Studio Support
Borderbrush app icon

Borderbrush

Paint the world. Then let it fight.

Download on the App Store

US$4.99, one time. No ads, no in-app purchases, no tracking.

For iPhone, iPhone Duo and iPad with iOS or iPadOS 26 or later.

Borderbrush on iPhone Duo: the controls in a side panel beside the map

How it plays

Paint. Press play. Share the war.

A new nation called Northern Union painted across western Europe
Paint the real world.197 countries and more than 5,000 provinces. Merge, split, rename, recolor, and design every flag.
One country against the world, every nation in its flag, the top five and their armies at the top
Press play.Nations declare war, ally, revolt and collapse on their own. Step in with god tools whenever you like.
The video export sheet with a preview of the war's ending
Share the war.Every war and every painting exports as a vertical video with sound, with a camera that follows the fighting.

The game

A sandbox for history nerds and map lovers.

Start from today's world, from one country against everyone else, from ten empires that rise again out of today's countries, or from a blank globe. Then watch who ends up ruling the world, year by year.

Screenshots

Today's world with every country filled with its flag The Roman Empire back around the Mediterranean, mid-war One nation rules the world after 153 years The flag designer

Support

Questions

How do I paint?

Pick a nation in the bar at the bottom (or tap + for a new one), choose Brush or Fill, and drag over the map. Pick takes a nation from the map, Erase clears land, and Move lets you look around without painting. Undo and Redo are at the top.

How do I show flags on the map?

Tap Flags, just above the bar at the bottom while you paint, or the flag button at the top during a war. Every nation then fills its land with its flag. Real countries use their real flags; for your own nations, tap the nation's name and design its flag.

How does the war work?

Tap Run. Nations attack their neighbors, make peace, form alliances and revolt on their own; a nation that loses its capital can fall apart. Change the speed at the bottom, or use the god tools (Bless, Revolt, Peace, Split, War) and tap a nation.

How do I make a video?

Tap the share button at the top, or Export timelapse when a war ends. Choose the length, the camera (Follow, World or My view), sounds and flags, then Export video. Save it to Photos or share it anywhere.

Do my maps sync between my iPhone and iPad?

Yes, if both are signed in to the same iCloud account. Your newest maps sync on their own; a painting timelapse stays on the device where you painted it.

Is it made for iPhone Duo?

Yes. Open the phone and the controls sit in a side panel beside the map. Fold it and the game carries on on the cover screen, without losing your war.

Why is a border drawn this way?

The map is a game board, not a statement on any border dispute. It comes from Natural Earth map data. Some small countries, such as Vatican City and Tuvalu, are too small to appear at the map's size.

Need help? Email borderbrush@tenthroomstudio.com and include your device model and iOS version. We read every message.