Alternate history games used to mean one thing: grand strategy with a scenario menu. Then AI-native games arrived and split the genre in two — hand-authored divergence you explore versus generated divergence that improvises around you. The best games in 2026 sit at every point on that spectrum.
Disclosure: Altworld is our game; every other entry is here on merit.
What is the best free alternate history game?
For free AI-native divergence, Altworld gives you 10 guest turns with no account and Pax Historia offers free nation-scale play with limits. For free nation-level experimentation without a subscription, Epoch: Alternate History on itch.io is the pick. All three are free to start; only Altworld keeps your timeline persistent across sessions.
The AI-native lane
1. Altworld — live the divergence (browser, free start)
Altworld is alternate history at eye level. Choose a researched historical moment — Viking-age Birka in 864, Bristol as the Black Death lands in 1348, Dojima's rice markets in 1702, Qajar Shiraz in 1820, Chihuahua's rails in 1910 — or forge your own point of divergence from a text pitch. Then live in it as a person while the simulation tracks factions, prices, rumors, and relationships. Strictness is a dial (strict, plausible, inspired), so the same world can be a disciplined period piece or a runaway what-if. Timelines persist across sessions, branch from snapshots, and support multiplayer — one shared alternate history for you and your friends.
- Divergence style: generated, person-scale, persistent
- Best for: "what would it actually be like to live there?"
- Price: free start (10 guest turns, no account), daily free Candles
2. Pax Historia — AI grand strategy
The game that made AI alternate history a mainstream hobby. Pick a nation and a year, type your moves in natural language — alliances, threats, betrayals — and AI plays the rest of the world back at you. A huge preset community keeps the scenario well deep. It's the map-game half of what Altworld does at street level; plenty of players run both.
- Divergence style: generated, nation-scale
- Best for: freeform diplomacy and map-level what-ifs
- Price: free to start, with limits
3. Chronostates — one question, one timeline
Type a what-if question and Chronostates generates a coherent divergent timeline you can steer, event by event, with history accumulating as canon. The most "interactive book" of the AI lane — small team, fast iteration, genuinely clever.
- Divergence style: generated narrative timeline
- Best for: exploring a single divergence deeply and quickly
- Price: free to start
4. AltHistAI — famous turning points, simulated
A scenario menu of history's greatest hinges — 1492, Hastings, the World Wars, the American Civil War — each simulated by AI as you nudge the variables. Lighter than the rest of the lane, and the fastest way to test-drive a divergence idea.
- Divergence style: generated, scenario-guided
- Best for: quick what-if sessions on famous events
- Price: free in the browser
The grand strategy lane
5. Hearts of Iron IV — the modded masterpiece
HOI4 plus its mod scene is the largest body of playable alternate history ever assembled: Kaiserreich (Germany won WWI), The New Order, Red Flood, and hundreds more. Authored, systemic, endlessly deep. The AI improvises nothing — and the mods prove how far authored divergence can go.
- Divergence style: authored scenarios + systemic sandbox
- Best for: WWII-era warfare and the genre's best total conversions
- Price: paid (Steam)
6. Crusader Kings III — dynastic chaos engine
CK3 generates alternate history as a byproduct: play a dynasty across centuries and watch plausible-but-wrong timelines emerge from marriages, murders, and bad luck. The closest authored-systems game to "emergent" divergence — and the funniest.
- Divergence style: emergent from character simulation
- Best for: medieval what-ifs written by scheming relatives
- Price: paid (Steam)
7. Europa Universalis IV — the long arc
Four centuries, every nation, any outcome: EU4 remains the broadest canvas for early-modern divergence. Aging UI, DLC sprawl — and still nothing matches its scope for "what if this tiny state had won?"
- Divergence style: systemic sandbox, 1444–1821
- Best for: century-spanning counterfactuals
- Price: paid (Steam)
8. Epoch: Alternate History — the free indie
Free on itch.io, ambitious beyond its size: nation simulation from early societies to modernity, with citizens simulated underneath. Rough edges, generous spirit — the right first stop if you're not ready to pay Paradox prices.
- Divergence style: systemic sandbox, indie scale
- Best for: free nation-level experimentation
- Price: free
Which alternate history game lets you play a person, not a nation?
Altworld is the main one: you're a single person inside a persistent alternate timeline, and the simulation tracks factions, prices, and rumors around you rather than borders on a map. The grand-strategy titles put you above the map; Altworld puts you inside the history.
Compared
| Game | Lane | Scale | AI-generated? | Free option |
|---|---|---|---|---|
| Altworld | AI-native | Person in the timeline | Yes — simulated world | Yes |
| Pax Historia | AI-native | Nation | Yes — AI rivals | Yes |
| Chronostates | AI-native | Timeline narrative | Yes | Yes |
| AltHistAI | AI-native | Scenario | Yes | Yes |
| Hearts of Iron IV | Grand strategy | Nation (WWII) | No | No |
| Crusader Kings III | Grand strategy | Dynasty | No (emergent) | No |
| Europa Universalis IV | Grand strategy | Nation (1444–1821) | No | No |
| Epoch | Indie strategy | Nation | Partly | Yes |