Simulate the
Unseen
Change one moment. Rewrite everything.
Pick any turning point in history, ask “what if”, and watch AI rebuild the world that could have been.
Three steps to rewrite history
No PhD required. Just curiosity about what could have been.
Pick a Turning Point
Browse curated historical timelines — from World War I to the Cold War. Find a critical moment that shaped the world.
Ask "What If?"
Type your alternate scenario. What if the assassin missed? What if the treaty was signed? The AI takes it from there.
Watch History Rewrite
AltEra simulates a full alternate timeline — scoring chaos, tracing ripple effects, and revealing a world that never was.
Everything you need to
bend time
From ancient artifacts to Cold War standoffs — AltEra gives you the tools to explore every branch of the timeline.
Browse Historical Timelines
Dive into curated eras — World Wars, Cold War, ancient empires. Each timeline surfaces the critical incidents where history hung by a thread.
Scan Museum Artifacts
Point your camera at any museum artifact or label. Our AI vision model identifies the object, dates it, and links it to the relevant historical timeline.
Explore Community Timelines
Thousands of historians, students and curious minds have already rewritten history. Browse their alternate worlds and remix your own.
Moments that changed everything
Start here — these are the turning points where a single decision reshaped the course of civilisation.
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Historical eras
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Critical incidents
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Simulations run
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Community members
Your turn to rewrite history
Sign up free and start your first simulation in under a minute. No historical expertise needed — just imagination.