The free app that turns your family walks into immersive treasure hunts around Lake Annecy.
Kids hunt for treasure
Parents discover history
Based on real historical research
Right where it actually happened
An adventure for the kids. A journey through time for the parents.
No more kids dragging their feet or the dreaded "Are we there yet?" With Tresorus, they're the ones tugging at your sleeve to get to the next stage.
A quest is a 30-minute to 2-hour walk with 4 or 5 points of interest to discover. At each stage, you observe the place as it is today — then the app kicks in: you see the same spot hundreds or thousands of years earlier.
The present before your eyes. The past on your screen.
The same place, centuries apart.
No more isolating smartphones: here, it becomes a magical spyglass that pushes kids to observe the real world and soak up local history.
Every quest is the result of rigorous historical research. We recreate the original look of the sites on video, right where you're standing — not fiction, but a documented hypothesis.
A salt smuggler in 1695, a pile-dwelling village from 4000 BC, a baron on the run with his treasure… Every destination hides a real forgotten story to uncover as a family.
Walk to a historic site and point your smartphone at the landscape. The present before your eyes, the past on your screen: the ruins are rebuilt on video, right where you're standing.
Observe the real architecture around you, decode the clues and solve the riddles. Every correct answer brings you closer to the treasure — and to your hero badge.
"It started with notes hidden under stones, riddles cobbled together on weekends with Max."
Mahé lives in Doussard, on the shores of Lake Annecy, with his 5-year-old son Max. One winter day, through the magic of generative video, he made a pirate ship appear in the port of Doussard. Max saw the real port, empty — and on the screen, the same port, but with a ship anchored exactly where he stood.
The idea of sharing this magic came naturally. Tresorus was born.
Download the app for free and start your first treasure hunt today.