Hunt for treasures,travel through time
The free app that turns your family walks into immersive treasure hunts around Lake Annecy.
No account, no ads — your first quest in 2 minutes.
The magic, in 3 steps
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.
Choose your expedition
A salt smuggler in 1695, a pile-dwelling village from 4000 BC, the French Revolution in Talloires… Every destination hides a real forgotten story to uncover as a family.
Follow the compass in the field
Walk to a historic site and point your smartphone at the landscape. The present before your eyes, the past on your screen: characters come back to life and the ruins are rebuilt on video, right where you're standing.
Solve the mysteries
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.
Real excerpts from our quests: the present before your eyes, the past on your screen
Where will you play?
Quests around Lake Annecy and beyond — new destinations every season.
Real history — for real
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.
Every reconstruction is a documented hypothesis based on real sources — never made up.
What families say
« Passionnante immersion dans notre passé, entre vidéos et audios très instructifs. À tester absolument ! »
« C'est passionnant de découvrir l'histoire de l'incroyable lac d'Annecy. Quand on se tient là et qu'on imagine ce qu'il y avait ici il y a 6 000 ans, c'est impressionnant. Je recommande à tout le monde de suivre ces parcours. »
« Super ludique ! Même lorsqu'on connaît la région, on apprend plein de choses avec Tresorus ! »
« On vient de tester le parcours du port avec mes enfants. Ils sont déjà pressés de faire le parcours suivant. Très ludique ! Un exposé sera même réalisé par mon fils, en CE2, grâce à cette petite aventure. »
Do you manage a region or a heritage site?
Bring your heritage to life differently
Tresorus is a turnkey solution to showcase your territory, attract families and energise your trails — with no physical installation.
Let's talk about your projectHow Tresorus was born
"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.
Your questions
Is it really free?+
Yes — the app and all quests are 100% free for the public, with no hidden purchases.
Does it work without signal?+
You can download a quest ahead of time and play it offline out in the field, even in dead zones.
Are there any ads?+
No ads, no ad trackers. The experience stays focused on play and discovery.
What about my data?+
Your data is hosted in the European Union, in compliance with the GDPR. We never sell anything.
What age is it for?+
From age 4, with an adult. Quests last from 30 minutes to 2 hours depending on the route.
Free · No ads · No hidden purchases · Data hosted in the European Union
Ready for the adventure?
Download the app for free and start your first treasure hunt today.