Everything you need to know about Tresorus, our treasure hunts and how the app works.
Tresorus is a free geolocated treasure hunt app that lets you discover local heritage as a family. Guided by animated characters inspired by real history, you explore real places while solving riddles.
Yes! In 2026, Tresorus is 100% free. All quests, the souvenir photo and every feature are available at no cost.
The quests are designed for families with children ages 5 and up, but parents also enjoy the cultural and historical content. The "Did you know?" sections add a grown-up perspective on every site.
A quest lasts between 30 minutes and 2 hours depending on the trail, over 2 to 3 km on foot. Expect around 5 checkpoints with videos, riddles and discoveries, sometimes a few more.
Download the app, pick a quest and head to the starting point. GPS guides you to each stage. At every point of interest, an animated character appears on video to tell the story of the place, and then you solve a riddle to move on. At the end, you earn a badge and can take a souvenir photo.
No! You download the content (videos and data) before leaving via Wi-Fi. After that, everything works offline thanks to your phone's GPS. Perfect for areas without signal.
An "I'm here" button is available at every stage to confirm your position manually, especially in forests or areas with a weak GPS signal.
Tresorus is available on iPhone (iOS 15+) and Android (8+). A GPS is required. The app is not available on the web for gameplay, because GPS stops working when the screen turns off.
Each quest needs between 50 and 150 MB for videos and data. A message warns you if space is low. Data is automatically deleted after 30 days.
Two quests are available in Doussard: "Le Trésor du Port Englouti", in which you follow Gaspard, a 17th-century merchant inspired by Gaspard Stockalper, through 5 historic stages, and "L'Or Blanc des Marais", an adventure on the trail of salt smugglers in 1695. A new quest in Saint-Jorioz, focused on the pile-dwelling villages listed as UNESCO World Heritage, is in the works.
The starting point is in front of the Maison Forte de Blain in Doussard (74210). It's a 15th-century historic building listed as a Monument Historique (French Historic Monument), easily reached on foot from the village centre.
The Saint-Jorioz quest will let you discover the pile-dwelling villages, 6,000-year-old stilt houses submerged beneath the lake and listed as UNESCO World Heritage. The trail will take you along the beach, through the Marais de l'Enfer and the old village. A complete heritage guide is already available on our site.
Write to us directly from the app or through our social media, we reply within 24 hours.