Tattis
Jarmo Seppala Navigation iPhoneiPadiPod touch
Tattis is a free Navigation app for iPhone and iPad by Jarmo Seppala. Requires iOS 15.0. Updated October 20, 2026.
- Price
- Free
- on the App Store
- Size
- 96 MB
- Age 12+
- Updated
- Oct 20
- 2026 · v2.3
Screenshots
About Tattis
Tattis is a forecast app made for mushroom foragers that shows where and when mushrooms are likely to grow. The app combines forest type, soil, terrain and up-to-date weather into a species-specific mushroom map covering all of Finland. Map shows where they grow - Species-specific heat map based on the combined effect of growing location and weather - Daily updated forecast – the harvest follows the Finnish Meteorological Institute's weather data - Forest type layers on top: grove, herb-rich heath, mesic heath, sub-xeric heath, xeric heath, barren heath - Works offline in the forest – maps are stored on your phone, no signal required Notifications when harvest time arrives - Push notification when a species' harvest begins or improves - Choose yourself which species you want to hear about - You won't miss the best days when conditions align Personal mushroom journal - Save your own finding spots on the map as private - If you wish, share your observation to the Finnish Biodiversity Information Facility (laji.fi) with one tap - Browse your past trips and locations Comprehensive species selection - Tattis knows 32 species – all edible mushrooms recommended by the Finnish Food Authority plus other edible specialties Reliable sources - Species descriptions: Luontoportti and Arktiset Aromit - Occurrence data: Finnish Biodiversity Information Facility's open data (laji.fi) - Weather data: Finnish Meteorological Institute - Terrain and soil data: National Land Survey of Finland, Geological Survey of Finland, Natural Resources Institute Finland Privacy first - Tattis doesn't track you. Your own mushroom spots are saved only on your phone, unless you decide to share them to laji.fi. Basic use of the app doesn't require signing in. Remember: never eat a mushroom you're not sure about identifying. Tattis helps you find them, not identify them. Terms of Use: https://tattis.life/en/terms/ Privacy Policy: https://tattis.life/en/privacy/
What’s new
Version 2.3 · Updated October 20, 2026
• New forest view (Pro) replaces the heatmap: woods coloured by today's forecast, each with a page of trees, rain and protected areas • Redesigned diary: a basket that fills with this season's finds, and finds by day with your photos • Redesigned species page: where the season stands, and the weather against the species' own good range • All mushroom illustrations redrawn • Seasons refined for seven species • Smaller fixes
App privacy
The developer, Jarmo Seppala, reported these privacy practices to Apple.
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Purchases: Purchase History
- Location: Coarse Location
- Contact Info: Email Address, Name
- User Content: Photos or Videos
Used for: App Functionality
Data Not Linked to You
The following data, which may be collected but is not linked to your identity, may be used for the following purposes:
- Diagnostics: Crash Data, Other Diagnostic Data
Used for: App Functionality
Alternatives to Tattis
Looking for apps like Tattis? Here are 6 similar apps on the App Store. The highest rated is Karttaselain - Maastokartta (4.5/5), and all 6 are free to download.
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My Mushroom Spots
4.2
-
BRDNG
-
Luontoon
-
Karttaselain - Maastokartta
4.5
-
Kouvola public transport
-
Hailuoto
| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Tattis | – | Free | October 20, 2026 | |
| My Mushroom Spots | 4.2 / 5 (6) | Free | Sep 9, 2026 | Compare |
| BRDNG | – | Free | Oct 19, 2026 | Compare |
| Luontoon | – | Free | Sep 3, 2026 | Compare |
| Karttaselain - Maastokartta | 4.5 / 5 (6) | Free | Oct 16, 2026 | Compare |
| Kouvola public transport | – | Free | May 7, 2026 | Compare |
| Hailuoto | – | Free | Oct 7, 2026 | Compare |
Compare Tattis with the top alternatives: ratings, updates, ASO score and keyword gaps →