# Geòlas — Geology field notebook > Geology field notebook (iPhone/iPad app by Callum MacLellan.) - Source: https://appshunter.io/ios/app/geolas/id6816610318 (this page in markdown: same URL + `.md`) - Developer: [Callum MacLellan](https://appshunter.io/developer/6807685439) - Category: Education, Reference - Price: Free - Age rating: 4+ - Requires: iOS 17.0 · 6 MB - Languages: American English - Released: 2026-10-11 - Data updated: 2026-10-31 ## What is Geòlas? Geòlas is a field notebook for geologists — professionals, students and curious amateurs — covering Great Britain. Stand at an outcrop, drop a pin, and Geòlas tells you what's underfoot: bedrock and superficial geology straight from the British Geological Survey, translated out of jargon into a plain-words explainer alongside the official terms. Log a site in seconds: GPS location, photos, samples, formations and notes, with an optional spoken note recorded on the spot. Every site keeps a running record of what you found and where. Explore curated geological localities from across Great Britain, browsable by region on a reference layer on the map — or adopt one as a site of your own. Everything you log syncs privately across your iPhone, iPad and Mac through your own iCloud account. There's no separate sign-up, no server, and no one else ever sees your notes. Geòlas is free, with no ads, no in-app purchases and no subscription. Coverage note: bedrock and superficial geology lookups currently cover Great Britain only (England, Scotland and Wales). Northern Ireland and the Republic of Ireland are not yet covered by this data source, though you can still log sites there. ## Is Geòlas safe? Not enough ratings yet to assess Geòlas. ## Is Geòlas legit? Geòlas appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Geòlas is 65 out of 100 points across 7 verification signals from App Store and developer data. ## Version history (last 2 releases) ### 1.2 — 2026-10-18 What’s new in Geòlas 1.2 Geopark information boards on the map The Lochaber and North West Highlands geopark boards now appear on the map. Tap a board to open it full screen, then zoom and pan to read the detail. Each board links to its geopark page and audio guide, and gives directions to the board. You can turn the boards on or off from the map layers, or browse them under Sites → Geoparks. See the geology before you save When you add a new site, Geòlas looks up the bedrock as soon as you place the pin, so you know what’s underfoot before you save. Geology map of the area Any site can now produce a map of the surrounding geology, 1 to 10 km across, with a colour key grouped by rock unit and age. Zoom in to read the detail, then save it to Photos, add it to the site’s notes, copy it as text or share it. Better links out The BGS Geology Viewer now opens centred on your site. New buttons open the site in OS Maps (with the grid reference copied, ready to paste) or Outdooractive. Simulations Twelve interactive simulations are now in Reference: Deep Time and the Moine Thrust. Calderas, lava flows, pyroclastic eruptions, sedimentation, metamorphism, glaciation, the rock cycle, unconformities, faults and folds, and the Parallel Roads of Glen Roy. Some are marked as a work in progress, and a Feedback button lets you say what would make them better. Visitor’s guides New guides for Siccar Point and Hutton’s Section on Salisbury Crags point out what to look for and explain why it matters. Easier reading Maps and diagrams in Reference can now be zoomed and panned. Web pages opened in the app have zoom controls. The “What this means” explainer on each site can be collapsed. Other improvements A new About section in Settings shows which version you have. Settings has been reorganised and simplified. Map buttons now show hover text on Mac and iPad. Importing a backup now brings in a site’s photos, documents and links, and skips any that are already there. Audio from a geopark page now stops when you close it. You can send feedback from inside the app. ### 1.1 — 2026-10-15 No release notes. ## More apps by Callum MacLellan - [Fonn Tunes](https://appshunter.io/ios/app/fonn-tunes/id6807685437) - [Òrain: Songbook and Chords](https://appshunter.io/ios/app/orain-songbook-and-chords/id6808541376) - [Cuimhne](https://appshunter.io/ios/app/cuimhne/id6810118316) - [Bàrdachd: Poetry & Rhyme](https://appshunter.io/ios/app/bardachd-poetry-and-rhyme/id6814727375) - [Tobar](https://appshunter.io/ios/app/tobar/id6818873213) All apps by Callum MacLellan: https://appshunter.io/developer/6807685439 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-31.*