
LetsGeo
Geological Field Notes
Only for iPhone
Free · In-App Purchases · Designed for iPhone
iPhone
Let’sGeo — professional geological field logging app
Let’sGeo is a professional offline field tool for geological and geotechnical logging, drilling operations and mineral exploration.
Designed for real field and core shed work, it combines geological descriptions, structural measurements and drilling data in a single, structured workflow — fully offline.
Key features
Geological & structural logging
• Field points with lithology, mineralization, alteration and weathering
• Standardized geological codes with free-text descriptions
• Built-in compass and clinometer for dip and dip direction
• Structural elements: bedding, joints, faults, shear zones and veins
• Vein parameters: thickness, mineralogy and density
• Stereonet (Schmidt & Wulff) visualization
Geotechnical logging in drillholes
• Two-level workflow:
– Single structural records linked to depth
– Interval-based geotechnical domains
• Core recovery, TCR, SCR and RQD
• Rock mass parameters and fracture angle classes
• Core boxes with depth-linked photo documentation
Drilling & sampling
• Drillhole runs and recovery tracking
• Interval sampling with full metadata
Mapping & GIS
• GPS points and drillholes
• Coordinate input and conversion (WGS-84, UTM, Gauss–Krüger)
• GPS track recording
• KMZ layers with map drawing tools
Media & data
• Photos, video and audio linked to observations
• Offline-first: all data stored locally
• Full project export/import and merge between devices
Privacy
Let’sGeo stores all data locally on your device.
Nothing is uploaded or shared unless you explicitly choose to export it.
Privacy Policy: https://letsgeo.world/privacy.php
Terms of Use (EULA): https://letsgeo.world/terms.php
Ratings & Reviews
This app has not received enough ratings or reviews to display an overview.
What’s new
• Added project-level dropdown lists for geological coding fields
(lithology, mineralisation, alteration, weathering, mineralogy where applicable)
• Dropdown lists can be enabled per project or switched off to allow free text input
• Various minor bug fixes and stability improvements
The developer, Letsmine SIA, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Letsmine SIA
- Size
- 17.4 MB
- Category
- Productivity
- Compatibility
Requires iOS 18.5 or later.
- iPhone
Requires iOS 18.5 or later. - Mac
Requires macOS 15.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.5 or later.
- Location
- This app may use your location even when it is not open, which can decrease device battery life.
- Languages
- English
- Age Rating
4+
- 4+
- Contains
User-Generated Content
- In-App Purchases
Yes
- Full Access Monthly $4.99
- Copyright
- © 2025 SIA Letsmine. All rights reserved.