LetsGeo

Geological Field Notes

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Let’sGeo - Professional Geological Field Logging App Let’sGeo is an offline-first app for geological and geotechnical logging, drilling and mineral exploration. Designed for fieldwork and core sheds, it combines geological observations, structural measurements, drilling data and mapping. Works fully offline, with optional upload to your own servers. Key Features Geological & structural logging - Field points: lithology, mineralization, alteration and weathering - Geological codes and free-text descriptions - Compass and clinometer for dip and dip direction - Bedding, joints, faults, shear zones and veins - Vein thickness, mineralogy and density - Schmidt & Wulff stereonets Drilling & sampling - Drillhole runs and recovery tracking - Interval sampling with metadata - Geological samples linked to logging intervals Geotechnical logging - Single structural records linked to depth - Interval-based geotechnical domains - Core recovery, SCR and RQD - Rock mass parameters and fracture angle classes - Core boxes with depth-linked photos Mapping & GIS - GPS points and drillholes - WGS-84, UTM and Gauss-Krüger coordinates - GPS tracks and accuracy recording - Custom markers, colors and visibility controls - Compass-oriented maps with live azimuth - Distance and true bearing to points and drillholes - KMZ layers with drawing and editing tools - KMZ layer ordering and management - Offline satellite imagery - Spectral maps for mineral exploration - SWIR lithology, clay alteration and iron oxide composites - Download spectral scenes for offline interpretation Reference Collection - Project-based geological reference collections - Rock photos, descriptions and geological notes - Import and export between projects and devices - Reference image similarity search - Compare field photos with reference samples - Find similar rocks using image analysis of color, grain characteristics, textures and veins Media & data - Photos, video and audio linked to observations - Geological field sketch sheets - Photo annotation and markup - Local offline data storage - Full project export and import - Project Database Archive export - Merge archives from multiple devices - Cross-platform exchange between Android and iOS Connect DB - Your Own Server - Direct project upload to your PostgreSQL database - Optional S3-compatible storage for media - Use your own company or project infrastructure - Multiple geologists can upload to one shared project - Incremental upload: add new and update changed records - Unchanged records are skipped - Existing server data is preserved - Manual, one-way upload without automatic downloads - No developer-operated cloud required Privacy & Data Control Let’sGeo works offline and stores project data locally. Connect DB optionally uploads data directly to your own PostgreSQL database and S3-compatible storage. No developer-operated cloud is required. Your data. Your infrastructure. Your control. Privacy Policy: https://letsgeo.world/privacy.php Terms of Use (EULA): https://letsgeo.world/terms.php

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What's New - Export individual drillholes as ZIP archives, including associated data and media. - Improved PostgreSQL and S3-compatible Media Storage uploads. - Improved duplicate detection and data merging when multiple geologists work on the same project. - Enhanced data consistency and protection of existing records. - Updated User Manual and various bug fixes.

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.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Seller
    Letsmine SIA
    Size
    92.7 MB
    Category
    Productivity
    Compatibility
    Requires iOS 18.6 or later.
    • iPhone
      Requires iOS 18.6 or later.
    • Mac
      Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.6 or later.
    Location
    This app may use your location even when it isn’t open, which can decrease device battery life.
    Languages
    English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    © 2025 SIA Letsmine. All rights reserved.