SexyTopo is a developing Android application that aims to start where PocketTopo left off.  It will run on your phone or a tablet, and is best used in conjunction with a modified Leica Disto X310 (making it a DistoX2 to cavers).  SexyTopo is free, but you must buy your own disto, upgrade kit and computing device.

Still has a few unfinished features and rough edges, but is developing rapidly.  Not yet ready for 'production surveying'.


  • Rapidly collect raw survey data and sketch around it (just draw, no Therion symbolic palaver!)
  • Many actions can be initiated from the sketch view (maintains focus on the task, not the application)
  • View the entire cave or just the current survey trip
  • Android devices are readily available (models with a precise stylus required, such as Samsung Note 3 or 4)
  • By default, sketches imported to Therion enable a permanent comparison of field notes with final drawing

SexyTopo Web Sites

Download from Google Play Store

SexyTopo Facebook GroupSexyTopo GitHub page.

Comparison of SexyTopo with similar applications.  Therion In Cave Mapping wiki page.

DistoX, SexyTopo and Therion wiki page.


DistoX2 Quick Reference

Related Applications

Therion Survex

Projects that use SexyTopo

Just some tentative experimentation in and around Middle Earth so far.

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Last updated on April 30, 2020
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