About TopoXY

TopoXY turns your phone into a pocket surveying toolkit. It converts coordinates between national grids and GPS, measures distances, bearings and areas, and analyzes terrain, with the same engineering-grade precision on iOS and Android.

What TopoXY does

• Converts coordinates between Stereo 70 (EPSG:3844) and WGS84 (GPS) to centimeter-level agreement with PROJ and QGIS
• Measures distance, bearing, area and perimeter between surveyed points
• Analyzes terrain slope between two points using elevation data
• Imports points in bulk from CSV or TXT files
• Shows standard and satellite maps, and navigates to any point with Google Maps or Waze

Countries and coordinate systems

TopoXY supports the national grids of six EU countries:

• Romania: Stereo 70 (EPSG:3844)
• Poland: PUWG 2000
• Czechia and Slovakia: S-JTSK (Krovak)
• Italy: Gauss-Boaga
• Germany: ETRS89 / UTM

Built for surveyors

TopoXY works without an account: you open it and get to work. The interface is available in English, Romanian, Polish, Czech, Slovak, Italian and German, and coordinates are formatted the way each country expects them.

A TopoXY Pro subscription unlocks advanced measurements, the expanded map, terrain analysis, and removes ads.

IMPORTANT: TopoXY is an engineering aid. Coordinate conversions and terrain data are provided for informational purposes. For official cadastral or legal work, always verify results with a licensed surveyor and certified equipment.

Who makes TopoXY

TopoXY is built and operated by iosallapps, a small independent team focused on precise, no-nonsense tools for the surveyor community.

Contact

Email: iosallapps@icloud.com
Website: https://topoxyapp.com

Thank you for choosing TopoXY!