TopoXY: Coordinate Converter

TopoXY is a coordinate toolkit for surveyors, civil engineers and GIS professionals working in Romania, Poland, Czechia, Slovakia, Italy and Germany.

Pick your country once. TopoXY loads the right coordinate reference system and keeps it for every conversion, calculation and map you open.

SUPPORTED COORDINATE SYSTEMS
- Romania: Stereo 70, EPSG:3844
- Poland: PUWG 1992, EPSG:2180
- Czechia and Slovakia: S-JTSK / Krovak, EPSG:5514
- Italy: Gauss-Boaga, EPSG:3004
- Germany: ETRS89 / UTM zone 32N, EPSG:25832

Conversions run on your iPhone through the PROJ library, the same engine behind professional desktop GIS. They need no signal and no account, which matters when the site has no coverage. The map and elevation lookups do query online services, so those send the position you are viewing.

WHAT YOU CAN DO
- Convert between your national grid and WGS 84, both directions
- Enter several points and convert them together
- Measure distance and azimuth between two points
- Calculate area and perimeter for a set of points
- See every point on an interactive map: standard, hybrid or satellite
- Open any point in Apple Maps for navigation
- Read terrain slope and gradient at a location

ABOUT ACCURACY
Each country has its own accuracy tier and the app shows yours before you convert. Italy ships without an NTv2 grid, so results there sit in the widest tier. Check a control point you already know before you rely on any tool, this one included. We would rather you test us than trust us.

BUILT FOR THE FIELD
Seven languages: English, Romanian, Polish, Czech, Slovak, Italian and German. Dark mode. Every result two taps away, because you are holding a phone in one hand.

Download TopoXY and stop retyping coordinates into a desktop you left at the office.

SUBSCRIPTION DETAILS
TopoXY Pro is an auto-renewing subscription. New subscribers start with a 3 day free trial. After the trial it renews weekly, or monthly if you pick that plan, at the price shown in the app for your region, charged to your Apple Account at confirmation of purchase. It renews automatically for the same price and period unless auto-renew is turned off at least 24 hours before the end of the current period. Manage or cancel any time in Settings, tap your name, then Subscriptions. Any unused portion of a free trial is forfeited when you buy a subscription.

Privacy Policy: https://topoxyapp.com/privacy.html
Terms of Use: https://topoxyapp.com/terms.html
EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/