COGO: Land Survey Calculator
Traverse Closure, Area & CAD
About
This app provides essential land surveying calculations offline, including traverse closure, area computation, and curve solving. It supports various input units and offers CAD export for seamless integration with other design software. An AI assistant is available for natural language queries.
What's New in COGO
2.8
October 31, 2026
• Survey Quick Tools widget: open Unit Converter, Grade & Slope, Angle Calculator and Curve Solver from your Home Screen. • Field Reference widget: common length and area conversions at a glance, with one-tap access to Unit Converter. • Search calculators by name or description on iPhone and iPad. • Widgets and search support English and Spanish.
MoreSubscriptions & In-App Purchases
COGO Pro Monthly
Unlock all COGO Pro features, billed monthly
Developer apps
FAQ
What can COGO calculate?
COGO can calculate traverse closure, enclosed area, horizontal curves, and perform various geometric intersections. It also includes unit and coordinate system converters, and can generate metes-and-bounds descriptions.
Does COGO work offline?
Yes, COGO is designed for 100% offline use. Your job data and points remain on your device, ensuring privacy and accessibility without a network connection.
What export formats does COGO support?
COGO supports exporting data as CSV, DXF (AutoCAD R12 compatible), and a one-page PDF report. These export options are available for free.
What units can I use with COGO?
You can enter and work with legs in meters, feet, US survey feet, or links. The unit converter also supports acres, hectares, varas, and gons.
How does COGO handle coordinate systems?
COGO supports UTM conversion and State Plane (SPCS83 and SPCS2022 preview). It can convert between latitude/longitude and grid coordinates, including scale factors and convergence.
What are the subscription options for COGO Pro?
COGO Pro offers weekly, monthly, and yearly subscription plans. These are priced at $2.99/week, $4.99/month, and $39.99/year respectively.
Does COGO have ads?
No, COGO is designed to be ad-free. The app emphasizes privacy and does not contain advertisements or tracking.
What is the AI assistant in COGO?
COGO includes an on-device AI assistant named 'Theo' (leveraging Apple Intelligence). You can ask it questions in plain English to help with calculations or app usage.
