Local Scale Factor vs UNI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Local Scale Factor
This tool calculates local scale factors and Cartesian coordinates from WGS84 GPS positions. It supports numerous local grid transformations and can convert between local postcodes and geodetic positions. It also offers map navigation to selected coordinates.
- Local scale factor calculation
- Cartesian coordinate conversion
- WGS84 GPS position input
- Local grid transformations
- Postcode to geodetic position conversion
- Map navigation
Read full descriptionHide full description
For professional surveyors and geodesists who need to know the local scale factor and Cartesian coordinates based on WGS84 GPS positions Hundreds of local grid transformations built in. A full list of available transformations can be found at https://www.nrgsurveys.co.uk/wp-content/uploads/transformations.txt Converts latitude and longitude using local ellipsoid parameters and Helmert 7 step transformations As a bonus it converts local postcodes to geodetic positions and vice versa Open Maps navigation to the selected coordinates (If available)
UNI
Read full descriptionHide full description
marXact is a young Dutch company founded to make centimeter-accurate measuring solutions easy and affordable for anyone who knows how to use a smartphone. Next to the UNI-GR2 RTK GNSS Receiver, UNI-Cloud environment, UNI-RTK Premium correction data marXact now introduces the easiest surveying app - UNI-Collect. UNI-Collect lets anyone easily survey any object, sync that data to the UNI-Cloud, and generate project data in multiple formats such as AutoCAD DWG or CSV files. After importing your data, UNI-Collect will also let you stake out any object with ease. Features: - Point surveying - Polyline surveying - Polygon surveying - Offset point surveying - Point stake-out - Polyline stake-out - Polygon stake-out - Polyline offset - Polygon offset - Extend polyline - Extend polygon - Data stored in layers with unlimited attributes - Live UNI-Cloud synchronization - UNI-Cloud backup - UNI-Cloud API connection to get the data in your own GIS tooling - WMS/WFS background layers - Remote assistance from our UNI-Support team - Location input; UNI-GR1 / GR2 - Location input; Bluetooth NMEA 3d party GNSS receiver - Location input; Internal device location - Export: DXF/DWG/CSV/GeoJSON/LandXML - Import: DXF/DWG/CSV/GeoJSON/LandXML - Survey in any CRS system - UNI-Machine Control And much more!
Screenshots
Verdict
The clearest difference is update cadence: UNI at every 9 days against Local Scale Factor's every 2 months. Local Scale Factor's advantage is iOS requirement (10.3 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Local Scale Factor ships an update every 2 months, UNI every 9 days. The most recent releases landed on October 19, 2026 and October 15, 2026 respectively.
| Parameter | Local Scale Factor | UNI |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 2 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 10.3 — better | 16.0 |
| Further details — not scored | ||
| Size | 65 MB | 89 MB |
| Age rating | 4+ | 4+ |
| Developer | NRG Surveys Ltd | marXact B.V. |
In-app purchases
Local Scale Factor
No in-app purchases
UNI
No in-app purchases
