Was curious what was being used for geocoding, but it is just a hard-coded list of ~40 cities with their lat/longs.

These seem to be the most generous (free) geocoding api's

Forward geocoding (location name to lat/long)

- Open Meteo 10,000/day: https://open-meteo.com/en/docs/geocoding-api

Reverse geocoding (lat/long to location name)

- OpenWeatherMap 1,000,000/month: https://openweathermap.org/api/geocoding-api

- Also has forward geocoding; seems more comprehensive than Open Meteo DB.

Looks similar to the iOS/macOS photos app

Might be neat for a service like Earthcam or Insecam, or packaged as an electron app to view folders of photos by EXIF location.

Really cute app here !!