GridConvertPro's answer

GridConvertPro converts between all major coordinate formats — DD, DMS, DDM, UTM, MGRS and Plus Codes — simultaneously on one screen, with every format updating live as you type. It also bundles a full navigation toolkit (distance, bearing, rhumb line, magnetic declination, marine speed-time-distance, sunrise/sunset) and runs every core calculation locally in your browser, so your coordinates never leave your device. No sign-up, no installation.

RepDB's answer:

RepDB is sold as a one-time download, not a metered API — you own the JSON/SQLite data and WebP images outright, with no rate limits, no per-request billing, and no risk of the vendor cutting off access. It's also the only dataset in this space with EN/DE/ES translations, transparent (alpha-channel) images with no watermark, muscle-group highlighting, safety/goal tags, and looping animations on the higher tier.

GridConvertPro's answer

It's completely free, needs no account, and shows every coordinate format at once instead of one conversion at a time. All core math runs client-side for privacy. It goes beyond plain conversion with marine and field-navigation tools — rhumb line, NATO mils, magnetic declination, terrain elevation — that most free converters don't offer, on a clean interactive map.

RepDB's answer:

Most alternatives are subscription APIs — you pay monthly, you're capped on requests, and ExerciseDB's terms of use explicitly forbid caching or storing the data at all, so every image render is a live paid API call. RepDB is the opposite: pay once, download the files, self-host with zero ongoing dependency. It's also the only option offering true DE/ES localization and transparent images instead of a white box behind every exercise.

GridConvertPro's answer

Surveyors, GIS professionals, drone and RC pilots, sailors and marine navigators, hikers and geocachers, search-and-rescue teams, amateur radio operators, and anyone who needs to quickly translate a coordinate into the format someone else asked for.

RepDB's answer:

Solo developers and small teams building fitness or workout-tracking apps (iOS, Android, web) who need licensed exercise images and structured exercise data, but don't want to build their own media pipeline or depend on a rate-limited third-party API.

GridConvertPro's answer

GridConvertPro was born out of pure frustration. I was tired of juggling ten different converters and websites just to get a coordinate into the right format — one site for UTM, another for MGRS, a third for Plus Codes, each cluttered with ads or hiding behind a signup. So I decided to build a single tool that does everything in one place: paste a coordinate once and get every format instantly, plus the navigation calculations I kept needing. It started as a simple converter and grew into a complete toolkit.

RepDB's answer:

RepDB grew out of a consumer workout app its creator was building solo. Sourcing exercise images and data meant either paying for a subscription API with usage caps and no caching rights, or producing everything from scratch. The illustrated, multi-language dataset was built for us first, then split out as its own product once it became clear other indie developers had the same problem and preferred to buy the data outright rather than rent it through an API.

GridConvertPro's answer

A static browser app built with vanilla JavaScript, HTML and CSS. Mapping uses Leaflet with OpenStreetMap/CARTO tiles; coordinate math uses proj4 and the mgrs library; magnetic declination uses a WMM spherical-harmonic model computed in-browser. Hosted as a static site behind Cloudflare.