GeoJS vs Postcodes.io
Same instrument, two spec sheets — measured, not claimed.
GeoJS vs Postcodes.io: common questions
Which is more reliable, GeoJS or Postcodes.io?
Both are neck-and-neck — GeoJS and Postcodes.io each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.
Which is faster, GeoJS or Postcodes.io?
Postcodes.io has the lower median latency in our checks — GeoJS responds in 107 ms versus Postcodes.io at 33 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
Do GeoJS and Postcodes.io need an API key?
Neither needs a paid key — GeoJS is callable with no signup, and Postcodes.io is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call GeoJS and Postcodes.io from the browser?
Yes — both GeoJS and Postcodes.io send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are GeoJS and Postcodes.io free for commercial use?
GeoJS has unclear commercial terms, and Postcodes.io has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.