IsItWater vs Open Topo Data
Same instrument, two spec sheets — measured, not claimed.
IsItWater vs Open Topo Data: common questions
Which is more reliable, IsItWater or Open Topo Data?
On our scheduled checks, Open Topo Data leads on measured uptime — IsItWater at —% versus Open Topo Data at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Do IsItWater and Open Topo Data need an API key?
Open Topo Data needs no key, while IsItWater requires a free API key. If you want to start calling without signup, reach for Open Topo Data first.
Can I call IsItWater and Open Topo Data from the browser?
Neither sends browser-friendly CORS headers reliably, so call IsItWater and Open Topo Data from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.
Are IsItWater and Open Topo Data free for commercial use?
IsItWater has unclear commercial terms, and Open Topo Data 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.