Universalis vs xkcd
Same instrument, two spec sheets — measured, not claimed.
Universalis vs xkcd: common questions
Which is more reliable, Universalis or xkcd?
On our scheduled checks, xkcd leads on measured uptime — Universalis at 96.1% versus xkcd at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, Universalis or xkcd?
xkcd has the lower median latency in our checks — Universalis responds in 215 ms versus xkcd at 164 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 Universalis and xkcd need an API key?
Neither needs a paid key — Universalis is callable with no signup, and xkcd is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call Universalis and xkcd from the browser?
Only Universalis is browser-friendly — it returns CORS headers over HTTPS. xkcd needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are Universalis and xkcd free for commercial use?
Universalis has unclear commercial terms, and xkcd is personal/non-commercial only. 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.