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ListLoco API vs Userstack

Same instrument, two spec sheets — measured, not claimed.

APIListLoco APIHEALTHY100UserstackHEALTHY93
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms127443
P95 · ms4433029
AuthnoneapiKey
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

ListLoco API vs Userstack: common questions

Which is more reliable, ListLoco API or Userstack?

On our scheduled checks, ListLoco API leads on measured uptime — ListLoco API at 100% versus Userstack at 99.02% 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, ListLoco API or Userstack?

ListLoco API has the lower median latency in our checks — ListLoco API responds in 127 ms versus Userstack at 443 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 ListLoco API and Userstack need an API key?

ListLoco API needs no key, while Userstack requires a free API key. If you want to start calling without signup, reach for ListLoco API first.

Can I call ListLoco API and Userstack from the browser?

Only Userstack is browser-friendly — it returns CORS headers over HTTPS. ListLoco API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are ListLoco API and Userstack free for commercial use?

ListLoco API has unclear commercial terms, and Userstack 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.