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Pendo Feedback API vs SLF

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

APIPendo Feedback APIDYING67SLFHEALTHY98
Uptime · 30d
Uptime · 90d53.9%100%
Uptime · 30d21.7%100%
P50 · ms517213
P95 · ms812668
AuthapiKeynone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree — static file, no key
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Pendo Feedback API vs SLF: common questions

Which is more reliable, Pendo Feedback API or SLF?

On our scheduled checks, SLF leads on measured uptime — Pendo Feedback API at 53.9% versus SLF 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, Pendo Feedback API or SLF?

SLF has the lower median latency in our checks — Pendo Feedback API responds in 517 ms versus SLF at 213 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 Pendo Feedback API and SLF need an API key?

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

Can I call Pendo Feedback API and SLF from the browser?

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

Are Pendo Feedback API and SLF free for commercial use?

Pendo Feedback API has unclear commercial terms, and SLF 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.