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PostStack vs SalesLoft Platform

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

APIPostStackNEW—SalesLoft PlatformNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

PostStack vs SalesLoft Platform: common questions

Which is more reliable, PostStack or SalesLoft Platform?

On our scheduled checks, SalesLoft Platform leads on measured uptime — PostStack at —% versus SalesLoft Platform 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 PostStack and SalesLoft Platform need an API key?

Both ask you to authenticate — PostStack uses an API key and SalesLoft Platform uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call PostStack and SalesLoft Platform from the browser?

Neither sends browser-friendly CORS headers reliably, so call PostStack and SalesLoft Platform from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are PostStack and SalesLoft Platform free for commercial use?

PostStack has unclear commercial terms, and SalesLoft Platform 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.