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Haystack vs Vercel AI SDK

An independent, evidence-weighted trust comparison of two agent frameworks — ranked on verifiable signals, not popularity.

Haystack ranks higher with an HVTrust score of 94.3 vs 91.9/100 . HVTrust reflects supply-chain safety, transparency, maintenance, and adoption — weighted by how much verifiable evidence exists.
SignalHaystackVercel AI SDK
HVTrust score94.391.9
Evidence gradeAA
Registry stateListedListed
Safety / Integrity (25)23.020.2
Identity / Provenance (18)18.018.0
Transparency (17)15.613.8
Maintenance (20)20.019.9
Adoption (20)17.720.0
GitHub stars25.5k24.6k
Weekly downloads206,73913,018,482
Last push2026-06-042026-06-02
LanguagePythonTypeScript
OSSF Scorecard8.46.2
Review flags——
Recent change2026-06-04: HVTrust up 4.1pts (90.2 → 94.3)2026-06-01: HVTrust up 3.1pts (88.9 → 92.0)
Full Haystack report → Full Vercel AI SDK report → All Agent Frameworks →