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Redis vs pgvector

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Vector Databases · verified 13 Aug 2026

RedisRediscurrent
pgvectorPostgreSQLcurrent
3 slots left
SpecificationRedispgvector
SummaryIn-memory, so very fast and RAM-bound.Vectors inside the database you already run.
IndexHNSW, FLATHNSW, IVFFlat
Hybrid searchYesYes, with SQL
HostingSelf-host and managedSelf-host or any managed Postgres
LicenceRSALv2 / SSPLPostgreSQL
p50 latency5ms~15ms
CategoryVector DatabasesVector Databases
OfficialRedis ↗PostgreSQL ↗

Highlighted rows are where these differ.

Redis

  • Practical to roughly 10 to 100 million vectors
  • You are paying for RAM, which sets the ceiling

Best for caches and hot vector sets.

Full spec sheet →

pgvector

  • One database for vectors, rows and joins
  • The honest default: reach for something else only when this stops working

Best for almost everyone, until scale says otherwise.

Full spec sheet →