Both companies talk about memory, context orchestration, and benchmarks. The difference is what you can verify — and what the system actually covers. RetainDB handles user memory, context assembly, and knowledge base ingestion (22 built-in connectors) with published LongMemEval scores. Supermemory makes claims without verifiable methodology.
Supermemory makes bold performance claims. RetainDB publishes verifiable scores — 88% preference recall on LongMemEval, full methodology at retaindb.com/benchmark. Compare the specifics before you decide.
Supermemory makes strong performance claims on its research pages. RetainDB publishes LongMemEval scores at retaindb.com/benchmark — 88% preference recall, 79% overall — with methodology you can verify. That's the difference between a marketing page and a proof page.
Supermemory builds on user profile objects. RetainDB labels every memory with one of 13 typed categories. When your agent asks 'what constraint has this user stated?', typed retrieval targets exactly that. Profile object retrieval can't.
Supermemory talks about context orchestration but isn't primarily a knowledge base product. RetainDB handles all three: user memory (typed, scoped, persisted across sessions), context assembly (hybrid retrieval decides what to inject per query), and knowledge base (Notion workspaces, Confluence pages, PDFs, YouTube transcripts, arXiv papers, Playwright sessions, sitemaps — 22 built-in connectors). Your agents can know the user and your product documentation in the same retrieval call.
Because you're betting engineering time and user data on it. A claim on a research page and a published LongMemEval score with methodology are different things. Read the methodology at retaindb.com/benchmark and evaluate it yourself.
Depends on your bottleneck. If retrieval latency is the problem, evaluate their numbers carefully — they aren't published in a verifiable format in our March 2026 review. RetainDB's <40ms retrieval is measured and published.
88% preference recall on LongMemEval. Under 40ms retrieval. Most teams are in production in under 30 minutes — no infrastructure to manage.
Pages that keep the comparison moving deeper into the RetainDB memory and context cluster.