Retrieval answers “what is similar to this?”. Long-running agents also need to answer who wrote a piece of state, whether it was verified, what it contradicted, and whether it can be undone. These pages describe other products only by their own published positioning.
Pick a vector DB when you only need semantic search over documents.
A vector database answers "what is similar to this?". Bilinc keeps the operational record around the write: who produced it, whether it was verified, what it contradicted, and how to undo it.
Read the comparisonLicensing and hosting model are the clearest separators.
Mem0 describes itself as a universal memory layer for AI agents. Bilinc is hosted agent-state infrastructure with verification, provenance, and recovery around every write.
Read the comparisonCompare on how each one handles state that turns out to be wrong.
Zep positions on a temporal knowledge graph for agent memory. Bilinc positions on the operational record: verified writes, contradiction handling, snapshots, and rollback.
Read the comparisonPick Letta when you want the framework itself, not just the memory plane.
Letta (formerly MemGPT) is an open-source agent framework with memory built in. Bilinc is the state layer your runtime calls; it does not orchestrate agents.
Read the comparisonComparison pages use each product’s published self-description plus verifiable license and repository facts. Bilinc does not assert capability gaps in other products. If something here is out of date, tell us and we will correct it.
The public bilincpackage is a cloud-only Python SDK, CLI, and MCP adapter licensed BUSL-1.1 — source-available, not open source. If you need a fully self-hosted runtime, that is the honest reason to pick something else.
