UnisonDB – Log-native KV database that replicates like a message bus

In plain words

UnisonDB is a log-native key-value database that combines storage and streaming into a single system. Built around a write-ahead log that serves as the database itself rather than just a recovery mechanism, it eliminates the need for separate CDC and message queue tools. The system offers durable, globally ordered writes that replicate to followers in real time, using B+Tree storage for predictable reads without compaction overhead. It's designed for teams needing to move data across edge, core, and datacenter environments without managing multiple infrastructure components.

written from the facts on this page · September 2026

From the sources

Reactive, log-native database for AI agents and edge computing — delivering real-time replication over gRPC or object-store backed replication, local-first sync, and multimodal data storage.

UnisonDB is an open-source database designed specifically for Edge AI and Edge Computing . It is a reactive , log-native and multi-model database built for real-time and edge-scale applications. UnisonDB combines a B+Tree storage engine with WAL-based ( Write-Ahead Logging ) replication over gRPC or object-store backed replication , enabling fan-out replication across many readers while preserving strong consistency and durability. Writes are committed by a Raft quorum on the write servers (if enabled); read-only edge replicas and relayers can consume WAL through either a live gRPC stream or object-store backed replication . See cmd/examples/blobstore-minio for a local MinIO example using…from unisondb.io

In the maker’s words, at launch

Hi HN, For the past few months, I’ve been building UnisonDB — a log-native database where the Write-Ahead Log (WAL) is the database, not just a recovery mechanism. I started this because every time I needed data to flow — from core to edge, or between datacenters — I ended up gluing together a KV database + CDC +…

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  UnisonDB – B+Tree DB with sub-second replication to 100+ nodesNov 2025 · github.com · ▲15

  Hi everyone — I’m the developer of UnisonDB, an open-source log-native database built in Go for distributed and edge-scale systems. UnisonDB rethinks the boundary between databases and streaming systems. Instead of treating the Write-Ahead Log (WAL) as a recovery mechanism, it treats the log itself as the database. Every write is immediately durable, queryable, and replicable — without Kafka, CDC pipelines, or changefeed daemons. UnisonDB unifies persistence and streaming in one system. It’s designed for real-time, event-driven, and edge-first workloads where data needs to move as fast as…

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