RonDB

RonDB is ranked #12 of 29 in key-value databases on Freedom251. It runs on API, Linux, Self-hosted. There is a free plan.

RonDB plans and pricing

All plans

Serverless RonDB via Hopsworks Free quotas on Feature Groups (tables) · quotas on memory usage docs.rondb.com · 1 Oct 2026

Compared on key-value databases

Deployment: both
Data persistence: Yes
High availability: Yes
SQL support: Yes
Supported data models: key-value, relational, in-memory, on-disk columns

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RonDB

What it does: RonDB is a distributed, shared-nothing storage engine and an open-source fork of MySQL NDB Cluster for real-time applications.
Storage scale: RonDB supports up to 1 PiB of storage.
Scaling: RonDB supports online horizontal and vertical scaling for storage and MySQL-server compute.
Transactions: RonDB is ACID compliant through MySQL-server support, with in-memory data persisted using REDO logs and checkpoints.
Performance model: RonDB targets low latency, high availability, high throughput and scalable storage, which it calls LATS.
SQL access: Applications can access RonDB through the MySQL Server API with SQL compatibility and parallel query support.
AI integrations: RonDB supports AI application storage integrated with Spark and Kafka.
Redis compatibility: Rondis implements a Redis server using RonDB storage and the Redis wire protocol.
REST security: The RonDB REST API supports Hopsworks API-key authentication and recommends TLS when API keys are used.
Encryption at rest: RonDB supports encryption of on-disk data including local checkpoints, tablespaces, REDO logs and UNDO logs, but not backups.
Deployment options: RonDB can be tested locally, run in Docker, managed in AWS, Azure or GCP using own cloud credentials, or deployed on-premises by inquiry.
Replication: RonDB supports synchronous cross-availability-zone active-active replication with 1 to 3 replicas and asynchronous cross-region replication across clusters with conflict resolution.
Primary use case: RonDB is used as the online feature-store database for low-latency, high-availability machine-learning applications in Hopsworks.
Transactional limit: RonDB uses read-committed isolation and does not support range locks.
Price from: Free

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Where it ranks on Freedom251

Best Key-Value Databases in 2026#12 of 29
Best In-Memory Databases in 2026#8 of 24

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Sources

docs.rondb.com· checked 1 Oct 2026
rondb.com· checked 1 Oct 2026
rondb.com/about· checked 1 Oct 2026
docs.rondb.com/rondis/· checked 1 Oct 2026
docs.rondb.com/rondb_rest_api/· checked 1 Oct 2026
docs.rondb.com/rondb_advanced_fs_config/· checked 1 Oct 2026
docs.rondb.com/rondb_use_cases/· checked 1 Oct 2026
docs.rondb.com/intro_transactions/· checked 1 Oct 2026
docs.rondb.com/release_notes_22107/· checked 1 Oct 2026