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RonDB

Free#8 of 24 in In-Memory DatabasesKey-Value Databases

RonDB: A Kubernetes-ready distributed SQL database for scalable, highly available workloads. Ranked #8 of 24 in In-Memory Databases by our editors (8.4/10); pricing: Open source; best for open-source distributed SQL with Kubernetes deployment.

8.4/10Editor score

Visit RonDB

RonDB8.4 Visit RonDB

At a glance

Editor score
8.4 / 10
Pricing
Open source
Best for
Open-source distributed SQL with Kubernetes deployment
Paid from
Free
Deployment
Both
Facts checked
20 Sep 2026

Where it wins
- MySQL-compatible SQL with key-value access
- Synchronous and cross-region replication support
- Kubernetes and Helm deployment with online scaling
Where it doesn't
- Verified integrations are limited
- Distributed deployment requires operational expertise
- No standard paid plan is described

Our verdict on RonDB

RonDB is an open-source distributed database for teams building scalable transactional systems, online feature stores, telecom services, financial applications, networking services, gaming platforms, and other high-throughput workloads. Its distributed shared-nothing architecture combines key-value access with a MySQL-compatible SQL interface, while supporting both in-memory and on-disk columns. RonDB can run on Linux, through an API, or in self-hosted environments, with deployment options that include local use, Docker, Kubernetes, on-premises environments, and managed cloud environments.

Deployment and availability are central to RonDB’s design. Kubernetes and Helm support give platform teams a defined path for containerized deployment, while online horizontal and vertical scaling support capacity changes without a stated migration workflow. Synchronous replication across availability zones and cross-region asynchronous replication address different availability and geographic distribution needs. Automatic recovery and checkpoint-based persistence add durability mechanisms, and the REST API supports key lookups and batched lookups. These capabilities make RonDB a fit for teams that need distributed operations alongside SQL access rather than a narrowly focused in-memory cache.

RonDB also has a focused ecosystem rather than a broad integration catalog. Listed integrations include Hopsworks, HopsFS, and Hudi, and the product includes AI features, but the published integration set is limited. The combination of SQL, key-value access, replication, scaling, persistence, and Kubernetes deployment suits engineering teams that can operate a distributed database and want open-source control. Teams seeking a simpler hosted database experience, a wider ready-made integration ecosystem, or a narrowly scoped caching layer should consider alternatives instead.

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RonDB pricing

Plans Open sourceFree Free to use — no paid tier required for the core job.

See plans on rondb.com

RonDB fact sheet

Free plan	Not verified
Paid from	Free
Deployment	Both
Data persistence	Yes
High availability	Yes
SQL support	Yes
Vector search	Not verified
Included memory	Not verified
Supported data models	key-value, relational, in-memory, on-disk columns
Deployment	Cloud, Self-hosted
Platforms	Linux
Support	Docs
Built for	Mid-market, Enterprise (editorial estimate)
Integrations	3 integrations: Hopsworks, HopsFS, Hudi
Pricing	Open source
Website	rondb.com
Facts checked	20 Sep 2026

RonDB integrations

RonDB lists 3 integrations on its own site.

Hopsworks
HopsFS
Hudi

Alternatives to RonDB

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RonDB vs the competition

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Also Ranked In

RonDB is ranked in 2 of our directories.

#29Key-Value Databases31 tools ranked

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Featured on iTechGuides

RonDB is listed in our In-Memory Databases directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update