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VoltDB

voltactivedata.com

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Spec score 8.2 #8 of 25 in In-Memory Databases

What it is

VoltDB is a distributed, in-memory database and real-time decisioning layer for data processing, stream ingestion, business logic, and AI integration. Its database partitions data and stored procedures so queries can run in parallel while maintaining ACID consistency. Volt Active Data says Volt is built to move from ingest to action in under 10 milliseconds. Clusters scale by adding nodes, with partitioning automated from the schema. Volt connects directly to Kafka or CDC streams and can expose decisions through SQL, REST, or Kafka topics. It supports on-premises, cloud Kubernetes or VM-based, and hybrid deployments. Production databases support Debian 12.11 or later, RHEL 8.8 or later, Rocky Linux 8.8 or later, and Ubuntu 20.04, 22.04, or 24.04; macOS 13 or later is supported for development. Enterprise Edition provides command logging, locally replicated partitions, and wide-area database replication. Authentication, role-based authorization, and TLS/SSL or Kerberos communications are available, but security is disabled by default. The free Developer Edition is not intended for production workloads. A free 30-day trial is listed for Confluent users; production pricing is on request.

Spec sheet

What it does
VoltDB is an in-memory, distributed relational database and real-time decisioning platform for high-throughput, low-latency transactional workloads.Read 19 Oct 2026 · docs.voltactivedata.com
Deployment
Volt supports on-premises, cloud Kubernetes or VM-based deployments, and hybrid deployments.Read 30 Sep 2026 · voltactivedata.com
Integrations
Documented integrations include Kafka, Kinesis, HDFS, JDBC/ODBC, Elasticsearch and RabbitMQ through import and export capabilities.Read 19 Oct 2026 · voltactivedata.com
Support
Production support operates 8:00 am–6:00 pm Eastern Time, with 24×7 telephone coverage for severity-one production incidents.Read 19 Oct 2026 · voltactivedata.com
License
The Community Edition is released under the GNU Affero General Public License version 3, while client libraries are separately licensed under MIT.Read 19 Oct 2026 · github.com
Headquarters
Burlington, Massachusetts, United StatesRead 28 Sep 2026 · voltactivedata.com
Founded
2009Read 28 Sep 2026 · voltactivedata.com
ACID transactions
The database provides ACID-compliant transactions using ANSI SQL and stored procedures.Read 19 Oct 2026 · docs.voltactivedata.com
Automatic partitioning
Data and stored procedures can be partitioned across cluster nodes so queries execute in parallel without manually managing shards.Read 19 Oct 2026 · metrics.voltactivedata.com
Commercial licensing
Enterprise subscription fees are annual and include standard support and maintenance under the sales order.Read 19 Oct 2026 · voltactivedata.com
Company headquarters
LinkedIn lists headquarters in Burlington, Massachusetts, with company size of 11–50 employees.Read 19 Oct 2026 · linkedin.com
Company identity
Volt Active Data was previously VoltDB and is a privately held software company founded in 2009.Read 19 Oct 2026 · linkedin.com
Cross-data-center replication
VoltDB supports active-active cross-data-center replication for geographically distributed deployments.Read 19 Oct 2026 · voltactivedata.com
Current release
VoltDB release notes list version 15.3.1 dated September 15, 2026.Read 30 Sep 2026 · university.voltactivedata.com
Database model
VoltDB is a distributed, in-memory database that partitions data and stored procedures so queries can run in parallel while retaining ACID consistency.Read 30 Sep 2026 · docs.voltactivedata.com
Developer documentation
Official documentation covers tutorials, application development, performance, administration, Kubernetes, upgrades, security and SQL/CLI reference material.Read 19 Oct 2026 · docs.voltactivedata.com
Developer limitation
The Developer Edition is free to use but is not intended for production workloads.Read 30 Sep 2026 · voltactivedata.com
Durability
VoltDB Enterprise Edition provides command logging, locally replicated partitions (K-safety) and wide-area database replication for durability and high availability.Read 30 Sep 2026 · docs.voltactivedata.com
Funding
VoltDB announced a $10 million Series C funding round on October 23, 2019.Read 19 Oct 2026 · prnewswire.com
High availability
Enterprise VoltDB provides K-safety, command logging and replication features for durability and availability.Read 19 Oct 2026 · metrics.voltactivedata.com
In-memory architecture
VoltDB keeps operational data in memory and serializes access within partitions to reduce locking and disk overhead.Read 19 Oct 2026 · docs.voltactivedata.com
Kubernetes
The documentation includes a Kubernetes Operator and Helm-based deployment guide.Read 19 Oct 2026 · docs.voltactivedata.com
Latency
The company says Volt is built to move from ingest to action in under 10 milliseconds.Read 30 Sep 2026 · voltactivedata.com
Legal name
Crunchbase lists the legal name as VoltDB, Inc. and the operating status as active.Read 19 Oct 2026 · crunchbase.com
Limit: G2 platform
A G2 reviewer reports that VoltDB was unavailable on Microsoft Windows and had extra learning overhead for non-Linux users.Read 19 Oct 2026 · g2.com
Limit: G2 price
A G2 reviewer says VoltDB was expensive compared with contemporary database technologies.Read 19 Oct 2026 · g2.com
Limit: G2 query scope
A G2 reviewer says VoltDB is not optimized for fetching and collating large datasets across multiple tables.Read 19 Oct 2026 · g2.com
Operating systems
Production VoltDB databases support Debian 12.11 or later, RHEL 8.8 or later, Rocky Linux 8.8 or later and Ubuntu 20.04, 22.04 or 24.04; macOS 13 or later is supported for development.Read 30 Sep 2026 · docs.voltactivedata.com
Praise: G2 performance
G2 reviewers praise in-memory analytics, real-time transaction performance, ACID consistency, failover and replication.Read 19 Oct 2026 · g2.com
Praise: Gartner performance
Gartner reviewers highlight real-time speed, consistency, accuracy, personalized engagement, JSON support and ease of use.Read 19 Oct 2026 · gartner.com
Product role
Volt Active Data describes Volt as a real-time decisioning layer combining in-memory data processing, streaming ingest, business logic and AI integration.Read 30 Sep 2026 · voltactivedata.com
Public APIs
VoltDB exposes Java client APIs, server APIs, stored procedures, a JSON HTTP interface and a client wire protocol.Read 19 Oct 2026 · docs.voltactivedata.com
Python SDK
The current Python client is topology-aware, supports asynchronous calls and is installable from PyPI as voltdbclient for Python 3.9 or later.Read 19 Oct 2026 · docs.voltactivedata.com
Rating on G2
4.3 out of 5 from 6 reviewsRead 19 Oct 2026 · g2.com
Rating on Gartner Peer Insights
4.9 out of 5 from 9 ratingsRead 19 Oct 2026 · gartner.com
Rating on SoftwareReviews
Insufficient data; 2 reviewsRead 19 Oct 2026 · softwarereviews.com
Rating on TrustRadius
9 out of 10 from 1 reviewRead 19 Oct 2026 · trustradius.com
Release 16.0
The September 30, 2026 release added a topology-aware asynchronous Python client, native MASK functions and fixes for CVE-2026-10051.Read 19 Oct 2026 · docs.voltactivedata.com
Release limitation
VoltDB 16 removed built-in Topics declarations and recommends import/export or VoltSP pipelines instead.Read 19 Oct 2026 · docs.voltactivedata.com
Scaling
VoltDB can scale by adding nodes to a cluster, with partitioning automated from the schema.Read 30 Sep 2026 · docs.voltactivedata.com
SDK languages
Client interfaces are documented for C#, C++, Erlang, Go, Java, JDBC, JSON, Node.js, PHP and Python.Read 19 Oct 2026 · docs.voltactivedata.com
Security controls
Authentication and authorization are enabled through configuration, with users, roles and stored-procedure permissions.Read 19 Oct 2026 · community.voltactivedata.com
Security default
Security checks are disabled by default until the operator enables them in the deployment configuration.Read 19 Oct 2026 · community.voltactivedata.com
Self-hosting
VoltDB is distributed as installable tar archives and can be built from source on 64-bit Linux or macOS development systems.Read 19 Oct 2026 · docs.voltdb.com
Streaming decisions
Volt places authoritative state and atomic decision enforcement between streaming inputs and application actions.Read 19 Oct 2026 · voltactivedata.com
Streaming integrations
Volt connects directly to Kafka or CDC streams and can expose decisions through SQL, REST or Kafka topics.Read 30 Sep 2026 · voltactivedata.com
System requirements
The documented baseline includes a 64-bit Linux-based OS, dual-core x86_64 CPU, 4 GB RAM and synchronized system time.Read 19 Oct 2026 · university.voltdb.com
Target users
Volt says it works with companies building or modernizing mission-critical applications, including financial services, telecommunications and enterprise technology.Read 30 Sep 2026 · voltactivedata.com
Transport security
TLS/SSL or Kerberos can secure client, administrative, HTTP and inter-cluster communications.Read 19 Oct 2026 · community.voltactivedata.com

Plans and prices

Developer Edition Free Free local or cloud deployment · sample apps, tutorials and documentation · not for production Read 19 Oct 2026 · voltactivedata.com
Stream to Decision Trial Free Consumption-based pricing begins when live Kafka integration · Docker templates · evaluate latency, performance and logic on your data Read 19 Oct 2026 · voltactivedata.com
Guided Engagement Priced on request defined use cases and production timelines · 12-week paid engagement · production deployment · customer success manager Read 30 Sep 2026 · voltactivedata.com
Guided Engagement Priced on request Custom engagement full-featured deployment · solution-engineer collaboration · dedicated Slack support · SLA-backed guidance Read 19 Oct 2026 · voltactivedata.com

Every VoltDB plan and price →

Strong points and limits

Strong points

  • Maintains ACID consistency while queries run in parallel.
  • Clusters scale by adding nodes.
  • Connects to Kafka or CDC streams.
  • Supports on-premises, cloud, and hybrid deployments.
  • Free 30-day trial listed for Confluent users.

Limits

  • Developer Edition is not intended for production workloads.
  • Security is disabled by default.
  • Production pricing is on request.
  • macOS is supported for development, not production databases.

Who it suits

VoltDB suits companies building or modernizing mission-critical applications, including in financial services, telecommunications, and enterprise technology. The free Developer Edition is for individual developers and early exploration, not production workloads.

VoltDB in depth

Read the full write-up

Overview

VoltDB is a distributed, in-memory database for applications that need to turn streams of events into decisions quickly. It is best suited to teams building mission-critical services in areas such as finance and telecommunications. Its mix of parallel processing, transactional consistency and deployment flexibility is compelling, but production use is a paid proposition and security needs deliberate configuration.

Key features

VoltDB partitions data and stored procedures so queries can run in parallel while retaining ACID consistency. Teams can add cluster nodes to scale horizontally, with partitioning automated from the schema. That combination is useful when an event-driven workload needs throughput and transactional guarantees; it is a more specialized choice than a database selected for broad, general-purpose use.

Volt connects directly to Kafka or CDC streams and can expose decisions through SQL, REST or Kafka topics. Volt Active Data says the system is built to move from ingest to action in under 10 milliseconds, making it relevant where response time is central to the application. That stated target does not establish performance for every workload.

Enterprise Edition adds command logging, locally replicated partitions through K-safety, and wide-area database replication. Those durability and availability capabilities matter for production deployments, but they are not part of the free Developer Edition. Volt supports persistent data, high availability and multi-region deployment.

Deployment options span on-premises, cloud Kubernetes, VM-based and hybrid environments. User authentication and role-based authorization are supported, as are TLS/SSL and Kerberos communications. Security is disabled by default, so teams must account for enabling and configuring those controls rather than assuming a secure out-of-box setup.

Pricing

VoltDB is a paid product with custom pricing for production use. The free Developer Edition is aimed at individual developers and early exploration, whether local or in the cloud; it includes sample apps, tutorials and documentation and requires no infrastructure. It is not intended for production workloads, so it is a starting point for evaluation rather than a no-cost production tier.

The Stream to Decision Trial costs nothing for 30 days. It is aimed at Confluent users and includes a Kafka stream connection and pre-built Docker templates, making it the more focused option for trying stream integration. The 30-day term limits it to evaluation.

Guided Engagement has custom pricing and is a 12-week paid engagement for defined use cases and production timelines. It includes production deployment and a customer success manager, which suits organizations that want structured help moving a specific application into production. It is not a substitute for a permanently free production plan.

Platforms

VoltDB supports API access, Linux, macOS development, self-hosted deployments and web access. Production databases support Debian 12.11 or later, RHEL 8.8 or later, Rocky Linux 8.8 or later, and Ubuntu 20.04, 22.04 or 24.04; macOS 13 or later is supported for development. The distinction matters: macOS is a development platform, not a listed production operating system.

Who it's for

VoltDB is a strong fit for organizations modernizing or building mission-critical applications that need to process streaming data and act on it with low latency. Its financial services, telecommunications and enterprise technology focus aligns with teams that need transactional consistency alongside event-driven processing. It is a poorer fit for developers seeking a free production database, or teams whose workload does not benefit from a distributed, partitioned design.

Pros and cons

Pro: Parallel queries retain ACID consistency, pairing scale-out processing with transactional guarantees.

Pro: Direct Kafka and CDC connectivity, with SQL, REST and Kafka output options, supports an event-to-decision flow.

Pro: On-premises, Kubernetes, VM-based and hybrid deployment choices accommodate varied operating environments.

Con: Developer Edition is explicitly unsuitable for production, while production pricing is custom.

Con: Security controls are disabled by default, requiring teams to enable and configure protection.

Con: Production OS support is specific to listed Linux distributions and versions; macOS is for development.

Alternatives

For teams comparing database categories, see In-Memory Databases and Distributed SQL Databases.

Aerospike Database is worth considering if its freemium model and Community Edition limits of 8 nodes, 2.5 TB of data and 2 namespaces better match your requirements.

Amazon ElastiCache is a paid alternative with a free plan, for teams comparing a managed cache option; its free trial is not available.

eXtremeDB is another paid database option with a free trial and support for Android, iOS and Windows as well as Linux and macOS.

GridGain is a paid alternative with a free trial; its listed Nebula cluster monitoring plan is $0.11 a month per monitored server node.

Redis Insight is a free option for teams seeking a database tool available across Linux, macOS, self-hosted, web and Windows platforms.

Apache Geode is a free alternative available as binary and source distributions under the Apache License.

SingleStore Helios offers a free Shared workspace for evaluation, development and non-production testing; choose it when that free workspace model fits better.

VMware Workstation Pro is a free option for users looking for virtualization software for Windows or Linux hosts.

Verdict

Choose VoltDB when a mission-critical application needs fast stream processing, parallel database work and ACID consistency across flexible deployment environments. Its production-oriented durability options strengthen the case for serious event-driven systems, but custom pricing, a non-production free edition and security disabled by default are reasons to look elsewhere if you need a free production database or a turnkey setup.

Verdict

VoltDB combines parallel database processing, stream connections, and multiple deployment options. The free Developer Edition is not for production, and production pricing is available on request.

Where Specifiction places it

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