In-Memory Databases
Alternatives to VoltDB
VoltDB is a distributed, in-memory database for real-time decisioning. It combines streaming ingest, business logic and AI integration, partitions data and stored procedures for parallel queries with ACID consistency, and targets ingest-to-action latency under 10 milliseconds. Kafka and CDC connections can feed decisions exposed through SQL, REST or Kafka topics. Clusters scale by adding nodes, with on-premises, Kubernetes, VM and hybrid deployment options. Enterprise Edition adds command logging, replicated partitions and wide-area replication.
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Amazon ElastiCache It suits teams that need managed caching compatible with Valkey, Memcached, or Redis OSS, whether as a serverless cache or node-based cluster.
From $0.09/mo Free plan Web · Windows · macOS · Linux9.4 Visit Specs - 02
Aerospike Database Free plan Open source Web · Windows · macOS · Linux9.1 Visit Specs - 03
Apache Geode Geode is aimed at teams building high-scale business applications that need low latency and high availability.
Free plan Open source Windows · macOS · Linux · API8.9 Visit Specs - 04
Apache Ignite It suits teams needing a self-hosted distributed SQL database for streaming, microservices state, sessions or feature stores.
Free plan Open source Windows · macOS · Linux · API8.9 Visit Specs - 05 SingleStore Helios
Helios may suit teams running transactional and analytical workloads together or working with varied data types.
From $0.99/mo Free plan Web · Windows · macOS · Linux8.8 Visit Specs - 06 ALTIBASE
A+ Edition is intended for startups, developers, and students using the database for development, testing, or education.
Free plan Linux · Self-hosted8.2 Visit Specs - 07 GridGain
GridGain suits organisations needing scalable transactional, streaming, or analytical processing, including financial services, software, retail, telecommunications, online services, and healthcare.
From $0.11/mo Free trial Windows · macOS · Linux · API8.2 Visit Specs - 08 Dragonfly From $36/mo Free trial Linux · API · Self-hosted8.1 Visit Specs
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Redis Insight Redis Insight suits developers who need GUI and CLI tools for working with Redis data across supported deployments.
Free plan Web · Windows · macOS · Linux7.9 Visit Specs - 10
eXtremeDB eXtremeDB is for developers working with embedded devices and applications who need in-memory, persistent, or hybrid storage.
Free trial Windows · macOS · Linux · iOS7.8 Visit Specs - 11
RaimaDB RaimaDB is aimed at teams building embedded, edge, IoT, or real-time applications.
Free trial Web · Windows · macOS · Linux7.8 Visit Specs - 12
DiceDB Free plan macOS · Linux · Self-hosted7.7 Visit Specs - 13 Infinispan
It suits developers building self-hosted or embedded applications that need distributed caching and search.
Free plan Linux · API · Self-hosted7.6 Visit Specs - 14
RonDB RonDB suits teams building real-time applications that need distributed storage, SQL access, or a feature-store database.
Free plan Linux · API · Self-hosted7.6 Visit Specs - 15
SAP HANA Cloud Free plan Web · Linux · API7.6 Visit Specs - 16 ScaleOut In-Memory Database Free trial Windows · Linux · API · Self-hosted7.5 Visit Specs
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Erlang Debugger It is for Erlang developers who need graphical process inspection, breakpoints, or remote-node debugging.
Windows · macOS · Linux7.4 Visit Specs - 18 KeyDB macOS · Linux · Self-hosted7.4 Visit Specs
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Valkey Valkey suits developers and operators building caches, queues or database-backed applications that need clustering, replication or persistence.
Free plan macOS · Linux · API · Self-hosted7.4 Visit Specs - 20
Amazon MemoryDB Web · API7.3 Visit Specs - 21
Tarantool DB macOS · Linux · API · Self-hosted6.8 Visit Specs - 22 Couchbase Server 6.2 Visit Specs
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VMware Tanzu Platform Tanzu Platform is described for application and platform engineering teams needing shared governance and visibility.
Web · API · Self-hosted6.2 Visit Specs - 24 SAP Master Data Governance Web5.9 Visit Specs
Choosing instead of VoltDB
Readers may still prefer another product for a managed service, broader platform choices, a particular compatibility route, or a different transaction-and-analytics mix. VoltDB has a free Developer Edition, but it is not intended for production; other offerings include a 30-day stream trial and paid engagements, with pricing on request. Production support centers on specified Linux distributions, while macOS is for development. Compare operational ownership, supported data models, SQL behavior, scaling, resilience, deployment targets, security configuration and migration requirements before switching.