FREEDOM251

Freedom251 › Developer Tools

Free and open first

Best In-Memory Databases in 2026

When an application needs data available in memory, compare database options by how they handle persistence, deployment, high availability, and included memory. SQL support, supported data models, and vector search can help distinguish their data capabilities. Check free-plan availability and paid-from pricing alongside those requirements. Amazon ElastiCache, Redis Insight, and Aerospike Database are among the named options to consider, as are VoltDB and Apache Geode. The listed criteria give you a way to weigh operational needs and data features together when choosing software for your workload.

  1. 1

    Aerospike Database

    by Aerospike Database
    Free plan Open source APILinuxMac+3

    Aerospike Database offers multiple data models, storage choices, and replication modes in one engine. Check edition support and licensing notes for connectors and security features when assessing fit.

    9.3 Free plan Visit site
  2. 2

    Apache Geode

    Free plan Open source APILinuxMac+2

    Apache Geode combines distributed data management, transactions, queries, and WAN replication in a free package.

    9.2 Free plan Visit site
  3. 3

    Apache Ignite

    Free plan Open source APILinuxMac+2

    Choose Apache Ignite if you need a free, open-source distributed database with SQL, partition-spanning transactions, and an in-memory primary tier.

    9.1 Open source Visit site
  4. 4

    VoltDB

    Free plan Open source APILinuxMac+2

    VoltDB combines an in-memory database with streaming integrations and multiple deployment options.

    8.5 Pricing on request Visit site
  5. 5

    Amazon ElastiCache

    Free plan APILinuxMac+2

    ElastiCache offers serverless and node-based deployment choices alongside multiple caching engines and AWS integrations.

    7.6 From $6/mo Visit site
  6. 6

    ALTIBASE

    by ALTIBASE
    Free plan LinuxSelf-hosted

    ALTIBASE offers several storage modes, replication architectures, and interfaces for Linux deployments.

    7.4 Pricing on request · 90-day trial Visit site
  7. 7

    DiceDB

    Free plan LinuxMacSelf-hosted

    DiceDB pairs Redis compatibility with subscriptions and a storage-tiering module.

    7.3 Free plan Visit site
  8. 8

    Infinispan

    Free plan APILinuxSelf-hosted

    Infinispan combines distributed in-memory storage with search, caching, and transaction features, and can be deployed in several forms.

    7.2 Free plan Visit site
  9. 9

    Redis Insight

    Free plan LinuxMacSelf-hosted+2

    Redis Insight brings Redis data browsing, command work, and analysis into a free GUI and CLI tool. Check the Docker-only API availability and SSPLv1 licensing if those affect your deployment.

    7.2 Free plan Visit site
  10. 10

    RonDB

    Free plan APILinuxSelf-hosted

    RonDB combines distributed storage, SQL access, and multiple deployment and replication options for real-time workloads.

    7.0 Open source Visit site
  11. 11

    SAP HANA Cloud

    by SAP HANA Cloud
    Free plan APILinuxWeb

    SAP HANA Cloud brings broad data-model support and AI capabilities into one database service.

    7.0 Free plan · pricing on request Visit site
  12. 12

    SingleStore Helios

    by SingleStore Helios
    Free plan APILinuxMac+3

    Helios brings varied data capabilities and ingestion options to a managed cloud database, with separate Shared, Standard, and Enterprise plans.

    7.0 Free plan · paid from $0.99 Visit site
  13. 13

    Valkey

    by Valkey
    Free plan APILinuxMac+1

    Valkey offers a broad set of data types and deployment options for caching, queues, and primary database workloads.

    7.0 Open source Visit site
  14. 14

    KeyDB

    Free plan LinuxMacSelf-hosted

    KeyDB offers Redis compatibility, multiple data structures, and scaling and persistence options without a listed price.

    6.8 Free plan Visit site
  15. 15

    eXtremeDB

    Free trial AndroidAPIiPhone+4

    Consider eXtremeDB if you are building embedded software or need a database system with both in-memory and persistent storage, varied interfaces, and distributed options.

    6.3 Pricing on request · 60-day trial Visit site
  16. 16

    Couchbase Server

    Free plan

    Couchbase Server offers a free edition and a subscription edition with additional stated support and security provisions.

    6.2 Free plan Visit site
  17. 17

    Dragonfly

    Free trial APILinuxSelf-hosted

    Dragonfly provides an API-compatible in-memory store with automatic sharding, multiple data models, and deployment choices from Docker to managed cloud.

    6.2 From $36/mo Visit site
  18. 18

    GridGain

    Free trial APILinuxMac+2

    GridGain combines in-memory processing with transactions, analytics, and configurable disk persistence. Check edition requirements for security and recovery features, and request a quote for pricing.

    6.2 Pricing on request · 30-day trial Visit site
  19. 19

    RaimaDB

    Free trial AndroidAPIiPhone+5

    Choose RaimaDB when an embedded, resource-conscious database for mission-critical or safety-critical systems fits your application.

    6.1 Pricing on request Visit site
  20. 20

    SAP Master Data Governance

    Free plan Web
    6.1 Free plan · pricing on request Visit site
  21. 21

    ScaleOut In-Memory Database

    Free trial APILinuxSelf-hosted+1

    ScaleOut In-Memory Database is a self-hosted Redis-oriented cluster with automated shard and replica management. Its fit depends on accepting the documented feature exclusions and requesting pricing.

    6.0 Pricing on request · 30-day trial Visit site
  22. 22

    Amazon MemoryDB

    Paid APIWeb

    Amazon MemoryDB combines in-memory performance with durability, scaling options, and Valkey and Redis OSS compatibility.

    5.7 Visit site
  23. 23

    Erlang Debugger

    Paid LinuxMacWindows

    Choose Erlang Debugger when you need a graphical way to test Erlang programs, inspect processes, or control execution with breakpoints.

    5.4 Open source Visit site
  24. 24

    Tarantool DB

    Paid APILinuxMac+1

    Choose Tarantool DB for self-hosted business systems that need in-memory data, real-time processing, replication, or Redis compatibility.

    5.1 Pricing on request Visit site
  25. 25

    VMware Tanzu Platform

    Paid APISelf-hostedWeb

    Choose VMware Tanzu Platform if application or platform teams need a self-hosted application platform with shared governance, built-in delivery workflows, and Spring support.

    4.9 Pricing on request Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

More in Developer Tools