Best In-Memory Databases in 2026
Updated
In short: VoltDB is ranked #1 of 25 as of 4 October 2026, ahead of Aerospike Database and Amazon ElastiCache. The best-ranked option with a free plan is Aerospike Database. The lowest first paid tier on this page is GridGain at $0.11/mo.
When applications depend on data held in memory, database options can be compared by their operating features as well as their data capabilities. Consider persistence, deployment, high availability, and included memory, then weigh SQL support, supported data models, and vector search against your workload. Free-plan availability and paid-from pricing add cost context. VoltDB, Aerospike Database, and Amazon ElastiCache are among the products shown. The relevant trade-offs will depend on the environment you run and the data access and availability requirements your application has.
25 in-memory databases ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
In-Memory Databases, ranked on how quickly a newcomer can get going. 12 of the 25 on this page can be tried for free.
- 1 VoltDBFree plan
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 2 Aerospike DatabaseFree plan
- Free to practise on: yes
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 3 Amazon ElastiCachePaid from $6/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 4 Apache GeodeFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 5 SingleStore HeliosPaid from $0.99/mo
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 6 eXtremeDB
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 7 GridGainPaid from $0.11/mo
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: yes
- 8 Redis InsightFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: yes
- 9 RonDBFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 10 VMware Workstation ProFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 11 InfinispanFree plan
- Free to practise on: yes
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 12 DragonflyPaid from $36/mo
- Free to practise on: not on record
- Free trial: yes
- Well documented: yes
- Runs where you work: not on record
- 13 KeyDB
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 14 SAP Customer Data Platform
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 15 Tarantool DB
- Free to practise on: not on record
- Free trial: not on record
- Well documented: yes
- Runs where you work: not on record
- 16 RaimaDB
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 17 Couchbase Server
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 18 DiceDB
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 19 ScaleOut In-Memory Database
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 20 ALTIBASE
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 21 Valkey
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 22 Erlang Debugger
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: yes
- 23 Amazon MemoryDB
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 24 VMware Tanzu Platform
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 25 Apache Ignite
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which in-memory database is ranked first on The Geeks Club?
VoltDB is ranked #1 of 25 with a score of 7.8. Aerospike Database is second and Amazon ElastiCache third.
How many of these have a free plan?
9 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, GridGain has the lowest first paid tier we found: $0.11/mo.
How is this list ranked?
Ranked on how quickly a newcomer can get going: documentation depth, a free tier or trial, and the platforms it runs on. Paid placements never change a rank.