Best In-Memory Databases in 2026
Updated
In short: Infinispan is ranked #1 of 22 as of 3 October 2026, ahead of Aerospike Database and RonDB. 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.
If your workload depends on fast access to data, compare in-memory databases by how they balance persistence, deployment, and high availability. Included memory, SQL support, supported data models, and vector search help clarify what each option covers, while free-plan availability and paid-from pricing add cost context. The ranking begins with Infinispan, Aerospike Database, and RonDB, followed by VoltDB and SingleStore Helios. Check which data capabilities your application needs and how each system’s deployment and persistence options fit the way your team operates.
22 in-memory databases ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
| # | Platform | Score | Why | From | Free plan | Paid from | Deployment | |
|---|---|---|---|---|---|---|---|---|
| 1 |  Infinispan | 8.7 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 2 | Aerospike Database | 8.7 | RecognisedAPIDocumented | Free | Yes | — | — | View |
| 3 | RonDB | 8.3 | RecognisedAPIDocumented | Free | — | — | both | View |
| 4 |  VoltDB | 8.2 | RecognisedAPIDocumented | Free | No | — | both | View |
| 5 |  SingleStore Helios | 8.0 | RecognisedAPIDocumented | $0.99/mo | Yes | — | — | View |
| 6 | eXtremeDB | 7.8 | RecognisedAPIDocumented | — | — | — | both | View |
| 7 | Amazon ElastiCache | 7.3 | RecognisedAPIDocumented | $6/mo | No | 6 /mo | — | View |
| 8 |  GridGain | 7.2 | RecognisedAPIDocumented | $0.11/mo | No | — | both | View |
| 9 |  Dragonfly | 7.0 | RecognisedAPIDocumented | $36/mo | No | 36 /mo | both | View |
| 10 | Apache Geode | 6.5 | RecognisedAPIDocumented | Free | Yes | — | self-hosted | View |
| 11 |  KeyDB | 6.2 | RecognisedAPIDocumented | — | Yes | — | self-hosted | View |
| 12 | Apache Ignite | 6.1 | RecognisedAPIDocumented | — | — | — | — | View |
| 13 | Valkey | 6.1 | RecognisedAPIDocumented | — | — | — | — | View |
| 14 | Tarantool DB | 5.8 | RecognisedAPIDocumented | — | — | — | — | View |
| 15 | SAP HANA Cloud | 5.7 | RecognisedAPIDocumented | — | — | — | — | View |
| 16 | Redis Insight | 5.6 | RecognisedAPIDocumented | Free | Yes | — | both | View |
| 17 |  ALTIBASE | 5.5 | RecognisedAPIDocumented | — | No | — | — | View |
| 18 | Amazon MemoryDB | 5.4 | RecognisedAPIDocumented | — | No | — | — | View |
| 19 | DiceDB | 5.3 | RecognisedAPIDocumented | — | Yes | — | self-hosted | View |
| 20 | RaimaDB | 5.2 | RecognisedAPIDocumented | — | No | — | — | View |
| 21 |  ScaleOut In-Memory Database | 5.0 | RecognisedAPIDocumented | — | No | — | self-hosted | View |
| 22 | Erlang Debugger | 4.3 | RecognisedAPIDocumented | — | — | — | — | View |
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 Inferse?
Infinispan is ranked #1 of 22 with a score of 8.7. Aerospike Database is second and RonDB third.
How many of these have a free plan?
8 of the 22 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 what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.