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.
In-memory databases are designed for applications that work with data held in memory, and their operational and data capabilities vary. Compare persistence, deployment, high availability, and included memory, then consider SQL support, supported data models, and vector search. Free-plan availability and paid-from pricing provide further comparison points. VoltDB, Aerospike Database, and Amazon ElastiCache are among the products to assess. Consider the workload and environment you have in mind, and use the listed features to compare how each option handles data and deployment needs.
25 in-memory databases ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Is your tool 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 Specifiction?
VoltDB is ranked #1 of 25 with a score of 7.6. 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 what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing. Paid placements never change a rank.