In-Memory & Key-Value Databases

Hazelcast vs Momento

Compare Hazelcast and Momento side-by-side. See feature differences and pricing in the In-Memory & Key-Value Databases category.

Hazelcast

by Hazelcast

No reviews yet

Pricing: Community Edition is free and open source. Platform Enterprise is an annual subscription priced on request; Hazelcast Cloud is pay-as-you-go or pre-paid credits.

Hazelcast is an in-memory data platform and distributed key-value store for Java teams, with an open-source Community Edition and a managed cloud service.

10 /17 features Full profile

Momento

by Momento

No reviews yet

Pricing: Usage-based. Cache Flex from $13 per GB-month, Cluster from $0.0105 per instance-hour, Topics $1 per 1M operations; support plans $500 or $5,000 a month. Managed cache in preview.

Momento is enterprise Valkey for in-memory caching: a managed AWS service or a self-hosted Kubernetes stack, with pub/sub messaging and usage-based pricing.

9 /17 features Full profile

Feature Comparison

In-Memory & Key-Value Databases features side-by-side

Feature	Hazelcast 10/17 features	Momento 9/17 features
Rich data structures beyond strings Lists, hashes, sets, sorted sets and streams stored and manipulated server-side, not only opaque blobs.	Yes	Yes
Per-key expiration and eviction policies Keys expire on a TTL, and the store evicts by LRU, LFU or random selection when memory is full.	Yes	Yes
Snapshot persistence to disk Periodic point-in-time dumps of the in-memory dataset written to disk for restart recovery.	No	No
Append-only log persistence Every write is appended to a durable log so a restart loses at most a second or so of data.	Yes	No
Replica failover with automatic promotion Replicas stream from the primary and a sentinel or cluster manager promotes one when the primary dies.	Yes	Yes
Horizontal clustering of the keyspace The keyspace is sharded across nodes with client redirection, growing capacity beyond one host.	Yes	Yes
Active-active geo replication Writes accepted in several regions and merged with conflict-free replicated data types.	No	No
Pub/sub messaging channels Clients publish to and subscribe on channels for lightweight fan-out messaging.	Yes	Yes
Atomic server-side scripting Scripts or functions run atomically on the server against several keys in one call.	No	No
SSD tiering beyond available RAM Less-used values spill to SSD so the dataset can exceed memory at a lower cost per gigabyte.	No	Yes
Secondary indexes on stored values Hashes or JSON values indexed on their fields and queried with filters, not only fetched by key.	Yes	Yes
Native JSON value type JSON stored as a native type with path-level reads and updates on the server.	No	Yes
Multi-threaded request handling The server executes commands on several cores in parallel rather than on one event loop.	Yes	No
Per-user command and key ACLs Named users restricted to specific commands and key patterns, with TLS on client connections.	Yes	Yes
Client-side caching invalidation The server tracks keys a client has cached locally and pushes an invalidation when they change.	Yes	No
Streams with consumer groups An append-only log type with consumer groups for at-least-once processing by several workers.	No	No
Keyspace memory reporting Commands or dashboards report memory per key, the largest keys and fragmentation.	No	No
Overall Rating	No reviews yet	No reviews yet

Hazelcast 10/17 features

Rich data structures beyond strings: Yes
Per-key expiration and eviction policies: Yes
Snapshot persistence to disk: No
Append-only log persistence: Yes
Replica failover with automatic promotion: Yes
Horizontal clustering of the keyspace: Yes
Active-active geo replication: No
Pub/sub messaging channels: Yes
Atomic server-side scripting: No
SSD tiering beyond available RAM: No
Secondary indexes on stored values: Yes
Native JSON value type: No
Multi-threaded request handling: Yes
Per-user command and key ACLs: Yes
Client-side caching invalidation: Yes
Streams with consumer groups: No
Keyspace memory reporting: No

No reviews yet

Momento 9/17 features

Rich data structures beyond strings: Yes
Per-key expiration and eviction policies: Yes
Snapshot persistence to disk: No
Append-only log persistence: No
Replica failover with automatic promotion: Yes
Horizontal clustering of the keyspace: Yes
Active-active geo replication: No
Pub/sub messaging channels: Yes
Atomic server-side scripting: No
SSD tiering beyond available RAM: Yes
Secondary indexes on stored values: Yes
Native JSON value type: Yes
Multi-threaded request handling: No
Per-user command and key ACLs: Yes
Client-side caching invalidation: No
Streams with consumer groups: No
Keyspace memory reporting: No

No reviews yet

Pricing

Hazelcast

Community Edition is free and open source. Platform Enterprise is an annual subscription priced on request; Hazelcast Cloud is pay-as-you-go or pre-paid credits.

See all plans

Momento

Usage-based. Cache Flex from $13 per GB-month, Cluster from $0.0105 per instance-hour, Topics $1 per 1M operations; support plans $500 or $5,000 a month. Managed cache in preview.

See all plans

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