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Apache Ignite vs ScaleOut StateServer

Apache Ignite: A distributed, memory-first SQL database and compute grid; Ignite 3 rebuilt it around Raft and Calcite. ScaleOut StateServer: Commercial in-memory data grid for .NET and Java with parallel query, Redis support and in-cache code.

key differences

  • Licensing: Apache Ignite is open source (permissive) (Apache License 2.0); ScaleOut StateServer is proprietary (Proprietary).
  • Apache Ignite is built for larger datasets (≤ 1 PB) than ScaleOut StateServer (≤ 10 TB).
  • Transactions: Apache Ignite offers full ACID; ScaleOut StateServer offers limited.
  • Only Apache Ignite has transactions, joins, change data capture, stored procedures, durable persistence.
  • Only ScaleOut StateServer has pub/sub.
  • Apache Ignite can run embedded in your application process.

choose apache-ignite for

  • +Accelerating legacy RDBMS with an in-memory SQL cache layer
  • +Real-time risk and pricing calculations
  • +Distributed caching with SQL queries over cached data
  • +HTAP workloads on a sharded JVM cluster

best at · Cache, OLTP, HTAP

choose scaleout-stateserver for

  • +Distributed session state for ASP.NET and Java web farms
  • +Low-latency shared object cache for .NET services
  • +Real-time analytics and digital twins over fast-changing data
  • +Replacing self-managed Redis in Windows-centric shops

best at · Cache, Sessions, Real-time analytics

Apache IgniteA distributed, memory-first SQL database and compute grid; Ignite 3 rebuilt it around Raft and Calcite.
ScaleOut StateServerCommercial in-memory data grid for .NET and Java with parallel query, Redis support and in-cache code.
overview
Primary model
Key-Value
Key-Value
Also supports
Relational
Document
Type
Database engine
Database engine
Status
Active
Active
Developer
Apache Software Foundation
ScaleOut Software, Inc.
First release
2015
2005
Latest version
3.1.0 (Oct 29, 2025)
6 (Sep 2025)
License
Open source (permissive)Apache License 2.0
ProprietaryProprietary
Free tier
✓
—
popularity
WhichDB Score
28.3
0.0
Rank
#98
#806
GitHub stars
5.1K
–
Stack Overflow questions
3.1K
–
scale & guarantees
Comfortable data size
Large (≤ 1 PB)
Medium (≤ 10 TB)
Horizontal scaling
Native
Native
Multi-region
None
Read replicas
ACID
Full
Limited
Consistency
Strong
Strong
Schema
Strict
Schemaless
Architecture
In memory, Distributed, Embedded, Client server
Distributed, In memory
deployment
Self-hosted
✓
✓
Vendor-managed cloud
—
—
Serverless
—
—
Embedded
✓
—
Edge
—
—
Clouds
–
–
capabilities
Transactions
✓
—
Joins
✓
—
Secondary indexes
✓
✓
Full-text search
—
—
Vector search
—
—
Geospatial
—
—
JSON
—
—
Change data capture
✓
—
Triggers
—
—
Stored procedures
✓
—
Materialized views
—
—
TTL / expiry
✓
✓
Pub/Sub
—
✓
Columnar storage
—
—
In-memory
✓
✓
Durable persistence
✓
—
Compression
✓
—
Encryption at rest
✓
—
Role-based access
✓
—
Time travel
—
—
Branching
—
—
Online schema changes
✓
—
Streaming ingest
✓
—
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
SQL, Key-value API
LINQ, Java/C++ filter APIs, Redis commands
Client languages
Java, C#, C++, Python, JavaScript
C#, Java, C, C++
Best for
Cache, OLTP, HTAP, Real-time analytics
Cache, Sessions, Real-time analytics, Pub/Sub
Add more to this comparisonNot sure either fits? Try smart match

Apache Ignite vs ScaleOut StateServer: FAQ

What is the difference between Apache Ignite and ScaleOut StateServer?

Apache Ignite: A distributed, memory-first SQL database and compute grid; Ignite 3 rebuilt it around Raft and Calcite. ScaleOut StateServer: Commercial in-memory data grid for .NET and Java with parallel query, Redis support and in-cache code. Licensing: Apache Ignite is open source (permissive) (Apache License 2.0); ScaleOut StateServer is proprietary (Proprietary). Apache Ignite is built for larger datasets (≤ 1 PB) than ScaleOut StateServer (≤ 10 TB). Transactions: Apache Ignite offers full ACID; ScaleOut StateServer offers limited.

When should I choose Apache Ignite over ScaleOut StateServer?

Choose Apache Ignite for accelerating legacy RDBMS with an in-memory SQL cache layer; real-time risk and pricing calculations; and distributed caching with SQL queries over cached data. Choose ScaleOut StateServer for distributed session state for ASP.NET and Java web farms; low-latency shared object cache for .NET services; and real-time analytics and digital twins over fast-changing data.

Is Apache Ignite or ScaleOut StateServer more popular?

Apache Ignite ranks #98 on the WhichDB Score (28.3/100) and ScaleOut StateServer ranks #806 (0.0/100). Popularity is not fit: check the requirements that matter for your project.

Are Apache Ignite and ScaleOut StateServer open source?

Yes. Apache Ignite is open source. License: Apache License 2.0. No. ScaleOut StateServer is proprietary, closed-source software.