whichdb
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ObjectDB vs ZODB

ObjectDB: Commercial object database for Java that implements JPA and JDO natively, with no ORM layer. ZODB: Transparent persistence for Python objects with ACID transactions and history.

key differences

  • Licensing: ObjectDB is proprietary (ObjectDB Licence (free edition with limits; commercial)); ZODB is open source (permissive) (Zope Public License 2.1).
  • Only ObjectDB has joins, secondary indexes.
  • Only ZODB has in-memory, time travel, online schema changes.

choose objectdb for

  • +Java desktop applications with complex object models
  • +JPA-based apps that want to avoid Hibernate tuning
  • +Embedded storage in Java tools

best at · Embedded, OLTP

choose zodb for

  • +Plone and Zope CMS deployments
  • +Python apps with complex, deeply nested object models
  • +Prototyping persistence without designing a schema

best at · Embedded, Content

ObjectDBCommercial object database for Java that implements JPA and JDO natively, with no ORM layer.
ZODBTransparent persistence for Python objects with ACID transactions and history.
overview
Primary model
Object
Object
Also supports
–
Key-Value
Type
Database engine
Embedded library
Status
Active
Active
Developer
ObjectDB Software
Zope Foundation
First release
2003
1998
Latest version
2.9.5 (Mar 2, 2026)
6.4 (Oct 12, 2026)
License
ProprietaryObjectDB Licence (free edition with limits; commercial)
Open source (permissive)Zope Public License 2.1
Free tier
✓
✓
popularity
WhichDB Score
9.3
22.7
Rank
#315
#134
GitHub stars
–
761
Stack Overflow questions
105
190
scale & guarantees
Comfortable data size
Small (≤ 100 GB)
Small (≤ 100 GB)
Horizontal scaling
None
None
Multi-region
None
None
ACID
Full
Full
Consistency
Strong
Strong
Schema
Strict
Schemaless
Architecture
Embedded, Client server
Embedded, Client server
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
JPQL, JDOQL
Python (object traversal)
Client languages
Java
Python
Best for
Embedded, OLTP
Embedded, Content
Add more to this comparisonNot sure either fits? Try smart match

ObjectDB vs ZODB: FAQ

What is the difference between ObjectDB and ZODB?

ObjectDB: Commercial object database for Java that implements JPA and JDO natively, with no ORM layer. ZODB: Transparent persistence for Python objects with ACID transactions and history. Licensing: ObjectDB is proprietary (ObjectDB Licence (free edition with limits; commercial)); ZODB is open source (permissive) (Zope Public License 2.1). Only ObjectDB has joins, secondary indexes. Only ZODB has in-memory, time travel, online schema changes.

When should I choose ObjectDB over ZODB?

Choose ObjectDB for java desktop applications with complex object models, JPA-based apps that want to avoid Hibernate tuning and embedded storage in Java tools. Choose ZODB for plone and Zope CMS deployments; python apps with complex, deeply nested object models; and prototyping persistence without designing a schema.

Is ObjectDB or ZODB more popular?

ZODB ranks #134 on the WhichDB Score (22.7/100) and ObjectDB ranks #315 (9.3/100). Popularity is not fit: check the requirements that matter for your project.

Are ObjectDB and ZODB open source?

No. ObjectDB is proprietary, closed-source software. License: ObjectDB Licence (free edition with limits; commercial). Yes. ZODB is open source. License: Zope Public License 2.1.