whichdb
vs

Firebird vs NexusDB

Firebird: Lightweight, MVCC relational database from the InterBase lineage, embeddable or client-server. NexusDB: Commercial embedded and client/server SQL database for Delphi and C++Builder, successor to FlashFiler.

key differences

  • Licensing: Firebird is open source (copyleft) (InterBase Public License / Initial Developer's Public License (MPL-style)); NexusDB is proprietary (Commercial; free embedded edition).
  • Only Firebird has triggers, compression, role-based access.
  • Only NexusDB has full-text search, in-memory.

choose firebird for

  • +Desktop and Delphi business applications
  • +Embedded databases in point-of-sale or ERP software
  • +Departmental client-server systems
  • +Migration target for InterBase deployments

best at · OLTP, Embedded

choose nexusdb for

  • +Desktop and line-of-business apps built with Delphi or C++Builder
  • +Migrating BDE/Paradox or FlashFiler applications
  • +Small client/server deployments in Windows shops

best at · OLTP, Embedded

FirebirdLightweight, MVCC relational database from the InterBase lineage, embeddable or client-server.
NexusDBCommercial embedded and client/server SQL database for Delphi and C++Builder, successor to FlashFiler.
overview
Primary model
Relational
Relational
Also supports
–
–
Type
Database engine
Database engine
Status
Active
Active
Developer
Firebird Project (Firebird Foundation)
NexusDB Pty Ltd
First release
2000
2003
Latest version
5.0.4 (Apr 17, 2026)
4.75.20 (Apr 14, 2026)
License
Open source (copyleft)InterBase Public License / Initial Developer's Public License (MPL-style)
ProprietaryCommercial; free embedded edition
Free tier
✓
✓
popularity
WhichDB Score
32.8
3.6
Rank
#68
#431
GitHub stars
1.5K
–
Stack Overflow questions
3.8K
–
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
Strict
Architecture
Client server, Embedded, Single node
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
SQL, PSQL
SQL
Client languages
Java, C#, .NET, Python, Delphi, PHP, JavaScript, Go
Delphi, C++Builder, C#, PHP
Best for
OLTP, Embedded
OLTP, Embedded
Add more to this comparisonNot sure either fits? Try smart match

Firebird vs NexusDB: FAQ

What is the difference between Firebird and NexusDB?

Firebird: Lightweight, MVCC relational database from the InterBase lineage, embeddable or client-server. NexusDB: Commercial embedded and client/server SQL database for Delphi and C++Builder, successor to FlashFiler. Licensing: Firebird is open source (copyleft) (InterBase Public License / Initial Developer's Public License (MPL-style)); NexusDB is proprietary (Commercial; free embedded edition). Only Firebird has triggers, compression, role-based access. Only NexusDB has full-text search, in-memory.

When should I choose Firebird over NexusDB?

Choose Firebird for desktop and Delphi business applications; embedded databases in point-of-sale or ERP software; and departmental client-server systems. Choose NexusDB for desktop and line-of-business apps built with Delphi or C++Builder; migrating BDE/Paradox or FlashFiler applications; and small client/server deployments in Windows shops.

Is Firebird or NexusDB more popular?

Firebird ranks #68 on the WhichDB Score (32.8/100) and NexusDB ranks #431 (3.6/100). Popularity is not fit: check the requirements that matter for your project.

Are Firebird and NexusDB open source?

Yes. Firebird is open source. License: InterBase Public License / Initial Developer's Public License (MPL-style). No. NexusDB is proprietary, closed-source software. License: Commercial; free embedded edition.