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FaunaDB vs Cassandra

FaunaDB logo

FaunaDB

Software

The distributed serverless database for modern applications

From
Free
Rated
-
Full reviewWebsite
Cassandra logo

Cassandra

Software

Manage massive amounts of data with linear scalability

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: FaunaDB the Internet Archive's capture of FaunaDB's homepage on 5 January 2019 confirmed a free 'Try Cloud' tier alongside a self-hosted download, with a separate Pricing page linked but not itself retrievable from the archive within two attempts.; Cassandra no support for joins across tables
  • They diverge on capability: FaunaDB covers ACID Transactions, Cassandra covers Linear Scalability.

Where they differ

Only the attributes on which FaunaDB and Cassandra actually diverge.

Attributes where FaunaDB and Cassandra differ
AttributeFaunaDBCassandra
Pricing modelfreemiumUnknown
PlatformsWebLinux, macOS, Windows, Docker, Kubernetes
Founded20122008

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Unknown).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in FaunaDB

  • ACID Transactions
  • Document-relational Model
  • GraphQL API
  • Global Distribution
  • Temporal Queries
  • Multi-tenancy
  • Serverless
  • GraphQL

Only in Cassandra

  • Linear Scalability
  • Fault Tolerance
  • Multi-datacenter Replication
  • Tunable Consistency
  • CQL Query Language
  • Distributed Architecture
  • No Single Point of Failure
  • DataStax

What people use each for

The jobs each tool is most often brought in to do.

FaunaDB

  • Serverless applicationsnot Cassandra
  • Rapid prototypingnot Cassandra
  • Mobile backends
  • JAMstacknot Cassandra
  • Microservicesnot Cassandra

Cassandra

  • Real-time applicationsnot FaunaDB
  • Content managementnot FaunaDB
  • User profilesnot FaunaDB
  • Mobile backends
  • Cachingnot FaunaDB

Both are used for mobile backends, on those jobs the choice comes down to price and fit rather than capability.

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

FaunaDB

  • The Internet Archive's capture of FaunaDB's homepage on 5 January 2019 confirmed a free 'Try Cloud' tier alongside a self-hosted download, with a separate Pricing page linked but not itself retrievable from the archive within two attempts.

Cassandra

  • No support for joins across tables
  • No ACID transactions across multiple rows
  • Data model must be designed around query patterns upfront, making schema evolution difficult
  • Partition key misconfigurations can cause uneven data distribution and hotspots that degrade performance

Pricing, plan by plan

FaunaDB

Free
  • FreeFree
    • 100K read ops
    • 50K write ops
    • 1GB storage
  • Pro$25/month
    • Pay per use
    • Priority support
    • Advanced features

Cassandra

Free

No published plan breakdown. See the Cassandra review.

Which should you pick?

Choose FaunaDB if

  • You need acid transactions.
  • You want to start without paying.
  • You also want document-relational model.
FaunaDB review

Choose Cassandra if

  • You need linear scalability.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Docker, Kubernetes.
  • You also want fault tolerance.
Cassandra review

Questions people ask

Is FaunaDB or Cassandra better?
Neither clearly leads. FaunaDB starts at Free and Cassandra at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, FaunaDB or Cassandra?
FaunaDB starts at Free and Cassandra at Free.
Does FaunaDB or Cassandra run on more platforms?
FaunaDB runs on Web. Cassandra runs on Linux, macOS, Windows, Docker, Kubernetes.
Can I use FaunaDB for free?
Both have a free tier, so you can try either at no cost before committing.
What is FaunaDB best used for?
FaunaDB is most often used for serverless applications, rapid prototyping, mobile backends, jamstack. Of those, serverless applications and rapid prototyping are not what Cassandra is typically brought in for.
What can FaunaDB do that Cassandra cannot?
FaunaDB covers ACID Transactions, Document-relational Model, GraphQL API, Global Distribution. Cassandra covers Linear Scalability, Fault Tolerance, Multi-datacenter Replication, Tunable Consistency.

Answered from the vendors’ own pages

Cassandra: Does Cassandra support joins between tables?

No. Cassandra does not support joins or foreign keys. The data model requires denormalization, meaning data must be duplicated across tables to support different query patterns.

Source
Cassandra: Does Cassandra offer ACID transactions?

No. Cassandra provides only row-level atomicity and isolation, not full ACID transactions across multiple rows or tables. It uses lightweight transactions via Paxos for per-row compare-and-set operations.

Source
Cassandra: What programming languages can connect to Cassandra?

Cassandra supports official drivers for multiple languages including Python, Java, Node.js, and Go, allowing applications to communicate via the native Cassandra protocol.

Source
Cassandra: Can I deploy Cassandra in the cloud?

Yes. Cassandra can run on any cloud platform (AWS, Google Cloud, Azure) via Docker, virtual machines, or managed services like DataStax Astra DB, which provides a fully managed DBaaS option.

Source
Cassandra: Does Cassandra have a free option?

The open source Apache Cassandra is free. DataStax also offers Astra DB with a free tier providing up to 25GB storage and 25 million read/write operations per month.

Source
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