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Cassandra vs Convex

Cassandra logo

Cassandra

Software

Manage massive amounts of data with linear scalability

From
Free
Rated
-
Full reviewWebsite
C

Convex

Software

The reactive backend platform that keeps up with you and your agents

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Cassandra has a free tier, so it costs nothing to try first.
  • Each has a real cost: Cassandra no support for joins across tables; Convex the Free and Starter tier includes only 1 million function calls and 0.5 GB of database storage per month before per-unit overage charges of $2.20 per million calls apply, as of August 2026.

Where they differ

Only the attributes on which Cassandra and Convex actually diverge.

Attributes where Cassandra and Convex differ
AttributeCassandraConvex
Starting priceFreeOn request
Pricing modelUnknownusage-based
Free tierYesNo
PlatformsLinux, macOS, Windows, Docker, KubernetesWeb
Founded2008Unknown

Identical on both: 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 Cassandra

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

Only in Convex

Nothing recorded that Cassandra does not also cover.

What people use each for

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

Cassandra

  • Real-time applicationsnot Convex
  • Content managementnot Convex
  • User profilesnot Convex
  • Mobile backendsnot Convex
  • Cachingnot Convex

Convex

No use cases recorded yet. See the Convex review.

Where each one falls short

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

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

Convex

  • The Free and Starter tier includes only 1 million function calls and 0.5 GB of database storage per month before per-unit overage charges of $2.20 per million calls apply, as of August 2026.

Pricing, plan by plan

Cassandra

Free

No published plan breakdown. See the Cassandra review.

Convex

On request

No published plan breakdown. See the Convex review.

Which should you pick?

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

Choose Convex if

Nothing in the data separates Convex from Cassandra on the points above - pick on price and on how each one feels to use.

Convex review

Questions people ask

Is Cassandra or Convex better?
Neither clearly leads. Cassandra starts at Free and Convex at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Cassandra or Convex?
Cassandra has a free tier; the other does not. Paid plans start at Free for Cassandra and On request for Convex.
Does Cassandra or Convex run on more platforms?
Cassandra runs on Linux, macOS, Windows, Docker, Kubernetes. Convex runs on Web.
Can I use Cassandra for free?
Yes. Cassandra has a free tier, so you can try it without paying. Convex starts at On request.
What is Cassandra best used for?
Cassandra is most often used for real-time applications, content management, user profiles, mobile backends. Of those, real-time applications and content management are not what Convex is typically brought in for.
What can Cassandra do that Convex cannot?
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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