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YugabyteDB vs Cassandra

YugabyteDB logo

YugabyteDB

Software

Open source distributed SQL database for cloud native apps

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: YugabyteDB missing PostgreSQL functions and extensions despite claiming compatibility; Cassandra no support for joins across tables
  • They diverge on capability: YugabyteDB covers PostgreSQL Compatible, Cassandra covers Fault Tolerance.

Where they differ

Only the attributes on which YugabyteDB and Cassandra actually diverge.

Attributes where YugabyteDB and Cassandra differ
AttributeYugabyteDBCassandra
PlatformsCloud, On-premises, KubernetesLinux, macOS, Windows, Docker, Kubernetes
Founded20162008

Identical on both: starting price (Free), pricing model (Unknown), 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 YugabyteDB

  • PostgreSQL Compatible
  • Distributed SQL
  • Geo-distribution
  • High Availability
  • ACID Transactions
  • CDC Support
  • PostgreSQL
  • Cassandra

Only in Cassandra

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

Both cover

  • Linear Scalability
  • Linux support
  • Mac support
  • Docker support

What people use each for

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

YugabyteDB

  • Transaction processingnot Cassandra
  • Data storagenot Cassandra
  • Application backendnot Cassandra
  • Reportingnot Cassandra
  • Data analyticsnot Cassandra

Cassandra

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

Where each one falls short

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

YugabyteDB

  • Missing PostgreSQL functions and extensions despite claiming compatibility
  • Not a true PostgreSQL replacement requiring schema and query compatibility testing before migration
  • Requires careful isolation level management or risk data corruption in production
  • Lacks built-in OLAP capabilities, requiring external systems for analytics
  • Coupled compute and storage scaling reduces optimization flexibility

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

YugabyteDB

Free

No published plan breakdown. See the YugabyteDB review.

Cassandra

Free

No published plan breakdown. See the Cassandra review.

Which should you pick?

Choose YugabyteDB if

  • You need postgresql compatible.
  • You want to start without paying.
  • You work on Cloud, On-premises, Kubernetes.
  • You also want distributed sql.
YugabyteDB review

Choose Cassandra if

  • You need fault tolerance.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Docker, Kubernetes.
  • You also want multi-datacenter replication.
Cassandra review

Questions people ask

Is YugabyteDB or Cassandra better?
Neither clearly leads. YugabyteDB 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, YugabyteDB or Cassandra?
YugabyteDB starts at Free and Cassandra at Free.
Does YugabyteDB or Cassandra run on more platforms?
YugabyteDB runs on Cloud, On-premises, Kubernetes. Cassandra runs on Linux, macOS, Windows, Docker, Kubernetes.
Can I use YugabyteDB for free?
Both have a free tier, so you can try either at no cost before committing.
What is YugabyteDB best used for?
YugabyteDB is most often used for transaction processing, data storage, application backend, reporting. Of those, transaction processing and data storage are not what Cassandra is typically brought in for.
What can YugabyteDB do that Cassandra cannot?
YugabyteDB covers PostgreSQL Compatible, Distributed SQL, Geo-distribution, High Availability. Cassandra covers Fault Tolerance, Multi-datacenter Replication, Tunable Consistency, CQL Query Language. Both handle Linear Scalability, Linux support, Mac support, Docker support.

Answered from the vendors’ own pages

YugabyteDB: Is YugabyteDB a true drop-in replacement for PostgreSQL?

No, YugabyteDB is PostgreSQL-compatible but not a zero-change drop-in replacement. It requires compatibility testing with queries, stored procedures, and ORM configurations before migration.

Source
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
YugabyteDB: What isolation levels does YugabyteDB support?

YugabyteDB allows per-query selection between serializable isolation for critical operations and read-committed for analytics. However, this flexibility requires careful management to avoid accidental data corruption.

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
YugabyteDB: Does YugabyteDB support both SQL and NoSQL workloads?

Yes, YugabyteDB offers YSQL for PostgreSQL-compatible SQL and YCQL for Cassandra-like NoSQL workloads, using the same DocDB storage engine to support both simultaneously.

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
YugabyteDB: Can YugabyteDB scale compute and storage independently?

No, YugabyteDB couples compute and storage scaling, unlike TiDB which separates them. This means scaling decisions are less flexible and optimization is more complex.

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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