Software · head to head
Cassandra vs DynamoDB
Cassandra
Software
Manage massive amounts of data with linear scalability
- From
- Free
- Rated
- -
DynamoDB
Software
Fast, flexible NoSQL database service for any scale
- From
- On request
- Rated
- -
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; DynamoDB noSQL-only; does not support complex relational queries or SQL joins
- They diverge on capability: Cassandra covers Linear Scalability, DynamoDB covers Single-digit Millisecond Latency.
Where they differ
Only the attributes on which Cassandra and DynamoDB actually diverge.
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 DynamoDB
- Single-digit Millisecond Latency
- Serverless
- Auto-scaling
- Global Tables
- Point-in-time Recovery
- Encryption
- Streams
- Lambda
What people use each for
The jobs each tool is most often brought in to do.
Cassandra
- Real-time applicationsnot DynamoDB
- Content managementnot DynamoDB
- User profilesnot DynamoDB
- Mobile backendsnot DynamoDB
- Cachingnot DynamoDB
DynamoDB
- High-scale, variable-workload applicationsnot Cassandra
- Mobile and IoT device backendsnot Cassandra
- Real-time analytics and dashboardsnot Cassandra
- Multi-region, globally distributed applicationsnot Cassandra
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
DynamoDB
- NoSQL-only; does not support complex relational queries or SQL joins
- Limited query flexibility; requires thinking in terms of keys and indexes rather than ad-hoc queries
Pricing, plan by plan
Cassandra
FreeNo published plan breakdown. See the Cassandra review.
DynamoDB
On requestNo published plan breakdown. See the DynamoDB 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.
Choose DynamoDB if
- You need single-digit millisecond latency.
- You work on AWS.
- You also want serverless.
Questions people ask
- Is Cassandra or DynamoDB better?
- Neither clearly leads. Cassandra starts at Free and DynamoDB at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Cassandra or DynamoDB?
- Cassandra has a free tier; the other does not. Paid plans start at Free for Cassandra and On request for DynamoDB.
- Does Cassandra or DynamoDB run on more platforms?
- Cassandra runs on Linux, macOS, Windows, Docker, Kubernetes. DynamoDB runs on AWS.
- Can I use Cassandra for free?
- Yes. Cassandra has a free tier, so you can try it without paying. DynamoDB 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 DynamoDB is typically brought in for.
- What can Cassandra do that DynamoDB cannot?
- Cassandra covers Linear Scalability, Fault Tolerance, Multi-datacenter Replication, Tunable Consistency. DynamoDB covers Single-digit Millisecond Latency, Serverless, Auto-scaling, Global Tables.
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.
SourceCassandra: 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.
SourceCassandra: 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.
SourceCassandra: 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.
SourceCassandra: 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