MongoDB vs Apache Cassandra: Head-to-Head Comparison

Quick Verdict

MongoDB is the better pick for apps with evolving, document-shaped data. Apache Cassandra is the better pick for write-heavy workloads needing high availability across regions.

---

At a Glance

Feature	MongoDB	Apache Cassandra
Best For	Apps with evolving, document-shaped data	Write-heavy workloads needing high availability across regions
Pricing	Free community server; paid Atlas cloud	Free and open source
Free to Start	Yes	Yes
License	Source-available	Open source
Deployment	Self-hosted or managed cloud	Self-hosted or managed cloud
Link	Visit MongoDB	Visit Apache Cassandra

---

Detailed Breakdown

MongoDB

Document database with flexible schemas

Pros:

• Flexible JSON-like documents
• Atlas managed service
• Built-in horizontal sharding

Cons:

• SSPL license
• Joins are less natural than in SQL

---

Apache Cassandra

Distributed wide-column NoSQL database

Pros:

• Linear horizontal scaling
• No single point of failure
• Multi-datacenter replication

Cons:

• Query patterns must be designed upfront
• Operationally demanding

---

Key Differences

• Positioning: MongoDB — document database with flexible schemas. Apache Cassandra — distributed wide-column NoSQL database.
• Licensing differs: MongoDB is source-available while Apache Cassandra is open source.
• Pricing: MongoDB — free community server; paid Atlas cloud. Apache Cassandra — free and open source.
• Signature strength: MongoDB — flexible JSON-like documents. Apache Cassandra — linear horizontal scaling.

---

Frequently Asked Questions

Is MongoDB better than Apache Cassandra?

It depends on your requirements. MongoDB is a strong fit for apps with evolving, document-shaped data, while Apache Cassandra suits write-heavy workloads needing high availability across regions.

Is MongoDB free to use?

Yes, you can start with MongoDB for free. Pricing model: Free community server; paid Atlas cloud.

Is Apache Cassandra free to use?

Yes, you can start with Apache Cassandra for free. Pricing model: Free and open source.

Can I self-host MongoDB or Apache Cassandra?

MongoDB can be self-hosted. Deployment options: self-hosted or managed cloud. Apache Cassandra can be self-hosted. Deployment options: self-hosted or managed cloud.

What are the main drawbacks of MongoDB and Apache Cassandra?

MongoDB: SSPL license; joins are less natural than in SQL. Apache Cassandra: query patterns must be designed upfront; operationally demanding.