MongoDB vs PlanetScale: Which Database is Right for You?
Compare MongoDB and PlanetScale for your database needs. MongoDB offers a flexible document database with a generous free tier, while PlanetScale provides a serverless MySQL platform with branching workflows.
Updated 2026-03 · 2026
MongoDB
Document database with flexible schema and powerful querying
Strengths
- +Generous free tier (512MB storage, shared cluster)
- +Flexible document model with no rigid schema
- +Rich query language with aggregation framework
Weaknesses
- -Can be overkill for simple relational data
- -Steeper learning curve than traditional SQL
- -Free tier has connection limits (500 concurrent)
Best for
Teams building applications with evolving data models, unstructured data, or needing flexible schema design
PlanetScale
Serverless MySQL platform with Git-like branching workflows
Strengths
- +Database branching for safe schema changes
- +Serverless scaling with no connection limits
- +Built on Vitess (powers YouTube, Slack)
Weaknesses
- -MySQL only (no PostgreSQL or other databases)
- -No foreign key constraints in production
- -Limited to 3 databases on free tier
Best for
Teams using MySQL who want modern deployment workflows, serverless scaling, and safe schema change management
Feature Comparison
| Feature | ||
|---|---|---|
| Free Tier Storage | 512MB | 5GB |
| Database Type | Document (NoSQL) | Relational (MySQL) |
| Schema Flexibility | Schemaless documents | Fixed schema with migrations |
| Branching/Versioning | Not available | Git-like database branches |
| Query Language | MongoDB Query Language (MQL) | Standard SQL |
| Connection Limits | 500 concurrent (free tier) | Unlimited (serverless) |
| Horizontal Scaling | Native sharding support | Automatic via Vitess |
| Schema Migrations | Manual or via tools | Non-blocking, automated |
| Foreign Keys | Not applicable (document model) | Not supported in production |
| Backup & Recovery | Continuous backups (paid tiers) | Daily backups included |
| Multi-Region | Available on paid tiers | Available on paid tiers |
| Starting Price (Paid) | $57/month (M10 cluster) | $39/month (Scaler plan) |
The Verdict
Choose MongoDB if you need flexible schema design, document-based data models, or are building applications where data structure evolves frequently. Choose PlanetScale if you're committed to MySQL, want modern deployment workflows with database branching, or need serverless scaling without connection limits. PlanetScale offers more free storage (5GB vs 512MB), while MongoDB provides more flexibility in data modeling.