MongoDB Atlas vs PlanetScale
Pricing
MongoDB Atlas: Free tier (512 MB), Dedicated from $57/mo
PlanetScale: Postgres from $5/mo, Vitess (MySQL) from $39/mo, no free tier
Description
MongoDB Atlas: Managed MongoDB in the cloud: document database with flexible schemas and a massive ecosystem
PlanetScale: Managed Postgres and Vitess (MySQL) databases with git-like branching for safe schema changes
Pros
- Free tier with 512 MB storage that never pauses or sleeps
- Flexible document model: no migrations needed when your schema changes
- Largest NoSQL ecosystem: drivers for every language, huge community, extensive docs
- Database branching lets you test schema changes without touching production
- Non-blocking schema migrations on Vitess: no downtime during changes
- Postgres starts at $5/mo for a single node, or $15/mo with high availability
Cons
- Document databases encourage denormalization that becomes messy as your app grows
- Dedicated clusters start at $57/mo: the jump from free to paid is steep
- Aggregation pipeline syntax has a steep learning curve compared to SQL
- No free tier, and Vitess (MySQL) databases start at $39/mo
- The $5 Postgres node is tiny (1/16 vCPU, 512 MiB of memory), so production apps usually need more
- Foreign keys on Vitess must be turned on per database and work only on unsharded databases
Details
MongoDB Atlas is the managed cloud version of MongoDB, the most popular document database. You get a free shared cluster with 512 MB of storage that stays running 24/7, no pausing for inactivity like some competitors. Documents store as JSON-like objects, so your data structure can evolve without formal migrations. This makes it fast to prototype with.
The tradeoff is well-documented: document databases trade query flexibility for schema flexibility. As your app grows, you may find yourself duplicating data across collections or writing complex aggregation pipelines that would be simple JOINs in SQL. For solo founders, MongoDB works best when your data is naturally document-shaped (CMS content, user profiles, event logs). If your data has lots of relationships, Postgres on Supabase or Neon will save you headaches down the road.
PlanetScale brings git workflows to your database. Create a branch, change your schema, test it, then merge it into production with zero downtime. No more scary migration scripts run against your live database at 2 AM.
The big hit was losing the free tier in 2024, which pushed many indie developers to alternatives like Neon and Supabase. PlanetScale now sells managed Postgres as well as Vitess, its MySQL-compatible option built on the technology that powers YouTube. A single-node Postgres database starts at $5 a month and a three-node high-availability cluster at $15, while Vitess starts at $39. That brings a small database within reach of side projects, but Neon (Postgres, free tier) and Supabase (Postgres plus extras, free tier) are still the cheaper places to start.
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