CockroachDB vs MongoDB Atlas
Pricing
CockroachDB: 30-day trial with $400 credit, then from $0.092 per vCPU-hour
MongoDB Atlas: Free tier (512 MB), Dedicated from $57/mo
Description
CockroachDB: Distributed SQL database that survives outages, Postgres-compatible, with usage-based cloud pricing
MongoDB Atlas: Managed MongoDB in the cloud: document database with flexible schemas and a massive ecosystem
Pros
- Postgres-compatible wire protocol: use your existing Postgres drivers and ORMs
- New cloud organizations get a 30-day trial with $400 of credit, no credit card needed for Standard
- Multi-region by design: your data survives zone and region failures automatically
- 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
Cons
- No free tier for new customers: after the trial, Standard costs about $203/mo for 2 vCPUs and 100 GB
- Higher query latency than single-region Postgres (consensus overhead on every write)
- Overkill for most solo founder projects: distributed consistency adds complexity you rarely need
- Some Postgres features are missing or behave differently (limited extensions, partial full-text search functions)
- 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
Details
CockroachDB is a distributed SQL database that speaks the Postgres wire protocol. Your existing Postgres drivers, ORMs, and queries work without changes. The key selling point is resilience: data is automatically replicated across nodes, so a zone going down does not take your database offline.
Cloud pricing for new deployments from 15 September 2026 is pay-as-you-go. Every new organization gets a 30-day trial with $400 of credit. After that, clusters pause until you add a payment method and are deleted after a 30-day grace period. The Standard edition costs $0.092 per vCPU-hour, about $203 a month for 2 vCPUs and 100 GB, and Mission Critical costs $0.162 per vCPU-hour. Existing customers stay on their current plans. For most solo founders this is more database than you need, both in cost and in write latency. For simpler use cases, Neon or Supabase give you standard Postgres with free tiers.
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.
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