- Price
- Free; Flex from $8 up to $30/month
- Free plan
- Yes
- Setup
- Needs a developer
- Up and running
- A free cluster in about 10 minutes; the backend API around it takes a few days.
What MongoDB Atlas is for
MongoDB Atlas hosts a MongoDB database for you on AWS, Google Cloud or Azure. Instead of tables with fixed columns, it stores each record as a flexible JSON document, which suits data that changes shape, like chat history or AI agent output. It also does vector search for AI features in the same database. It's only the database: login and the API your app calls are yours to build.
How it plugs into your product
- 1Create an account at mongodb.com/atlas and deploy a cluster (free M0, Flex or dedicated), choosing cloud and region.
- 2Create a database user and allow the IP addresses of your server to connect.
- 3On your backend, install the MongoDB driver (or Mongoose) and put the connection string in the environment variables.
- 4Build your own API and login in front of it, since the app shouldn't talk to the database directly.
Does it fit your idea?
It fits if
- An AI app that stores conversations, prompts and agent results as loose JSON and wants vector search in the same place.
- A catalog or marketplace where each product has different fields depending on the category.
- A team that already knows Node.js and MongoDB and has its own backend.
Look elsewhere if
- Your core data is billing, plans and permissions that need joins and transactions across tables.
- You want login, file storage and a ready API in the same product: Supabase or Firebase include them.
- You expect to pass 5 GB soon and want to stay under $30 a month: the next step is the dedicated M10, from about $57.
What people only find out after building
Read this before you build on it. Each item links to the official page that says so.
A free cluster with zero connections for 30 days is paused automatically, and you get only one free cluster per project.
Official source: mongodb.comThe free cluster handles up to 100 operations per second and 512 MB, and some features like Performance Advisor and server-side JavaScript are off.
Official source: mongodb.comFlex stops at 5 GB with no automatic growth, takes one fixed snapshot a day and has no point-in-time restore; past that you move to a dedicated M10.
Official source: mongodb.comAtlas's built-in Data API, HTTPS endpoints, Device Sync and app hosting reached end of life on September 30, 2025, so old tutorials that skip the backend no longer work.
Official source: mongodb.com
Price
Free; Flex from $8 up to $30/month
M0 cluster free forever with 512 MB of storage.
- Free tier
- 512 MB (M0 cluster)
- First paid plan
- Flex: $8 to $30/month
- Database type
- NoSQL documents (MongoDB)
Checked on Oct 28, 2026 · official pricing
What it costs in practice
A SaaS with 2,000 monthly active users and 3 GB of data outgrows the free 512 MB and goes to Flex: $8/month at up to 100 operations per second, capped at $30/month at the 400 to 500 tier. Past 5 GB, a dedicated M10 starts at about $57/month (estimate).
Estimate from the official price. Check it before you decide.
At a glance
- Free plan: yes
- Open source: no
“Not stated” means the official site doesn’t say.
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