MongoDB alternatives: 13 database management systems compared
Teams ask for a MongoDB Atlas alternative when a prototype cluster becomes a production bill with Search, Vector Search and Stream Processing priced on top, when the Server Side Public Licence blocks a plan to resell or embed the server, or when a cloud commitment elsewhere makes a native service cheaper to run. They go to MongoDB-compatible engines, other document stores, or SQL databases with JSON support.
Short answer: Challengers take places 1 to 3 here. Big brands follow in the order of our category ranking. For MongoDB users, the top three picks from our database management system ranking are FerretDB, RavenDB and SurrealDB. Pick FerretDB if you want MongoDB drivers kept but the server replaced by software you run on PostgreSQL. Each of the 13 alternatives sits in Best Database Management Systems in 2026 and is described against MongoDB.
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Pricing: Free Atlas cluster of 512 MB; Flex and Dedicated billed by the hour, published
Established in: United States
Built for: Teams building around JSON documents who prefer a managed cloud service
Not for: Buyers who need an OSI-approved licence for the server
01
Why buyers look past MongoDB
01
The bill grows by service, not just by cluster
Atlas lists Free at 512 MB, Flex from $0.011 per hour up to $30 a month with 5 GB, and Dedicated from $0.08 per hour (from $56.94 a month, 10 GB to 4 TB). Search, Vector Search, Stream Processing, Data Federation and Online Archive each have their own pricing pages, so a feature added later is a new line on the invoice.
02
The server licence limits what you can build on it
Community Edition is free but sits under the SSPL. Section 13 of that licence says that anyone making the functionality available to third parties as a service must publish the service source code, which stops hosting providers and many resellers. Self-managed Enterprise Advanced is sold by contacting sales, not from a price list.
03
Compatibility layers now exist on every large cloud
Amazon DocumentDB, Azure Cosmos DB and Firestore each offer a MongoDB-compatible API, and FerretDB does it on PostgreSQL. Each supports part of the MongoDB feature set, so the real work in a move is testing your own queries, indexes and aggregation stages against the target.
you only used MongoDB as a cache or session store and a primary database is already in place
#6
03
What each one does differently
1
FerretDB
Not stated by the vendor · Published
A proxy under the Apache-2.0 licence that accepts MongoDB 5.0+ wire protocol and stores documents in PostgreSQL with the DocumentDB extension. It is a library of compatibility, not a full clone: the project keeps a public list of known differences. No managed service is listed in its docs.
Switch from MongoDB if you want MongoDB drivers kept but the server replaced by software you run on PostgreSQL.
A document database from RavenDB Ltd, headquartered in Hadera, Israel, with ACID transactions, auto-created indexes and its own query language, RQL. The free Community licence allows commercial use but caps a cluster at 3 cores and 6 GB of RAM. It does not speak the MongoDB wire protocol, so code is rewritten.
Switch from MongoDB if you accept a new driver and query language for a database that indexes itself and ships a Management Studio.
One engine for documents, relations, graph edges and vectors, queried in SurrealQL. The core is under the Business Source License 1.1 with a change date of 1 January 2030, and reselling it as a database service is barred. The cloud has a free 1 GB instance. No MongoDB drivers.
Switch from MongoDB if you want documents and graph relations behind one query language and will rewrite data access.
JSON documents queried with SQL++ instead of MongoDB's aggregation pipeline. Capella is billed per node-hour (Basic from $0.15 per hour per node) and a free cluster is one node with 8 GB and forum support. Mobile sync is sold alongside. Self-managed prices are not published.
Switch from MongoDB if you want SQL-style joins over JSON and offline sync for mobile clients.
A wide-column engine that answers to Cassandra and DynamoDB APIs, tuned for sustained write throughput with one shard per CPU core. ScyllaDB Cloud runs on AWS and Google Cloud with Standard, Professional and Premium support tiers. Releases moved from AGPL to a source-available licence from version 2025.1.
Switch from MongoDB if your workload is high-volume key access and you no longer need flexible document queries.
A relational engine whose jsonb type stores and indexes documents while keeping joins, constraints and SQL. It is released under the PostgreSQL Licence, a permissive one, and sold by nobody, so hosting and support come from third parties. The data model changes from collections to tables.
Switch from MongoDB if your documents are partly structured and you want one engine for JSON and relational data.
Distributed SQL with PostgreSQL-compatible syntax, billed in the cloud per vCPU-hour (Standard at $0.092 per vCPU-hour on the pricing page). New cloud organisations get a 30-day trial with $400 credit. The code moved to the CockroachDB Software Licence, and self-hosted use is free only below a revenue limit.
Switch from MongoDB if you want to keep transactions across regions and can move from documents to SQL tables.
Masterless wide-column storage published by the Apache Software Foundation under Apache Licence 2.0, with no vendor selling it. Every node does the same job, so capacity grows by adding nodes. CQL has no joins, so tables are designed around queries rather than documents.
Switch from MongoDB if you need open-licensed storage for large write volumes and can model data per query.
Google Cloud's serverless document database. Its Enterprise edition adds a MongoDB-compatible API next to the native Firestore one. Billing is per document read, write and delete plus storage, with a daily free quota on the Standard edition. It exists only on Google Cloud.
Switch from MongoDB if your applications already run on Google Cloud and you want no capacity to provision.
A managed service on AWS that implements the MongoDB API for versions 3.6, 4.0, 5.0 and 8.0 drivers. It bills instances by the second, plus I/O, storage and backup, with an I/O-Optimized option that removes the I/O line. AWS says most MongoDB applications work, not all of them.
Switch from MongoDB if your estate is on AWS and you want to keep MongoDB drivers under an AWS bill.
Microsoft's multi-model service, with an API for MongoDB among several APIs. Throughput is bought in request units per second; a free tier gives 1,000 RU/s and 25 GB per month on one account. Microsoft's own MongoDB page points migrations needing full MQL to a separate service, Azure DocumentDB.
Switch from MongoDB if your applications run on Azure and you accept request-unit billing in return for global distribution.
AWS key-value and document store billed per request or on provisioned capacity, with 25 GB in the monthly free allowance. There are no joins and ad hoc queries are limited; tables are designed around access patterns. It runs only on AWS, so leaving later means rewriting data access.
Switch from MongoDB if you want no servers or clusters to size and your access patterns are known in advance.
An in-memory store for caches, sessions and queues, with a free cloud database of 30 MB and Essentials from $0.007 per hour. It holds data in RAM, so it sits beside a main database rather than replacing one.
Switch from MongoDB if you only used MongoDB as a cache or session store and a primary database is already in place.
Staying on Atlas is reasonable when your application depends on the aggregation pipeline, Atlas Search or Vector Search in the same cluster, and you run across AWS, Azure and Google Cloud, which the pricing page lists as the Atlas hosting options. If the free and Flex tiers hold your data for now, the cost problem has not started, and a migration to a compatibility layer would add risk without a saving.
05
What moving off MongoDB involves
01
Test compatibility with your own queries first
FerretDB, DocumentDB, Cosmos DB and Firestore each publish what they do not support. Export a sample of production queries, run them against the target, and list every aggregation stage, index type and transaction pattern that fails. Do this before any price comparison, because a lower rate does not help if code must change.
02
Move to a different data model only with a reason
RavenDB, SurrealDB, Couchbase and PostgreSQL do not take MongoDB drivers. That means rewriting data access and often reshaping documents, so schedule it as a project. In return you may gain joins, a permissive licence or one engine instead of two.
03
Plan the export and the bill together
Atlas bills by the hour with monthly invoices, so a parallel run during migration pays twice for a period. Decide in advance how long both systems stay live, and read the target's pricing page for I/O, request units or per-read charges that Atlas does not use.
06
Questions about replacing MongoDB
6 answers
Is there a free MongoDB Atlas alternative?
Yes, several. FerretDB is Apache-2.0 and free to run on PostgreSQL, PostgreSQL itself is free under its licence, and Apache Cassandra is free under Apache Licence 2.0.
Free cloud options also exist: SurrealDB gives 1 GB, Couchbase Capella a one-node cluster, and Redis a 30 MB database. All need hosting, operation or a data-model change.
Which alternatives accept MongoDB drivers?
FerretDB (MongoDB 5.0+ wire protocol), Amazon DocumentDB, Azure Cosmos DB with its API for MongoDB, and Firestore Enterprise edition with MongoDB compatibility. Each documents the features it lacks, so compatibility is a matter of degree and must be tested on your workload.
What does the SSPL change in practice?
If you only run MongoDB for your own application, the SSPL asks little. If you offer MongoDB functionality to third parties as a service, section 13 requires publishing the service source code under the same licence.
That is the point where many companies switch engines or buy a commercial licence.
Is Amazon DocumentDB the same as MongoDB?
No. AWS describes it as a service with MongoDB compatibility, not the MongoDB server. Its features page names the driver versions it supports and says a majority of applications, drivers and tools work, which leaves room for gaps.
Can PostgreSQL replace a document database?
For many applications, yes, through the jsonb type, but queries are rewritten in SQL and documents are mapped to tables or JSON columns.
It is the right move when you already need joins or constraints and the least suitable when your code is built on the aggregation pipeline.
Is any alternative based in Europe or Israel?
RavenDB Ltd gives its headquarters as Hadera, Israel, with an office in Toruń, Poland. SurrealDB is listed on this site as UK-based. FerretDB does not state a country in its docs, and the rest of the list is US-headquartered.
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Sources
Checked 31 October 2026
MongoDB pricing: Free, Flex and Dedicated prices, storage and RAM ranges, separate pricing for Search, Vector Search and Stream Processing.
Founder of The Knowledge Engineers and of 2 Steps Ahead, an AI search visibility agency. Editorially responsible for every page on this site; research and drafting are AI-assisted.
Checked and edited by Sebastiaan Smits, last on 31 October 2026. The editorial process explains the method.
