9 Best Document Databases of 2026

1. 1

   MongoDB Atlas

   MongoDB's managed document database on AWS, Google Cloud and Azure, with search, vector search and change streams built in.

   9.1overall

   MongoDB's managed document database on AWS, Google Cloud and Azure, with search, vector search and change streams built in.

   Best forTeams building apps around JSON documents that want a full query language and a managed service from free to large clusters.

   Adoption data

   70,600+ customersMongoDB reported more than 70,600 customers, including about 75% of the Fortune 100, in its results for the second quarter of fiscal 2027.

   MongoDB, Inc. (SEC filing), MongoDB, Inc. Announces Second Quarter Fiscal 2027 Financial Results (2026): “Millions of developers and more than 70,600 customers across almost every industry—including approximately 75% of the Fortune 100—rely on MongoDB for their most important applications.”

   MongoDB is the database most developers think of when they hear document database, and Atlas is its managed service. A record is a document of field and value pairs, so you can add fields or nest arrays without a schema migration, and documents can reach 16 mebibytes. The query side is broad: indexes on any field, an aggregation pipeline for grouping and joins, change streams, time series, and full-text and vector search on the same cluster. Single-document writes are atomic, and multi-document transactions cover cases that span records. Pricing starts with a free cluster with 512 MB of storage, then Flex clusters bill hourly and land between $8 and $30 a month, and Dedicated clusters start at $0.08 per hour, or $56.94 a month. MongoDB reports more than 70,600 customers, and 19.0% of database respondents in the 2026 Stack Overflow survey worked with it. We compared documented features and published prices.

   Strengths

   • +Largest document size limit in this list at 16 MiB
   • +Free cluster plus Flex clusters capped at $30 per month
   • +Runs on AWS, Google Cloud and Azure

   Limitations

   • −Dedicated clusters start at $56.94 per month
   • −Flex clusters carry some feature limits versus Dedicated
   • −Community Server is source-available rather than open source

   SummaryAtlas is the best default for JSON documents, with the deepest query features and a clear path from free to large clusters. Budget for Dedicated pricing once you leave Flex.

2. 2

   PostgreSQL (JSONB)

   The open-source relational database with a binary JSONB type that stores, indexes and queries JSON documents.

   9.0overall

   The open-source relational database with a binary JSONB type that stores, indexes and queries JSON documents.

   Best forTeams that want JSON documents and relational tables in one free database.

   Adoption data

   57.9%In the 2026 Stack Overflow Developer Survey, 57.9% of respondents to the database question, or 6,984 developers, said they had done extensive work in PostgreSQL; the figure covers all PostgreSQL use, not only JSONB.

   Stack Overflow, 2026 Developer Survey: Databases (2026): “PostgreSQL 6,984 57.9%”

   PostgreSQL is a relational database, but its jsonb type turns any table into a place to keep flexible documents. The docs describe two types: json stores an exact copy of the input text, while jsonb stores a decomposed binary format that is slightly slower to write and much faster to query because nothing is reparsed. On top of jsonb you get containment and existence operators, GIN indexes, subscripting and a jsonpath type for querying deep inside documents. The practical advantage is that documents can sit in the same transaction as orders, users or invoices in normal tables, and you can join them with SQL. The trade-off is that you write SQL operators rather than a document query language, and scaling across many servers takes extensions or a managed service. PostgreSQL is free under its own open-source license, and 57.9% of database respondents in the 2026 Stack Overflow survey worked with it. We compared documented features and published prices.

   Strengths

   • +Free and open source with no license fee
   • +Used by 57.9% of database respondents in the 2026 survey
   • +JSON and relational data share transactions and joins

   Limitations

   • −Not a dedicated document database, so JSON queries use SQL operators
   • −Horizontal sharding needs extensions or a managed service
   • −Self-hosting means you handle backups and upgrades

   SummaryPostgreSQL with JSONB is the best choice when documents live beside relational data and you want one free database. Pick a dedicated document store if most of your data is documents at large scale.

3. 3

   Amazon DynamoDB

   AWS's serverless key-value and document database with on-demand pricing, global tables and ACID transactions.

   8.6overall

   AWS's serverless key-value and document database with on-demand pricing, global tables and ACID transactions.

   Best forServerless apps on AWS with known access patterns and spiky traffic.

   Adoption data

   9.3%In the 2026 Stack Overflow Developer Survey, 9.3% of respondents to the database question, or 1,116 developers, said they had done extensive work in DynamoDB.

   Stack Overflow, 2026 Developer Survey: Databases (2026): “Dynamodb 1,116 9.3%”

   DynamoDB is the default document and key-value store for teams building on AWS Lambda and other serverless services. Tables have no servers to size; in on-demand mode capacity follows traffic and you pay per request unit, and provisioned mode with auto scaling suits steady loads. AWS documents single-digit millisecond reads and writes, server-side ACID transactions, point-in-time backups, global tables with active-active replication and 99.999% availability, and vector search on the same data. The free tier is permanent and covers 25 GB of storage plus 25 write and 25 read capacity units, which AWS says is enough for about 200 million requests a month. The catch is data modeling: DynamoDB is built for key-based access, so you design partition keys and indexes from the queries you expect, and new query patterns can mean new indexes. Per-request USD prices render with scripts on the page we fetched, so the price check is pending. 9.3% of 2026 Stack Overflow database respondents worked with it. We compared documented features and published prices.

   Strengths

   • +No servers to size, patch or manage
   • +Free tier of 25 GB and about 200 million requests a month
   • +99.999% availability for global tables

   Limitations

   • −Data must be modeled around known access patterns
   • −Ad hoc queries across fields are limited compared with MongoDB
   • −Tied to AWS

   SummaryDynamoDB is the best document store for serverless AWS apps with predictable access patterns. Teams that need flexible ad hoc queries should look at MongoDB Atlas first.

4. 4

   Cloud Firestore

   Google's serverless document database for mobile and web apps, organized as documents in collections.

   8.4overall

   Google's serverless document database for mobile and web apps, organized as documents in collections.

   Best forMobile and web developers who want client SDKs, realtime listeners and a daily free quota.

   Adoption data

   4.8%In the 2026 Stack Overflow Developer Survey, 4.8% of respondents to the database question, or 582 developers, said they had done extensive work in Cloud Firestore.

   Stack Overflow, 2026 Developer Survey: Databases (2026): “Cloud Firestore 582 4.8%”

   Cloud Firestore stores JSON-like documents in collections and subcollections, and it is built to be called straight from mobile and web clients through Firebase SDKs, with security rules deciding who can read or write each document. Query listeners push changes to connected devices, and the SDKs cache data so apps keep working offline. Documents can nest maps and arrays up to 20 levels deep, but each document is capped at 1 MiB, so large records need to be split. Billing is per operation: the free quota gives 1 GiB of storage, 50,000 document reads and 20,000 writes per day, one free database per project, and after that the Standard edition costs about $0.03 per 100,000 reads in the region on the pricing page. Queries that use offsets are charged for skipped documents, and listeners bill a read for each changed result. 4.8% of 2026 Stack Overflow database respondents worked with Firestore. We compared documented features and published prices.

   Strengths

   • +Daily free quota with no card needed for small apps
   • +Clients can read and write directly with security rules
   • +No servers or capacity to manage

   Limitations

   • −Documents are capped at 1 MiB
   • −Per-operation billing is hard to forecast for chatty apps
   • −Proprietary to Google Cloud and Firebase

   SummaryFirestore is the best document database for mobile and web apps that talk to the database directly. Keep documents small and model read costs before launch.

5. 5

   Azure Cosmos DB

   Microsoft's globally distributed database for document, key-value, vector, graph and table data, with SDKs and MongoDB-compatible APIs.

   8.2overall

   Microsoft's globally distributed database for document, key-value, vector, graph and table data, with SDKs and MongoDB-compatible APIs.

   Best forAzure teams that need multi-region writes and schema-less JSON with automatic indexing.

   Adoption data

   4.3%In the 2026 Stack Overflow Developer Survey, 4.3% of respondents to the database question, or 513 developers, said they had done extensive work in Cosmos DB.

   Stack Overflow, 2026 Developer Survey: Databases (2026): “Cosmos DB 513 4.3%”

   Azure Cosmos DB is Microsoft's managed database for schema-less JSON items and other models such as key-value, vector, graph and table. Its API for NoSQL stores documents in containers and indexes every property by default, so new fields are queryable without index planning, and the change feed can trigger Azure Functions when data changes. Multi-region distribution is built in, with a 99.999% availability SLA for multi-region accounts. Microsoft also sells MongoDB-compatible options for teams with existing drivers. Items are limited to 2 MB of JSON, and a transactional batch holds up to 100 operations. Capacity is billed in request units, through serverless, standard provisioned or autoscale throughput, which is flexible but takes modeling. The free tier gives 1,000 RU/s and 25 GB each month for the life of one account per subscription. Per-RU prices render with scripts on the page we fetched, so the USD check is pending. 4.3% of 2026 Stack Overflow database respondents worked with Cosmos DB. We compared documented features and published prices.

   Strengths

   • +Lifetime free tier of 1,000 RU/s and 25 GB
   • +Automatic indexing removes most index planning
   • +Deep integration with Azure Functions and other Azure services

   Limitations

   • −Items are capped at 2 MB
   • −Request unit pricing takes time to learn and estimate
   • −Best suited to teams already on Azure

   SummaryCosmos DB is the strongest document database for Azure teams that need global writes. Expect a learning curve on request unit pricing.

6. 6

   Couchbase Capella

   Couchbase's managed JSON database with SQL++ queries, key-value access, search and App Services for mobile sync.

   7.9overall

   Couchbase's managed JSON database with SQL++ queries, key-value access, search and App Services for mobile sync.

   Best forTeams that want SQL-style queries over JSON and offline sync to mobile and edge apps.

   Couchbase Capella stores JSON documents and lets you query them with SQL++, an SQL dialect for nested data, alongside fast key-value reads by document ID. Search covers vector, full-text and geo queries, and App Services syncs data to mobile and edge apps that keep working offline, a feature most databases here leave to the developer. The free tier is a single node with 8 GB that includes SQL, key-value, vector and full-text search and App Services, with no credit card. Paid clusters bill per node per hour: Basic starts at $0.15, about $110 per node per month, Developer Pro at $0.35 and Enterprise at $0.49, with a 99.99% uptime SLA on the two higher tiers for multi-node clusters. Couchbase does not publish a customer count on the pages we checked and is not listed in the 2026 Stack Overflow database question, so its adoption score is conservative. We compared documented features and published prices.

   Strengths

   • +Free tier is a real one-node cluster with 8 GB
   • +SQL++ is familiar to developers who know SQL
   • +Mobile sync is included rather than a separate product

   Limitations

   • −Paid clusters bill per node per hour, so costs step up quickly
   • −Smaller developer community than MongoDB
   • −No public customer count or survey figure for adoption

   SummaryCapella is a good pick when you want SQL-style queries over JSON and built-in mobile sync. Price paid clusters per node before committing.

7. 7

   RavenDB

   An ACID document database with automatic indexes, full-text search, time series and a free Community license.

   7.7overall

   An ACID document database with automatic indexes, full-text search, time series and a free Community license.

   Best for.NET and C# teams that want a transactional document database they can self-host or run in RavenDB Cloud.

   Adoption data

   12,000+ customersRavenDB says on its homepage that it is trusted by more than 12,000 customers worldwide.

   RavenDB, RavenDB homepage (2026): “Trusted by 12,000+ customers across the globe”

   RavenDB is a document database with ACID transactions that has long been popular with .NET teams. Its headline feature is automatic indexing: when a query needs an index, RavenDB creates one and keeps adapting it to changing query patterns, while static indexes are available for heavier work. The feature list also includes full-text, spatial and vector search, document revisions, expiration, attachments, distributed time series and counters, and patching to update documents in one trip to the server. RavenDB says it runs efficiently on resource-constrained hardware and unreliable or offline networks. The Community license is free and eligible for commercial use, with clusters capped at 3 nodes, 3 cores and 6 GB of memory, and it is valid for one year with renewals; a free Developer license covers development, CI and QA. RavenDB Cloud and paid on-premises licenses are sold, but prices did not appear in USD text on the pages we fetched, so the check is pending. RavenDB reports more than 12,000 customers. We compared documented features and published prices.

   Strengths

   • +Community license is free and eligible for commercial use
   • +Auto indexes reduce index tuning work
   • +Runs on resource-constrained hardware and offline networks

   Limitations

   • −Smaller community and fewer hosting options than MongoDB
   • −Community clusters are capped at 3 cores and 6 GB of RAM
   • −Cloud prices did not load in USD text for our check

   SummaryRavenDB suits teams that want transactional documents and minimal index tuning. Check the Community license limits of 3 cores and 6 GB of memory before relying on it in production.

8. 8

   Amazon DocumentDB

   AWS's managed document database that works with MongoDB drivers and tools, with serverless and instance-based capacity.

   7.5overall

   AWS's managed document database that works with MongoDB drivers and tools, with serverless and instance-based capacity.

   Best forAWS teams moving existing MongoDB applications to a managed service inside their AWS account.

   Amazon DocumentDB is a managed document database that accepts MongoDB drivers and tools, so teams already writing MongoDB queries can run them inside AWS. AWS lists compatibility with MongoDB 3.6, 4.0, 5.0 and 8.0 drivers, and DocumentDB 8.0 can take applications from MongoDB 6.0, 7.0 and 8.0. Capacity comes from provisioned instances or DocumentDB Serverless, which scales instantly from 0.5 DCUs; in AWS's published example Serverless on DocumentDB Standard costs $0.0822 per DCU-hour. Storage is replicated across three Availability Zones while you pay for a single copy, from $0.10 per GB-month, and backup storage up to the size of your data is included. New customers get a one-month free trial with 750 hours of a db.t3.medium instance, 30 million IOs and 5 GB of storage. AWS does not publish a usage figure for DocumentDB, so its adoption score is conservative. We compared documented features and published prices.

   Strengths

   • +Existing MongoDB code can often move with driver changes only
   • +Continuous backups with point-in-time restore
   • +You pay for one copy of storage replicated across three AZs

   Limitations

   • −Compatibility covers listed MongoDB versions, not every feature
   • −Free trial lasts one month only
   • −No public adoption figure we could cite

   SummaryDocumentDB fits AWS teams that want MongoDB-style documents without leaving their AWS account. Test your queries against its compatibility list before migrating.

9. 9

   Apache CouchDB

   The open-source JSON document database with an HTTP API and multi-primary replication down to mobile and browsers.

   7.5overall

   The open-source JSON document database with an HTTP API and multi-primary replication down to mobile and browsers.

   Best forDevelopers who want a free, self-hosted JSON store that syncs between servers, phones and browsers.

   Apache CouchDB stores JSON documents and exposes everything over a plain HTTP API, so any language or tool that can send HTTP requests can use it, including proxies and load balancers. Its distinctive feature is the Couch Replication Protocol, which syncs data between server clusters, phones and browsers with multiple primaries, and supports offline-first apps that sync when they reconnect. Reads use Multi-Version Concurrency Control, so clients see a consistent snapshot and are never locked out by concurrent writes, and transactional guarantees apply per document. A cluster adds capacity and high availability without changing the API. CouchDB is free under the Apache License 2.0, and version 3.5.3 shipped on 2026-10-12, so the project is active. You host it yourself or through a third party, which keeps costs low but adds operations work. We found no current survey or vendor figure for CouchDB adoption, so its adoption score is conservative. We compared documented features and published prices.

   Strengths

   • +Free under the Apache License 2.0
   • +Replication is built into the core
   • +Plain HTTP makes it easy to call from any language

   Limitations

   • −No managed service from the project itself
   • −Transactions are per document, not across documents
   • −Smaller community than MongoDB or PostgreSQL

   SummaryCouchDB is the best free option when replication and offline sync matter more than rich queries. Plan to run and back it up yourself.

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