Amazon DocumentDB vs Firestore
Amazon DocumentDB
aws.amazon.com
Firestore
cloud.google.comSide by side
| Figure | Amazon DocumentDB | Firestore |
|---|---|---|
| Price from | — | Free |
| Free plan | — | Yes |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| iOS | — | Yes |
| Android | — | Yes |
| API | Yes | Yes |
| Plans published | 11 | 9 |
| Spec score · Document Databases | 9.0 (#1) | 9.0 (#2) |
| Spec score · NoSQL Databases | 9.0 (#4) | 8.9 (#8) |
| Spec score · Database Software | 8.5 (#28) | 9.2 (#4) |
| Documentation depth | AWS publishes a developer guide, API reference, CLI reference, compatibility tables, quotas, tutorials, migration tools and SDK code examples. | The documentation set includes developer guides, API references, source repositories, issue trackers, Stack Overflow links, samples, and library integrations. |
| Free plan | No | Yes |
| Integrations | DocumentDB integrates with CloudWatch metrics and alarms, AWS Lambda change-stream event sources, IAM, KMS, AWS Backup and OpenSearch zero-ETL pipelines. | The product page names Google AI Studio, remote MCP, LangChain, and LlamaIndex integrations for building generative AI applications. |
| MongoDB compatibility | Engine 8.0 supports MongoDB API drivers for versions 6.0, 7.0 and 8.0, and adds views and collation support. | Firestore provides a MongoDB-compatible API and supports MongoDB client tools such as mongosh, mongoimport, and Compass. |
| Rating on G2 | 4.3 out of 5 from 44 reviews | 4.2 out of 5 from 97 reviews. |
| Rating on Gartner Peer Insights | 4.3 out of 5 from 15 ratings | 4.0 out of 5 from 6 ratings. |
| Rating on TrustRadius | 5.1 out of 10 from 9 reviews | 10 out of 10 for a Firebase review that specifically uses Firestore. |
| Security | AWS documents VPC isolation, KMS encryption at rest, TLS in transit, IAM/RBAC controls, Secrets Manager and FedRAMP High authorization in GovCloud. | Firestore integrates with Cloud IAM, Cloud Identity Platform, and Firebase Authentication for identity-based access controls and data validation. |
| Serverless scaling | Serverless automatically scales database capacity to workload demand and supports Multi-AZ deployments and read replicas. | The service uses pay-per-use serverless infrastructure and automatically scales compute and storage without pre-provisioning. |
| Transactions | Multi-document, multi-collection and multi-database ACID transactions are supported from version 4.0, with a 32 MB log limit and one-minute transaction timeout. | Firestore supports ACID-compliant transactions and atomic batch operations. |
| Vector search | Release notes list HNSW vector indexes and vector search support for DocumentDB 5.0. | Yes |
| What it does | Amazon DocumentDB is a fully managed cloud document database designed to run MongoDB-compatible applications, drivers and tools. | Firestore is a fully managed, scalable JSON document database for mobile, web, and server applications. |
Plans
Amazon DocumentDB
- Serverless — StandardPrice not published
- Serverless — I/O-OptimizedPrice not published
- Provisioned On-Demand — StandardPrice not published
- Provisioned On-Demand — I/O-OptimizedPrice not published
- Amazon DocumentDB free trialFree
- Free trialFree
- Amazon DocumentDB Serverless (Standard)$0.08 a month
- Amazon DocumentDB Serverless (I/O-Optimized)$0.09 a month
- DocumentDB I/O-OptimizedPrice not published
- DocumentDB ServerlessPrice not published
Firestore
- Standard edition — document readsPrice not published
- Standard edition — document writesPrice not published
- Standard edition — document deletesPrice not published
- Standard edition — stored dataPrice not published
- Free quotaFree
- Free quotaFree
- Standard edition pay-as-you-go$0.03 a month
- Enterprise editionPrice not published
- Standard editionPrice not published
In their own words
Amazon DocumentDB
Amazon DocumentDB has no write-up on Specifiction yet; its figures are above.
Firestore
Firestore is a fully managed, serverless document database for building AI, web, and mobile applications. It stores flexible JSON data and supports vector search, full-text search, geospatial queries, and ACID transactions on JSON or BSON-compatible documents. Client SDKs for Android, iOS, and web provide real-time updates and automatic syncing for offline access. Firestore can replicate data across multiple regions with strong consistency; multi-region deployments have a stated 99.999% SLA-backed availability. Integrations named for generative AI application work include Google AI Studio, remote MCP, LangChain, and LlamaIndex. Identity controls connect with Cloud IAM, Cloud Identity Platform, and Firebase Authentication. Data is encrypted before it is written to disk, with customer-managed keys available through Cloud KMS. The free quota applies to one database per project and includes 1 GiB of storage, daily read, write, and delete allowances, and 10 GiB monthly outbound transfer. New customers receive $300 in credits, separate from that quota. Server client libraries bypass Firestore Security Rules, so server access needs IAM controls.