Is MongoDB or QuestDB better?

Neither clearly leads. MongoDB starts at Free and QuestDB at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.

Which is cheaper, MongoDB or QuestDB?

MongoDB starts at Free and QuestDB at Free.

Does MongoDB or QuestDB run on more platforms?

MongoDB runs on Cloud (Atlas), Self-hosted, Multi-cloud (AWS, Google Cloud, Azure). QuestDB runs on Docker, Kubernetes, Cloud (AWS, Azure, GCP).

Can I use MongoDB for free?

Both have a free tier, so you can try either at no cost before committing.

What is MongoDB best used for?

MongoDB is most often used for mobile applications, content management, real-time analytics, iot applications. Of those, mobile applications and content management are not what QuestDB is typically brought in for.

What can MongoDB do that QuestDB cannot?

MongoDB covers Document model, Distributed architecture, ACID transactions, Real-time analytics. QuestDB covers High Throughput Ingestion, SQL Support, Time-series Optimization, SIMD Vectorization.

Technology · head to head

MongoDB vs QuestDB

MongoDB

Technology

The developer data platform

From: Free
Rated: -

Full review Website

QuestDB

Databases

Fast open source time-series database for high throughput ingestion

From: Free
Rated: -

Full review Website

The short version

Each has a real cost: MongoDB 16 MB maximum document size limits large single objects; QuestDB open-source edition lacks high-availability, distributed architecture, and enterprise security features
They diverge on capability: MongoDB covers Document model, QuestDB covers High Throughput Ingestion.
Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which MongoDB and QuestDB actually diverge.

Attributes where MongoDB and QuestDB differ
Attribute	MongoDB	QuestDB
Pricing model	Unknown	open-source
Platforms	Cloud (Atlas), Self-hosted, Multi-cloud (AWS, Google Cloud, Azure)	Docker, Kubernetes, Cloud (AWS, Azure, GCP)
Category	Technology	Databases
Founded	2007	2014

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in MongoDB

Document model
Distributed architecture
ACID transactions
Real-time analytics
Full-text search
Time series data
Geospatial queries
Aggregation framework

Only in QuestDB

High Throughput Ingestion
SQL Support
Time-series Optimization
SIMD Vectorization
Column-oriented Storage
Built-in Web Console
InfluxDB Line Protocol
PostgreSQL

What people use each for

The jobs each tool is most often brought in to do.

MongoDB

Mobile applicationsnot QuestDB
Content managementnot QuestDB
Real-time analyticsnot QuestDB
IoT applicationsnot QuestDB
Gaming backendsnot QuestDB

QuestDB

Time-series analytics ingesting up to 20M rows/second from IoT sensors or financial data feedsnot MongoDB
Real-time dashboarding with 32ms time-to-first-row latency for minute-level analyticsnot MongoDB
Applications requiring multi-tier storage (hot ingest, real-time SQL, cold Parquet archive)not MongoDB

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

MongoDB

16 MB maximum document size limits large single objects
No native JOIN support for relational data operations
Higher memory usage due to storing field names with each document
Eventual consistency in distributed deployments can cause data stale reads

QuestDB

Open-source edition lacks high-availability, distributed architecture, and enterprise security features
Enterprise edition pricing not published; requires contacting sales for custom quote
Ingestion limit of 20M rows/sec platform-dependent; may not scale to extreme throughput requirements

Pricing, plan by plan

MongoDB

Free

M0Free
- 512 MB storage
- Learning and exploration
M2$9/month
- 2 GB storage
- Development and testing
M5$25/month
- 5 GB storage
M10+$56.94/month
- Dedicated clusters for production

QuestDB

Free

No published plan breakdown. See the QuestDB review.

Which should you pick?

Choose MongoDB if

You need document model.
You want to start without paying.
You work on Cloud (Atlas), Self-hosted, Multi-cloud (AWS, Google Cloud, Azure).
You also want distributed architecture.

MongoDB review

Choose QuestDB if

You need high throughput ingestion.
You want to start without paying.
You work on Docker, Kubernetes, Cloud (AWS, Azure, GCP).
You also want sql support.

QuestDB review

Questions people ask

Is MongoDB or QuestDB better?: Neither clearly leads. MongoDB starts at Free and QuestDB at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, MongoDB or QuestDB?: MongoDB starts at Free and QuestDB at Free.
Does MongoDB or QuestDB run on more platforms?: MongoDB runs on Cloud (Atlas), Self-hosted, Multi-cloud (AWS, Google Cloud, Azure). QuestDB runs on Docker, Kubernetes, Cloud (AWS, Azure, GCP).
Can I use MongoDB for free?: Both have a free tier, so you can try either at no cost before committing.
What is MongoDB best used for?: MongoDB is most often used for mobile applications, content management, real-time analytics, iot applications. Of those, mobile applications and content management are not what QuestDB is typically brought in for.
What can MongoDB do that QuestDB cannot?: MongoDB covers Document model, Distributed architecture, ACID transactions, Real-time analytics. QuestDB covers High Throughput Ingestion, SQL Support, Time-series Optimization, SIMD Vectorization.

Answered from the vendors’ own pages

MongoDB: Does MongoDB offer a free tier?

Yes. MongoDB Atlas offers an M0 free tier with 512 MB storage for learning and exploration, plus paid options starting at $9/month for M2 with 2 GB storage.

Source

QuestDB: How much does QuestDB Enterprise cost?

QuestDB does not publish specific pricing for the Enterprise tier. Customers must contact QuestDB via their enterprise contact form to receive a custom quote.

Source

MongoDB: Can I self-host MongoDB?

Yes. You can run MongoDB Community Edition on your own servers, or use MongoDB Enterprise Advanced for self-managed production deployments with enterprise features.

Source

QuestDB: Does QuestDB offer a free version?

Yes, QuestDB Open Source is completely free and recommended for evaluation, prototyping, and pilot projects. Enterprise features, high availability, security, and dedicated support require the paid Enterprise tier.

Source

MongoDB: What is the maximum document size in MongoDB?

Documents are limited to 16 MB. For documents exceeding this limit, you can use MongoDB's GridFS API to store files larger than the maximum size.

Source

QuestDB: What deployment options does QuestDB offer?

QuestDB offers open source deployment, Enterprise deployment, and Bring Your Own Cloud (BYOC) deployment. Pricing details for BYOC and Enterprise tiers are not published and require direct contact with sales.

Source

MongoDB: Does MongoDB support ACID transactions?

Yes. MongoDB supports ACID transactions within a single document by default, and multi-document ACID transactions are available for replica sets and sharded clusters in MongoDB 4.0+.

Source

MongoDB vs QuestDB

MongoDB

QuestDB

The short version

Where they differ

What each one covers

Only in MongoDB

Only in QuestDB

What people use each for

MongoDB

QuestDB

Where each one falls short

MongoDB

QuestDB

Pricing, plan by plan

MongoDB

QuestDB

Which should you pick?

Choose MongoDB if

Choose QuestDB if

Questions people ask

Answered from the vendors’ own pages

Related pages

More on MongoDB

More on QuestDB

Keep looking

Other head to heads