Databases · head to head
EMQX vs SQLite
EMQX
Databases
Erlang MQTT broker for large IoT fleets, relicensed to BSL with production free use limited to one node
- From
- Free
- Rated
- -
The short version
- Each has a real cost: EMQX the move to Business Source Licence 1.1 at version 5.9 in May 2025 limits free production use to a single node, so the clustering that justifies choosing EMQX now requires a paid subscription from the second node onward.; SQLite supports only serialized write operations; only one process can modify the database at any moment, limiting concurrent users
- They diverge on capability: EMQX covers Erlang clustering, SQLite covers Serverless Operation.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which EMQX and SQLite actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Databases).
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 EMQX
- Erlang clustering
- MQTT 5.0 and QUIC
- Rule engine
- Data integration sinks
- Session persistence
- Multi protocol gateways
- Authentication and authorisation
- Dashboard and REST API
Only in SQLite
- Serverless Operation
- Zero Configuration
- Single File Database
- Cross-platform
- Full SQL Support
- ACID Compliance
- Self-contained
- Browser Storage
What people use each for
The jobs each tool is most often brought in to do.
EMQX
- A connected vehicle platform needing millions of persistent MQTT sessions with QUIC for handover across mobile networksnot SQLite
- An industrial operator routing sensor telemetry straight into TimescaleDB or Kafka without writing a consumer servicenot SQLite
- An IoT product team that has outgrown a single Mosquitto instance and needs clustering and shared subscriptionsnot SQLite
- A smart building deployment mixing MQTT, CoAP and LwM2M devices on one brokernot SQLite
SQLite
- Transaction processingnot EMQX
- Data storagenot EMQX
- Application backendnot EMQX
- Reportingnot EMQX
- Data analyticsnot EMQX
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
EMQX
- The move to Business Source Licence 1.1 at version 5.9 in May 2025 limits free production use to a single node, so the clustering that justifies choosing EMQX now requires a paid subscription from the second node onward.
- The relicensing arrived in a minor release, which caught users who had pinned to 5.x expecting Apache 2.0 terms and forced legal review of existing deployments.
- Running an Erlang/OTP cluster well requires operational knowledge most teams do not have, and diagnosing distribution, mnesia or memory issues means learning a runtime you use for nothing else.
- Enterprise pricing is quoted rather than published for the self-managed edition, so the cost of the clustered configuration you actually need is invisible until you talk to sales.
- The Serverless tier caps at around a thousand connections and shares infrastructure, which makes it a prototyping tier rather than a genuine small production option.
SQLite
- Supports only serialized write operations; only one process can modify the database at any moment, limiting concurrent users
- No multi-user support or granular access control; relies on file system permissions for security only
- Limited ALTER TABLE functionality cannot edit or modify columns in existing tables
Pricing, plan by plan
EMQX
Free- Open Source single nodeFree
- BSL 1.1 licence since version 5.9
- Free production use of one node only
- All former enterprise features visible
- ServerlessFree
- Free monthly quota then pay as you go
- Up to 1,000 connections
- 8 by 5 support
- Dedicated Flex$234/month
- Single tenant cluster
- Traffic allowance included
- 24/7 support
- Enterprise self-managed$undefined/year
- Deploy on premises, at the edge or in any cloud
- Clustering licensed
- 256 MB maximum message size
SQLite
Free- Public DomainFree
- Serverless
- Zero-configuration
- Cross-platform
Which should you pick?
Choose EMQX if
- You need erlang clustering.
- You want to start without paying.
- You work on Linux, Docker, Kubernetes, Cloud, macOS.
- You also want mqtt 5.0 and quic.
Choose SQLite if
- You need serverless operation.
- You want to start without paying.
- You work on Linux, macOS, Windows, iOS, Android.
- You also want zero configuration.
Questions people ask
- Is EMQX or SQLite better?
- Neither clearly leads. EMQX starts at Free and SQLite at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, EMQX or SQLite?
- EMQX starts at Free and SQLite at Free.
- Does EMQX or SQLite run on more platforms?
- EMQX runs on Linux, Docker, Kubernetes, Cloud, macOS. SQLite runs on Linux, macOS, Windows, iOS, Android.
- Can I use EMQX for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is EMQX best used for?
- EMQX is most often used for a connected vehicle platform needing millions of persistent mqtt sessions with quic for handover across mobile networks, an industrial operator routing sensor telemetry straight into timescaledb or kafka without writing a consumer service, an iot product team that has outgrown a single mosquitto instance and needs clustering and shared subscriptions, a smart building deployment mixing mqtt, coap and lwm2m devices on one broker. Of those, a connected vehicle platform needing millions of persistent mqtt sessions with quic for handover across mobile networks and an industrial operator routing sensor telemetry straight into timescaledb or kafka without writing a consumer service are not what SQLite is typically brought in for.
- What can EMQX do that SQLite cannot?
- EMQX covers Erlang clustering, MQTT 5.0 and QUIC, Rule engine, Data integration sinks. SQLite covers Serverless Operation, Zero Configuration, Single File Database, Cross-platform.
Answered from the vendors’ own pages
EMQX: Is EMQX still open source?
Not in the OSI sense since version 5.9. It is source-available under Business Source Licence 1.1, reverting to Apache 2.0 four years after each release.
SQLite: Is SQLite free and open source?
Yes, SQLite is open source and in the public domain. The complete source code and binaries are free to download and use for any purpose without restrictions.
SourceEMQX: Can I run a free cluster?
No. The additional use grant permits free production use of one node; clustering requires a commercial licence.
SQLite: How does SQLite work and what is its design?
SQLite is a self-contained, serverless SQL database engine that reads and writes directly to disk files. It requires no separate server process and runs within your application, making it ideal for embedded systems and local storage.
SourceEMQX: What changed for existing users?
Community and enterprise editions merged, so all features are now visible, but the licence terms tightened in the same minor release.
SQLite: What are SQLite's limitations for scaling?
SQLite does not support true multi-user concurrency. Only one process can write to the database at a time, and it lacks user management and access control features. It is designed for small to medium projects, not enterprise applications with many concurrent users.
SourceEMQX: Which version is still Apache 2.0?
Releases before 5.9 remain under Apache 2.0, and each BSL release converts to Apache 2.0 four years after publication.
SQLite: Can I use SQLite for production web applications?
SQLite can work for single-server web applications with modest concurrency needs. However, it lacks features like user management, granular security, and sophisticated query optimization needed for large-scale applications.
SourceRelated pages
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