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Cybersecurity · head to head

HashiCorp Vault vs Eclipse Mosquitto

HashiCorp Vault logo

HashiCorp Vault

Cybersecurity

Manage secrets and protect sensitive data

From
Free
Rated
-
Full reviewWebsite
Eclipse Mosquitto logo

Eclipse Mosquitto

Networking

Small, EPL-licensed MQTT broker that runs on hardware other brokers cannot

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: HashiCorp Vault policies are written in HCL with no graphical user interface for policy management or editing; Eclipse Mosquitto there is no clustering: Mosquitto is a single process, so high availability means building your own failover and accepting session loss on switchover.
  • They diverge on capability: HashiCorp Vault covers Secret storage, Eclipse Mosquitto covers MQTT 5.0 support.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which HashiCorp Vault and Eclipse Mosquitto actually diverge.

Attributes where HashiCorp Vault and Eclipse Mosquitto differ
AttributeHashiCorp VaultEclipse Mosquitto
Pricing modelopen-sourceOpen source, no licence fee
PlatformsLinux, Windows, Mac, ApiLinux, Windows, macOS, Docker
CategoryCybersecurityNetworking
Founded2014Unknown

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 HashiCorp Vault

  • Secret storage
  • Dynamic secrets
  • Encryption as a service
  • Identity-based access
  • Audit logging
  • Leasing and renewal
  • Secret engines
  • Auth methods

Only in Eclipse Mosquitto

  • MQTT 5.0 support
  • Very small footprint
  • Bridging
  • WebSockets listener
  • Command line clients
  • Dynamic security plugin

What people use each for

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

HashiCorp Vault

  • Secrets managementnot Eclipse Mosquitto
  • Database credentialsnot Eclipse Mosquitto
  • API keysnot Eclipse Mosquitto
  • SSH accessnot Eclipse Mosquitto
  • PKI and certificatesnot Eclipse Mosquitto

Eclipse Mosquitto

  • A home or building automation stack where the broker must run on the same small computer as everything elsenot HashiCorp Vault
  • An industrial gateway that buffers local telemetry and bridges selected topics to a cloud brokernot HashiCorp Vault
  • Local development and testing of MQTT clients without provisioning a cloud IoT servicenot HashiCorp Vault
  • An air-gapped deployment where a broker with no licence server and no phone-home behaviour is a requirementnot HashiCorp Vault

Where each one falls short

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

HashiCorp Vault

  • Policies are written in HCL with no graphical user interface for policy management or editing
  • Unsealing requires managing multiple key shares and coordinating a quorum of operators
  • Community Edition lacks enterprise features like namespaces and disaster recovery replication
  • Requires additional monitoring solutions for alerting and observability

Eclipse Mosquitto

  • There is no clustering: Mosquitto is a single process, so high availability means building your own failover and accepting session loss on switchover.
  • Persistence is a local file rather than a replicated store, so a disk failure or an unclean shutdown can lose retained messages and queued QoS traffic.
  • Practical capacity is a few thousand concurrent clients on typical hardware, so a growing device fleet eventually forces a migration to a clustered broker.
  • The Eclipse Public Licence is weak copyleft rather than permissive, which some legal teams treat as a blocker when embedding the broker in a shipped commercial product.
  • There is no commercial support to buy from the project, so production incidents rely on community mailing lists or on paying a third party who happens to know the codebase.

Pricing, plan by plan

HashiCorp Vault

Free
  • Open SourceFree
    • Secrets management
    • Encryption
    • Community support
  • Vault Enterprise$6000/year
    • Replication
    • HSM support
    • Advanced audit

Eclipse Mosquitto

Free
  • Eclipse MosquittoFree
    • Eclipse Public License 2.0 with Eclipse Distribution Licence
    • MQTT 5.0, 3.1.1 and 3.1
    • No client or message limits beyond your hardware

Which should you pick?

Choose HashiCorp Vault if

  • You need secret storage.
  • You want to start without paying.
  • You work on Linux, Windows, Mac, Api.
  • You also want dynamic secrets.
HashiCorp Vault review

Choose Eclipse Mosquitto if

  • You need mqtt 5.0 support.
  • You want to start without paying.
  • You work on Linux, Windows, macOS, Docker.
  • You also want very small footprint.
Eclipse Mosquitto review

Questions people ask

Is HashiCorp Vault or Eclipse Mosquitto better?
Neither clearly leads. HashiCorp Vault starts at Free and Eclipse Mosquitto at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, HashiCorp Vault or Eclipse Mosquitto?
HashiCorp Vault starts at Free and Eclipse Mosquitto at Free.
Does HashiCorp Vault or Eclipse Mosquitto run on more platforms?
HashiCorp Vault runs on Linux, Windows, Mac, Api. Eclipse Mosquitto runs on Linux, Windows, macOS, Docker.
Can I use HashiCorp Vault for free?
Both have a free tier, so you can try either at no cost before committing.
What is HashiCorp Vault best used for?
HashiCorp Vault is most often used for secrets management, database credentials, api keys, ssh access. Of those, secrets management and database credentials are not what Eclipse Mosquitto is typically brought in for.
What can HashiCorp Vault do that Eclipse Mosquitto cannot?
HashiCorp Vault covers Secret storage, Dynamic secrets, Encryption as a service, Identity-based access. Eclipse Mosquitto covers MQTT 5.0 support, Very small footprint, Bridging, WebSockets listener.

Answered from the vendors’ own pages

HashiCorp Vault: Does HashiCorp Vault have a free version?

Yes. The open-source Community Edition is completely free and includes core secrets management, dynamic secrets, and encryption as a service. It is self-hosted with no licensing fees or secret count limits, but lacks enterprise features like namespaces, disaster recovery replication, and Sentinel policies.

Source
Eclipse Mosquitto: Can Mosquitto be clustered?

No. It is a single process. High availability requires an external failover arrangement you build yourself.

HashiCorp Vault: Can I use HashiCorp Vault in production?

The Community Edition is suitable for non-production environments and small teams. For production deployments, organizations typically use HCP Vault Dedicated (managed cloud service starting at approximately 22 USD per month) or Vault Enterprise with custom pricing that includes disaster recovery, performance replication, and 24/7 support.

Source
Eclipse Mosquitto: What licence is it?

Eclipse Public License 2.0 alongside the Eclipse Distribution License, a weak copyleft rather than a permissive licence.

HashiCorp Vault: What are the main integrations available?

Vault integrates with AWS, Azure, Google Cloud, Active Directory, Okta, and 80+ other platforms. It supports dynamic credential generation for cloud providers, database systems, and identity services, enabling centralized secret management across multi-cloud infrastructure.

Source
Eclipse Mosquitto: How many clients can it handle?

A few thousand concurrent connections on ordinary hardware; beyond that, use a clustered broker.

HashiCorp Vault: Does Vault work offline?

Vault requires network connectivity to function as it is a centralized secrets management server. However, it can be deployed on-premises for air-gapped environments, and clients can cache short-lived tokens for temporary offline access once authenticated.

Source
Eclipse Mosquitto: Does it support MQTT 5?

Yes, along with 3.1.1 and 3.1.

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