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Browser Extensions · head to head

Greasemonkey vs Infisical

Greasemonkey logo

Greasemonkey

Browser Extensions

The original userscript manager, for Firefox

From
Free
Rated
-
Full reviewWebsite
Infisical logo

Infisical

Cybersecurity

Security infrastructure for developers and AI agents

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Greasemonkey firefox only. There is no Chrome, Edge or Safari build and there never has been.; Infisical free tier limited to 5 identities, suitable only for small teams or evaluation
  • They diverge on capability: Greasemonkey covers Userscript execution, Infisical covers Secrets management.
  • Prices and features above were last checked on 17 September 2026.

Where they differ

Only the attributes on which Greasemonkey and Infisical actually diverge.

Attributes where Greasemonkey and Infisical differ
AttributeGreasemonkeyInfisical
Pricing modelopen-sourceUnknown
PlatformsFirefoxWeb, CLI, Cloud, Self-Hosted
CategoryBrowser ExtensionsCybersecurity

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 Greasemonkey

  • Userscript execution
  • Built-in script editor
  • GM. API
  • @resource support
  • Script localisation
  • Firefox for Android

Only in Infisical

  • Secrets management
  • Certificate management
  • Privileged access management
  • Secret versioning
  • Dynamic secrets
  • SAML SSO
  • Open-source core
  • Secrets scanning

What people use each for

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

Greasemonkey

  • Restyling or de-cluttering a site you use dailynot Infisical
  • Automating a repetitive action on a web applicationnot Infisical
  • Adding a missing feature to a site you do not controlnot Infisical
  • Running userscripts on Firefox for Androidnot Infisical
  • Writing and testing your own scripts in the browsernot Infisical

Infisical

  • Managing secrets across Kubernetes clustersnot Greasemonkey
  • Automating certificate lifecycle for internal PKInot Greasemonkey
  • Providing privileged database access with audit trailsnot Greasemonkey
  • Securing credentials for AI agents at runtimenot Greasemonkey

Where each one falls short

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

Greasemonkey

  • Firefox only. There is no Chrome, Edge or Safari build and there never has been.
  • Its API diverged from the Tampermonkey conventions most shared scripts are written against, so a script from a sharing site may need adjusting to run.
  • The dashboard is plainer than Tampermonkey's, with no diff view when a script updates itself.
  • No cloud sync of the kind Tampermonkey and Violentmonkey offer; moving machines means exporting.
  • A userscript manager can read and rewrite every page you visit, so the security of the arrangement depends entirely on the scripts you choose to install.

Infisical

  • Free tier limited to 5 identities, suitable only for small teams or evaluation
  • Pricing tiers are per-identity, which scales costs with team size
  • Certificate management requires Enterprise plan for advanced features like wildcards
  • Privileged access tier is separate billing from secrets management

Pricing, plan by plan

Greasemonkey

Free
  • Open sourceFree
    • Unlimited scripts
    • Built-in editor
    • No account required

Infisical

Free
  • FreeFree
    • 5 identities
    • Unlimited projects
    • 3 environments
  • Pro - Secrets$20/month
    • Per-identity pricing
    • Unlimited identities
    • SAML SSO
  • Pro - Secrets (Annual)$20/year
    • Annual discount available
    • Unlimited identities
    • SAML SSO
  • Advanced - Secrets$40/month
    • Per-identity pricing
    • Dynamic secrets
    • Gateways

Which should you pick?

Choose Greasemonkey if

  • You need userscript execution.
  • You want to start without paying.
  • You work on Firefox.
  • You also want built-in script editor.
Greasemonkey review

Choose Infisical if

  • You need secrets management.
  • You want to start without paying.
  • You work on Web, CLI, Cloud, Self-Hosted.
  • You also want certificate management.
Infisical review

Questions people ask

Is Greasemonkey or Infisical better?
Neither clearly leads. Greasemonkey starts at Free and Infisical at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Greasemonkey or Infisical?
Greasemonkey starts at Free and Infisical at Free.
Does Greasemonkey or Infisical run on more platforms?
Greasemonkey runs on Firefox. Infisical runs on Web, CLI, Cloud, Self-Hosted.
Can I use Greasemonkey for free?
Both have a free tier, so you can try either at no cost before committing.
What is Greasemonkey best used for?
Greasemonkey is most often used for restyling or de-cluttering a site you use daily, automating a repetitive action on a web application, adding a missing feature to a site you do not control, running userscripts on firefox for android. Of those, restyling or de-cluttering a site you use daily and automating a repetitive action on a web application are not what Infisical is typically brought in for.
What can Greasemonkey do that Infisical cannot?
Greasemonkey covers Userscript execution, Built-in script editor, GM. API, @resource support. Infisical covers Secrets management, Certificate management, Privileged access management, Secret versioning.

Answered from the vendors’ own pages

Greasemonkey: Is Greasemonkey still maintained?

Yes. Version 4.14 was released on 2 June 2026, and the project has an active repository, bug tracker and discussion groups.

Source
Infisical: How is pricing calculated for Secrets Management?

Pricing is per-identity per month. Free tier includes 5 identities. Pro tier is $20/identity/month, Advanced is $40/identity/month. All pricing in USD.

Source
Greasemonkey: Does Greasemonkey work on Chrome?

No. It is a Firefox extension and has never shipped for Chrome. Violentmonkey and Tampermonkey are the equivalents there.

Source
Infisical: Can I self-host Infisical?

Yes, Infisical's core is open-source under the MIT license and can be self-hosted. The managed cloud service is also available with additional features.

Source
Greasemonkey: Will Tampermonkey scripts run in Greasemonkey?

Often, but not always. Greasemonkey's API diverged from the conventions most shared scripts are written against, so a script may need its header or its GM calls adjusted.

Source
Infisical: What is included in the Enterprise plan?

Enterprise plan includes SCIM, LDAP, approval workflows, external KMS/HSM support, and 99.99% SLA. Pricing is custom and determined by annual commitment.

Source
Greasemonkey: Does Greasemonkey run on mobile?

On Firefox for Android, from version 4.12. There is no iOS build, because Firefox on iOS cannot load extensions of this kind.

Source
Greasemonkey: What is the GM API?

The set of functions a userscript manager exposes to scripts, named after Greasemonkey, which defined it. Greasemonkey supports the promise-based GM. form including GM.xmlHttpRequest and GM.registerMenuCommand.

Source
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