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Browser Extensions · head to head

Greasemonkey vs Logseq

Greasemonkey logo

Greasemonkey

Browser Extensions

The original userscript manager, for Firefox

From
Free
Rated
-
Full reviewWebsite
Logseq logo

Logseq

Content Creation

Free open-source note-taking with linked thoughts

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.; Logseq aGPL-3.0 licensing requires derivative works to be open-source
  • They diverge on capability: Greasemonkey covers Userscript execution, Logseq covers Markdown-based notes.
  • Prices and features above were last checked on 17 September 2026.

Where they differ

Only the attributes on which Greasemonkey and Logseq actually diverge.

Attributes where Greasemonkey and Logseq differ
AttributeGreasemonkeyLogseq
PlatformsFirefoxmacOS, Linux, Windows, iOS, Android, Web
CategoryBrowser ExtensionsContent Creation
FoundedUnknown2020

Identical on both: starting price (Free), pricing model (open-source), 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 Logseq

  • Markdown-based notes
  • Bidirectional linking
  • Graph visualization
  • Backlinks
  • Tags
  • Daily notes
  • Journaling
  • Search and filtering

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 Logseq
  • Automating a repetitive action on a web applicationnot Logseq
  • Adding a missing feature to a site you do not controlnot Logseq
  • Running userscripts on Firefox for Androidnot Logseq
  • Writing and testing your own scripts in the browsernot Logseq

Logseq

  • Privacy-first knowledge management with local data storagenot Greasemonkey
  • Open-source alternative to proprietary note-taking platformsnot Greasemonkey
  • Markdown and Org-mode file support with PDF annotationnot Greasemonkey
  • Extensible through plugin ecosystem for custom workflowsnot 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.

Logseq

  • AGPL-3.0 licensing requires derivative works to be open-source
  • Mobile apps (iOS and Android) still in alpha/beta development stage
  • Self-hosted with local-first architecture, no built-in cloud sync option
  • No native synchronisation between desktop and mobile versions without setup

Pricing, plan by plan

Greasemonkey

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

Logseq

Free

No published plan breakdown. See the Logseq review.

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 Logseq if

  • You need markdown-based notes.
  • You want to start without paying.
  • You work on macOS, Linux, Windows, iOS, Android, Web.
  • You also want bidirectional linking.
Logseq review

Questions people ask

Is Greasemonkey or Logseq better?
Neither clearly leads. Greasemonkey starts at Free and Logseq at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Greasemonkey or Logseq?
Greasemonkey starts at Free and Logseq at Free.
Does Greasemonkey or Logseq run on more platforms?
Greasemonkey runs on Firefox. Logseq runs on macOS, Linux, Windows, iOS, Android, Web.
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 Logseq is typically brought in for.
What can Greasemonkey do that Logseq cannot?
Greasemonkey covers Userscript execution, Built-in script editor, GM. API, @resource support. Logseq covers Markdown-based notes, Bidirectional linking, Graph visualization, Backlinks.

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
Logseq: How much does Logseq cost?

Logseq is a free, open-source privacy-first knowledge base with no paid tiers or hidden costs. The software is available to download and use at no charge.

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
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
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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