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Browser Extensions · head to head

Greasemonkey vs Umami

Greasemonkey logo

Greasemonkey

Browser Extensions

The original userscript manager, for Firefox

From
Free
Rated
-
Full reviewWebsite
Umami logo

Umami

Marketing

Open source, cookie-free web analytics you can self-host for the cost of a database

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.; Umami there is no cohort analysis, retention curve, session replay or multi-touch attribution, so a marketing team that needs to justify channel spend will still buy a second tool and Umami becomes a supplementary dashboard.
  • They diverge on capability: Greasemonkey covers Userscript execution, Umami covers Cookie-free tracking.
  • Prices and features above were last checked on 17 September 2026.

Where they differ

Only the attributes on which Greasemonkey and Umami actually diverge.

Attributes where Greasemonkey and Umami differ
AttributeGreasemonkeyUmami
Pricing modelopen-sourcePer month by event count
PlatformsFirefoxWeb, Linux
CategoryBrowser ExtensionsMarketing

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 Umami

  • Cookie-free tracking
  • Self-hosting
  • Small tracking script
  • Custom events
  • Funnels and goals
  • Multi-site and teams
  • Public dashboards
  • API access

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

Umami

  • A developer who wants traffic numbers on a personal or client site without adding a consent bannernot Greasemonkey
  • An organisation whose legal or procurement team has ruled out sending visitor data to a US advertising companynot Greasemonkey
  • A high-traffic site where hosted analytics priced by pageview band has become expensive and self-hosting removes the ceiling entirelynot Greasemonkey
  • A team that wants analytics data in a database they already control so they can query and join it themselvesnot 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.

Umami

  • There is no cohort analysis, retention curve, session replay or multi-touch attribution, so a marketing team that needs to justify channel spend will still buy a second tool and Umami becomes a supplementary dashboard.
  • Self-hosting is only free in licence terms; you own the database, the upgrades, the backups and the query performance at scale, and a busy site's events table grows quickly enough to need real attention.
  • Because it stores no persistent identifier, it cannot follow a user across devices or sessions in any meaningful way, which makes returning-visitor and lifetime-value questions unanswerable by design rather than by omission.
  • Cloud overage is billed per event beyond the plan allowance, so a traffic spike or a badly instrumented custom event can produce a bill materially above the $20 or $200 headline before anyone notices.
  • It is maintained by a small team, so the pace of new capability is modest and enterprise expectations such as SSO, granular role permissions and formal support agreements are limited compared with commercial analytics vendors.

Pricing, plan by plan

Greasemonkey

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

Umami

Free
  • Self-hostedFree
    • MIT licensed, no licence fee
    • No event limit imposed by the software
    • Unlimited websites and users
  • Cloud HobbyFree
    • Up to 100,000 events per month
    • 3 websites
    • 6 months data retention
  • Cloud Pro$20/month
    • Up to 1,000,000 events per month
    • Unlimited websites
    • Unlimited team members
  • Cloud Business$200/month
    • Up to 10,000,000 events per month
    • All Pro features
    • Higher volume overage rate

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 Umami if

  • You need cookie-free tracking.
  • You want to start without paying.
  • You work on Web, Linux.
  • You also want self-hosting.
Umami review

Questions people ask

Is Greasemonkey or Umami better?
Neither clearly leads. Greasemonkey starts at Free and Umami at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Greasemonkey or Umami?
Greasemonkey starts at Free and Umami at Free.
Does Greasemonkey or Umami run on more platforms?
Greasemonkey runs on Firefox. Umami runs on Web, Linux.
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 Umami is typically brought in for.
What can Greasemonkey do that Umami cannot?
Greasemonkey covers Userscript execution, Built-in script editor, GM. API, @resource support. Umami covers Cookie-free tracking, Self-hosting, Small tracking script, Custom events.

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
Umami: Is Umami really free?

Self-hosted, yes; it is MIT licensed with no event cap. You pay for the server and database. Umami Cloud has a free tier at 100,000 events a month and paid tiers from $20.

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
Umami: Do I need a cookie consent banner?

For Umami analytics specifically, generally no, because it sets no cookies and stores no personal data. Other tags on your site may still require one.

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
Umami: Can it replace Google Analytics?

For traffic, referrers and event counts, yes. For attribution modelling, audiences and advertising integration, no.

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
Umami: What does it need to run?

A container and a PostgreSQL or MySQL database. Most people deploy it on infrastructure they already pay for.

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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