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Browser Extensions · head to head

Tampermonkey vs WhatFont

Tampermonkey logo

Tampermonkey

Browser Extensions

The most popular userscript manager

From
Free
Rated
-
Full reviewWebsite
WhatFont logo

WhatFont

Browser Extensions

Identify fonts on web pages

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Tampermonkey only source code up to version 2.9 is GPLv3; all newer versions are distributed under a proprietary license despite the extension itself being free to use; WhatFont can only detect web-safe fonts and fonts loaded via web font services
  • They diverge on capability: Tampermonkey covers Userscript management, WhatFont covers Font detection.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Tampermonkey and WhatFont actually diverge.

Attributes where Tampermonkey and WhatFont differ
AttributeTampermonkeyWhatFont
Pricing modelopen-sourceUnknown
PlatformsWeb, Windows, macOS, Linux, AndroidChrome, Firefox, Arc
Founded20102011

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Browser Extensions).

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 Tampermonkey

  • Userscript management
  • Script editor
  • Auto-update
  • Cloud sync
  • Opera support

Only in WhatFont

  • Font detection
  • Typography info
  • Service detection
  • Hover inspection

Both cover

  • Chrome support
  • Firefox support
  • Edge support
  • Safari support

What people use each for

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

Tampermonkey

  • Auto-run custom JavaScript to add features to specific websitesnot WhatFont
  • Block ads, remove clutter, or reformat page layout via community/personal userscriptsnot WhatFont
  • Run scripts sourced from Greasy Fork or similar userscript repositoriesnot WhatFont
  • Automate repetitive web tasks such as form-filling or redirect skipping via installed scriptsnot WhatFont

WhatFont

  • Identifying typefaces used on competitor websites for design researchnot Tampermonkey
  • Sourcing font inspiration from high-performing landing pagesnot Tampermonkey
  • Discovering web font services like Google Fonts or Typekit on sitesnot Tampermonkey

Where each one falls short

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

Tampermonkey

  • Only source code up to version 2.9 is GPLv3; all newer versions are distributed under a proprietary license despite the extension itself being free to use
  • Under Manifest V3, GM_webRequest is not (yet) supported
  • Under Manifest V3, GM_xmlhttpRequest fires only one progress event instead of streaming progress, requiring a responseType: 'stream' workaround
  • Since v5.3.2, Chrome/Edge (MV3) requires the user to manually enable Developer Mode, or from Chrome 138+ a per-extension 'Allow User Scripts' toggle, before any userscript will run

WhatFont

  • Can only detect web-safe fonts and fonts loaded via web font services
  • Does not work on images with embedded text or rasterized typography
  • Limited to inspecting single text elements at a time

Pricing, plan by plan

Tampermonkey

Free

No published plan breakdown. See the Tampermonkey review.

WhatFont

Free
  • FreeFree
    • Font inspection on any website
    • Font family identification
    • Font size and weight detection

Which should you pick?

Choose Tampermonkey if

  • You need userscript management.
  • You want to start without paying.
  • You work on Web, Windows, macOS, Linux, Android.
  • You also want script editor.
Tampermonkey review

Choose WhatFont if

  • You need font detection.
  • You want to start without paying.
  • You work on Chrome, Firefox, Arc.
  • You also want typography info.
WhatFont review

Questions people ask

Is Tampermonkey or WhatFont better?
Neither clearly leads. Tampermonkey starts at Free and WhatFont at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Tampermonkey or WhatFont?
Tampermonkey starts at Free and WhatFont at Free.
Does Tampermonkey or WhatFont run on more platforms?
Tampermonkey runs on Web, Windows, macOS, Linux, Android. WhatFont runs on Chrome, Firefox, Arc.
Can I use Tampermonkey for free?
Both have a free tier, so you can try either at no cost before committing.
What is Tampermonkey best used for?
Tampermonkey is most often used for auto-run custom javascript to add features to specific websites, block ads, remove clutter, or reformat page layout via community/personal userscripts, run scripts sourced from greasy fork or similar userscript repositories, automate repetitive web tasks such as form-filling or redirect skipping via installed scripts. Of those, auto-run custom javascript to add features to specific websites and block ads, remove clutter, or reformat page layout via community/personal userscripts are not what WhatFont is typically brought in for.
What can Tampermonkey do that WhatFont cannot?
Tampermonkey covers Userscript management, Script editor, Auto-update, Cloud sync. WhatFont covers Font detection, Typography info, Service detection, Hover inspection. Both handle Chrome support, Firefox support, Edge support, Safari support.

Answered from the vendors’ own pages

Tampermonkey: How much does Tampermonkey cost?

Tampermonkey is completely free for all versions and across all supported browsers including Chrome, Edge, Safari, Opera, and Firefox.

Source
WhatFont: How do I use WhatFont to inspect fonts?

Click the WhatFont icon in your browser toolbar to activate it, then hover over any text on a webpage to see the font name and details in a pop-up. Click the text to reveal additional information like font style, weight, color, and font samples.

Source
Tampermonkey: Is Tampermonkey available on all browsers?

Yes, Tampermonkey is available on Chrome 120 and later, Microsoft Edge, Safari, Opera Next, and Firefox with no cost.

Source
WhatFont: What browsers does WhatFont support?

WhatFont works on Google Chrome, Firefox, and Arc browser. It is available as a free extension in each browser's extension store.

Source
WhatFont: Is WhatFont free?

Yes. WhatFont is a completely free browser extension with no paid tier or premium features. It is maintained as a free tool for designers and developers.

Source
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