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Browser Extensions · head to head

React Developer Tools vs Tampermonkey

React Developer Tools logo

React Developer Tools

Browser Extensions

Debug React applications in your browser

From
Free
Rated
-
Full reviewWebsite
Tampermonkey logo

Tampermonkey

Browser Extensions

The most popular userscript manager

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: React Developer Tools react Developer Tools is only available as a Chrome browser extension. No support for other browsers mentioned.; 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
  • They diverge on capability: React Developer Tools covers Component inspection, Tampermonkey covers Userscript management.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which React Developer Tools and Tampermonkey actually diverge.

Attributes where React Developer Tools and Tampermonkey differ
AttributeReact Developer ToolsTampermonkey
Pricing modelfreeopen-source
PlatformsChrome, Firefox, EdgeWeb, Windows, macOS, Linux, Android
Founded20042010

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 React Developer Tools

  • Component inspection
  • Props/State viewing
  • Performance profiler
  • Hooks debugging

Only in Tampermonkey

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

Both cover

  • Chrome support
  • Firefox support
  • Edge support

What people use each for

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

React Developer Tools

  • Debugging React components during developmentnot Tampermonkey
  • Inspecting component state and propsnot Tampermonkey
  • Performance profiling of React applicationsnot Tampermonkey

Tampermonkey

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

Where each one falls short

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

React Developer Tools

  • React Developer Tools is only available as a Chrome browser extension. No support for other browsers mentioned.

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

Pricing, plan by plan

React Developer Tools

Free
  • FreeFree
    • Component tree
    • Props inspection
    • State tracking

Tampermonkey

Free

No published plan breakdown. See the Tampermonkey review.

Which should you pick?

Choose React Developer Tools if

  • You need component inspection.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge.
  • You also want props/state viewing.
React Developer Tools review

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

Questions people ask

Is React Developer Tools or Tampermonkey better?
Neither clearly leads. React Developer Tools starts at Free and Tampermonkey at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, React Developer Tools or Tampermonkey?
React Developer Tools starts at Free and Tampermonkey at Free.
Does React Developer Tools or Tampermonkey run on more platforms?
React Developer Tools runs on Chrome, Firefox, Edge. Tampermonkey runs on Web, Windows, macOS, Linux, Android.
Can I use React Developer Tools for free?
Both have a free tier, so you can try either at no cost before committing.
What is React Developer Tools best used for?
React Developer Tools is most often used for debugging react components during development, inspecting component state and props, performance profiling of react applications. Of those, debugging react components during development and inspecting component state and props are not what Tampermonkey is typically brought in for.
What can React Developer Tools do that Tampermonkey cannot?
React Developer Tools covers Component inspection, Props/State viewing, Performance profiler, Hooks debugging. Tampermonkey covers Userscript management, Script editor, Auto-update, Cloud sync. Both handle Chrome support, Firefox support, Edge support.

Answered from the vendors’ own pages

React Developer Tools: How much does React Developer Tools cost?

React Developer Tools is completely free. It is a free browser extension with no subscription fees or costs.

Source
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
React Developer Tools: Is React Developer Tools available for download?

Yes. React Developer Tools is available as a free extension on the Chrome Web Store for download at no cost.

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
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