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Tampermonkey
The most popular userscript manager
As of 30 August 2026, Tampermonkey is free to use. Tampermonkey is the most popular userscript manager for browsers. Softwr lists it under Browser Extensions. Tampermonkey is launched in 2010, available on Web, Windows, macOS, Linux.
Overview
What Tampermonkey does
Tampermonkey is the most popular userscript manager for browsers. It allows you to install and manage userscripts that modify web pages, add features, or automate tasks on websites you visit.
What people use it 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
Related searches
The honest half
Where it falls short
Concrete and checkable, so you can decide whether any of them matter to you. This is the half of a review a vendor will not write about 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
Cross-shopped
What people choose instead of Tampermonkey
Each pairing was judged by two reviewers asking whether a buyer would genuinely weigh the two against each other. The ones that failed were deleted rather than published.
- TampermonkeyvsDark Reader
Dark Reader: Dark mode for every website
- TampermonkeyvsPrivacy Badger
Privacy Badger: Automatically learn to block invisible trackers
- TampermonkeyvsRaindrop.io
Raindrop.io: All-in-one bookmark manager
Capabilities
Features
Userscript management
Script editor
Auto-update
Cloud sync
Chrome support
Available on chrome
Firefox support
Available on firefox
Edge support
Available on edge
Safari support
Available on safari
Opera support
Available on opera
Answered, with sources
Questions people ask
Each answer names the page it came from, so you can check it rather than take our word for it.
How much does Tampermonkey cost?
Tampermonkey is completely free for all versions and across all supported browsers including Chrome, Edge, Safari, Opera, and Firefox.
SourceIs Tampermonkey available on all browsers?
Yes, Tampermonkey is available on Chrome 120 and later, Microsoft Edge, Safari, Opera Next, and Firefox with no cost.
SourceBehind it
Who makes Tampermonkey
- Company
- Tampermonkey
- Based in
- Germany
- Founders
- Jan Biniok
Timeline
Tampermonkey over time
- Launch2016-02-09
Tampermonkey beta released for Firefox
Source
Keep looking
Where to go from Tampermonkey
- Tampermonkey alternativesEvery product people weigh against it
- Tampermonkey pricingPlans, floors and what the tiers exclude
- Tampermonkey badgesWhich rules it meets, and the figure behind each
- All Browser Extensions softwareThe full category
- Best Browser Extensions softwareThe shortlist, and how it was cut
Best Browser Extensions software for
Compare Tampermonkey with
- Stylus
- Raindrop.io
- Dark Reader
- Privacy Badger
- Violentmonkey
- Arc
- AdBlock Plus
- Web Developer
- Evernote Web Clipper
- Keeper
- Momentum
- Night Eye
- React Developer Tools
- Save to Google Drive
- Vimeo Record
- Vue.js Devtools
- Web Developer
Other Browser Extensions software
Softwr does not host reviews and shows no star rating for Tampermonkey, because a rating we did not collect is not ours to publish. What is here is the pricing and platform detail from the vendor’s own pages, limitations we could state concretely, and alternatives a reviewer confirmed people weigh against it. Tell us if any of it is wrong.
More on Tampermonkey
Tampermonkey alternatives
What people switch to, and what they give up
Tampermonkey pricing
Every tier, and where the cost actually lands
Compare Tampermonkey
Put it head to head with anything we hold
Tampermonkey badge
Its rating, and an embed for your own site
Best Browser Extensions software alternatives
Dark mode for every website
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