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Browser Extensions · head to head

Capital One Shopping vs Tampermonkey

Capital One Shopping logo

Capital One Shopping

Browser Extensions

Automatically save while you shop

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: Capital One Shopping limited to coupon and price comparison features, no true cashback rewards; 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: Capital One Shopping covers Price comparison, Tampermonkey covers Userscript management.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Capital One Shopping and Tampermonkey actually diverge.

Attributes where Capital One Shopping and Tampermonkey differ
AttributeCapital One ShoppingTampermonkey
Pricing modelUnknownopen-source
PlatformsWeb, iOS, AndroidWeb, Windows, macOS, Linux, Android
Founded20142010

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 Capital One Shopping

  • Price comparison
  • Coupon finder
  • Price tracking
  • Credits rewards

Only in Tampermonkey

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

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.

Capital One Shopping

  • Automatically applying coupon codes at checkoutnot Tampermonkey
  • Tracking price drops on itemsnot Tampermonkey
  • Earning category-based cashback on purchasesnot Tampermonkey

Tampermonkey

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

Where each one falls short

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

Capital One Shopping

  • Limited to coupon and price comparison features, no true cashback rewards
  • Dependent on retailers offering coupons or price matching
  • Browser extension adds processing overhead to shopping sessions

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

Capital One Shopping

Free

No published plan breakdown. See the Capital One Shopping review.

Tampermonkey

Free

No published plan breakdown. See the Tampermonkey review.

Which should you pick?

Choose Capital One Shopping if

  • You need price comparison.
  • You want to start without paying.
  • You work on Web, iOS, Android.
  • You also want coupon finder.
Capital One Shopping 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 Capital One Shopping or Tampermonkey better?
Neither clearly leads. Capital One Shopping 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, Capital One Shopping or Tampermonkey?
Capital One Shopping starts at Free and Tampermonkey at Free.
Does Capital One Shopping or Tampermonkey run on more platforms?
Capital One Shopping runs on Web, iOS, Android. Tampermonkey runs on Web, Windows, macOS, Linux, Android.
Can I use Capital One Shopping for free?
Both have a free tier, so you can try either at no cost before committing.
What is Capital One Shopping best used for?
Capital One Shopping is most often used for automatically applying coupon codes at checkout, tracking price drops on items, earning category-based cashback on purchases. Of those, automatically applying coupon codes at checkout and tracking price drops on items are not what Tampermonkey is typically brought in for.
What can Capital One Shopping do that Tampermonkey cannot?
Capital One Shopping covers Price comparison, Coupon finder, Price tracking, Credits rewards. Tampermonkey covers Userscript management, Script editor, Auto-update, Cloud sync. Both handle Chrome support, Firefox support, Edge support, Safari support.

Answered from the vendors’ own pages

Capital One Shopping: Is Capital One Shopping free?

Yes. Capital One Shopping is 100% free to install and use on desktop or mobile. There are no fees or charges.

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
Capital One Shopping: Does Capital One Shopping require a Capital One account?

No. Capital One Shopping is free for everyone, including people who are not Capital One customers.

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
Capital One Shopping: What platforms does Capital One Shopping support?

Capital One Shopping is available as a browser extension for desktop browsers and as a mobile app for iOS and Android.

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