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Browser Extensions · head to head

Keeper vs Tampermonkey

Keeper logo

Keeper

Browser Extensions

Protect your passwords and private information

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: Keeper free tier is severely limited to 10 passwords on a single device; essentially a trial rather than a usable free version; 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: Keeper covers Password management, Tampermonkey covers Userscript management.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Keeper and Tampermonkey actually diverge.

Attributes where Keeper and Tampermonkey differ
AttributeKeeperTampermonkey
Pricing modelUnknownopen-source
PlatformsChrome, Firefox, Edge, Safari, Brave, Opera, iOS, Android, macOS, WindowsWeb, Windows, macOS, Linux, Android
Founded20112010

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 Keeper

  • Password management
  • Zero-knowledge encryption
  • Secure file storage
  • BreachWatch

Only in Tampermonkey

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

Both cover

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

What people use each for

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

Keeper

  • Business and enterprise password management with zero-knowledge encryptionnot Tampermonkey
  • Privileged access management for admin and service accountsnot Tampermonkey
  • Secure remote access and privileged session recordingnot Tampermonkey
  • Application secrets management through Secrets Managernot Tampermonkey
  • Government deployments requiring FedRAMP Highnot Tampermonkey

Tampermonkey

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

Where each one falls short

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

Keeper

  • Free tier is severely limited to 10 passwords on a single device; essentially a trial rather than a usable free version
  • Personal plan at $1.79/month is promotional pricing; regular price is higher, making budget comparison difficult

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

Keeper

Free
  • FreeFree
    • 10 passwords max
    • Single device only
    • No sync
  • Personal$1.79/month
    • Unlimited passwords
    • All devices
    • 2FA support
  • Family$3.83/month
    • Up to 5 users
    • Unlimited storage
    • Shared vaults

Tampermonkey

Free

No published plan breakdown. See the Tampermonkey review.

Which should you pick?

Choose Keeper if

  • You need password management.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge, Safari, Brave, Opera, iOS, Android, macOS, Windows.
  • You also want zero-knowledge encryption.
Keeper 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 Keeper or Tampermonkey better?
Neither clearly leads. Keeper 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, Keeper or Tampermonkey?
Keeper starts at Free and Tampermonkey at Free.
Does Keeper or Tampermonkey run on more platforms?
Keeper runs on Chrome, Firefox, Edge, Safari, Brave, Opera, iOS, Android, macOS, Windows. Tampermonkey runs on Web, Windows, macOS, Linux, Android.
Can I use Keeper for free?
Both have a free tier, so you can try either at no cost before committing.
What is Keeper best used for?
Keeper is most often used for business and enterprise password management with zero-knowledge encryption, privileged access management for admin and service accounts, secure remote access and privileged session recording, application secrets management through secrets manager. Of those, business and enterprise password management with zero-knowledge encryption and privileged access management for admin and service accounts are not what Tampermonkey is typically brought in for.
What can Keeper do that Tampermonkey cannot?
Keeper covers Password management, Zero-knowledge encryption, Secure file storage, BreachWatch. 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

Keeper: Is there a free version of Keeper?

Keeper offers a free version with very limited functionality: it stores only 10 passwords on a single mobile device with no cross-device sync. A 30-day free trial provides full access to all features.

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
Keeper: What are Keeper's paid pricing plans?

Keeper Personal starts at $1.79/month (promotional pricing) with annual billing. Keeper Family covers up to 5 users at $3.83/month annually. Both include unlimited password storage, cross-device sync, and 2FA support.

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
Keeper: What browsers and devices does Keeper support?

Keeper has browser extensions for Chrome, Firefox, Edge, Safari, Brave, and Opera. It also offers native apps for iOS, Android, macOS, Windows, and web access.

Source
Keeper: Does Keeper support 2FA and passkeys?

Yes, Keeper stores and autofills FIDO2 passkeys and supports multiple 2FA methods including TOTP, SMS, and WebAuthn. Biometric login (fingerprint/face recognition) is also supported.

Source
Keeper: How secure is Keeper?

Keeper uses zero-knowledge architecture where data is encrypted and decrypted only on your device. Only you can access your vault, and the company cannot see your passwords or data.

Source
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