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Browser Extensions · head to head

Keeper vs Stylus

Keeper logo

Keeper

Browser Extensions

Protect your passwords and private information

From
Free
Rated
-
Full reviewWebsite
Stylus logo

Stylus

Browser Extensions

Restyle the web with custom CSS

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; Stylus crashes and instability when applying certain styles
  • They diverge on capability: Keeper covers Password management, Stylus covers Custom CSS injection.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Keeper and Stylus actually diverge.

Attributes where Keeper and Stylus differ
AttributeKeeperStylus
Pricing modelUnknownfree
PlatformsChrome, Firefox, Edge, Safari, Brave, Opera, iOS, Android, macOS, WindowsChrome, Firefox, Edge, Opera
Founded20112017

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
  • Safari support

Only in Stylus

  • Custom CSS injection
  • Style management
  • userstyles.world integration
  • Built-in editor

Both cover

  • Chrome support
  • Firefox support
  • Edge 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 Stylus
  • Privileged access management for admin and service accountsnot Stylus
  • Secure remote access and privileged session recordingnot Stylus
  • Application secrets management through Secrets Managernot Stylus
  • Government deployments requiring FedRAMP Highnot Stylus

Stylus

  • Customizing website appearance with community-created CSS themesnot Keeper
  • Writing personal style overrides for specific websitesnot Keeper
  • Managing multiple styles across different websites automaticallynot Keeper
  • Searching and installing user-styles for current websitesnot Keeper
  • Migrating style collections from Stylish extensionnot 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

Stylus

  • Crashes and instability when applying certain styles
  • No visual element selector tool for identifying page elements to style
  • Security risk if downloading and applying untrusted user-created styles

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

Stylus

Free
  • FreeFree
    • Custom CSS
    • Style library
    • Style editor

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 Stylus if

  • You need custom css injection.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge, Opera.
  • You also want style management.
Stylus review

Questions people ask

Is Keeper or Stylus better?
Neither clearly leads. Keeper starts at Free and Stylus at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Keeper or Stylus?
Keeper starts at Free and Stylus at Free.
Does Keeper or Stylus run on more platforms?
Keeper runs on Chrome, Firefox, Edge, Safari, Brave, Opera, iOS, Android, macOS, Windows. Stylus runs on Chrome, Firefox, Edge, Opera.
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 Stylus is typically brought in for.
What can Keeper do that Stylus cannot?
Keeper covers Password management, Zero-knowledge encryption, Secure file storage, BreachWatch. Stylus covers Custom CSS injection, Style management, userstyles.world integration, Built-in editor. Both handle Chrome support, Firefox support, Edge support, Opera 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
Stylus: Is Stylus free?

Yes. Stylus is completely free and open-source, available for Chrome, Firefox, Edge, and Opera browsers.

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
Stylus: Can I use Stylus to change the browser UI?

No. Due to WebExtensions security restrictions, Stylus can only customize website pages, not the browser interface itself.

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
Stylus: What CSS pre-processors does Stylus support?

Stylus supports CSS, LESS, and Stylus syntax with built-in linting using Stylelint and CSSLint-mod with customizable rules.

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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