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Browser Extensions · head to head

Redux DevTools vs Stay

Redux DevTools logo

Redux DevTools

Browser Extensions

Debug Redux state changes in your browser

From
Free
Rated
-
Full reviewWebsite
Stay logo

Stay

Browser Extensions

Safari userscript manager that runs Tampermonkey scripts

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Redux DevTools significant performance overhead when tracking large state trees with many action history entries; Stay apple only. No Chrome, Firefox or Edge build, so it cannot serve a cross-browser workflow.
  • They diverge on capability: Redux DevTools covers Action history, Stay covers Tampermonkey and Violentmonkey compatibility.
  • Prices and features above were last checked on 15 September 2026.

Where they differ

Only the attributes on which Redux DevTools and Stay actually diverge.

Attributes where Redux DevTools and Stay differ
AttributeRedux DevToolsStay
Pricing modelopen-sourceone-time
PlatformsChrome, Firefox, Edge, ElectronSafari, iOS, macOS
Founded2015Unknown

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 Redux DevTools

  • Action history
  • State diff
  • Time-travel debugging
  • State export
  • Chrome support
  • Firefox support
  • Edge support

Only in Stay

  • Tampermonkey and Violentmonkey compatibility
  • Userscript management
  • Cross-device bookmark sync
  • Download manager
  • Dark mode
  • One-time purchase across platforms

What people use each for

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

Redux DevTools

  • Redux development and debugging tool for JavaScript applicationsnot Stay
  • Action replay and time-travel debugging for state managementnot Stay

Stay

  • Running Tampermonkey scripts on Safarinot Redux DevTools
  • Running userscripts on iPhone and iPadnot Redux DevTools
  • Syncing bookmarks across Apple and non-Apple devicesnot Redux DevTools
  • Managing downloads into categorised folders on iOSnot Redux DevTools
  • Forcing dark mode on sites that do not offer itnot Redux DevTools

Where each one falls short

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

Redux DevTools

  • Significant performance overhead when tracking large state trees with many action history entries
  • Memory consumption increases with action history, especially with large datasets of 11,000+ records
  • UI becomes sluggish when LogMonitor contains many actions in history
  • Requires manual configuration of maxAge and sanitizers to optimize performance

Stay

  • Apple only. No Chrome, Firefox or Edge build, so it cannot serve a cross-browser workflow.
  • The free tier is deliberately limited, so the practical product is the paid one.
  • Compatibility with Tampermonkey and Violentmonkey scripts is a translation layer rather than the real thing, and a script relying on an unusual GM function may not behave identically.
  • It bundles bookmark sync, downloads and dark mode alongside the script manager, which is more surface area than some people want from an extension with access to every page.
  • A much smaller project than the established managers, so fewer scripts are tested against it.

Pricing, plan by plan

Redux DevTools

Free

No published plan breakdown. See the Redux DevTools review.

Stay

Free
  • FreeFree
    • Limited functionality
  • Lifetime$5/one-time
    • All features
    • iPhone, iPad and Mac
    • Lifetime updates

Which should you pick?

Choose Redux DevTools if

  • You need action history.
  • You want to start without paying.
  • You work on Chrome, Firefox, Edge, Electron.
  • You also want state diff.
Redux DevTools review

Choose Stay if

  • You need tampermonkey and violentmonkey compatibility.
  • You want to start without paying.
  • You work on Safari, iOS, macOS.
  • You also want userscript management.
Stay review

Questions people ask

Is Redux DevTools or Stay better?
Neither clearly leads. Redux DevTools starts at Free and Stay at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Redux DevTools or Stay?
Redux DevTools starts at Free and Stay at Free.
Does Redux DevTools or Stay run on more platforms?
Redux DevTools runs on Chrome, Firefox, Edge, Electron. Stay runs on Safari, iOS, macOS.
Can I use Redux DevTools for free?
Both have a free tier, so you can try either at no cost before committing.
What is Redux DevTools best used for?
Redux DevTools is most often used for redux development and debugging tool for javascript applications, action replay and time-travel debugging for state management. Of those, redux development and debugging tool for javascript applications and action replay and time-travel debugging for state management are not what Stay is typically brought in for.
What can Redux DevTools do that Stay cannot?
Redux DevTools covers Action history, State diff, Time-travel debugging, State export. Stay covers Tampermonkey and Violentmonkey compatibility, Userscript management, Cross-device bookmark sync, Download manager.

Answered from the vendors’ own pages

Redux DevTools: Is Redux DevTools free?

Yes, Redux DevTools is completely free and open-source under the MIT license. It is available as a browser extension for Chrome, Firefox, and Edge, and can also be used as a standalone app or React component.

Source
Stay: Can Stay run Tampermonkey scripts?

Yes. It supports its own native scripts and also scripts written for Tampermonkey and Violentmonkey, which is the main reason to choose it on Safari.

Source
Redux DevTools: What browsers does Redux DevTools support?

Redux DevTools is available as a browser extension for Chrome, Firefox, and Edge. It can also be integrated directly into applications as a React component or standalone app.

Source
Stay: How much does Stay cost?

A one-time payment, reported at around $5, covering iPhone, iPad and Mac with lifetime updates and no subscription. A free version with limited functionality is available.

Source
Redux DevTools: Does Redux DevTools work with production builds?

Redux DevTools is designed for development and should be disabled in production builds. Keeping it enabled in production can impact application performance due to state logging overhead.

Source
Stay: Does Stay work on iPhone?

Yes. It supports Safari across iPhone, iPad and Mac, and the single purchase covers all three.

Source
Redux DevTools: How do I enable time-travel debugging with Redux DevTools?

Redux DevTools allows you to step back through dispatched actions, canceling actions to return to previous application states. This time-travel debugging is built into the core functionality of the extension.

Source
Stay: What can userscripts do in Safari through Stay?

The vendor's examples are automatic pagination, immersive translation, redirect blocking and aggregated search. Anything a userscript can do on another browser is broadly in scope, subject to Safari's own restrictions.

Source
Stay: Is Stay open source?

The project publishes source on GitHub, and the app is distributed through the App Store as a paid product with a limited free tier.

Source
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