# Polypane alternatives

> Polypane alternatives, checked October 2026: Responsively App, Sizzy, Blisk, Responsive Viewer and Sitepeel’s free responsive checker, with prices and limits.

Canonical page: https://sitepeel.dev/compare/polypane-alternatives/

Polypane is a superb developer browser, at $12 a month. Here are free and cheaper ways to see a site on many screens at once.

Published: 2026-10-27

Facts and prices checked: 2026-10-27

Tool used in this guide: [Responsive viewer](https://sitepeel.dev/free-tools/responsive-checker/index.md)

Free website tool for this task: [Responsive checker](https://sitepeel.dev/free-tools/responsive-checker/index.md) (https://sitepeel.dev/free-tools/responsive-checker/)

## In short

- Free and open source: Responsively App
- No install at all: Sitepeel’s free responsive checker
- Paid once: Sizzy ($499) or Sitepeel’s Chrome extension

## The short list

Polypane costs $12 a month or $108 a year after a 14-day trial, and it’s a desktop app. If you mostly check layouts, something lighter may do.

Polypane alternatives compared

| Tool | Best for | Price | Works in |
| --- | --- | --- | --- |
| Sitepeel | Quick checks from a link | Free web tool; extension paid once | Chrome extension and web |
| Responsively App | Free desktop app | Free, open source | Mac, Windows, Linux |
| Sizzy | A full dev workspace | $15 a month, $144 a year or $499 once | Mac, Windows, Linux |
| Blisk | A ready-made device list | Free 10 minutes a day; $11.99 a month | Mac, Windows, Linux |
| Responsive Viewer | A Chrome extension | Free with ads; Pro $4.99 a month | Chrome |

Good to know: Checked on October 27, 2026 on each product’s own site and store page. “No” means we couldn’t find it there. We make Sitepeel.

## 1. Sitepeel

Paste a link to see the site in real device frames side by side, with a list of layout problems: content wider than the screen, tiny text, small tap targets. The Chrome extension’s Responsive viewer has 60+ devices with synced scrolling.

![Sitepeel responsive checker: linear.app on a monitor, laptop, tablet and phones, with layout problems listed](https://sitepeel.dev/images/compare/sitepeel-responsive.webp)

Sitepeel’s free responsive checker on linear.app.

- No accessibility or emulation suite like Polypane’s

## 2. Responsively App

Responsively shows a site on many devices with mirrored clicks and scrolling. It’s free and open source, and its 2.0 beta lets AI agents drive it.

![Responsively App’s website: “Master the art of crafting responsive web apps”](https://sitepeel.dev/images/compare/responsively-home.webp)

Responsively App’s website on October 27, 2026.

## 3. Sizzy

Sizzy is a developer browser with side-by-side devices, separate sessions per device, terminals and coding agents. It’s the one with a lifetime price.

![Sizzy’s website: “The browser that already knows your project”](https://sitepeel.dev/images/compare/sizzy-home.webp)

Sizzy’s website on October 27, 2026.

## 4. Blisk

Blisk shows phone, tablet and desktop views side by side. The free plan stops after 10 minutes a day, and its last release was in June 2025.

## 5. Responsive Viewer

A Chrome extension that shows many screen sizes on one canvas, with screenshots in device mockups. About 400,000 people use it.

## Which one should you pick?

**Verdict:** For free and powerful, Responsively App. For a one-time price, Sizzy. For a quick check from a link, or inside Chrome, Sitepeel. If you test accessibility and emulation daily, Polypane is worth it.

## Questions and answers

### Is there a free Polypane alternative?

Yes. Responsively App is free and open source. Sitepeel’s responsive checker is free in your browser, with nothing to install.

### How much is Polypane?

After a 14-day trial, Individual is $12 a month or $108 a year, and Business is $16 a seat a month. Prices show in your local currency.

### Polypane or Sizzy?

Polypane leads on accessibility and emulation tests. Sizzy has per-device sessions, terminals and a $499 lifetime option. See also our Polypane vs Responsively page.

## Further reading

- [Polypane: pricing](https://polypane.app/pricing/)
- [Responsively App on GitHub](https://github.com/responsively-org/responsively-app)
- [Sizzy: pricing](https://sizzy.co/pricing)
- [Blisk: pricing](https://app.blisk.io/pricing)
- [Responsive Viewer](https://responsiveviewer.org/)

## Related pages

- [Polypane vs Responsively](https://sitepeel.dev/compare/polypane-vs-responsively/index.md): Polypane vs Responsively App, checked October 2026: devices, testing tools, AI agents, platforms and price. Plus a free way to check screens with no install.
- [Responsive Viewer alternatives](https://sitepeel.dev/compare/responsive-viewer-alternatives/index.md): Responsive Viewer alternatives, checked October 2026: Sitepeel, Responsively App, Window Resizer, Polypane and DevTools. Free and paid ways to test screens.
- [Check a site on every screen size](https://sitepeel.dev/guides/check-website-on-every-screen-size/index.md): See a website on phones, tablets, laptops and monitors side by side, free. Find overflow, tiny text and small tap targets, then test real devices.