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The short list
Sizzy’s pricing page shows no free plan or trial, and every plan has every feature. People look elsewhere to try something first, to pay less, or because they only check layouts now and then.
| Tool | Best for | Price | Works in |
|---|---|---|---|
| Responsively App | Free desktop app | Free, open source | Mac, Windows, Linux |
| Polypane | In-depth testing | 14-day trial; $12 a month or $108 a year | Mac, Windows, Linux |
| Blisk | A ready-made device list | Free 10 minutes a day; $11.99 a month | Mac, Windows, Linux |
| Sitepeel | A quick check from a link | Free web tool; extension paid once | Chrome extension and web |
| Sizzy | A full dev workspace | $15 a month, $144 a year or $499 once | Mac, Windows, Linux |
1. Responsively App
A free, open source desktop browser that shows a site on many devices with mirrored clicks and scrolling, and screenshots of every device. Stable version 1.18.0 is from February 2026, and 2.0 is in beta.
2. Polypane
A paid browser with synced viewports and built-in accessibility and site-quality tests. It can test localhost on other devices. Polypane 31 came out on September 29, 2026.
3. Blisk
Blisk shows phone, tablet and desktop views side by side, from a list of about 100 devices. After 10 free minutes a day its device tools switch off. Its latest release is from June 14, 2025.
4. Sitepeel
Paste a link to see the site in real device frames side by side, with a list of layout problems. The Chrome extension’s Responsive viewer works on pages behind a login. It’s a checker, not a browser.
When Sizzy is the better pick
- You test signed-in states side by side, with a separate session per device
- You want terminals, agents, screenshots and recording around the browser
- You want a one-time price: $499, with future updates
- You like frequent releases: Sizzy 75.6 came out on October 20, 2026
Which one should you pick?
Questions
Is Sizzy free?
No free plan or trial is shown on its pricing page. It costs $15 a month, $144 a year or $499 once, and every plan has every feature.
Is Blisk free?
For 10 minutes a day, with no card. After that its devices, scroll sync, screenshots and inspector switch off until the next day. Premium is $11.99 a month or $117.98 a year.
What is the best free Sizzy alternative?
Responsively App is free and open source on Mac, Windows and Linux. Sitepeel’s responsive checker is free in your browser, with nothing to install.
Sizzy or Polypane?
Sizzy leads on separate sessions per device, terminals and a lifetime price. Polypane leads on accessibility and site-quality tests, and has a 14-day trial.
