Comparison
Sizzy vs Polypane
Both are desktop browsers for responsive work. Polypane is built around viewports and built-in audits; Sizzy is built around project workspaces, isolated sessions, and debugging in the same window.
Facts checked on 20 October 2026. Feature rows come from each vendor's public docs; pricing comes from each vendor's pricing page.
Short answer
Pick Polypane if accessibility and page-quality audits across many viewports are the centre of your workflow. Pick Sizzy if you want a project-first browser with isolated per-device sessions, a unified console and API client, terminals, and coding agents. Sizzy is $15/month with a 14-day trial; Polypane lists a 14-day trial and an Individual plan from €9/month billed yearly.
What Polypane documents
Polypane describes itself as a browser for responsive and accessible development. Its public product tour documents multiple synced panes, device emulation, live reload, an elements panel, meta previews, screenshot and video capture, accessibility and contrast checks, and Polypane Portal for opening a local preview in other browsers and devices.
What Sizzy documents
Sizzy is a desktop developer browser. Its public feature pages describe project workspaces, synchronized device viewports, one isolated browser session per device, a unified console and REST/GraphQL API client, docked Chromium DevTools, screenshots and screen recording, terminals, and coding agents that use the Claude Code or Codex CLI installed on your machine.
Fit
Where Polypane fits, and where Sizzy fits
Both tools can be useful. The split below is about the shape of the workflow, not a score.
Polypane is the better fit when
- Accessibility, contrast, and page-quality audits are part of the browser rather than a separate DevTools panel.
- Meta and social previews are documented as first-class panels.
- Polypane Portal opens your local preview in other browsers, including on real devices, which helps when Chromium alone is not enough.
- Per-pane devtools panels are designed to be read across many viewports at once.
Sizzy is the better fit when
- Project workspaces restore the repo path, dev server, tabs, and device layout in one click.
- Each device runs in its own isolated session, so you can stay signed in as a different user per viewport.
- A unified console, an API client for REST and GraphQL, and docked Chromium DevTools sit beside the page.
- Terminals, running processes, and coding agents work in the same window as the previews.
- One purchase covers the whole workflow; coding agents use the Claude Code or Codex CLI you already signed in to.
Feature table
Sizzy vs Polypane at a glance
Rows marked "not documented" were not described on the Polypane pages linked below when we checked on 20 October 2026.
| Feature | Sizzy | Polypane |
|---|---|---|
| Several viewports side by side | Yes | Yes |
| Synced scrolling, clicks, and typing | Yes | Yes |
| Emulated device presets | Yes | Yes |
| Saved device layoutSizzy saves the layout with the project workspace. | Yes | Not documented |
| Separate session per device (cookies and storage)Not described in the Polypane pages we checked. | Yes | Not documented |
| Project workspace with repo path, processes, and restored tabs | Yes | Not documented |
| Unified console across devices | Yes | Not documented |
| Element inspector for each viewport | Yes | Yes |
| REST and GraphQL API client | Yes | Not documented |
| Screenshots of every device | Yes | Yes |
| Screen recording | Yes | Yes |
| Integrated terminal | Yes | Not documented |
| Coding agents inside the browserSizzy runs the Claude Code or Codex CLI you already installed. | Yes | Not documented |
| Accessibility auditsSizzy has no dedicated audit panel; Chromium DevTools includes Lighthouse. | Partial | Yes |
| Meta and social previews | No | Yes |
| Open the same preview in another browser or on a phoneSizzy previews are Chromium viewports. Polypane documents this through Polypane Portal. | No | Yes |
| macOS, Windows, and Linux | Yes | Yes |
Legend: Yes means the vendor documents it. Partial means it covers part of the workflow. Not documented means it was not described in the pages below, not that it is necessarily missing.
Pricing
What each one costs
Prices are copied from each vendor's own pricing page on the checked date. Never assume they stay the same.
Sizzy
$15/month, $144/year (about $12/month), or $499 once for lifetime access, with a 14-day free trial and no credit card.
Polypane
Individual plan listed at €12/month billed monthly or €9/month billed yearly (three months free) on 20 October 2026, with a 14-day free trial and no credit card. Business and Enterprise plans are quoted per seat by Polypane.
Questions
Questions about Sizzy and Polypane
On 20 October 2026 Polypane listed its Individual plan at €12/month billed monthly or €9/month billed yearly, with a 14-day free trial and no credit card. Polypane sets its own prices, so check polypane.app/pricing for the current numbers.
No. Polypane documents accessibility and contrast auditing as part of the browser. Sizzy does not ship a dedicated audit panel; you can use the Lighthouse panel in Chromium DevTools while previewing, but it is not the same workflow.
Yes. A common split is Sizzy for project workspaces, isolated sessions, console and API debugging, terminals, and coding agents, and Polypane for its accessibility checks and Polypane Portal previews on other browsers.
Sizzy is $15/month, $144/year (about $12/month), or $499 once for lifetime access. Every plan starts with a 14-day free trial and no credit card.
Sources
Where these facts came from
Checked 20 October 2026. Vendor products change, so confirm on their site before relying on a row.
Keep comparing
The other comparisons
Each page follows the same structure, so you can read the same rows across every vendor.
Overview
All comparison pages
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Sizzy vs Responsively App
Sizzy vs Responsively App, compared from both vendors' public docs on 20 October 2026: device previews, MCP support, sessions, workspaces, and pricing.
Blisk
Sizzy vs Blisk
Sizzy vs Blisk, compared from both vendors' public docs on 20 October 2026: emulated devices, DevTools, sync, sessions, workspaces, pricing, and agents.