Sizzy

Contents

1. 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
2. 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
3. 03What it doesIts main features, where it runs, what it works with and who makes it
4. 04Where it standsIts grades against its category, and whether to keep it or make your own
5. 05The alternativesThe tools it is most often weighed against, side by side
6. 06Quick answersThe questions people ask about it, each answered in a line or two
7. 07About ToolGPAWho made this guide, what else is on the site, and how to cite it

ToolGPA put this guide together from Sizzy’s own pages, its app-store listings and our grades. Every fact in it is on Sizzy’s page too, where it is kept up to date. Checked Nov 13, 2026.

1. 1

   Best for a developer browser with synced device previews

   Sizzy is a Chromium browser for developers with many device previews on one canvas, project workspaces and a debugging panel.

2. 2

   Paid plans start at $12 a month

   As its pricing page puts it: $12 per month, billed annually ($15 billed monthly).

3. 3

   It runs on 3 platforms

   macOS, Windows and Linux.

4. 4

   Devices on one canvas

   Real device sizes and user agents sit side by side, and scrolling, clicks, typing and navigation stay in sync until sync is switched off.

5. 5

   Project workspaces

   Each project keeps its URLs, devices, sessions, notes, snippets and terminals, plus its repo path, dev command and editor.

6. 6

   Isolated sessions

   Cookies, cache and storage are kept separate per session, so you can test as an admin, a customer and a guest at once.

7. 7

   A 1.6 GPA, above 0 of 60

   That is against the other browsers we grade, on value, the free plan, features, ease of use and platforms.

8. 8

   Keep it

   To replace Sizzy you would be making a web browser. That is not a weekend's work, with an AI app builder or without one.

• Monthly

  $15

  per month, billed monthly

  Every feature of Sizzy, billed monthly and cancelable at any time.

• Annual

  $12

  per month, billed annually ($15 billed monthly)

  Every feature, billed $144 once a year; the page says this saves 20% against monthly.

• Lifetime

  $499

  one-time

  One payment, with future updates included and every feature unlocked.

Read from sizzy.co on Nov 13, 2026.

Devices on one canvas

Real device sizes and user agents sit side by side, and scrolling, clicks, typing and navigation stay in sync until sync is switched off.

Project workspaces

Each project keeps its URLs, devices, sessions, notes, snippets and terminals, plus its repo path, dev command and editor.

Isolated sessions

Cookies, cache and storage are kept separate per session, so you can test as an admin, a customer and a guest at once.

Debugging panel

One console for all devices, docked Chromium DevTools, storage and CSS editors, request headers and an API client.

Screenshots and Photo Studio

Capture one device or all of them, full page or framed, and record video or GIF of the canvas.

Terminals and coding agents

Run dev commands and hand tasks to the Claude Code or Codex CLI already on your machine.

Sizzy is made by Kitze.

Sizzy's GPA of 1.6 is higher than 0 of the 60 other browsers we grade, and level with 2.

It stands best on ease of use (C, above 5 of 60) and worst on free plan and trial (F, above 0).

Its paid plans start at $12 a month, against a middle price of $9.50 for the category: 12 of the 19 others that charge start lower.

On features, ease of use and platforms it scores 2.0 out of 4. 31 tools score higher and cost less.

Part 05 · Alternatives

The alternatives

The tools it is most often weighed against, side by side

Polypane, Responsively App and Blisk

The 3 tools Sizzy is most often weighed against, with where each one differs from it.

• 

  2.0GPA

  Polypane

  Free trial · from $9/mo

  Chromium-based browser for web developers, with synced viewports.

  • Sizzy can be bought with a one-time purchase.
  • Sizzy also covers screen recording and screenshots.
  • Polypane also covers site audit.

  Sizzy and Polypane compared in full
• 

  3.0GPA

  Responsively App

  Free

  Free open source browser that shows many device sizes at once.

  • Responsively App has a free plan. Sizzy does not.
  • Sizzy can be bought with a one-time purchase.
  • Responsively App is open source, according to its own site.

  Sizzy and Responsively App compared in full
• 

  2.0GPA

  Blisk

  Free plan · from $11.99/mo

  Developer browser for testing sites on many devices at once.

  • Blisk has a free plan. Sizzy does not.
  • Sizzy can be bought with a one-time purchase.

  Sizzy and Blisk compared in full

The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.

ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.

Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.

• 7,721

  tools graded

• 95

  categories

• 739

  price changes on record

• 579

  apps priced in 12 countries