The free PerfectPixel alternative
PerfectPixel has been the default pixel perfect Chrome extension for years, and it's still a good one. The free plan gives you 2 layers per domain, with ads. Unlimited layers, folders and the dark theme are part of Pro, at $25 a year. If that's fine by you, stay put. Mockpup is for people who want the same overlay workflow with no layer cap and nothing to pay.
Last checked: 30 September 2026
What PerfectPixel does well
Its site says it has been around since 2012 and is used by 350,000+ developers, and it has the Chrome Web Store's Featured badge. It is available for Chrome, Edge and Firefox today. Since version 3.2 (September 2026) it can move its panel into the browser's side panel, which keeps the viewport clear in DevTools device mode, and that's free for everyone. Mockpup is new, Chrome-only, and doesn't have that kind of track record yet.
Here's where they actually differ.
Mockpup and PerfectPixel, side by side
Everything in the PerfectPixel column comes from its public pages (linked below). Not stated means I couldn't find it documented, not that it's missing.
| Feature | PerfectPixel | Mockpup |
|---|---|---|
| Price | Free ($0). Pro $25 per year. Team $36 per seat per year (2 seats minimum). Enterprise on request. | Free. |
| Layers on the free plan | 2 per domain. Unlimited on Pro. | Unlimited. |
| Folders | Pro. | Free. |
| Dark theme, accent colour | Pro. | Free. |
| Ads | The free edition is ad-supported. Its privacy policy says ads are not personalised, and Pro removes them. | None. |
| Account required | Not stated for the free plan. The terms say that "to access certain features, you may need to create an account". | No. |
| Usage statistics | An optional "Send anonymous statistics" setting (Google Analytics). Opt-in in the EU, EEA and UK, on by default elsewhere, per its privacy policy. | None. |
| Figma paste | Pasting an image from the clipboard: yes, so Figma's Copy as PNG works. Direct import of a copied Figma frame: not stated. | Paste a frame copied in Figma at its exact size (optional personal access token; Figma's API quota applies). Copy as PNG also works, with no token. |
| Diff / compare mode | Yes: Difference blend mode, plus Invert, Multiply and Overlay. | Yes: diff mode (Alt+C), plus Difference, Multiply, Overlay and Invert blend modes. |
| Wipe slider | Not stated. | Yes. |
| Loupe and eyedropper | Not stated. | Loupe up to ×10; eyedropper copies the hex code. |
| Match analyzer | Not stated. | Match score, heatmap and the three biggest problem zones. |
| Side panel for DevTools device mode | Yes, free (since 3.2). | No. The panel floats over the page and can be moved or collapsed. |
| Layer rotation | Pro. | No. |
| Browsers | Chrome, Edge and Firefox. | Chrome, and other Chromium browsers through the Chrome Web Store (listing not live yet). Firefox planned. |
Moving your mockups over
There's no importer for PerfectPixel's saved layers. Your mockups are plain image files, though, so you just add them again.
- Add Mockpup to Chrome and open the page you're building, on localhost, staging or production.
- Press Alt+P to open the panel.
- Drop in your mockups. Use the same PNG, JPG or SVG files, paste from the clipboard, load from a URL, or paste a frame copied in Figma. If you have a few breakpoints, folders keep them apart.
- Same nudge keys. Arrow keys move 1px and Shift+arrow 10px, as in PerfectPixel. Alt+H hides the layer, Alt+C turns on diff mode, and ? lists the rest.
You can keep both installed. Just turn one off while you use the other, so you don't get two panels on the same page.
If your overlay comes in twice as big, or you're not sure which Figma frame to export, see how to compare a Figma design with your live website.
Free, with no layer limit
No account needed, and your mockups stay in your browser.
Add to ChromeNot on the Chrome Web Store yet. Get one email on launch day.
FAQ
Is PerfectPixel still free?
Yes. Its pricing page lists a Free plan at $0 with 2 layers per domain, supported by ads. Pro costs $25 a year and adds unlimited layers, folders, layer rotation and the dark theme, without ads.
Can I import my PerfectPixel layers into Mockpup?
Not directly. Add the same image files again by dropping, pasting or loading them from a URL. Once they're in Mockpup, you can export the whole setup as one JSON file and import it on another machine.
Is Mockpup really free?
Yes. Unlimited layers and folders, with no ads and no account to create. There's no Mockpup server, so your layers stay in your browser and nothing is sent to me.
Does Mockpup work in Edge or Firefox?
Edge, Brave, Arc and Opera can install extensions from the Chrome Web Store, so Mockpup should run there too, though I test it in Chrome. Firefox is planned. Until then, if you work in Firefox, PerfectPixel has a version for it.
What does PerfectPixel do that Mockpup doesn't?
It can dock in the browser's side panel, which helps in DevTools device mode. It rotates layers (on Pro). It runs in Edge and Firefox. And it has been around since 2012.
Sources
Everything in the PerfectPixel column comes from these public pages, read on 30 September 2026:
- PerfectPixel pricing: plans, prices, layer limits, ads, folders, rotation, dark theme.
- PerfectPixel product page: features, browsers, "since 2012", "350,000+ developers".
- PerfectPixel on the Chrome Web Store: version 3.2.0.2 (updated 28 September 2026), feature list, Featured badge.
- PerfectPixel privacy policy (last updated 28 September 2026): ads, sign-in, usage statistics.
- PerfectPixel terms (last updated 24 May 2026): accounts, annual billing.
- PerfectPixel blog: side-panel mode in 3.2 (9 September 2026).
Spotted something out of date? Tell me at hello@mockpup.com and I'll fix it.
PerfectPixel is a trademark of its owner; Mockpup is not affiliated. The name is used only to identify the product being compared.