Designer Tools

designer.tools

4.6 (

233 ratings

)

Extension Developer Tools 80,000 users

22 support issues

For additional help, check out the developer's support site.

Vera Maxakova

Jan 6, 2026

Doesn't work with iframes

I can only measure items outside of an iframe. Nothing inside the iframe is getting recognized.

Greg Smith

Aug 20, 2025

Login Issue Hangs with the following message: "Logging In Checking Your Credentials"

The tool is exactly what I was looking for, but I have the same issue as Mr. Young, and I tried similar steps. Sent a note to the developer through the Contact form on his page—no response in three days, so I'm trying here.

Mario Young

Aug 8, 2025

I Login stuck with "No window with id" error in service_worker.js

When attempting to log in using the extension, the process gets stuck on the message "Logging in... Checking your credentials."

In the Chrome DevTools console, the following error appears from service_worker.js:

Uncaught (in promise) Error: No window with id: 311884547.
at service_worker.js:1:6973
This seems to indicate that the service worker is attempting to communicate with a window that no longer exists (possibly closed or not created correctly).

Steps to reproduce:

- Install the extension
- Click on the extension icon and try to log in
- Observe that the login is stuck indefinitely
- Check the console for the error message above

I've tried clearing cache, reinstalling the extension, and inspecting the network tab, but the issue persists.

David Cho

Sep 10, 2024

Cancel Order

Hi, I was renewed automatically for designer tools but didn't wish to renew. Could you please cancel and refund my latest order for pro designer tools? thank you.

David Cho

Oct 11, 2023

Receipt

Hi, How do i get a receipt for this paid purchase?

川原千穂

Jun 29, 2023

Is this available for commercial use?

Thanks for creating a great extension! Can you please tell me...
1.Is this available for commercial use?
2.Is this completely free？

I would appreciate it if you could tell me about that.

Dimitrije

Jan 30, 2023

Ruler issue

So when you toggle responsive mode and go mobile, ruler is actually in a way and blocking part of the screen to show the values for example gap between the edge of the screen and element next to it.

Дарья М

Jan 23, 2023

Doesn't run correctly

The extension runs in kind of backgroung mode behind all the content. There are just scales and text "Elevate your design process with Designer Tools PLUS Step up your game Close". Could you fix it please?

Sanjar Afaq

Jan 23, 2023

Error on click, something with chrome.storage.sync

The extension doesn't start when I click it. Clicking the icon, raises an error. Pasted from the console:
```
store.js:1 Uncaught TypeError: Cannot read properties of undefined (reading 'sync')
at Object.setDefault (store.js:1:1997)
at Object.enable (init.js:1:2634)
at Object.toggle (init.js:1:2547)
at bootup.js:1:13
setDefault @ store.js:1
enable @ init.js:1
toggle @ init.js:1
(anonymous) @ bootup.js:1
```

Code where error occurs (from Sources tab)
```
setDefault: function setDefault(a) {
chrome.storage.sync.get(["design", "guides", "grid", "settings", "feedback"], function(b) {
var c = b.design
```
Error tooltip: "Uncaught TypeError: Cannot read properties of undefined (reading 'sync')"

Was working ~4 hrs ago (i.e. ~6:30 am Wednesday, 18 January 2023)

Angelo Sangiorgio

Jan 17, 2023

Plus Version Advantages

Great Extension - what are (or where can I find) the exact advantages of the plus version? Thank you