Dev Toolkit — 440+ Developer Tools

Name: Dev Toolkit — 440+ Developer Tools
Author: yurukusa

By: yurukusa

Instant access to 440+ free developer tools. JSON, CSS, regex, color, font, API, and more. No tracking, no ads.

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Features & Capabilities

Dev Toolkit gives you instant access to 440+ free browser-based developer tools, right from your browser toolbar.

FEATURES:

440+ tools across 8 categories: Code, Design, Writing, Data, AI, Media, DevOps, Security
Instant search — find any tool in milliseconds
Favorites — star your most-used tools for quick access
Recent tools — automatically tracks what you've used
Category filters — browse by type
Zero data collection — only uses storage for your favorites
No tracking, no ads, no network requests

POPULAR TOOLS INCLUDED:

JSON Format, JSON Diff, JSON Schema
Regex Tester, Base64 Encoder, URL Encoder
Color Palette, Color Contrast Checker
CSS Grid, Flexbox, Animation generators
Image Resize, SVG Optimizer, QR Code
API Tester, HTTP Status Reference
Markdown Editor, Word Counter
And 400+ more...

Every tool is a single HTML file that runs entirely in your browser. No server, no signup, no data leaves your machine.

Open source: https://github.com/yurukusa/dev-toolkit

User Growth & Download Statistics

Add-on

By:

yurukusa

Daily users:

1 -1

Version:

1.0.0 Last updated: 2026-03-16

Version code:

6180326

Creation date:

2026-03-13

Risk:

Permissions:

storage

Size:

43.32KB

Full description:

Source:

Firefox Add-ons Store

Data ingested on:

2026-06-14

Compare stats and ranking:

Ranking

# 121,148 ▼ 55,753

Other rankings

#58 in developer tools keyword 60 ▼ 11#121 in developer keyword 68 ▼ 24

For Developers

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Contact the developer

Chrome-Stats does not own this Firefox add-on. Please use these information below to contact the Firefox add-on developer.

Developed by:

yurukusa

Firefox Add-ons Store

https://addons.mozilla.org/firefox/addon/dev-toolkit-440-devtools/

Is Dev Toolkit — 440+ Developer Tools Safe?

Risk impact

Risk impact measures the level of extra permissions an extension has access to. A low risk impact extension cannot do much harms, whereas a high risk impact extension can do a lot of damage like stealing your password, bypassing your security settings, and accessing your personal data. High risk impact extensions are not necessarily malicious. However, if they do turn malicious, they can be very harmful.

Dev Toolkit — 440+ Developer Tools does not require any sensitive permissions.

Risk impact analysis details

Risk likelihood

Risk likelihood measures the probability that a Firefox add-on may turn malicious. This is determined by the publisher and the Firefox add-on reputation on Firefox Add-ons Store, the amount of time the Firefox add-on has been around, and other signals about the Firefox add-on. Our algorithms are not perfect, and are subject to change as we discover new ways to detect malicious extensions. We recommend that you always exercise caution when installing a Firefox add-on.

Dev Toolkit — 440+ Developer Tools may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.

Risk likelihood analysis details

High This extension has low user count. Unpopular extensions may not be stable or safe.
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