Color format conversion is one of those tasks that sounds trivial and somehow still manages to interrupt your flow every time you need to do it. A designer hands you a spec in HEX. Your CSS framework wants HSL. Your Figma component uses RGB values. Your iOS colleague needs HSB. The conversion math isn't complicated but doing it manually is error-prone, and opening a browser tab every time you need to switch formats adds up over the course of a day.

A color converter that lives in your Mac's menu bar, opens in a keystroke, and converts between all common color formats at once is the kind of tool that earns its keep quietly. You stop thinking about color conversion as a task and it just becomes a frictionless part of your workflow.

Why Developers Need a Color Converter

The color format fragmentation in modern development is real. CSS uses HEX codes and rgb() / hsl() functions. Design tools like Figma and Sketch default to RGB or HEX but also export HSL. iOS and macOS development uses HSB (hue, saturation, brightness also called HSV). Android and Flutter have their own conventions. If you work across any two of these environments, you will regularly need to convert the same color between formats.

Beyond format differences, there are representation differences. Is your HEX value six characters or three? Does your RGB use 0–255 values or 0–1 floats? Is your HSL represented as degrees/percentages or normalized values? A good color converter handles all of these variants rather than forcing you to do secondary arithmetic on top of the conversion.

What Devly's Color Converter Supports

Devly is a native macOS menu bar app with 50+ developer tools. Its color converter is designed around the workflow of someone who has a color value from one source and needs it in another format immediately.

Color formats Devly converts between
  • HEX both 6-digit (#RRGGBB) and 8-digit (#RRGGBBAA) formats with alpha channel support
  • RGB displayed as rgb(R, G, B) with integer 0–255 values, ready to paste directly into CSS
  • HSL hue in degrees, saturation and lightness as percentages, matching the CSS hsl() function format
  • HSB / HSV hue, saturation, and brightness in the format used by design tools and iOS/macOS development
  • Live color preview a swatch showing the actual color updates in real time as you enter or modify any value
  • Copy any format click to copy the HEX, RGB, or HSL value independently without copying the whole output

The live color swatch is a small but meaningful detail. When you're working with colors, seeing the actual color next to the numbers confirms that your conversion is correct at a glance. It's much harder to accidentally transpose two digits when there's an immediate visual sanity check.

The Workflow Difference

Here's what the before and after looks like in practice. You're implementing a design spec and the brand color is defined as #1A4F8C. Your CSS theme uses HSL variables. Previously, you'd open a browser, navigate to a color converter site, paste the HEX value, find the HSL output among the ads and other clutter, and copy it back to your editor.

With Devly, you press ⌥⌘D to open the menu bar popover, search for the color converter with ⌘K, paste your HEX code, and all four format representations appear instantly. Click to copy the HSL value. Done. The total time is under five seconds, and more importantly, you never left your editor's mental context.

That mental context preservation matters more than the raw time saved. Every time you switch to a browser, open a new tab, and interact with a website, you're paying a cognitive overhead cost. Tools that eliminate that overhead even for small tasks let you stay in the zone longer.

Devly in Your Design and Dev Workflow

The color converter is one of many tools Devly provides for frontend and web developers. In the same menu bar popover, you'll find CSS unit conversion (px to rem, em, vw), a minifier for CSS, HTML, and JavaScript, a placeholder image generator, a data URI converter for embedding images, and a Lorem Ipsum generator. If you work at the intersection of design and code which most frontend developers do these tools compound in usefulness.

The app is designed to be unobtrusive. It lives in your menu bar, appears when you need it via ⌥⌘D or a click, and disappears when you close it. There's no dock icon, no main window to manage, and no learning curve beyond knowing the global hotkey. It follows the macOS design language throughout, which means it looks and behaves exactly as you'd expect from a native app.

Devly is a one-time $4.99 purchase on the Mac App Store, compatible with macOS 13 Ventura and later on Apple Silicon and Intel Macs. No subscription, no account, no data collection.