Colora vs Leonardo

Colora is a free Windows color converter and screen picker for selecting and saving colors. The screen picker includes zoom for more precise selection, and the converter handles RGB, HEX, HSB, HSL and CMYK. You can create custom palettes, save them for later and export them to GIMP; an automatic history also retains recently picked colors. Window controls let Colora stay on top of other windows or use a minimal size mode. It requires Windows 7 or newer and .NET Framework 4.6 or higher. The maker says the picker has been tested with Windows 10 and DPI scaling. Downloads are offered through SourceForge, with installation also available through Chocolatey. Colora is published by Bluegrams under the BSD 3-Clause license. SourceForge lists version 0.3.1, dated September 11, 2020, as the latest release.

Leonardo is an open-source tool for creating, managing, and sharing accessible color systems for interface design and data visualization. Users can generate swatches from target contrast ratios or set target lightness, then adjust brightness, contrast, and saturation with adaptive themes. Sequential and diverging scales support data visualization. Accessibility tools can cycle through colorblind-safe palettes and compare color differences across color vision deficiency types, while charts and 3D models help evaluate themes. Themes and scales can be downloaded as SVG, and scales can also be exported as Tableau XML. Developer output includes parameters for @adobe/leonardo-contrast-colors, CSS custom properties, and design tokens. The related JavaScript package generates adaptive contrast-based colors and is installed with npm; its documentation includes vanilla JavaScript and React examples. The site also documents an MCP server for generating themes, checking contrast, converting colors, and creating palettes. The project is licensed under Apache V2 and has a free plan listed at free. One limitation is that generated contrast ratios can be slightly above requested values because RGB colors and color-space interpolation constrain exact results.