Leonardo vs Pantone Connect Palette Generator

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.

Pantone Connect Palette Generator creates palettes from a mood, theme, or concept using semantic search and Pantone trend research. The beta is available to authenticated Pantone Connect users, including free-account holders, and Pantone says it is built using Microsoft Azure OpenAI. Generated palettes can be saved to Connect, edited, exported into a design workflow, downloaded for creative files or vendor color specifications, and shared with a team.

Pantone Connect provides access to over 15,000 colors and nearest RGB, CMYK, Hex, and L*a*b* equivalents. Basic account holders can save and share up to 10 palettes. Premium includes tools such as color extraction, conversion, color data, harmonies, trending palettes, simulations, and accessibility support. Connect is available on the web, iOS, and Android, with an extension for Adobe Illustrator, InDesign, and Photoshop. Premium is required to use Pantone Libraries in Adobe Creative Cloud apps. Pantone Connect Basic is free with an account. Individual Premium costs $29.99 per month or $89.99 per year; subscriptions automatically renew unless canceled before the next billing date.