Akira is a Linux-focused UI and UX design project whose own repository warns that it is still early-stage. If you are evaluating alternatives, create one realistic interface mockup with reusable components, icons, and multiple screen sizes. Export assets, share the design with a developer, and make a revision after feedback.
Check editability of imported files and whether typography and measurements survive handoff. Also review current maintenance and project-format longevity; future access matters more than an impressive initial screenshot. Choose a tool that the designers and developers can both work with, even if it is less novel.
Akousa