Tested for you. Ready to use.
A hundred tabs open and still not sure what's worth using? mayday puts the answer in one place: ready-to-use prompts, agents and workflows, tested on real client work. They work with Claude, ChatGPT or Gemini, whichever you already use. Free tool to start with: Skill Audit, below.
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Why "better templates" is the wrong question, and what to invest in instead.
mayday is operated by Just Jane, the Belgian marketing business that runs marketing for start-ups and scale-ups. Every mayday tool and explainer is tested on live client work before it's released, nothing ships from theory alone.
It was founded in 2026 by Jantien Vanderbeke, a marketing strategist and AI expert with over a decade in the field.
Paste or upload a skill and see what it does, who it's for, and whether it's safe to install. A color-coded verdict with plain-English findings, no sign-up needed.
Upload a skill to check what it does, who it's for, and whether it's safe to install.
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One short, practical explainer on AI in your marketing, whenever there's something worth sharing. Plus first access to every new free tool. Always free.
