MSMS Desk — score an MS/MS spectrum against library candidates, then annotate it honestly

Paste an unknown MS/MS spectrum and candidate library spectra (MGF, MSP or peak list): the browser scores every pair with matchms-equivalent greedy cosine and modified cosine, checks precursor, ion mode and adduct, and draws the mirror plot for free; a paid run judges the candidates with a Schymanski confidence level or writes the methods and results text. Derived from the agent skill @k-dense-ai/matchms (k-dense-ai/scientific-agent-skills, K-Dense Inc.).

Every public app is built from a security-scanned skill and must pass a clean scan — skill and frontend — before it can be listed. Have a skill of your own? Turn it into an app — or read the step-by-step walkthrough.