Charlie
Make a killer impression on anyone you meet with
In plain words
Charlie is an iOS app designed to help users make strong first impressions when meeting new people. It provides tools and features to enhance social interactions and personal presentation. The app is intended for anyone looking to improve their networking or social encounters. Charlie stands out for its focus on the practical aspects of making memorable connections in everyday situations.
written from the facts on this page · September 2026
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Hi HN, I built Eigendrum, a web tool that solves the 2D wave equation for arbitrary shapes so you can hear what they sound like as drums. How it works: * Solves -∇²u = λu using finite element analysis (Kφ = λMφ) on a triangle mesh. * Validated to <0.1% error against closed-form solutions for circles (Bessel zeros) and rectangles. * Sound model factors in strike location, Rayleigh damping, and mallet width. * Includes Kac drums I & II to demonstrate identical sound spectra from different geometries. * No frameworks, build steps, or dependencies. Repo and tests:…
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