nightswimmer
Small webapps, built to solve real problems.
A growing collection of browser-based tools — electronics calculators, image utilities, home-automation helpers, and a few curiosities. All open source, all running straight from your browser.
Apps
Click a screenshot to preview it full-size. Use the buttons to try the app or view its source on GitHub.
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Endless Halls
A browser-based solver for the Endless Halls maze event in World of Warcraft. Enter your exploration paths and it deduces the unique 8×8 map layout.
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Home Assistant Position Editor
A visual editor for Home Assistant picture-elements cards. Drop in a floor plan, drag entity icons to reposition them, and export updated YAML with comments preserved.
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DC-DC Feedback Divider
Design resistor feedback dividers for adjustable DC-DC converters. Supports multiple output voltages and standard E-series component pools.
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TPS54360B Calculator
A single-file tool that designs the complete external component set for the Texas Instruments TPS54360B buck converter.
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Inrush Current Analyzer
A browser-based tool for analyzing DC capacitor inrush current, sizing inrush limiters, and evaluating NTC energy-absorption ratings.
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SVG Optimizer
Inspect, refactor, and slim down SVG files — especially the bloated output Inkscape tends to produce. Everything runs locally in the browser.
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GroundScale
Measure real-world distances and areas directly on 2D images — drop in a photo, set a reference, and read off the rest.
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Pixlite
A standalone, browser-based image editor packaged as a single HTML file — crop, resize, rotate, adjust and export without installing anything.
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Compoundator
A simple, mobile-first compound interest calculator. Runs in any browser, installs as a PWA, and also ships as a native Android APK.