Harold Martin — AI • Python • Data • Mobile

Featured OSS: graphviz2drawio

Convert graphviz (dot) files to editable diagrams for draw.io / Lucid / mxGraph. CLI + library, packaged for Homebrew, pipx, and Conda.

Python CLI Graphviz Diagrams

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Archive Overcast listening history and episode metadata to SQLite. Great for personal analytics & transcripts.

PythonSQLitePodcasts

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Minute‑by‑minute weather logs from an AmbientWeather station over LAN — no cloud API required.

PythonIoTSQLite

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Type stubs for Pythonista on iOS to unlock autocompletion + better checks in editors.

PythonTypingiOS

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Interactive marimo notebook + Python library for modeling NPV of AI initiatives with Beta‑PERT inputs.

PythonMarimoMonte Carlo

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CLI + library to convert dot → draw.io / Lucid (mxGraph/MaxGraph). Ships on Homebrew and Conda; pipx recommended.

PythonGraphvizVisualization

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AI‑powered data products: offline‑first, SQLite‑centric analytics, and LLM‑assisted UX.
Mobile apps (Android/Kotlin, iOS/Swift & Pythonista) with a bias toward reliability and great DX.
Developer tools: graph tooling, simulation frameworks, and CLI utilities.

Python • FastAPI • uv SQLite • DuckDB Pandas • Polars Android • Kotlin • Jetpack Swift • SwiftPM TypeScript • Svelte Graphviz

I write occasionally about OSS, modeling, and product direction.

Substack

DMs open on X, or reach out on LinkedIn. Email available in select repos’ README files. Happy to chat about consulting, collaborations, or OSS.

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