Technology
Technical write-ups on the tools behind building a product: what works, what it costs, and what it takes to make Hebrew work.
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Instinct, a free WhatsApp assistant for business errands
Message it on WhatsApp and it does the task on the site itself: bookings, cancellations, supplier research. It is free. What it does and what access it needs.
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Pull business expenses out of Gmail with Claude or Codex
Connecting Gmail to Claude or Codex, and the prompt that returns an expense table for a date range, including the amounts that only exist inside the attachment.
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A security testing spec for a web app before production
The checklist a site, its API and infrastructure are tested against, from authentication and injection to TLS, with severity ratings and production gates.
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Comparing AI tools for working on your business
Claude Code, Codex, Cursor and Grok Build for a small business: which jobs they close, who runs them, the monthly cost, and where customer data goes.
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Signing PDFs digitally in Node.js and keeping them valid
ByteRange, CMS, PAdES B-T and B-LTA, RFC 3161 timestamps, where the private key lives, and why any edit after signing breaks it. Code included.
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Generating PDFs in Node.js: ten approaches compared
Puppeteer, Playwright, Gotenberg, PDFKit, pdf-lib, react-pdf, jsPDF, Typst and LibreOffice compared, including how each handles Hebrew and RTL.
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Receipt scanning with an LLM and catching invented numbers
OCR versus a vision model, schema-forced output, arithmetic checks that expose an invented field, evals on real receipts, and cost per document.