micro-service.ai

Guides

Running small AI apps on a small bill

Each guide is built on numbers from apps we actually run, cites its sources, and links to the calculator that does the maths for you.

  1. 01 Six sites and a database on one $5 VPS How we run six content sites, their forms database and our analytics on one 1 GB, $5 a month server: the setup, measured memory and CPU, and its limits.
  2. 02 Prompt caching: the maths, with current prices A worked example of what prompt caching saves on Claude, GPT and Gemini at October 2026 list prices, when it pays off, and what it doesn't touch.
  3. 03 A $0 double opt-in newsletter with PocketBase and Brevo How our sites run newsletter sign-ups for $0 a month: a PocketBase hook for double opt-in, Brevo's free tier for sending, and the details that keep it out of spam.

Price Watch: AI and hosting price changes, once a month

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