Signal Lock publishes measured studies of how AI assistants like ChatGPT, Claude, Gemini and Perplexity describe local businesses, using counted answers and cited sources. Issues cover directory citations, the limits of free AI visibility scores, and a before-and-after test of a website rebuilt to be readable by AI assistants.

A hyperlocal column covering openings, closings, moves and events among merchants, restaurants and businesses in Davis, California. Readers get specific details such as addresses, dates, hours and quotes from owners, often as first reports.

A hyperlocal newsletter covering news, businesses, events and quirks of the Longfellow neighborhoods in Minneapolis. Readers get reported updates on local issues like school decisions, new openings, and community projects such as an annual Halloween display survey with interactive maps.

A Norwich-focused local newsletter mixing long-form features on people, businesses and places in the city with news items. Recent issues cover a folk musician's lockdown years in a former RAF base, a rivalry between two local vacuum repair engineers, and precision-bred tomatoes developed at the John Innes Centre.