14th December 2025
Tool
Blog to Newsletter
— Generate newsletter HTML from a Datasette backup of simonwillison.net for copying into Substack. Users can filter content by date range (1-60 days), exclude previously featured links, reorder stories with drag-and-drop or keyboard controls, and customize sponsor messages. The tool detects URLs longer than 200 characters with options to edit them, displays previous newsletter links for reference, and allows removal of individual non-entry items before copying formatted HTML to clipboard.
Recent articles
- Hello Python 3.15, goodbye 3.10, and now I can use 3.11 - 12th October 2026
- A new feature for my blog, built using my voice - 9th October 2026
- Claude Haiku 5.5 - 7th October 2026
- We're going to need default hard budget caps on pretty much everything - 3rd October 2026