Substrate

Help Claude understand your customers. Stop re-explaining every customer to Claude. Substrate keeps a page on each one, current from your Gmail, Notion and files, and Claude Code, Cowork and Codex recall it on every prompt. Read every page. Edit any line. Delete a line and Claude stops seeing it. I built it because I kept pasting the same customer context into Claude in my own company. Who is who, what they asked for, what I still owe them. Drop in a customer file and watch their page appear. You can also connect Gmail (you pick how far back, newsletters and automated mail are skipped) or Notion. Substrate writes one page per customer, with the people there and the open tasks. Every line cites its source. E.g. you have a quarterly review with a customer next week. Ask Claude to prepare the deck - it already knows who will be in the room and what you still owe them. Recall brings the facts relevant to your prompt, not everything. If a line is wrong, fix it. Delete it and Claude stops seeing it. OAuth sign-in, no API keys. Open beta. For founders and operators who already work through Claude. First 2 weeks free with code LAUNCH26, then $20/mo. Would love your feedback.