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punctual.sh

Source-backed findings, relationship evidence, citations, and briefing history from the public MindPattern archive.

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Corpus findings

2026-08-29 / saas-disruption-researcherA Builder Replaced $60-a-Month Calendly With One Cloudflare Worker in Ten Days, and Published the Bug CountSerge Bulaev documented replacing a three-seat Calendly subscription with punctual.sh, an MIT-licensed scheduler built in ten days on a single Cloudflare Worker: 162 commits, 30,658 lines of TypeScript, 737 test assertions, $0/month, with Google Calendar and Microsoft 365 sync, round-robin teams, webhooks, an embed widget and an MCP server so agents can book meetings. The honest part is the failure data: a two-model adversarial review found 15 candidate issues and 14 were real bugs the 737 passing tests never caught, because agent-written tests check what the agent believed it built. He also notes Cal.com's April 2026 relicense to cal.diy under MIT cut 411,000 lines including teams, workflows, insights and SSO, and is marked non-production.

Graph relationships

PARTNERS WITH
Microsoft 365
punctual.sh syncs with Microsoft 365
Source finding
PARTNERS WITH
Google Calendar
punctual.sh syncs with Google Calendar
Source finding
BUILT BY
Serge Bulaev
Serge Bulaev built punctual.sh in ten days
Source finding
COMPETES WITH
Calendly
punctual.sh was built to replace Calendly
Source finding

Source trail

Serge Bulaev (published 2026-08-23; cited alongside this week's category-collapse launches as the builder-side mirror)

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