Notes from the build.

Founder-direct field bulletins on what we’re shipping and why.

For release notes ordered by version, see changelog.

FILED2026-04-28

Latest Bulletin · No. 01

Product2026-04-28Filed by — Yash Agarwal

Brief by Slack DM, not just email

Your weekday morning brief now lands as a Slack 1:1 DM if you'd rather read it where the rest of your work lives. Same content, same trust posture, one fewer tab.

Read the full bulletin →

Earlier bulletins

Filed in reverse chronological order.

No. 02 · II
Engineering2026-04-22
The 12 signals + the invariants that keep them honest
A walk through each of Sonar's twelve signals — five about individual change, five about team and process, two that turn the lens on the manager — and the safety rules that have to pass before any of it shows up in your brief.
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No. 03 · III
Company2026-04-05
Joining the first 12
We're opening Sonar to the first twelve managers ahead of GA. If you run a small team and want to shape what Sonar becomes, here's how it works.
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No. 04 · IV
Product2026-03-18
Why we built Sonar
A short-version manifesto: most management software optimizes for the company, not the manager. We're trying to fix that, with a morning brief that respects the people it's about.
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Notes from the build.

Brief by Slack DM, not just email

The 12 signals + the invariants that keep them honest

Joining the first 12

Why we built Sonar