Sidenote went through Y Combinator in the Summer 2023 batch and describes itself as: Meeting follow-up, automated. As of November 10, 2026, Y Combinator's directory lists it as Inactive (Y Combinator directory entry, July 21, 2023).
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Key facts
- · Batch: Summer 2023 · Sidenote in the Y Combinator directory
- · Industry: B2B · Sidenote in the Y Combinator directory
- · Team size: 3 · Sidenote in the Y Combinator directory
- · Based: San Francisco · Sidenote in the Y Combinator directory
- · Status: Inactive, as listed by Y Combinator · Sidenote in the Y Combinator directory
Sidenote went through Y Combinator in the Summer 2023 batch, describing itself as Meeting follow-up, automated. Y Combinator's company directory lists it as Inactive. The directory does not say why a company stopped, and this page does not guess.
- Batch
- Summer 2023
- What they did
- Meeting follow-up, automated
- Industry
- B2B
- Team size
- 3
- Based
- San Francisco
- Status
- Inactive, as listed by Y Combinator
Its batch
Summer 2023 had 222 companies in YC's listing: 180 Active, 19 Acquired, 0 Public and 23 Inactive, so Sidenote is one of 23 companies from that batch listed as Inactive (10%). Across YC batches at least two years old, 23% of companies are listed Inactive.
Statuses are Y Combinator's own listing in its public company directory, read on the date shown. YC's directory can drop companies altogether, so the Inactive counts here are a floor, not a full count of companies that stopped. Acquired and Public are as YC lists them; neither says anything about the price or the outcome for founders.
The record: Sidenote in the Y Combinator directory. Measured 2026-11-10 from Y Combinator's company directory.
YC Summer 2023All shut-down YC companiesYC outcomes
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What the Full Report on Sidenote covers
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Warning Bells
Sources
1 cited source found
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