Sidenote alternatives
TL;DR: 12 companies doing similar work to Sidenote in B2B, ranked by how closely they match what Sidenote actually does — not just by category.
How this list was built: every company here is Y Combinator-backed and shares at least one category with Sidenote. They are scored on how closely their own description overlaps with Sidenote's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Sidenote?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Snapboard | — | Winter 2020 | 2 | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| Thinkature | — | Summer 2006 | — | Inactive |
| Acunote | — | Winter 2011 | — | Active |
| ZumoDrive | Media in the cloud | Summer 2007 | 15 | Acquired |
| Fithub | — | Winter 2010 | — | Inactive |
| Post.fm | New email inbox. | Summer 2010 | — | Inactive |
| Fibo | SaaS calendar and messaging for SMBs | Winter 2017 | 15 | Inactive |
| Assorted Bits | A mobile calendar for all the fun stuff you do with friends. | Summer 2012 | — | Inactive |
| Retool | Build internal tools fast. | Winter 2017 | 300 | Active |
| ZeroMailer | Easy mailing lists | Summer 2012 | 2 | Acquired |
| Vimcal | The world's fastest calendar, beautifully designed for remote teams. | Summer 2018 | 9 | Active |
Is Sidenote still active?
Sidenote is no longer listed as active, so anyone still relying on it should plan a migration to one of the alternatives above.
How was this list put together?
Every company here is Y Combinator-backed and shares at least one category with Sidenote. They are then ranked on how closely their own description overlaps with Sidenote's, so the closest matches come first rather than whoever happens to share a tag.