Siasto alternatives
TL;DR: 12 companies doing similar work to Siasto in B2B, ranked by how closely they match what Siasto 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 Siasto. They are scored on how closely their own description overlaps with Siasto's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Siasto?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Acunote | — | Winter 2011 | — | Active |
| Snapboard | — | Winter 2020 | 2 | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| Thinkature | — | Summer 2006 | — | Inactive |
| Post.fm | New email inbox. | Summer 2010 | — | Inactive |
| ZumoDrive | Media in the cloud | Summer 2007 | 15 | Acquired |
| Fithub | — | Winter 2010 | — | Inactive |
| Fibo | SaaS calendar and messaging for SMBs | Winter 2017 | 15 | Inactive |
| 100x | Create, Share, and Monetize AI Agents | Summer 2022 | 3 | Active |
| Team Apart | — | Summer 2008 | 2 | Inactive |
| Retool | Build internal tools fast. | Winter 2017 | 300 | Active |
| ZeroMailer | Easy mailing lists | Summer 2012 | 2 | Acquired |
Is Siasto still active?
Siasto 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 Siasto. They are then ranked on how closely their own description overlaps with Siasto's, so the closest matches come first rather than whoever happens to share a tag.