Upstream alternatives
TL;DR: 12 companies doing similar work to Upstream in B2B, ranked by how closely they match what Upstream 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 Upstream. They are scored on how closely their own description overlaps with Upstream's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Upstream?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Snapboard | — | Winter 2020 | 2 | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| Thinkature | — | Summer 2006 | — | Inactive |
| Acunote | — | Winter 2011 | — | Active |
| Post.fm | New email inbox. | Summer 2010 | — | Inactive |
| ZumoDrive | Media in the cloud | Summer 2007 | 15 | Acquired |
| Fithub | — | Winter 2010 | — | Inactive |
| Vimcal | The world's fastest calendar, beautifully designed for remote teams. | Summer 2018 | 9 | Active |
| Assorted Bits | A mobile calendar for all the fun stuff you do with friends. | Summer 2012 | — | Inactive |
| Team Apart | — | Summer 2008 | 2 | Inactive |
| Retool | Build internal tools fast. | Winter 2017 | 300 | Active |
| ZeroMailer | Easy mailing lists | Summer 2012 | 2 | Acquired |
Is Upstream still active?
Upstream is still operating, so switching is a choice rather than a forced migration. Compare on fit and price rather than urgency.
How was this list put together?
Every company here is Y Combinator-backed and shares at least one category with Upstream. They are then ranked on how closely their own description overlaps with Upstream's, so the closest matches come first rather than whoever happens to share a tag.