Spline alternatives
TL;DR: 12 companies doing similar work to Spline in B2B, ranked by how closely they match what Spline 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 Spline. They are scored on how closely their own description overlaps with Spline's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Spline?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Snapboard | — | Winter 2020 | 2 | Inactive |
| Insoshi | — | Winter 2008 | — | Inactive |
| Thinkature | — | Summer 2006 | — | Inactive |
| Acunote | — | Winter 2011 | — | Active |
| Retool | Build internal tools fast. | Winter 2017 | 300 | Active |
| ZumoDrive | Media in the cloud | Summer 2007 | 15 | Acquired |
| Fithub | — | Winter 2010 | — | Inactive |
| Post.fm | New email inbox. | Summer 2010 | — | Inactive |
| Brushes | iPad drawing software. | Summer 2010 | — | Inactive |
| ZeroMailer | Easy mailing lists | Summer 2012 | 2 | Acquired |
| Emailio | Email built for wellness | Winter 2014 | 5 | Active |
| 100x | Create, Share, and Monetize AI Agents | Summer 2022 | 3 | Active |
Is Spline still active?
Spline 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 Spline. They are then ranked on how closely their own description overlaps with Spline's, so the closest matches come first rather than whoever happens to share a tag.