Vellum alternatives
TL;DR: 12 companies doing similar work to Vellum in B2B, ranked by how closely they match what Vellum 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 Vellum. They are scored on how closely their own description overlaps with Vellum's, and all facts shown come from the YC company records — nothing is estimated.
What are the best alternatives to Vellum?
| Alternative | What it does | Batch | Team | Status |
|---|---|---|---|---|
| Langfuse | Open source LLM engineering platform | Winter 2023 | 26 | Acquired |
| PagerDuty | Real-time visibility into critical apps and services all in one place. | Summer 2010 | 950 | Public |
| GitLab | A complete DevOps platform delivered as a single application. | Winter 2015 | 2000 | Public |
| Optimizely | The first all-in-one operating system for marketing | Winter 2010 | 1500 | Acquired |
| IcePanel | Design and explain complex software architecture. | Winter 2023 | 9 | Active |
| Algolia | A developer-friendly and enterprise-grade search API. | Winter 2014 | 810 | Active |
| Authy | Authy is a Two-Factor Authentication platform for developers | Winter 2012 | 201 | Acquired |
| Sendbird | The AI agent that doesn’t just support, it delights. | Winter 2016 | 300 | Active |
| DevCycle | Feature Flag Management Built for Developers | Winter 2014 | 55 | Acquired |
| Mailgun | Email API service. | Winter 2011 | 51 | Acquired |
| Rescale | High Performance Computing Built for the Cloud | Winter 2012 | 250 | Active |
| Swiftype | Smart search for the modern team. | Winter 2012 | 50 | Acquired |
Is Vellum still active?
Vellum 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 Vellum. They are then ranked on how closely their own description overlaps with Vellum's, so the closest matches come first rather than whoever happens to share a tag.