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Read 28 Vellum reviews and testimonials from customers, explore 22 case studies and customer success stories, and watch 3 customer videos to see why companies chose Vellum as their AI Automation Software

Vellum’s best-in-class prompt playground lets you systematically iterate and refine prompts with ease. Perform side-by-side comparisons between models from any provider - close sourced, open sourced, and even self-hosted. Use Vellum to build and ship reliable AI solutions. Define, evaluate and monitor AI solutions through test-driven development for AI.

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  • 28 Testimonials View
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Customer Rating Review Score based on 497 reference ratings
4.8/5.0 (497)
  • Winter 2026 Top Performer AI Automation Software
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28Testimonials

  • ‍"If I’m reviewing a prompt comparison, I can share it instantly, and my team can see exactly what I’m looking at. It’s made collaboration so much easier and faster."

    Xinchi Qi Co-Founder

  • "This is just a great newsletter. The content is so helpful, even when I’m busy I read them."

    Jeremy Hicks Solutions Architect

  • "Vellum has completely transformed our AI development process. What used to take weeks now takes days, and the collaboration between our teams has never been smoother. We can finally focus …

    Marina Trajkovska Founding Developer
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22 Case Studies

  • How GravityStack Cut Credit Agreement Review Time by 200% with Agentic AI

    Bryon Bratcher Managing Director

  • How Codingscape improved time-to-market for their AI apps

    Chris Shepherd AI Product Manager

  • How Coursemojo Sped Up AI Delivery by 6+ Months

    Jamie Forrest Chief Technology Officer
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3 Customer Videos

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Additional Vellum Information & Resources

Read Vellum Reviews, Testimonials & Customer References from 28 real Vellum customers.

Browse Vellum Case Studies, Customer Success Stories, & Customer References from 22 businesses that use Vellum.

Watch Vellum Customer Videos to learn why 3 businesses chose Vellum.

FeaturedCustomers has 2,107,712+ validated customer references including reviews, case studies, success stories, customer stories, testimonials and customer videos that will help you make better software purchasing decisions.