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Not Diamond vs Vellum: Which DevOps Tools Is Better in 2026?

Compare pricing, features, integrations, verified reviews, AI capabilities, security, and customer satisfaction, side by side, with no marketing spin.

Not Diamond
Not Diamond
Rating
,
Reviews
0
From
Custom

in DevOps Tools

Vellum
Vellum
Leads 3/9
Rating
,
Reviews
0
From
Custom

in DevOps Tools

Jump to scorecard Ask SIA

The Short Answer

Not Diamond vs Vellum, in 15 seconds

Choose Not Diamond if…

  • You prefer Not Diamond's approach and ecosystem

Choose Vellum if…

  • You depend on a broad integration ecosystem
  • You want deeper AI and automation features
  • You need the broader feature set

Head-to-Head Scorecard

How Not Diamond and Vellum score

Vellum leads on 3 of 9 measured dimensions.

  • Customer Rating

    Average score from verified user reviews

    Even
    Not
    No reviews
    Vellum
    No reviews

  • Review Volume

    Number of verified reviews, a proxy for adoption

    Even
    Not
    0
    Vellum
    0

  • Entry Pricing

    Lowest published starting price (free plan = lowest)

    Even
    Not
    Custom
    Vellum
    Custom

  • Free Access

    Availability of a free plan and/or free trial

    Even
    Not
    Free trial
    Vellum
    Free trial

  • Integrations

    Number of listed third-party integrations

    Vellum
    Not
    0
    Vellum
    6

  • Features

    Number of listed product capabilities

    Vellum
    Not
    5
    Vellum
    8

  • AI Features

    Capabilities mentioning AI, automation or ML

    Vellum
    Not
    ,
    Vellum
    3

  • Security & Compliance

    Number of listed compliance certifications

    Even
    Not
    2
    Vellum
    2

  • Platforms & Deployment

    Supported platforms and deployment options

    Even
    Not
    4
    Vellum
    4

Feature Comparison

Not Diamond vs Vellum feature breakdown

Search or filter the full feature matrix, core features, AI, integrations, APIs, security and compliance.

Not Diamond
Vellum
Overview
User rating
,
,
Pricing model
Quote-based
Quote-based
Starting price
Custom
Custom
Free version
Free trial
Features
Key capabilities
Model routingCost optimizationSub-agents and cachingSecure APIEnterprise SLAs
Visual workflow builderPrompt and eval managementDeployment and versioningMonitoringAI developmentAi testing+2
AI features
,
AI developmentAi testingLLM evaluation
Integrations & API
Integrations
,
OpenAIAnthropicLangChainLlamaIndexPython SDKGitHub Actions
Public API
Platforms
Deployment
CloudSaaS
CloudSaaS
Platforms
WebAPI
WebAPI
Mobile support
Security & Compliance
Compliance
SOC 2GDPR
SOC 2GDPR
Vendor
Company
,
,
Verified
Founded
2023
2023
Headquarters
San Francisco, California, USA
New York, New York, USA

Pricing Comparison

Not Diamond vs Vellum pricing

Entry pricing, plan tiers and the cost factors that shape total cost of ownership.

Not Diamond

Custom to start
CustomCustom

Vellum

Custom to start
ProfessionalCustom
  • visual workflow builder
  • Integrations
  • Standard support
  • prompt and eval management
EnterpriseCustom
  • Dedicated support and onboarding
  • deployment and versioning
  • monitoring
  • Advanced security and controls

Total cost of ownership factors

Free planNot Vellum
Free trial to evaluateNot Vellum
Transparent published pricingNot Vellum
Public API (build vs. buy add-ons)Not Vellum

Beyond list price, factor in implementation, training, add-ons and per-seat scaling when estimating total cost of ownership.

Pros & Cons

Not Diamond vs Vellum: strengths and trade-offs

Not Diamond

Pros

  • Free trial offered
  • Compliance: SOC 2, GDPR
  • Public API available

Cons

  • No free plan
  • Pricing is quote-based (less transparent)
  • Fewer native integrations than the alternative

Vellum

Pros

  • Free trial offered
  • Broad integration ecosystem (6)
  • Compliance: SOC 2, GDPR
  • Stronger AI / automation features
  • Public API available

Cons

  • No free plan
  • Pricing is quote-based (less transparent)

Buyer Fit

Who should use Not Diamond vs Vellum?

Startups

Either

Either keeps early-stage costs lowest with its entry tier.

Small businesses

Either

Either offers the most accessible pricing for lean teams.

Agencies

Vellum

Vellum connects to more tools for multi-client workflows.

Enterprises

Vellum

Vellum leads on compliance and breadth for complex needs.

Ecommerce

Vellum

Vellum integrates with more of the commerce stack.

SaaS companies

Vellum

Vellum is the more developer- and automation-friendly choice.

Integration overlap

Only in Not Diamond (0)

Only in Vellum (6)

OpenAIAnthropicLangChainLlamaIndexPython SDKGitHub Actions

Keep Exploring

Other alternatives worth considering

Similar devops tools products buyers compare alongside Not Diamond and Vellum.

PromptLayer

PromptLayer

Custom
Agenta

Agenta

Custom
Langfuse

Langfuse

Custom
LangSmith

LangSmith

Custom
Opik

Opik

Custom
Confident AI

Confident AI

Custom
More Not Diamond alternatives →More Vellum alternatives →

Ask SIA which solution fits your business

SIA, Saaskart's AI buying assistant, weighs Not Diamond and Vellum against your team size, budget, integrations and compliance needs, then recommends the right fit and the questions to ask each vendor.

Get a personalised recommendation

Not Diamond vs Vellum, Frequently Asked Questions

What is the difference between Not Diamond and Vellum?

Not Diamond and Vellum are both DevOps Tools solutions. Not Diamond is rated 0.0/5 by 0 users, while Vellum is rated 0.0/5 by 0 users. The main differences lie in pricing, features, and target audience.

Which is better, Not Diamond or Vellum?

Based on user ratings, Not Diamond scores higher at 0.0/5. The best choice depends on your team size, budget, and specific requirements.

Which is cheaper, Not Diamond or Vellum?

Both products have custom pricing. We recommend contacting both vendors for a quote tailored to your team size.

Does Not Diamond or Vellum have a free plan?

Neither Not Diamond nor Vellum currently offers a free plan, but Not Diamond provides a free trial.

Can I switch from Not Diamond to Vellum?

Switching between Not Diamond and Vellum is possible. Both support data export. Check integration compatibility and plan for data migration to minimise disruption to your team.

Who should use Not Diamond vs Vellum?

Not Diamond is best suited for teams that prioritise enterprise features. Vellum works well for teams needing advanced capabilities.

Our Verdict

The bottom line on Not Diamond vs Vellum

Best Overall

Either

It's a tie balances user satisfaction and proven adoption.

Best for Startups

Either

It's a tie has the friendliest entry point for new teams.

Best for Enterprise

Vellum

Vellum leads on compliance and feature breadth.

Best Value

Either

It's a tie delivers the lowest cost to get started.

Best AI Features

Vellum

Vellum ships more AI and automation.

Highest Rated

Either

Both earn equal user ratings.

Ready to decide between Not Diamond and Vellum?

Visit Not Diamond Visit Vellum Ask SIA
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