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AI · head to head

C3 AI Suite vs Vellum

C3 AI Suite logo

C3 AI Suite

AI

Model-driven application platform for building enterprise AI on top of existing operational systems

From
On request
Rated
-
Full reviewWebsite
Vellum logo

Vellum

AI

Personalized AI assistant with persistent memory and autonomous action-taking

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Vellum has a free tier, so it costs nothing to try first.
  • Each has a real cost: C3 AI Suite the commercial model bundles software with heavy professional services, so the licence line in the quote understates the first-year cost by a wide margin and budgets set from the licence alone overrun.; Vellum pricing varies significantly by computational tier, making budget planning difficult
  • They diverge on capability: C3 AI Suite covers Type system, Vellum covers Persistent AI identity.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which C3 AI Suite and Vellum actually diverge.

Attributes where C3 AI Suite and Vellum differ
AttributeC3 AI SuiteVellum
Starting priceOn requestFree
Pricing modelquoteFreemium with paid plans and pay-as-you-go credits
Free tierNoYes
PlatformsWeb, LinuxWeb, macOS, iOS, Slack, Telegram, Terminal

Identical on both: user rating (Not yet rated), category (AI).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in C3 AI Suite

  • Type system
  • Pre-built applications
  • Model lifecycle
  • C3 Generative AI
  • Multi-cloud deployment
  • FedRAMP and IL environments

Only in Vellum

  • Persistent AI identity
  • Long-term memory
  • Email automation
  • Calendar management
  • Autonomous task execution
  • Multi-device synchronization
  • Custom plugins
  • Open-source deployment

What people use each for

The jobs each tool is most often brought in to do.

C3 AI Suite

  • A utility with decades of SCADA history wanting failure prediction on transformers without hiring a data science teamnot Vellum
  • A defence agency needing an AI platform accredited for classified environments rather than a commercial SaaSnot Vellum
  • An oil and gas operator consolidating condition data from OSIsoft PI, SAP and bespoke historians into one modelnot Vellum
  • A bank building transaction monitoring where the vendor supplies both the models and the analysts who tune themnot Vellum

Vellum

  • Personal productivity automation across email and calendarnot C3 AI Suite
  • CRM updates and pipeline managementnot C3 AI Suite
  • Expense report generation and managementnot C3 AI Suite
  • Document drafting and content creationnot C3 AI Suite
  • Meeting scheduling and calendar coordinationnot C3 AI Suite

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

C3 AI Suite

  • The commercial model bundles software with heavy professional services, so the licence line in the quote understates the first-year cost by a wide margin and budgets set from the licence alone overrun.
  • Applications are written against C3 proprietary types, so nothing built on the platform ports to a generic Spark or Databricks stack without a rewrite, which makes exit expensive after two or three years.
  • Contracts have historically been large multi-year commitments with a small number of very large customers, which means pricing is negotiated case by case and small buyers get little leverage.
  • Skills are scarce outside C3 itself, so hiring an engineer who already knows the platform is hard and the customer stays dependent on the vendor for extensions.
  • Pre-built applications need substantial configuration against the customer data model before they produce anything, so the marketing claim of a packaged app understates the integration work by months.

Vellum

  • Pricing varies significantly by computational tier, making budget planning difficult
  • Requires explicit permission for sensitive actions, limiting autonomy
  • Self-hosting option may intimidate non-technical users
  • Learning curve to develop customizations with plugins

Pricing, plan by plan

C3 AI Suite

On request
  • C3 AI Suite$undefined/year
    • Platform subscription sized by application and data volume
    • Paid pilot engagement typically precedes a subscription
    • Professional services quoted separately

Vellum

Free
  • FreeFree
    • Starter credits included
    • Basic features
  • Mighty$30/month
    • 1 vCPU, 2 GiB RAM
    • 10 GB storage
    • Included usage allowance
  • Super$100/month
    • 2.5 vCPU, 5 GiB RAM
    • 30 GB storage
    • Assistant email and subdomain
  • Ultra$200/month
    • 4 vCPU, 8 GiB RAM
    • 60 GB storage
    • Assistant email and subdomain

Which should you pick?

Choose C3 AI Suite if

  • You need type system.
  • You work on Web, Linux.
  • You also want pre-built applications.
C3 AI Suite review

Choose Vellum if

  • You need persistent ai identity.
  • You want to start without paying.
  • You work on Web, macOS, iOS, Slack, Telegram, Terminal.
  • You also want long-term memory.
Vellum review

Questions people ask

Is C3 AI Suite or Vellum better?
Neither clearly leads. C3 AI Suite starts at On request and Vellum at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, C3 AI Suite or Vellum?
Vellum has a free tier; the other does not. Paid plans start at On request for C3 AI Suite and Free for Vellum.
Does C3 AI Suite or Vellum run on more platforms?
C3 AI Suite runs on Web, Linux. Vellum runs on Web, macOS, iOS, Slack, Telegram, Terminal.
Can I use Vellum for free?
Yes. Vellum has a free tier, so you can try it without paying. C3 AI Suite starts at On request.
What is C3 AI Suite best used for?
C3 AI Suite is most often used for a utility with decades of scada history wanting failure prediction on transformers without hiring a data science team, a defence agency needing an ai platform accredited for classified environments rather than a commercial saas, an oil and gas operator consolidating condition data from osisoft pi, sap and bespoke historians into one model, a bank building transaction monitoring where the vendor supplies both the models and the analysts who tune them. Of those, a utility with decades of scada history wanting failure prediction on transformers without hiring a data science team and a defence agency needing an ai platform accredited for classified environments rather than a commercial saas are not what Vellum is typically brought in for.
What can C3 AI Suite do that Vellum cannot?
C3 AI Suite covers Type system, Pre-built applications, Model lifecycle, C3 Generative AI. Vellum covers Persistent AI identity, Long-term memory, Email automation, Calendar management.

Answered from the vendors’ own pages

C3 AI Suite: Does C3 publish pricing?

No. Everything is quoted, and the shape of the deal, pilot then subscription, means the first number you see is for a proof of value rather than the platform.

Vellum: How does Vellum protect my data privacy?

Vellum uses permission-based controls requiring explicit approval for sensitive actions. Data is encrypted and the option for self-hosting provides complete data control. Open-source deployment option allows hosting on your own infrastructure.

Source
C3 AI Suite: Can it run in a classified environment?

Yes. C3 supports air-gapped and government cloud deployments, including FedRAMP-authorised environments, which is a large part of why defence buyers choose it.

Vellum: Can I use Vellum for business team collaboration?

Vellum is primarily designed as a personal assistant with persistent identity. For team collaboration, platforms like Lindy offer better multi-user features with shared credit pools and Slack workspace integration.

Source
C3 AI Suite: Do we own the models we build?

You own the models and the data. The application logic is written in C3 types, so the artefacts are portable in principle and impractical to move in practice.

Vellum: What does the free tier include?

Vellum offers free starter credits to begin using the platform. Beyond that, it operates on a pay-as-you-go credit model with paid tiers starting at $30/month for increased computational resources and bundled credits.

Source
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