Comparison

Vellum (Personal AI Assistant) vs ChatGPT

Vellum (Personal AI Assistant) lands on Depends, and ChatGPT lands on Worth it.

Vellum (Personal AI Assistant)

Depends

Confidence: Medium

Worth trying if you're a Mac user who wants an open-source, memory-first personal AI and tolerates early-stage risk.

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ChatGPT

Worth it

Confidence: High

Individuals: start free . it's the category default with a 4.7/5 G2 rating.

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Vellum (Personal AI Assistant) versus ChatGPT
Compare	Vellum (Personal AI Assistant)	ChatGPT
Verdict	Depends	Worth it
Best for	Mac users wanting a personal AI	Everyday Q&A and writing
Who it's not for	Enterprises needing a proven LLM platform . this team moved on	Regulated teams handling sensitive data without a business plan
Privacy	No known public vulnerabilities found in the sources reviewed.^⁴	Active CVEs and a confirmed data-exposure breach; the business tier adds stronger privacy controls.
Support quality	Slack Connect plus in-app chat documented	No support evidence in sources
Public sentiment	Sentiment evidence mostly covers the company's earlier AI platform . 4.8/5 on Capterra (8 reviews) and positive G2 remarks . while the new personal assistant has few independent reviews yet.¹⁰	Strong 4.7/5 G2 rating, but a vocal minority reports declining quality, rate limits, and pricing frustration.¹⁵
Biggest gotcha	Most 'Vellum' reviews online are for the unrelated $249 book-formatting app . do not trust them here¹⁴	Consumer chats carry privacy risk; sensitive work needs the business tier's controls

Pick Vellum (Personal AI Assistant) when

Mac users wanting a personal AI
Open-source tinkerers
Privacy-conscious early adopters
People wanting an assistant that remembers context

When Vellum (Personal AI Assistant) is not a fit

Enterprises needing a proven LLM platform . this team moved on
Windows users, if the Mac-first positioning holds
Buyers wanting mature support SLAs and a track record
Self-publishers . that is the other Vellum, vellum.pub

Pick ChatGPT when

Everyday Q&A and writing
Students and solo creators
Developers prototyping code
Small teams experimenting with AI

When ChatGPT is not a fit

Regulated teams handling sensitive data without a business plan
Workflows needing consistent models . GPT-4o retirement forced re-evaluation
Anyone needing traceable citations; Reddit citations cut 81%
Buyers expecting premium support at Plus prices

Sources

Vellum . Personal Intelligence (official site)vellum.ai
official
Vellum Pricingvellum.ai
official
Vellum Docs . Pricing philosophyvellum.ai
official
Vellum Docs . Data Privacy and Storage (SOC 2 Type 2)docs.vellum.ai
security
vellum-assistant on GitHub (SECURITY.md)github.com
official
Vellum Raises $20M Series A (BusinessWire)businesswire.com
news
Vellum raises $25M for personal AI assistant (LinkedIn)linkedin.com
news
Vellum AI Personal Intelligence for Mac (LinkedIn)linkedin.com
news
Vellum on Y Combinator (YC W23)ycombinator.com
official
Vellum Reviews on G2g2.com
review
Vellum on Capterra (4.8/5, 8 reviews)capterra.in
review
Vellum on AWS Marketplace . reviewsaws.amazon.com
review
Vellum (book formatter) . different product, name collisionvellum.pub
official
Kindlepreneur Vellum review . book formatter, not this productkindlepreneur.com
review
ChatGPT Review: I Used It Daily for 3 Years (Learn.G2)learn.g2.com
review
ChatGPT Trustpilot reviewstrustpilot.com
review