ChatGPT vs Rezi vs ByAgentAI: Which is Best?
Use ChatGPT for drafting content, Rezi for ATS-optimized PDF resumes, and ByAgentAI for portfolio websites with AI chatbots. ChatGPT is a writing assistant, Rezi specializes in corporate job applications, and ByAgentAI creates your digital presence. The best strategy uses multiple tools for different purposes.
With so many AI career tools available, choosing the right one can be overwhelming. We compare the heavy hitters to help you decide which is best for your goals.
Quick Comparison
| Feature | ChatGPT | Rezi | ByAgentAI |
|---|---|---|---|
| Best For | Content drafting | ATS optimization | Portfolio websites |
| Output | Text only | PDF resume | Live website |
| AI Chatbot | ❌ | ❌ | ✅ Included |
| Price | Free-$20/mo | $3-29/mo | Free |
ChatGPT: The Generalist
ChatGPT is great for brainstorming and drafting bullet points, but it lacks the specialized formatting and ATS-optimization features of dedicated tools.
Strengths
- Excellent for generating achievement statements
- Can customize tone and style
- Useful for cover letter drafts
- Free tier available
Limitations
- No resume formatting capabilities
- Can't create visual documents or websites
- No ATS optimization features
- Output requires manual assembly
Rezi: The ATS Specialist
Rezi focuses heavily on passing applicant tracking system filters. It's excellent for creating high-quality PDF resumes optimized for corporate hiring systems.
Strengths
- Industry-leading ATS optimization
- Clean, professional templates
- Keyword analysis and suggestions
- Good for corporate job applications
Limitations
- PDF-only output
- No portfolio website creation
- Subscription required for full features
- Focused on traditional applications
ByAgentAI: The Modern Portfolio Builder
ByAgentAI takes it a step further by converting your data into a live, interactive website. In 2026, having a digital presence is just as important as having a good PDF.
Strengths
- Creates professional portfolio websites
- AI chatbot answers recruiter questions 24/7
- Upload LinkedIn/PDF and generate instantly
- Free tier with no time limits
- Mobile-responsive, SEO-optimized
Limitations
- Focused on websites, not PDF optimization
- Still need a separate ATS-optimized PDF for formal applications
When to Use Each Tool
Use ChatGPT when:
You need help writing achievement statements, summaries, or cover letters from scratch.
Use Rezi when:
You're applying through corporate job portals and need an ATS-optimized PDF resume.
Use ByAgentAI when:
You want a professional portfolio website that differentiates you and engages recruiters.
Who Should (and Shouldn't) Use Each
For job seekers applying to corporations:
- Primary: Rezi for ATS-optimized PDF
- Secondary: ByAgentAI for portfolio link in resume header
- Support: ChatGPT for content drafting
For freelancers and consultants:
- Primary: ByAgentAI for client-facing portfolio
- Support: ChatGPT for proposal writing
For tech and creative roles:
- Primary: ByAgentAI for project showcases
- Secondary: Rezi for formal applications
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Get Started →Frequently Asked Questions
Can ChatGPT write my resume?
ChatGPT can help draft bullet points and summaries, but it can't format, optimize for ATS, or create a visual resume/portfolio. It's a writing assistant, not a resume builder. You'll still need another tool to produce the final document.
Is Rezi worth the subscription?
Rezi is excellent for ATS optimization if you're applying to corporate jobs. It's worth it if you need PDF resumes that pass automated screening. However, it doesn't create portfolio websites or include AI chatbots for recruiter engagement.
What makes ByAgentAI different?
ByAgentAI focuses on the full picture: converting your resume into a professional website with an AI chatbot that answers recruiter questions 24/7. It's free, takes 5 minutes, and goes beyond just creating a PDF document.
Which tool should I use for job searching?
Use multiple tools strategically: ChatGPT for initial content drafting, Rezi for ATS-optimized PDF resumes, and ByAgentAI for your portfolio website. The combination covers all bases—formal applications and differentiation.
Are AI resume tools worth using?
Yes. AI tools save hours of writing and formatting time while producing professional results. The key is choosing the right tool for your goal: content creation (ChatGPT), ATS optimization (Rezi), or portfolio websites (ByAgentAI).
The Bottom Line
There's no single "best" AI career tool—each serves a different purpose. Use ChatGPT for writing help, Rezi for ATS optimization, and ByAgentAI for your digital presence. The winning strategy uses all three strategically.