AI search engine that answers questions from peer-reviewed scientific papers.
Perplexity vs StealthGPT
Features, pricing, strengths and trade-offs — and which one fits your situation.
The verdict
Summary
Perplexity is best for fast, cited answers to questions using live web search, while StealthGPT is best for rewriting AI-generated drafts so they read less like machine text. Only Perplexity offers searches academic papers. Only StealthGPT offers aI content detection and rewrites / humanizes text. Perplexity has a free plan, while StealthGPT has no free plan.
Which should you choose?
Choose Perplexity if…
- You need fast, cited answers to questions using live web search
- Searches academic papers matters to you
- You're one of: students and researchers, journalists and analysts, professionals replacing traditional search
- You want a free plan (StealthGPT doesn't have one)
Choose StealthGPT if…
- You need rewriting AI-generated drafts so they read less like machine text
- AI content detection matters to you
- Rewrites / humanizes text matters to you
- You're one of: content writers editing ai-assisted drafts where ai use is permitted, marketers adjusting tone of ai copy
At a glance
| Perplexity | StealthGPT | |
|---|---|---|
| Best for | Fast, cited answers to questions using live web search | Rewriting AI-generated drafts so they read less like machine text |
| Free plan | Yes | Check site |
| Starting price | From $20/mo | From $14.99/mo |
| Learning curve | Low | Low |
| Platforms | Web, Windows, macOS, iOS, Android, Chrome extension, API | Web, Chrome extension |
| Ideal for | Students and researchers, Journalists and analysts, Professionals replacing traditional search | Content writers editing AI-assisted drafts where AI use is permitted, Marketers adjusting tone of AI copy |
Feature comparison
| Perplexity | StealthGPT | |
|---|---|---|
| Answers with citations | Yes | Limited |
| Searches academic papers | Yes | No |
| Upload & chat with PDFs | Yes | — |
| AI content detection | No | Yes |
| Rewrites / humanizes text | No | Yes |
| Citation formatting | No | — |
| Browser extension | Yes | Yes |
| Writing editor | No | Limited |
IncludedLimited / higher plansNot available— Not confirmed
Security & enterprise
| Perplexity | StealthGPT | |
|---|---|---|
| Business / enterprise plan | Yes | No |
| SSO (SAML / OIDC) | Enterprise plan | — |
| SCIM user provisioning | Enterprise plan | — |
| SOC 2 | Type II | — |
| ISO 27001 | — | — |
| HIPAA (BAA available) | — | — |
| GDPR DPA | — | — |
| Data residency options | — | — |
| No training on your data | Yes | — |
| Audit logs | — | — |
| Admin controls | Yes | — |
| Deployment | Cloud | — |
From each vendor's security documentation. "—" = not confirmed. What to ask vendors · Compare all tools
What each tool does
Perplexity
Perplexity is an AI answer engine that searches the web in real time and responds with cited sources. It offers focus modes including Academic, Deep Research for longer reports, Labs for building reports and dashboards, Spaces for organizing research, and the Comet AI browser. It is used by students, researchers and professionals as an alternative to traditional search.
Key features- Answers with numbered citations to web sources
- Academic focus mode for scholarly sources
- Deep Research reports from dozens of sources
- Labs for generating reports, spreadsheets and simple web apps
- Spaces for organizing threads and files, with sharing
- Comet AI browser and Chrome extension
StealthGPT
StealthGPT is an AI writing tool that combines a text generator with a 'humanizer' that rewrites AI text to lower AI-detector scores, plus a free AI detector. It is marketed mainly to students and content writers. Using it to submit AI-written work as your own can breach academic integrity and client policies.
Key features- AI humanizer that rewrites existing AI text
- Stealth Writer for generating essays and articles
- Built-in AI detector
- Adjustable rewrite tone and strength
- Chrome extension for rewriting in place (higher tiers)
Pricing
Perplexity
Free plan; Pro $20/mo (~$200/yr); Max $200/mo
StealthGPT
Paid from ~$14.99/mo; ~30% off annual
Prices last checked September 2026. Plans change often — confirm on each vendor's site.
Pros and cons
Perplexity
Strengths- Citations make answers easy to verify
- Free plan is useful for everyday search
- Choice of models from several providers on paid plans
- Available on nearly every platform, including its own browser
- Can cite low-quality or misread sources, so links still need checking
- Academic mode is less rigorous than dedicated paper databases like Consensus or Elicit
- No built-in citation formatting or long-form writing editor
- File uploads in Spaces require a paid plan
Not ideal for: Researchers doing systematic reviews that need structured paper screening should use Elicit or Consensus instead.
StealthGPT
Strengths- Simple paste-and-rewrite workflow
- AI detector can be used without signing up
- Combines generation and rewriting in one tool
- Tone controls help match a target style
- No permanent free plan for the humanizer
- Independent tests show mixed results against current detectors
- Rewrites can introduce awkward phrasing or change meaning
- Using it to disguise AI work can violate school and employer policies, with serious consequences
Not ideal for: Students whose institutions prohibit undisclosed AI use should not use it for graded work; a research or citation tool is a better fit for legitimate study.
Integrations
Perplexity
StealthGPT
FAQ
What is the main difference between Perplexity and StealthGPT?
Perplexity is built for fast, cited answers to questions using live web search; StealthGPT is built for rewriting AI-generated drafts so they read less like machine text. Key differences: Perplexity offers searches academic papers; StealthGPT offers aI content detection and rewrites / humanizes text.
Is Perplexity or StealthGPT cheaper?
Perplexity starts from $20/mo and StealthGPT starts from $14.99/mo (as of September 2026). On entry price, StealthGPT is cheaper — but compare what each plan includes, since limits differ. Always confirm current pricing on each vendor's site.
Do Perplexity and StealthGPT have free plans?
Perplexity has a free plan, while StealthGPT has no free plan.
Which is easier to use, Perplexity or StealthGPT?
Both have a low learning curve.
What are good alternatives to Perplexity and StealthGPT?
Other research & study tools worth comparing include Consensus, Monica and Merlin AI.
