qsa.sh vs Nessus: Which is Better in 2026?
Choosing between qsa.sh and Nessus comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
qsa.sh
Instant external security scan of your own IP from your terminal
Best for you if:
- • You want to try before committing
- • Run curl qsa.sh from your terminal to instantly scan your public IP for open ports, services, and vulnerabilities using open-source tools.
- • Results stream live and are never stored; you get a full external perspective without installing any software on your host.
Nessus
Vulnerability assessment scanner
Best for you if:
- • Nessus is a vulnerability scanner for identifying security issues
- • It scans networks and systems for vulnerabilities, misconfigurations, and malware
| At a Glance |  qsa.sh |  Nessus |
|---|---|---|
Starts at | FreeFree tier available | $2990/moProfessional |
Best For | Vulnerability Scanning | Vulnerability Scanning |
Rating | - | 4.6/5 |
Free plan | Yes | No |
Choose qsa.sh or Nessus?
Choose qsa.sh if
Instant external security scan of your own IP from your terminal
- Zero installation – just run curl; no agent or software to deploy.
- Transparent and auditable – uses only public open-source tools, no black box.
- Strictly limited to scanning your own IP, with consent gate and opt-out for operators.
Choose Nessus if
Vulnerability assessment scanner
- Industry standard scanner
- Good vulnerability detection
- Comprehensive coverage
| Feature | qsa.sh | Nessus |
|---|---|---|
| Pricing Model | Freemium | Paid |
| User Rating | No ratings yet | ★4.6/5 380 reviews |
| Categories | Vulnerability ScanningTesting & QA | Vulnerability ScanningSecurity |
In-Depth Analysis
qsa.sh
Instant external security scan of your own IP from your terminal
Strengths
- +Zero installation – just run curl; no agent or software to deploy.
- +Transparent and auditable – uses only public open-source tools, no black box.
- +Strictly limited to scanning your own IP, with consent gate and opt-out for operators.
Weaknesses
- -IPv4 only – IPv6 connections are refused.
- -Free scan limited to one per 24 hours and only top 1,000 ports; Full and Deep require payment.
Key features
Value 85/100. The pricing is generous for casual use with a free tier that covers the top 1,000 ports, but the $5/mo Full Pro tier is a steal for continuous scanning of all ports, while $7/scan for Deep is steep for occasional use.
Watch out: Free tier limited to one scan per 24h
Nessus
Vulnerability assessment scanner
Strengths
- +Industry standard scanner
- +Good vulnerability detection
- +Comprehensive coverage
- +Good reporting
- +Active development
Weaknesses
- -Expensive
- -Learning curve
- -Resource intensive
- -Per-asset pricing
- -Better alternatives exist
Key features
Value 75/100. Nessus offers a fair entry point with its free tier, but the Professional tier at $2990/year is quite expensive for basic vulnerability scanning compared to some market alternatives.
Watch out: Pricing is per year, no monthly option
Pricing: qsa.sh vs Nessus
| Plan | qsa.sh | Nessus |
|---|---|---|
| Tier 1 | $0/mo or Free Free | Free Essentials (Free) |
| Tier 2 | $5/mo Full Pro | $2990 Professional |
| Tier 3 | $7/scan Deep | $5890 Expert |
Pricing verified from each vendor's public pricing page. Compare in detail on qsa.sh pricing and Nessus pricing.
Who Should Use What?
On a budget?
qsa.sh has a free tier. Nessus is paid only.
Go with: qsa.sh
Want the highest-rated option?
Nessus is rated 4.6/5. qsa.sh has no ratings yet.
Go with: Nessus
Value user reviews?
qsa.sh: no ratings yet. Nessus: 380 reviews (4.6/5).
Go with: Nessus
3 Questions to Help You Decide
What's your budget?
qsa.sh is freemium. Nessus is paid. qsa.sh lets you start free.
What's your use case?
Both are vulnerability scanning tools. Compare their specific features to decide.
How important are ratings?
Nessus is rated 4.6/5; qsa.sh has no ratings yet.
Key Takeaways
Nessus
- Our pick for this comparison
qsa.sh
- Has a free tier
The Bottom Line
Nessus is our pick. qsa.sh has a free tier if you want to test without paying.
Frequently Asked Questions
Is qsa.sh or Nessus better?
Nessus is rated in our evaluation. qsa.sh is freemium and Nessus is paid.
What are qsa.sh and Nessus used for?
qsa.sh: Instant external security scan of your own IP from your terminal. Nessus: Vulnerability assessment scanner.
What does qsa.sh cost vs Nessus?
qsa.sh is freemium (free tier + paid plans). Nessus is a paid tool. Visit their websites for detailed pricing.