Shortlist by what you need
Start here if you know why you are leaving Seal Security.
Want the closest match?
MobbMost similar to Seal Security in what it does, its category and its price.
Visit (opens Mobb in a new tab)Need a free plan?
SnykHas a free plan, rated 4.3 out of 5. Seal Security has none.
Visit (opens Snyk in a new tab)Want the lowest price?
Nullify AIFrom $67/mo, the lowest starting price here.
Visit (opens Nullify AI in a new tab)Want the best rated?
VicariusRated 4.1 out of 5 in our review, against 4.1 for Seal Security.
Visit (opens Vicarius in a new tab)
At a glance
Green means better than Seal Security, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 Seal SecurityBaseline | 4.1 | Not listed | No | Remediation agent that ships production-ready fixes for open source vulnerabilities | |
| Mobb | 4.0−0.1 | $20/mo | YesSeal Security has none | Fixes security vulnerabilities in code rather than only reporting them. | vs Seal Security |
| Vicarius | 4.1Same | Not listed | No | VRx delivers automated patching, patchless protection and script-based remediation. | vs Seal Security |
 Amplifier Security | 4.0−0.1 | Not listed | No | AI agents that chase security fixes with employees until remediation is confirmed | vs Seal Security |
| Nullify AI | 4.0−0.1 | $67/mo | No | Autonomous AI agent that finds, prioritizes, and fixes code vulnerabilities. | vs Seal Security |
 Superagent | 4.0−0.1 | Free | YesSeal Security has none | An AI security service that finds vulnerabilities in repos, web apps and agents, then fixes them. | vs Seal Security |
 RunSybil | 4.1Same | Not listed | No | Autonomous offensive security that finds exploitable vulnerabilities at development speed. | vs Seal Security |
 ZeroThreat.ai | 4.0−0.1 | $100/mo | YesSeal Security has none | AI-powered DAST scanner checking web apps and APIs against 40,000+ vulnerabilities | vs Seal Security |
| Snyk | 4.3+0.2 | $25/mo | YesSeal Security has none | Filed for a Nasdaq IPO in 2026 at a $7.4 billion valuation | vs Seal Security |
The alternatives in detail
In order of how closely each one matches Seal Security.
Mobb
4.0$20/mo
vs Seal Security−0.1Free plan
Fixes security vulnerabilities in code rather than only reporting them.
- Automatic remediation of scanner findings
- Fixes delivered into the developer workflow
- Works from existing security tooling
Produces fixes rather than adding to a findings backlog
Generated fixes need review before merging
Vicarius
4.1Not listed
vs Seal SecuritySame
VRx delivers automated patching, patchless protection and script-based remediation.
- Automated patching across apps, OS and third-party software
- Patchless protection mitigating vulnerabilities before patching
- Script-based remediation where no packaged fix exists
Patchless protection covers the window where exploitation happens
Patchless mitigation is a stopgap, not a substitute for patching
Amplifier Security
4.0Not listed
vs Seal Security−0.1
AI agents that chase security fixes with employees until remediation is confirmed.
- AI agents that engage employees directly about their own security issues
- Remediation tracking through to verified completion
- Integration with existing detection and endpoint tooling
Attacks the remediation backlog rather than adding more findings
Value depends on already having detection tooling in place
Nullify AI
4.0$67/mo
vs Seal Security−0.1
Autonomous AI agent that finds, prioritizes, and fixes code vulnerabilities.
- Autonomous vulnerability detection, triage, and merge-ready autofix pull requests
- Direct GitHub and Slack integration for repository assessment
- Unlimited repositories and users on the Pro tier rather than seat-based limits
Moves past detection-only scanning by opening autofix pull requests directly
No free tier, so evaluating the product means committing to the $800/year Pro plan
Superagent
4.0Free
vs Seal Security−0.1Free plan
An AI security service that finds vulnerabilities in repos, web apps and agents, then fixes them.
- Finds and fixes vulnerabilities rather than only reporting them
- Covers repositories, web applications and AI agents
- Continuous scanning rather than periodic penetration testing
Delivering fixes removes the step where security work usually stalls
Automated fixes still require review before merging
RunSybil
4.1Not listed
vs Seal SecuritySame
Autonomous offensive security that finds exploitable vulnerabilities at development speed.
- Autonomous offensive testing rather than passive scanning
- Establishes exploitability rather than listing theoretical findings
- Noise elimination so teams triage less
Exploitability turns a backlog into an actionable priority list
Offensive testing requires careful scoping and authorisation
ZeroThreat.ai
4.0$100/mo
vs Seal Security−0.1Free plan
AI-powered DAST scanner checking web apps and APIs against 40,000+ vulnerabilities.
- DAST scanning across web applications and REST APIs
- Library of 40,000+ vulnerability checks
- Vendor-stated 98.9% detection accuracy with low false positives
Free tier lets you scan before committing to a plan
Per-target pricing grows costly across a large application estate
Snyk
4.3$25/mo
vs Seal Security+0.2Free plan
Filed for a Nasdaq IPO in 2026 at a $7.4 billion valuation.
- Scans code, open-source dependencies, containers, and infrastructure-as-config
- Security built directly into developer workflows rather than added afterward
- Roughly $326M in estimated annual recurring revenue as of 2026
Developer-first design fits security scanning into existing coding workflows
Per-developer pricing can add up quickly for larger engineering organizations
FAQ
Questions people ask
Is Seal Security free?
Seal Security does not list a free plan. Check its pricing page for current plans.
What is the best free alternative to Seal Security?
Snyk is the highest-rated alternative here with a free plan (4.3 out of 5). Other free options: Mobb, Superagent, ZeroThreat.ai.
What is the cheapest alternative to Seal Security?
Among paid plans, Mobb has the lowest starting price (from $20/mo). If you need it free, start with Snyk.
How did you pick these alternatives?
We match tools on what they do, their category and their price, using the details in our directory. Ratings come from our reviews and reader reviews.