New: Pressure test your SOC 2 report against buyer requirements
Free check
Fencer and Terra Security are both agentic AI pen testers, but they draw the human line differently. Terra keeps a human on the loop: its agents pause for human sign-off on intrusive or production actions, and its remediation generates a firewall or WAF rule for a human to deploy. Fencer runs the full test autonomously and applies the fix in the code and cloud, opening pull requests and correcting cloud misconfigurations through the provider API, at published pricing. Terra markets human validation as trust for auditors; Fencer’s answer is proven exploits, complete logs, exploit-gated severity, and applied fixes, trust without the human bottleneck.
Lean software teams that want fully autonomous testing that fixes root cause in code and cloud, at a published price.
Enterprises that need a named human to sign off on production testing, or first-class testing of their own AI systems.
Both are agentic, so the real question is where the human sits. Terra’s agents pause for human sign-off on intrusive or production actions.
After proving an exploit, a tool either fixes the root cause or adds a control in front of it. This is a sharp difference.
Testing your own AI systems is a real and growing need, and it is a genuine Terra strength.
Both aim to be trustworthy. Terra’s answer is a human signature; Fencer’s is verifiable evidence.
Whether pricing is published tells a lean team if it can evaluate without a sales cycle.
| Criterion | Fencer | Terra Security |
|---|---|---|
| Autonomy | Fully autonomous, no human bottleneck | Human-on-the-loop, pauses for sign-off |
| Remediation | Applies root-cause fixes: pull requests and cloud corrections | Generates a firewall or WAF rule for a human to deploy |
| AI-systems testing | Opportunistic, not a core focus | First-class surface |
| Attack surface | Whole software stack, including code and dependencies | Web, network, internal, and AI systems |
| Trust model | Proof, logs, and exploit-gated severity | Human sign-off on intrusive actions |
| Pricing | Published, $3,000 or included on platform plans | Demo only, custom-scoped |
| Built for | Lean software teams | Enterprise security and compliance teams |
Fencer is the better fit for a lean software team that wants autonomous testing to fix the root cause in code and cloud, backed by verifiable proof and logs, at a published price.
Terra Security is the better fit for an enterprise that needs a named human to sign off on production testing, or first-class testing of its own AI systems.
Fencer runs autonomous AI penetration tests that prove what is actually exploitable, then fix what they find, opening pull requests for code and correcting cloud misconfigurations through the provider API, and re-testing to confirm. The pen test lives in the same platform that scans and secures the rest of your stack, at published pricing, built to run without a dedicated security engineer.
