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Sentinel

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Continuously pentest applications with AI agents and reproducible exploit validation.

Free trialAI Developer ToolsAI Agents

Verified Nov 2, 2026

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What is Sentinel?

Sentinel is an autonomous AI security agent for testing web applications, APIs, and internal systems. It explores potential attack paths and validates vulnerabilities through controlled exploit reproduction before reporting them. It is designed to support security engineers and pentesters rather than replace architecture reviews, threat modelling, or remediation decisions.

Users start with a domain, repository, or API specification, then configure testing boundaries, authentication, and relevant context. A coordinator maps the attack surface and assigns focused tasks to parallel agents. Testing covers issues such as SQL injection, server-side request forgery, authorization flaws, and business-logic vulnerabilities, as well as prompt injection and tool-call abuse in LLM-powered features.

Findings include reproduction steps, request and response details, affected scope, and suggested fixes. Results can flow into Jira, Linear, or GitHub Issues, with tests triggered through CI or run continuously. Controls include read-only validation challenges, rate limits, scoped credentials, action logs, and an emergency stop. Deployment options include SaaS, dedicated tenants, in-VPC installations, and air-gapped builds.

What can Sentinel do?

  • Parallel security testing

    A coordinator assigns focused attack objectives to parallel agents across application endpoints and authentication boundaries.

  • Reproducible exploit validation

    Deterministic validators reproduce findings through controlled challenges before adding them to the reporting queue.

  • Developer-ready findings

    Reports include reproduction steps, requests and responses, affected scope, and patch suggestions.

  • Continuous SDLC testing

    Trigger tests from CI on merges or run continuously against staging and production environments.

  • Scoped testing controls

    Set rate limits, testing boundaries, scoped credentials, and an instant stop, with agent actions logged for review.

  • AI application testing

    Test LLM-powered features for prompt injection, tool-call abuse, and data exfiltration risks.

Who is Sentinel for?

Application security teams
Continuously test applications and prioritize reproducible vulnerabilities for remediation.
Platform and engineering teams
Integrate security testing into CI and receive actionable findings in existing issue trackers.
Security leaders
Review testing evidence and export signed exploit traces for compliance and customer security reviews.

How much is Sentinel?

Official pricing

  • Personal/Hobby

    $252/yr

  • Businesses and Teams

    $504/yr

  • Enterprise

    See website

Free plan: A three-day trial is included with Donely's Personal/Hobby plan.

Frequently asked questions

What systems can Sentinel test?

Sentinel supports public web applications, internal applications through a deployed runner, REST and GraphQL APIs, mobile backends, and LLM-powered features.

What controls are available for production testing?

Sentinel provides read-only validation challenges, rate limits, configurable testing boundaries, scoped credentials, action logging, and an emergency stop.

Can Sentinel run inside our infrastructure?

Deployment options include SaaS, a dedicated tenant, and in-VPC installations. Air-gapped builds are available for regulated workloads.

How does it fit into a development workflow?

Tests can run from CI on merges to main or continuously against staging and production. Validated findings can be sent to Jira, Linear, or GitHub Issues.

What plans does Donely list?

Donely lists Personal/Hobby at $21 per month, billed yearly at $252, and Businesses and Teams at $42 per month, billed yearly at $504. Personal/Hobby includes a three-day trial, and Enterprise has custom pricing.

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