Cobalt helped establish the modern PTaaS category and publicly emphasises a large vetted tester community and broad platform. Pentestly offers a more compact alternative built around in-house delivery, AI-assisted exploration and direct tester continuity.
This is an independent comparison based on public information, not a paid ranking. Features and terms can change; confirm them directly with each provider.
Consider Pentestly if you prefer an in-house team, direct continuity and a UK-focused partner. Consider Cobalt if access to its larger global tester community, broader service catalogue or enterprise platform footprint is the stronger requirement.
Cobalt's public service pages describe PTaaS delivered through a global community of vetted experts, supported by a platform covering penetration testing, red teaming, DAST and attack-surface management.
Source reviewed: Cobalt penetration testing services| Decision area | Cobalt | Pentestly |
|---|---|---|
| Tester model | Publicly backed by a community of more than 500 vetted security experts. | Delivered by Pentestly's in-house testing team with a named engagement owner. |
| Platform scope | A broad offensive-security platform including PTaaS, DAST and ASM capabilities. | A focused commercial and delivery system for proposals, pentests, findings and retesting. |
| AI role | Publicly combines human expertise with AI automation across modern pentesting services. | Bespoke AI testing agents expand the hypotheses an assigned tester can investigate and verify. |
| Continuity | Teams are assembled from its vetted community according to engagement needs. | Continuity and direct access to the in-house delivery team are central to the model. |
| Best question to ask | How are testers selected, quality-controlled and retained for repeat engagements? | Who owns the engagement, and how will AI-assisted work be evidenced and reviewed? |
The clearest difference is the delivery model. Cobalt publicly centres a large vetted expert community; Pentestly centres an in-house team working with bespoke AI agents and a managed client portal.
Team size alone does not determine test quality. Compare relevant experience, scheduling capacity, threat-model depth, time allocated, peer review and whether reported issues are manually proven.
Discuss your current report formats and required history during scoping. Migration requirements should be agreed explicitly so identifiers, evidence, remediation state and tenant permissions are preserved correctly.
Speak directly with the team that will scope and deliver your engagement. Clear boundaries, practical answers and no sales runaround.