Cloud provider security tools or third-party tools: how do you choose?

Choose by your estate, not by a category label. Cloud provider security tools integrate tightly with one platform and are quick to switch on. Third-party tools can cover several clouds, SaaS and on-premises systems with one policy and one view. Most mature teams end up using both, with a clear owner for each job.

What does the shared responsibility model leave to you?

The UK NCSC explains that security and availability in a cloud service is a joint responsibility between provider and customer, and that how much falls to each depends on the type of service. The provider almost always handles availability and physical protection of its servers. What you own varies by service model, and it always includes your data, your identities and your configuration.

The NCSC even advises ceding as much security responsibility as possible to a trusted provider, since it is better placed to manage it. That is a reason to use the provider's built-in controls first: encryption services, identity and access management, network controls and logging. The question of third-party tools is about what remains after that.

What are provider tools good at?

• Depth on one platform. They see the platform's internal telemetry and new services early.
• Low friction. Enabling a service in an account is a setting, not a project.
• Billing and procurement. Often one contract.
• Native integration. Findings can trigger platform automation without glue code.

What are third-party tools good at?

• Multiple clouds. One policy language and one inventory across providers.
• Independence. A second set of eyes that does not share the platform's blind spots or its commercial interest.
• Beyond infrastructure. Coverage for code, containers, SaaS or endpoints that provider tools do not reach.
• Portability. Rules and evidence are not tied to one provider if you move workloads.

What are the risks of each?

A constructed example: a company runs most workloads on one provider and a smaller analytics system on another. Native tools give excellent coverage on the first and nothing on the second. The security team sees two dashboards, two alert formats and two sets of rules. A third-party tool unifies them, but its agent has broad read access to both accounts and becomes a target itself.

• Provider tools: coverage stops at the platform boundary, and differences between providers mean duplicated work.
• Third-party tools: extra access, extra cost, lag on brand new services, and another system to maintain.
• Both: overlapping alerts. Decide which tool owns which finding type, or the same issue pages three people.

How should you decide?

Ask these questions in order:

1. How many clouds, SaaS platforms and on-premises systems must be covered, now and in two years?
2. What can the native tools already do that you have not turned on?
3. Where are your gaps: configuration, data, workloads, code, identity?
4. Do you have staff to run one more platform?
5. What access does the tool need, and how is that access limited and audited?
6. How does the tool export data, so you can leave?

Fix the cheap native gaps first. NIST SP 800-215 on enterprise networks follows a similar path: it first covers individual point security tools, then frameworks such as zero trust network access that tie them together. Use that as a test: does the proposed tool give you consistency across your estate that you do not already have?

How to check or apply this

1. Inventory accounts, subscriptions, SaaS services and on-premises systems.
2. Switch on and review the provider's own security services, and note the gaps.
3. Map each gap to a requirement, owner and deadline.
4. Pilot a third-party option against one specific gap, with measurable success criteria.
5. Review the access the tool needs and apply least privilege.
6. Assign one tool as owner of each finding type, and retire duplicate alerts.

Quick check

Sources

• NCSC, Cloud security shared responsibility model
• NIST SP 800-215, Guide to a Secure Enterprise Network Landscape

Last reviewed: 18 October 2026.