SASE and ZTNA show up together in every modern network-security conversation, but they are not the same. Understanding the difference stops you from overbuying and, more importantly, helps you pick the right architecture for your business.

Quick definitions

ZTNA (Zero Trust Network Access): remote-access model that authenticates identity + device + context for each application, replacing the VPN.
SASE (Secure Access Service Edge): umbrella architecture combining network and security as a service from the cloud. Includes SD-WAN, SWG, CASB, FWaaS and ZTNA as one of its pillars.

In one line: ZTNA is a component; SASE is the full model.

Technical comparison

Aspect	ZTNA	SASE
Scope	Per-application remote access	Full network (WAN, offices, remote, SaaS)
Focus	Replace the VPN	Replace MPLS, VPN and perimeter firewall
Components	Broker, agent, IdP	ZTNA + SWG + CASB + FWaaS + SD-WAN
Complexity	Low/medium	High
Typical cost	€5–15/user/month	€20–60/user/month
Deployment time	Days	Weeks or months
Ideal for	SMEs, clinics, multi-site	Large enterprises with MPLS and many sites

When to choose ZTNA

Choose ZTNA if:

Your main problem is remote work, slow VPN or access to internal apps.
You have 10 to 500 users.
You need NIS2, ENS or ISO 27001 compliance on access controls.
You don't need SD-WAN yet.
You want results in days, not months.

The ConnectaSec platform is a pure ZTNA example: dedicated gateway, fixed public IP, no hardware, ENS/GDPR compliance.

When to choose SASE

Choose SASE if:

You have many sites on MPLS that no longer pays off.
You need web inspection (SWG) and SaaS control (CASB) for thousands of users.
Your yearly network/security spend exceeds €100,000.
You can absorb a 6–12 month rollout with an integrator.

Evaluating alternatives? See our Zscaler alternative and Cloudflare Access alternative.

Can they be combined?

Yes. Many SMEs start with ZTNA to fix remote access and add SWG/CASB as they grow. The transition is smooth if the ZTNA follows open standards.

Our advice: don't buy full SASE if your problem is the VPN. Start with ZTNA and stack layers.

SASE, ZTNA and NIS2

Both models help with NIS2 compliance. See our NIS2 SME guide.

FAQ

Does ZTNA replace the firewall? No. It replaces the VPN concentrator and reduces perimeter-firewall dependency, but the firewall still has a job.

Is SASE always better? No. For a 30-person company SASE is overkill.

How long does VPN → ZTNA migration take? 1–4 weeks for an SME. See our migration guide.

Not sure which model fits best? Request a demo — no commitment.