strongSwan
strongSwan: A flexible, standards-based IPsec VPN for teams with strong technical administration skills. Ranked #71 of 90 in Business VPN Software by our editors (3.0/10); pricing: Free plan; best for technical teams building standards-based IPsec VPNs.
At a glance
- Editor score3.0 / 10
- PricingFree plan
- Best forTechnical teams building standards-based IPsec VPNs
- Free planYes
- Paid fromFree
- Founded2005
- Facts checked22 Sep 2026
Where it wins
- Supports remote-access, host-to-host, and site-to-site VPNs
- Offers EAP, X.509, pre-shared-key, RADIUS, and SQL authentication
- Runs across Windows, macOS, Linux, iOS, Android, and self-hosted environments
Where it doesn't
- Requires a more technical deployment approach
- Configuration options may demand experienced administrators
- Commercial licensing and support require direct contact
Our verdict on strongSwan
strongSwan is an open-source implementation of Internet Key Exchange protocols for policy-based and route-based IPsec VPNs. It can operate as a VPN client or gateway for remote-access, host-to-host, and site-to-site connections. The product is aimed at technically capable administrators securing connections across servers, networks, and mobile devices, rather than teams looking for a simplified, consumer-style VPN service.
Its main strength is protocol and configuration depth. strongSwan supports both IKEv1 and IKEv2, along with EAP, X.509 certificate, and pre-shared-key authentication. RADIUS and SQL-backed authentication or configuration support can fit established identity and administration workflows. The modular plugin architecture extends its deployment options, while certificate revocation, OCSP, and Trusted Network Connect endpoint posture assessment add controls for authentication and device assessment. Logging can be configured for files, syslog, systemd, or SQL. Integrations with NetworkManager, TPM 2.0, and PKCS #11 smartcards further support standards-based environments.
The software is free and open source, with support for Windows, macOS, Linux, iOS, Android, and self-hosted deployments. Its broad platform coverage and support for advanced administrative controls make it a strong fit for organizations designing their own IPsec standards and network policies. The trade-off is deployment effort: the range of protocols, authentication methods, plugins, and logging choices calls for administrators who can manage a technical VPN implementation. Teams that need detailed control, posture assessment, and site-to-site connectivity should consider strongSwan; teams prioritizing a simpler setup should look for a less configuration-intensive alternative.
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strongSwan pricing
strongSwan fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| SSO / SCIM | Not verified |
| Device posture | Yes |
| Site-to-site networking | Yes |
| Admin control level | Advanced |
| Access model | Vpn |
| Audit logs | Yes |
| Supported platforms | Linux, Android, FreeBSD, macOS, iOS, Windows |
| Deployment | Self-hosted |
| Platforms | Windows, macOS, Linux, iOS, Android |
| Support | Email, Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 5 integrations: RADIUS, SQL, NetworkManager, TPM 2.0, PKCS #11 smartcards |
| Pricing | Free plan |
| Website | strongswan.org |
| Facts checked | 22 Sep 2026 |
strongSwan integrations
strongSwan lists 5 integrations on its own site.
- RADIUS
- SQL
- NetworkManager
- TPM 2.0
- PKCS #11 smartcards
Alternatives to strongSwan
- OpenVPN CloudConnexaA managed business VPN with zero-trust controls, posture checks, and cloud networking.9.3
- OpenVPN Access ServerA flexible self-hosted VPN for organizations needing deep access and authentication controls.9.2
- Azure VPN GatewayA strong Azure-centered VPN gateway for hybrid networks, with usage-based pricing and tiered limits.9.1
See all strongSwan alternatives →
Also Ranked In
strongSwan is ranked in 3 of our directories.
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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