Duo Security vs ExpressVPN vs OpenVPN vs Rhombus Systems
| Attribute | ||||
|---|---|---|---|---|
| Category | Cybersecurity | Cybersecurity | Cybersecurity | Cybersecurity |
| Pricing | Free tier | Paid | Free tier | Paid |
| Starting price | $3/month | $3.49/month | $7/month | $149/year |
| Free tier | Yes | No | Yes | No |
| Free trial | Yes | Yes | Yes | Yes |
| Deployment | — | — | — | — |
| API available | Unknown | Unknown | Unknown | Unknown |
| Platforms | — | — | — | — |
| Certifications | — | — | — | — |
| Integrations | — | — | — | — |
| Company | — | — | Founded 2002 | — |
| Feature attributes | ||||
Also consider
Unknown values show as “Unknown”/“—”. Nothing is inferred — see each tool page for sources.