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Certes Layer 4 vs OpenVPN Access Server comparison

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Comparison Buyer's Guide

Executive Summary

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

Categories and Ranking

Certes Layer 4
Ranking in ZTNA
24th
Average Rating
0.0
Number of Reviews
0
Ranking in other categories
No ranking in other categories
OpenVPN Access Server
Ranking in ZTNA
9th
Average Rating
8.4
Reviews Sentiment
6.8
Number of Reviews
71
Ranking in other categories
Enterprise Infrastructure VPN (1st)
 

Mindshare comparison

As of October 2026, in the ZTNA category, the mindshare of Certes Layer 4 is 1.0%, up from 0.2% compared to the previous year. The mindshare of OpenVPN Access Server is 3.2%, down from 5.4% compared to the previous year. It is calculated based on PeerSpot user engagement data.
ZTNA Mindshare Distribution
ProductMindshare (%)
OpenVPN Access Server3.2%
Certes Layer 41.0%
Other95.8%
ZTNA
 

Featured Reviews

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AS
Network operation center engineer at a computer software company with 10,001+ employees
Secure remote access has protected critical data and now simplifies role-based user management
An area for improvement is the pricing model. The concurrent user licenses get expensive pretty quickly as your organization grows, so more flexible pricing options would be a huge plus. Another area is configurational disconnect. While the admin web UI handles about 90% of what you need, the moment you have to do deep, advanced routing customization, you still have to drop back to the command line interface to make those changes. It would be great to see those deeper configurations completely integrated into the web portal. Lastly, it would be awesome to see native support for newer, lighter protocols through WireGuard built straight into the platform alongside standard OpenVPN for better performance efficiency.
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Top Industries

By visitors reading reviews
No data available
Comms Service Provider
11%
Outsourcing Company
11%
Computer Software Company
10%
Financial Services Firm
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
By reviewers
Company SizeCount
Small Business45
Midsize Enterprise14
Large Enterprise25
 

Questions from the Community

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How does Fortinet FortiClient compare with Open VPN Access Server?
Fortinet FortiClient is a feature-rich solution that is easy to use and deploy without sacrificing safety and security. It has a very fast connection rate and has a built-in VPN. With this solution...
What is your experience regarding pricing and costs for OpenVPN Access Server?
The pricing and setup costs for OpenVPN Access Server are on the high side since licenses are not user-dependent but based on the number of connections established. With two free simultaneous conne...
What needs improvement with OpenVPN Access Server?
There are definitely areas for improvement. A broader network level access faces challenges, and the clustering configuration seems insufficient, posing a single point of failure. Moreover, patch m...
 

Also Known As

Certes CryptoFlow, Certes CryptoFlow Net Creator
OpenVPN
 

Overview

 

Sample Customers

Information Not Available
Verizon, Amazon, Disney, HP, Microsoft, IBM, Samsung
Find out what your peers are saying about Fortinet, Tailscale, Cloudflare and others in ZTNA. Updated: September 2026.
915,287 professionals have used our research since 2012.