--- title: STunnel Reviews meta\_title: 'STunnel Reviews 2026: Details, Pricing, & Features | G2' meta\_description: Filter reviews by the users' company size, role or industry to find out how STunnel works for a business like yours. aggregate\_rating: rating\_value: 3.9 review\_count: 5 scale: '5' date\_modified: '2026-07-17' parent\_category: name: Confidentiality url: https://www.g2.com/categories/confidentiality --- # STunnel Reviews & Product Details Stunnel is a proxy designed to add TLS encryption functionality to existing clients and servers without any changes in the programs' code. * * * Seller [STunnel](https://www.g2.com/sellers/stunnel) Discussions [STunnel Community](https://www.g2.com/products/stunnel/discuss) Show More ## Top-Rated Alternatives [ ![Keeper Password Manager](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Keeper Password Manager") Keeper Password Manager 4.6/5(1,235) ](https://www.g2.com/products/keeper-password-manager/reviews) [ ![Progress MOVEit](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Progress MOVEit") Progress MOVEit 4.4/5(529) ](https://www.g2.com/products/progress-moveit/reviews) [ ![Signal](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Signal") Signal 4.4/5(454) ](https://www.g2.com/products/open-whisper-systems-signal/reviews) [ View All Alternatives ](https://www.g2.com/products/stunnel/competitors/alternatives) ## User Insights Average based on 5 real user reviews. [Log in to unlock pricing and user insights](/login) ![Verified User in Computer Software](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User in Computer Software") UC Verified User in Computer Software Enterprise (\> 1000 emp.) 10/7/2024 "Reliable and efficient way to add ssl to legacy applications" 3/5 What do you like best about STunnel? It's really user-friendly and offers a straightforward way to add a security layer to your application, enabling SSL capabilities. Plus, it's open source, which makes it even more accessible, especially with the excellent documentation available. It relies on OpenSSL under the hood, which is a huge advantage for compatibility. Overall, it's a solid choice for anyone looking to enhance security of their applications. Review collected by and hosted on G2.com. What do you dislike about STunnel? There’s been a bit of a drop in performance for the application because of the encryption layer. The initial setup can be a little tricky since you really need to understand the documentation, as everything has to be configured in the stunnel.conf file. Also, it only focuses on encrypting traffic and doesn’t offer any features for intrusion detection or prevention, which is a bit of a downside. Review collected by and hosted on G2.com. What problems is STunnel solving and how is that benefiting you? It lets us wrap our legacy application and use an encrypted connection with the OpenSSL library, so there's no need to change the application itself. Review collected by and hosted on G2.com. Show More Current UserValidated ReviewerIncentivizedSource: G2 invite ![Verified User in Information Technology and Services](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User in Information Technology and Services") UI Verified User in Information Technology and Services Mid-Market (51-1000 emp.) 10/12/2024 "Stunnel is Awesome!" 3.5/5 What do you like best about STunnel? Strong TLS encryption is a feature that Stunnel excels at offering for outdated protocols. It boosts security without changing already-existing apps. It is quite easy to use and provides a clear method for adding a security layer and turning on SSL capabilities to your application. Furthermore, because of the available documentation, it is much more accessible because it is open source. The fact that OpenSSL is used internally is a major compatibility benefit. For those wishing to improve the security of their apps, it's an excellent option all around. Review collected by and hosted on G2.com. What do you dislike about STunnel? The performance overhead of Stunnel can be substantial because of its cryptographic processing. High connection traffic throughput may be impacted by this. It took some getting used to and required some searching on forums and internet, but once that was done, it worked perfectly! Review collected by and hosted on G2.com. What problems is STunnel solving and how is that benefiting you? Through the protection of sensitive data communications, tunnel enhances privacy. It allows for safe communication across systems that are incompatible without changing already-running apps. Review collected by and hosted on G2.com. Show More Validated ReviewerIncentivizedSource: G2 invite ![Dhaval S.](/assets/transparent-ad5be28fbcd25b7b08d2cebe1d957125437fb5407d75ee717965ad22c8808791.gif "Dhaval S.") DS Dhaval S. Business Analyst Small-Business (50 or fewer emp.) 10/9/2024 "Simplifying Secure Data Transport Using STunnel" 4.5/5 What do you like best about STunnel? STunnel services to TLS Encryption provides a lightweight yet powerful solution to efficiently secure non-TLS protocols in a variety of environments. Review collected by and hosted on G2.com. What do you dislike about STunnel? Using Stunnel in a chroot environment requires additional configuration steps to ensure TCP Wrappers work properly. Review collected by and hosted on G2.com. What problems is STunnel solving and how is that benefiting you? Stunnel enables TLS encryption for current clients and servers without requiring any code modifications, which facilitates secure communication for untrusted network also. Review collected by and hosted on G2.com. Show More 11/6/2024 Current UserValidated ReviewerIncentivizedSource: G2 invite DK Dhaval K. Technology Analyst Small-Business (50 or fewer emp.) 10/6/2024 "STunnel Role in Securing Client-Server Architecture" 3.5/5 What do you like best about STunnel? Stunnel is excellent at providing strong TLS encryption for legacy protocols. Increase security without modifying existing applications. Review collected by and hosted on G2.com. What do you dislike about STunnel? Stunnel's performance overhead can be significant due to cryptographic processing. This may affect the throughput of high connection volumes. Review collected by and hosted on G2.com. What problems is STunnel solving and how is that benefiting you? Stunnel increases privacy by protecting sensitive data communications. Enables secure communication between incompatible systems without modifying existing applications. Review collected by and hosted on G2.com. Show More Current UserValidated ReviewerIncentivizedSource: G2 invite ![Verified User in Computer Software](/assets/icons/anonymous-avatar-purple-4ae1032bdb50ee5682003170c8184aee790d25958bd397abbd384ba52c596a7b.svg "Verified User in Computer Software") AC Verified User in Computer Software Small-Business (50 or fewer emp.) 5/16/2018 "stunnel is great!" 5/5 What do you like best about STunnel? that STunnel gave me the ability to use needed old software with SSL Review collected by and hosted on G2.com. What do you dislike about STunnel? the configuration was a little annoying and not easy, I had to google and search on their forums, but after that it was great! Review collected by and hosted on G2.com. Recommendations to others considering STunnel: I recommend the use of Stunnel definitely!! Review collected by and hosted on G2.com. What problems is STunnel solving and how is that benefiting you? We had an older software that uses POP but does not use SSL, STunnel allowed us to "trick" the software into using SSL and allowing us to have secure mail Review collected by and hosted on G2.com. Show More Current UserValidated ReviewerIncentivizedSource: G2 invite ## Questions about STunnel? Ask real users or explore answers from the community Get practical answers, real workflows, and honest pros and cons from the G2 community or share your insights. [ Ask about STunnel ](https://www.g2.com/products/stunnel/discussions/new) GU Guest User What is STunnel used for? 0 Upvotes 0 [ Join the conversation ](https://www.g2.com/discussions/what-is-stunnel-used-for) [ View all Discussions ](https://www.g2.com/products/stunnel/discuss) ##### Pricing Pricing details for this product isn’t currently available. Visit the vendor’s website to learn more. [ View More Pricing Information ](https://www.g2.com/products/stunnel/pricing) ## Work at STunnel? 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