KerioConnect vs ProtonMail comparison

GFI and Proton Technologies are both solutions in the Email Applications category. GFI is ranked #8 with an average rating of 8.3, while Proton Technologies is ranked #10 with an average rating of 9.0. GFI holds a 4.8% mindshare in EA, compared to Proton Technologies’s 4.2% mindshare. Additionally, 57% of GFI users are willing to recommend the solution, compared to 50% of Proton Technologies users who would recommend it.

KerioConnect

Read 10 KerioConnect reviews

1,906 Views
1,029 Comparison Views

57% willing to recommend

ProtonMail

Read 1 ProtonMail review

1,079 Views
999 Comparison Views

50% willing to recommend

KerioConnect

ProtonMail

Comparison Buyer's Guide

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Executive Summary

We performed a comparison between KerioConnect and ProtonMail based on real PeerSpot user reviews.

Find out what your peers are saying about Google, Microsoft, Amazon Web Services (AWS) and others in Email Applications.

To learn more, read our detailed Email Applications Report (Updated: March 2025).

Buyer's Guide

Email Applications

March 2025

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Helped 842,651 peers since 2012

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

KerioConnect

Ranking in Email Applications

8th

Average Rating

6.8

Reviews Sentiment

7.9

Number of Reviews

Ranking in other categories

Email Archiving (7th)

ProtonMail

Ranking in Email Applications

10th

Average Rating

9.0

Number of Reviews

Ranking in other categories

No ranking in other categories

Mindshare comparison

As of March 2025, in the Email Applications category, the mindshare of KerioConnect is 4.8%, up from 3.9% compared to the previous year. The mindshare of ProtonMail is 4.2%, up from 4.0% compared to the previous year. It is calculated based on PeerSpot user engagement data.

Email Applications

Featured Reviews

David Bloomer

Senior Technician at Computers At Work

Lightweight, simple, and robust; easy to maintain and doesn't require a lot of system resources to run

Kerio Connect does as advertised, so there are no real issues with the product itself. It's developed regularly, so there are constant updates. Possibly, the support and development have lessened since they've sold the company, but as far as the product itself is concerned, there isn't anything that I would suggest needs improvement. If I'm being picky, Kerio Connect uses a proprietary, mappy atom for Outlook, and it would be nice if they used a native mappy connection instead, but that's the only additional feature that I would like to see in its next release. If they have native Outlook map integration, that would be great, but other than that, it's got all the functions that I think a mail server should have.

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Vitor Vicente

Works

Secure email communication facilitates safe financial exchanges and enhances data privacy

I use ProtonMail for exchanging invoicing with clients, managing financial information, and receiving notifications from bank accounts and investment brokers. It's dedicated to high-importance communication involving financial information The auto encryption of attachments is valuable. ProtonMail…

Read full review

Quotes from Members

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

Pros

"The solution is easy to maintain, unlike Exchange. It's easy to create multiple domains and back up and restore if needed. It also has good security features like anti-spam and antivirus."

"It's relatively simple to use."

"The most valuable features are security and privacy because you installed it on your server, within your company premises, not in the cloud."

"The most valuable features are its ease of use, excellent pricing, and it is platform agnostic."

"We have contacted technical support a handful of times and received some assistance."

"The user interface is good."

"KerioConnect has integration with 365. We can use Outlook, which has its client and can be used with Apple devices. It integrates with the App Store and Microsoft Office. It has a smart router. The spam filtering and antivirus are good."

"Kerio Connect is secure, flexible, and easy to control from the user interface. It has many security features able to be controlled from one place, such as anti-spam. I have found it very convenient. Additionally, you can analyze log files and share folders which is helpful."

More KerioConnect pros

"The auto encryption of attachments is valuable."

Cons

"KerioConnect is stable as long as you use a strong password."

"The solution could improve the redundancy because we only have one copy of the Kerio Connect server on our hardware. The next step for us is to move to the cloud and if Kerio does not have a cloud version available they should release one"

"You cannot integrate with other services like Google Docs, Google Assistant, Google Calendar, etc."

"We are considering switching to Microsoft Exchange. One reason is that it doesn't improve our workflow and doesn't integrate well with Microsoft 365 applications."

"KerioConnect continues to improve with regular updates throughout the year. They must be added to the roadmap, which requires approval."

"It could be simpler to use and install, but I still wouldn't use it because there isn't a compelling use case."

"I would like to see better support from their support team."

"Most of our clients use Outlook and Kerio Connect. Occasionally, Kerio can be a bit slow. They could make it faster to get onto the web interface without so much load time. It's just slow with Outlook, however, for some reason."

More KerioConnect cons

"One improvement could be the integration between ProtonMail and Proton Pass, allowing sharing of specific secrets via email."

Pricing and Cost Advice

"The pricing is about $3 per mailbox per month."

"The solution's pricing depends on how long you plan to keep it because you pay on a per-year basis. You might have a one-time setup cost for something like Microsoft Exchange or a Linux mail server. I'd say this solution is expensive on a per-year basis, almost 2000-3000 dollars annually. It doesn't seem to pay off yet, so we're considering switching to another product."

"KerioConnect has a first-time cost and yearly subscription. It is not expensive."

"The price of Kerio Connect is better when comparing it to others solutions."

Information not available

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Top Industries

By visitors reading reviews

Computer Software Company

16%

Comms Service Provider

13%

Government

Educational Organization

Computer Software Company

14%

Educational Organization

12%

Comms Service Provider

11%

Government

Company Size

By reviewers

Large Enterprise

Midsize Enterprise

Small Business

No data available

Questions from the Community

What do you like most about KerioConnect?

The most valuable features are security and privacy because you installed it on your server, within your company premises, not in the cloud.

See all answers

What is your experience regarding pricing and costs for KerioConnect?

KerioConnect has a first-time cost and yearly subscription. It is not expensive.

See all answers

What needs improvement with KerioConnect?

KerioConnect continues to improve with regular updates throughout the year. They must be added to the roadmap, which requires approval. In larger organizations, the server's capabilities and the da...

See all answers

What is your experience regarding pricing and costs for ProtonMail?

The pricing is competitive, offering good value on the average plan. It’s approximately $100 for annual billing.

See all answers

What needs improvement with ProtonMail?

The UI was previously cumbersome, however, it has improved. One improvement could be the integration between ProtonMail and Proton Pass, allowing sharing of specific secrets via email. However, thi...

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What is your primary use case for ProtonMail?

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Comparisons

Microsoft Exchange vs KerioConnect

Compared 51% of the time

Zimbra Collaboration vs KerioConnect

Compared 30% of the time

IceWarp vs KerioConnect

Compared 8% of the time

Microsoft Exchange Online vs KerioConnect

Compared 7% of the time

Google Workspace vs KerioConnect

Compared 4% of the time

More KerioConnect Competitors

Google Workspace vs ProtonMail

Compared 46% of the time

Zoho Mail vs ProtonMail

Compared 17% of the time

Microsoft Exchange vs ProtonMail

Compared 13% of the time

Microsoft Exchange Online vs ProtonMail

Compared 12% of the time

Amazon WorkMail vs ProtonMail

Compared 5% of the time

More ProtonMail Competitors

Product Reports

Buyer's Guide

KerioConnect

March 2025

Download KerioConnect product report

Buyer's Guide

Email Applications

March 2025

Download ProtonMail product report

Overview

Kerio Connect, a messaging and collaboration solution, meets the needs of small and mid-sized businesses while offering a robust feature lineup. Business users enjoy support for their favorite email client and easy web-based access. Kerio Connect is highly stable—so you can focus on business rather than unexpected downtime and recovery.

GFI

ProtonMail is the world‘s largest encrypted email provider, with over 11 million users trusting us to secure their data every day. We are the email service of choice for security-conscious enterprises.

Proton Technologies

Sample Customers

Southern Tier Brewing Company, Innotta, Baustoff + Metall, Hamifleurs, Chanson TV, Ryman Stationery

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Find out what your peers are saying about Google, Microsoft, Amazon Web Services (AWS) and others in Email Applications. Updated: March 2025.

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