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Fujitsu Server GS21 vs IBM Z vs Unisys ClearPath Libra comparison

Review summaries and opinions

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

Mindshare comparison

As of April 2026, in the Mainframes category, the mindshare of Fujitsu Server GS21 is 20.3%, down from 28.2% compared to the previous year. The mindshare of IBM Z is 33.6%, down from 39.2% compared to the previous year. The mindshare of Unisys ClearPath Libra is 14.1%, up from 10.4% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Mainframes Mindshare Distribution
ProductMindshare (%)
IBM Z33.6%
Fujitsu Server GS2120.3%
Unisys ClearPath Libra14.1%
Other32.0%
Mainframes
 

Featured Reviews

Use Fujitsu Server GS21?
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DS
Manager CICS Support at Blue Cross Blue Shield of Illinois
Provides processing of mission critical applications.
Batch DB Online systems. Provides processing of mission critical applications. Ability to handle heavy mixed workloads. More graphical, user-friendly, interface for systems changes. However, IBM is attempting to do this via OSMF.
JS
Former Associate Dean of Enterprise Systems at PASCO HERNANDO STATE COLLEGE
Powerful system, familiar interface, and helpful support
The most valuable feature of Unisys ClearPath Libra is the power of the system. There can be hundreds, maybe even thousands of users using the system at the same time, as well as batch jobs. The ability to look at file structures on the Unisys ClearPath Libra, as if it were a Microsoft Windows file share, has been easy to use for our users and the people in the technology department. The database structure was proprietary software that runs on the Unisys ClearPath Libra on the mainframe. We were able to look at the database and the data within it as if it was a SQL database, and we were able to pull data away with the latest, greatest tools on the Microsoft Windows platform.
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Top Industries

By visitors reading reviews
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Financial Services Firm
13%
Government
11%
Computer Software Company
8%
Media Company
8%
No data available
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
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Also Known As

GS21 2400, GS21 2600
No data available
ClearPath Forward Libra 8400 Series, ClearPath Forward Libra 6400 Series
 

Overview

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Sample Customers

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Fujitsu
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