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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 October 2025, in the Mainframes category, the mindshare of Fujitsu Server GS21 is 25.2%, down from 27.4% compared to the previous year. The mindshare of IBM Z is 38.5%, up from 38.7% compared to the previous year. The mindshare of Unisys ClearPath Libra is 11.1%, up from 8.6% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Mainframes Market Share Distribution
ProductMarket Share (%)
IBM Z38.5%
Fujitsu Server GS2125.2%
Unisys ClearPath Libra11.1%
Other25.200000000000003%
Mainframes
 

Featured Reviews

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DS
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
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
Financial Services Firm
11%
Computer Software Company
8%
Government
8%
Manufacturing Company
8%
Financial Services Firm
15%
Computer Software Company
12%
Educational Organization
7%
Retailer
7%
No data available
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
No data available
No data available
No data available
 

Also Known As

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

Overview

Information not available
 

Sample Customers

Information Not Available
Fujitsu
Information Not Available