Aim: The purpose of this study was comparing Information Retrieval Capabilities in Web-based Library Software of Payam, with Voyager and ALEPH. Methodology: A checklist designed and included six main traits for evaluation and comparing 73 scales. Data collected by experts' observing of the Software's OPAC. Data analyzed by the descriptive statistics methods. Findings: Findings shows the preferences in search capabilities in species of fields the Aleph with 97% is the most and Payam with 93. 45% is the least, in search formula Aleph and Voyager with 100% has the most and Payam with 58. 33% is the least, in possibility of species of searches Voyager with 83. 9% is the most and Aleph with 78. 73% is the least, in display of results Aleph with 96. 36% is the most and Payam with 78. 18% is the least, in help all of Software with 92. 85% are equal, and in web 2 capabilities Aleph with 80% is the most and Payam with 0% has the least preferences. Results: The results show that Aleph with 91. 30 percent is in first grade, Voyager with 87. 24 percent is in the second grade and Payam with 75. 50 percent is in the third grade. Payam has the least preferences of evaluation than the two other Software.