1. Different properties

1. Ei

Compendex: It is the American engineering index Ei database and the world's earliest source of engineering abstracts.

2. EI: It is the oldest large-scale comprehensive search tool in history founded by the American Federation of Engineers.

2. Different functions

1. Ei

Compendex: Ei-Village derives a number of sub-systems from the core database Ei

CompendexWeb Database, and provides smooth connections to a large number of databases around the world to collect, filter, and organize engineering network information resources around the world.

2. EI: for collecting and reviewing literature in the field of engineering technology around the world.

3. Different engineering fields

1. Ei

Compendex: involving nuclear technology, bioengineering, transportation, chemical and process engineering, lighting and optical technology , Agricultural Engineering and Food Technology, Computers and Data Processing, Applied Physics, Electronics and Communications, Control Engineering, Civil Engineering, Mechanical Engineering, Materials Engineering, Petroleum, Aerospace, Automotive Engineering and sub-disciplines of these fields along with other major engineering fields.

2. EI: includes research results in all engineering disciplines and engineering activity fields.