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Research is one of the Hearts of Iron 4 vanilla mechanics, for which the Old World Blues mod contains custom content.

Research is the priamry way of unlocking technologies, but some technologies can be obtained by completing a focus, or by a special event.

Research Slots

Technology is unlocked by assigning a research slot to it for the required number of days.

The base number of research slots depends on the country: Most generic nations and minor nations have 3 research slots with 2 more additional possible via national focus.

Research slots of Major Nations on Game Start

This table tracks the ammount of Research slots of various nations either at the start of the game, or the point of the Nation's creation.

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This page is still under construction. Information here may be inaccurate, incomplete, or incorrigible!

Slots Nations
6 Alamo Chapter
4 Caesar's Legion

Research time

Each technology has a base time cost. They are multiples of the standard base cost of 85 days.

Cost(Days) Technology
70 Riot Control (1,2,3,4),Power Armour Equipment(1),Glider,Electronics(1)
91 Aerodynamics tech (1,2,3,4,5,6,7),
105 Electronics(2)
140 Infantry Training(1,2,3,4,5,6,7,8), Energy Equipment(1,2,3,4,5,6,7), Balistic Equipment(1,2,3,4,5,6,7,8), Mele Weapons(1,2,3,4,5)
240 Equine Technologies(all of them)

Research Speed Modifiers

Impact of game difficulty on research speed

Ahead of time Penalty

Ahead of time penalty works the same way, as in the vanilla HOI4. Hoi4 Wiki link.


Technologies are split into 15 technology folders.





Technology management

Nation specific