Mod «Ultra Historical Mod - Realism Overhaul» for Hearts of Iron 4 (v1.12.1 - 1.12.11)

Ultra Historical Mod - Realism Overhaul

What is ULTRA?

HOI4 ULTRA's goal is to give a historical feeling to Heart of Iron. Our ambition is to make the less changes as possible from the vanilla, but rather adapt it to a real historical balance and is meant to be played in Multiplayer.

The original goal was to give an historical repartition of the industry, but we decided to add/fix/tweak other contents we feel important.

Reasons to play or not to play ULTRA

  • You should not play ULTRA if you want memes games
  • You should not play ULTRA if you want to world conquest with [insert irrelevant minor nation]
  • You should play ULTRA if you want more historical immersion without changing the whole game
  • You should play ULTRA if you want a multiplayer game balanced toward History and realism
  • You should play ULTRA if you want to feel the power of a major country during WWII


NOT Ironman/achievement compatible

NOT compatible with any mod changing the checksum. If you want your favourite mod integrated, just ask it (and the mod creator too) and we'll see what we can do.

All current DLC (TFV, DOD, WTT, MTG, LaR, NSB) required for a complete experience. We cannot promise potential issues if you play without the required DLCs.

The alternative histories focus trees are supported but less develloped and tested than historical path

For the moment, only the english version is supported

Main feature - Industrial rebalance

The primary objective of our work was to "correct" the industrial balance in the game :
In vanilla, industry is balanced around "playability" and not around History. For the HOI4 devs team, each minor country should be "playable", the Axis should have a chance to "win", global conquest should be a possible achievment...

We don't agree with this view and want rather to play in a situation with historical settings concerning the relative power of each countries.

That's why we did a research work about the industry in the WWII timelapse in order to translate it into a mod. Our main sources are The Wages of Destruction from Adam Tooze and The Rise and Fall of the Great Powers by Paul Kennedy.

From the later, we took the concept of "war potential" for each 1936 country and translate it into ingame industry (civilian, military and dockyard). To gives some figures, the 7 Great powers have more than 90% of the world IC and the gap between the last major power (Italy) and the first (the USA) is more than 1 to 10.
To have a better repartition, we made each vanilla IC equivalent to 2 IC in the mod.

To stay in the border of plausible, we also had to change 2 keys elements : the industrial growth rate (nerfing heavily industrial snowballing, we now get a growth rate under 10% per year in 1936) and the ressources system. Coal, Iron and Bauxite were added and globaly ressources are less expensive to get (depending of the ressource) to avoid overpowered minors from lots of ressources and majors having to trade away half of their industry.

Other features

We tryed to keep things as close to vanilla as possible, so most of our work here are balance tweak for a more realist gameplay. Here is a list of some features we added or changed :

  • Division designer (10 max support + 20 max line, combat width changed from 80 to 192 base width)
  • Naval overhaul "Naval Rework" mod integrated
  • Nation-uniques tanks and aircrafts for majors
  • Integration of some QoL mods


  • Disabled port strike mission.
    Due to vanilla issues, we can't balance it right. The issues are in known by pdx. We'll re-enable the mission once paradox have fixed it.
  • Battle of Taranto + Pearl Harbor Attack Decisions added to compensate the previous change


  • Germany gets first jet fighter a few month earlier to be able to match historical production
  • Theorist cost lowered to 100/75
  • Halve the time required for STRAT bombers to reach full mission efficiency
  • nerf logistics company
  • Remove resources to market bonus from autarky economy
  • reduced base IC output to 1.0
  • increased costs on most infantry equipment
  • Reduced USA conscription focus PP gain
  • Reduced night penalty bonus accross the board
  • Ground Mission XP Gain reduced
  • adjustments to org and recovery rate
  • Additional Doctrine Cost Reductions for USA + Canada


  • Some tweaks for US generals
  • USA naval designers added
  • Soviets no longer start with PPD-40
  • Soviet inf starting techs fixed
  • Soviet inf tech focus boosts changed
  • arty brigades now needs 450 manpower
  • light/medium tanks brigade have same brigade as heavy one
  • Added uniforms tech for Finland
  • Carrier Sub Detection added to Base Strike
  • Added night penalty reduction stats on a bunch of aircrafts having historicaly night radars
  • Reduced synth rubber values from techs/focuses
  • Removed the new tech slot added last patch
  • removed menjikinag cores in China to avoid supply issues
  • integrated puppets gets back overlord bonus modifiers
  • UK/Netherland oil-pupetts are now integrated puppets
  • Added minors Localisation
  • Re-introduced a couple of night-fighter aircrafts
  • Air wings reduced to 72/36/6
  • Reduced number of starting aircraft for Germany
  • Swapped places of Fire Brigades and Armoured Infantry doctrines
  • fixed US starting inf tech
  • Added USA infantry tech bonuses in focuses
  • licensing penalties are back
  • USA Coal Decisions Update


  • Added 2 new terrain types Atoll and Rocky Islands with reduced base combat width
  • Add new naval regions to Central and West Atlantic
  • Chukchi Peninsula is now impassable


  • Condense ship classes and aircraft types in the intel ledger
  • Fix overlapping text in officer corps
  • Added Tooltip for Dockyard Limits in Production window
  • Updated doctrine names & description
  • Added more fighter group names for Germany
  • MPU icon port finalized


  • Fixed political advisors traits for the US
  • Corrected description of GER rocketry focus
  • Fix pre-dreadnought ship designer GUI
  • fixed conversions
  • SOV/US volunteer cap decision fix
  • Fixed Soviets from getting positive encirclement penalty
  • Vichy France Establishment Fixed
  • Beaufort/Beaufighter fix


  • Updated AI preferences naval designers

Version 15.03.23 for Hearts of Iron 4 (v1.12.1 - 1.12.11)


  • Old Mulberry decisions reimplemented and improved
  • Improved content for Weserübung/Narvik/Sweden mini-game with german access to swedish resources
  • UK officers reworked and new added


  • Port Strike effects are now sane
  • Ship range module rebalanced
  • Various balance changes for infantry designer
  • UK can't invade Ireland nor ally Portugal in historical setting
  • German Autarky-led economic crash is less absurd
  • Lowered penalties on german autarky
  • Reduced Nazi penalties to Consumer Goods
  • economic mobilisation laws have more effect on factory efficiency growth
  • switching to an equipment variant is less penalizing
  • Nerfed manpower from collectivist propaganda
  • Slowed Mob speed bonus from military service
  • increased convoy requirement for unit transport/naval invasion by a factor of 10
  • Screening ratio for convoys rebalanced
  • buffs to early british tanks
  • nerf to subs visibility
  • chances to spot ships lowered
  • Ship engine refit increased
  • UK gets more political power with characters/focuses
  • Nat. Spain should correctly have upper hand in the SCW
  • Shallow Seas are less penalizing for ships in terms of visibility
  • Nuclear Reactor cost halved so USA can get the atomic bomb on time


  • long range modules on ships affects naval damages (represent bigger amount of ammo stored )
  • Recalculated treaty ship limits
  • Lower German ship limit to 16k IC
  • Added back a few more option for ship main batteries
  • Capitals no longer gives free supply
  • Added a few resource puppet states of UK/Netherlands as workaround against teleporting oil bug
  • Added a bunch of new naval designers
  • Manpower from conscription laws is lowered accross the board
  • Extra limitations on conscription laws for democratic countries
  • Tanks steel cost uniformized
  • Everything needs more coal to work
  • Airbase and Naval base max lvl increased to 40
  • Ports lvl on map changed to fit with new max lvl
  • Strategic redeployment is slower, especialy with low infra/railroads
  • Snorkels techs are available later
  • Max dockyard for screen ships set to 5
  • UK correctly starts with volunteers only law
  • More coal available in Soviet Union


  • reworked railways/supply hubs in Northern Russia
  • new batch of VP added in Russia
  • Western Siberian coast west of Arkhangelsk is impassable


  • Added more displayed decimals for designers
  • Better subtech icons for infantry techs
  • Added new subtechs icons
  • Added more country unique localizations for infantry techs


  • AI should no longer suicide fleets in German Bight
  • UK AI should garrison better Malta and Cyprus
  • AI Italy correctly sends more divisions to help Nat. Spain
  • AI Soviet Union should build and use some heavy tanks
  • AI vs AI Eastern Front should be a bit less in Axis favor


  • fixed various issues with infantry designer
  • carrier wing bug fixed
  • fixed rockets missiles not working
  • relevant planes can do naval patrol missions
  • removed ghost AFV poluting AI
  • fixed UK starting with manpower shortage


Version 03.02.23 for Hearts of Iron 4 (v1.12.1 - 1.12.10)


  • Compatibility with 1.12 and BBA DLC


  • Speed is back as a relevant aircraft stat in game and is no longer a simple indication
  • Rebalance of naval warfare and ship stats to consider new systems introduced in 1.12
  • 80 compliance threshold now reduces resistance target by 10


  • Standardized wing sizes
  • Adapted naval OOBs to BBA and improve them
  • Standardized plane missions and types
  • Reduced german starting fuel silos


  • Revisited the BBA Italian focus tree to be more historical
  • Various new focuses added, especialy for Germany
  • UK can host a czech in-exile government once ww2 starts
  • Heydrich is now available as Prince of Terror, Himmler repurposed with unique role
  • MR pact gives now trade incentives for Germany to buy Soviet materials
  • Trade decision between USA and Canada so Canada can fuel allies economy with raw materials


  • fixed minor border innacuracies


  • Minor AI balance fixes
  • German AI should not send too much tanks into Norway/Greece
  • German AI is more efficient when invading Norway


  • Various focus trees layout improved
  • Improved tooltips
  • Discord link added to the main menue


  • various minor bugs fixed


  • We no longer use tank pictures from the World Ablaze mod
  • Added MPU NATO counters


Version 13.08.22 for Hearts of Iron 4 (v1.11.1 - 1.11.12)


File info

  • Added by: TOP-Mods
  • Author: Vorondil
  • Mod version: 24.03.23
  • File format: ZIP
  • File size: 140.4 mb
  • Source: Go to
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Thanks for uploading topmods! love this mod


thanks alot topmod.


I could also bring the mods

Non-Aligned Reichkommisariats 

More Reichskommissariats! + Fix RK Ostland




Need update, please.