Developer diaries

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Hearts of Iron IV
Death or Dishonor icon.png Death or Dishonor
Together for Victory icon.png Together for Victory
HoI4 icon.png Base version

Developer diaries are articles, sometimes accompanied by videos, published by Paradox to describe the game design in detail.

Death or Dishonor[edit]

All developer diaries about Death or Dishonor and patch 1.4 (aka Oak).

No. Title and Link Description Date
1 Reflections and Romania First look at new DLC content 2017-04-12
2 License production and map changes 1.4 Oak and the upcoming expansion will see map improvements and new ways of getting tech 2017-04-19
3 Announcement and AI Update #1 Announcement of new content pack coming with the free 1.4 Oak along with details on AI improvements 2017-04-26
4 Hungary Hungary changes coming up 2017-05-03
5 Equipment Conversion & War Update Repurposing old material and improvements to the war overview 2017-05-10
6 Air Improvements Air combat overhaul in 1.4 Oak 2017-05-17
7 Yugoslavia and Air Zones Yugoslavia unique flavor and more details on aerial combat overhaul in 1.4 Oak 2017-05-24
8 Czechoslovakia and AI Update #2 Let's have a look at Czechoslovakia and another AI update from Steelvolt 2017-05-31
9 Bits & Bobs New subject levels, achievements, music, assorted QoL features and AI Update #3. 2017-06-07
10 1.4 "Oak" Changelog sneak peek Patch 1.4, aka Oak, changelog. 2017-06-12
11 Post-release chat Bugs, new and old, dealt with in the 1.4.1 beta patch. 2017-06-21
12 Meet some new people Beta patch status, preliminary gaming statistics post DoD and introduction of new team members 2017-06-28
13 We're back! New beta patch with additional fixes, more portraits for free and an interim solution to an old AI transport problem 2017-08-16

Together for Victory[edit]

All developer diaries about Together for Victory expansion and patch 1.3 (aka Torch).

No. Title and Link Description Date
1 Future Focus Focus for 1.3 / upcoming expansion along with general plans for the expansions beyond 2016-09-23
2 The Team Presentation of the current HoI4 team lineup 2016-09-28
3 Memory Lane A look at how some concepts have changed over the HoI series, such as: supply, upgrades, reinforcement and more. 2016-10-05
4 Blitz Command and Garrison Orders Blitz Command coming in the next expansion, garrison orders in the free patch 2016-10-12
5 Oh Canada! Canada and the Commonwealth 2016-10-19
6 Ally Down Under Australia updated in Together for Victory 2016-10-26
7 South Africa and Continuous focuses South Africa and Continuous focuses 2016-11-02
8 Autonomy New levels for subject nations coming in Together for Victory 2016-11-09
9 India - Struggle for Independence A closer look at the changes coming for India in Together for Victory 2016-11-16
10 New Zealand & Combat Log New Zealand focus and tech trees as well as a combat log 2016-11-23
11 Together for Audio Music and Audio in Together for Victory 2016-11-30
12 Cosmetic tags, art, gameplay and AI One week to the release of Together for Victory! 2016-12-07
13 TFV AI Update #2 Part 2 of AI bugfixes and updates for TFV 2016-12-09
14 TFV AI Update #3 Part 3 of AI bugfixes and updates for TFV 2016-12-12
15 TFV AI Update #4 Part 4 of AI bugfixes and updates for TFV 2016-12-14
16 Achievements & Patchlog New Achievements and 1.3 changelog 2016-12-14
17 XMAS & Hotfix out! It's time for holidays! Development diaries will be back again in 2017! 2016-12-21
18 Back from Christmas 1.3.2 hotfix patch soon in public beta 2017-01-11
19 Squanching them bugs Planned changes for 1.3.3 and general focus for the 1.4 Oak patch 2017-01-18
20 Getting started with modding Havebeard goes over modding requests and modding tips for beginners 2017-01-25
21 1.3.3 Modding Features More modding features coming 2017-02-01
22 Patch 1.3.3 Update #1 Changes done to industry, world tension and capitulation in the upcoming patch 2017-02-08
23 Patch 1.3.3 Update #2 Details on QoL improvements, AI update, performance and optimizations done in the coming patch 2017-02-15
24 1.3.3 Patch #3 The patch should now be ready for release 2017-02-22

Post-release patches[edit]

All developer diaries about post-release patches, patch 1.1 (aka Red Ball Express) and patch 1.2 (aka Sunflower).

Patch 1.1 (Red Ball Express)
No. Title and Link Description Date
1 Release and Future Podcat shares his thoughts on the release, as well as discussing the near future patches 2016-06-10
2 Red Ball Express Tweaks to access to allied territory, peace conferences, invasions and naval bombers along with new battle plan modes upcoming in 'Red Ball Express' 2016-06-17
3 Summer Vacation The team is going on a well deserved summer vacation 2016-07-01
Patch 1.2 (Sunflower)
No. Title and Link Description Date
4 Back from Vacation AI changes and MP hotjoin in 1.2, aka 'Sunflower' 2016-08-05
5 Custom Difficulty Settings AI improvements and implantation of custom difficulty settings at game setup 2016-08-12
6 Sunflower (patch 1.2) Port Strikes and AI improvements to upgrading templates and naval missions coming in Sunflower 2016-08-19
7 New Releasable Nations A look at new releaseable nations and more of the AI improvements coming in Sunflower (patch 1.2) 2016-08-26
8 Sunflower Improvements Sunflower updates: GUI improvements, naval balance, focus trees 2016-09-02
9 Bugs and Stats Readying Sunflower for release and sharing some gameplay stats 2016-09-09
10 Sunflower is Live Patch 1.2 is out live, next patch is 1.3 aka "Torch" 2016-09-16

Base game[edit]

All developer diaries about Hearts of Iron IV (base game).

No. Title and Link Description Date
1 Our Vision Design goals 2014-02-07
2 The Tools of War Equipment, production and research 2014-03-07
3 Bringing WWII to the mainstream Dogs! 2014-04-01
4 Land Doctrines Doctrine paths 2014-04-11
5 Production Lines How things get built 2014-05-09
6 Division Design Division planner, division template 2014-06-13
7 Air Combat Air war 2014-07-11
8 Experience and Variants Production 2014-08-08
9 Vacation and Air tech Air technology tree 2014-09-12
10 Naval Combat Naval gameplay 2014-10-10
11 Map & Graphics Visual aesthetics of the game 2014-11-07
12 Internal Politics Internal affairs of a country 2015-01-16
13 Conscription & Training Manpower, recruitment, training 2015-02-20
14 National Focuses National focuses 2015-03-20
15 On the high seas Naval battles 2015-04-11
16 World Tension World tension, war justifications 2015-05-08
17 Johan Invades Germany Barely a dev diary 2015-06-12
18 Army Planner Creating and deploying units 2015-06-26
19 Equipment How equipment works 2015-07-03
20 Soviet Union and Communism Soviet Union and Communism 2015-08-14
21 Land Combat Land combat mechanics 2015-08-21
22 Support Companies List of support companies 2015-08-28
23 Industrial Capacity How factories function 2015-09-04
24 Trade and Resources Overview of international trading 2015-09-11
25 Laws and Politics How to manage government 2015-09-18
26 The Navy Naval doctrines and naval technology 2015-09-25
27 Italy Italy's situation in the game 2015-10-02
28 Weather & Terrain How weather and terrain function 2015-10-09
29 Factions & Wargoals How factions and wargoals function 2015-10-16
30 France Overview of France 2015-10-23
31 Peace Conferences Ending wars 2015-10-30
32 The USA Overview of USA 2015-11-06
33 Supply The supply system and supply areas. 2015-11-13
34 Civil Wars Civil Wars and Coups. 2015-11-20
35 Germany Overview of Germany 2015-11-27
36 Helping out in other wars Helping out in other countries wars without directly getting involved 2015-12-04
37 Carrier Warfare How aircraft carriers work. 2015-12-11
38 Submarines How submarines work 2015-12-18
39 The Radio Radios, reinforce chance and radar stations. 2016-01-08
40 Changes to the game Completely revised factory slots mechanic, World Tension.. 2016-01-15
41 Order of Command OOC and Commander traits 2016-01-22
42 Japan Overview of Japan 2016-01-29
43 Diplomacy and other options Diplomacy, Factions, War Goals, ... also: HOI4 is now in BETA 2016-02-05
44 Occupation and Resistance Managing occupied territory 2016-02-12
45 Battle Plans How battle plans work 2016-02-19
46 United Kingdom Overview of UK 2016-02-26
47 China Overview of China 2016-03-04
48 Naval Invasions How naval invasions work 2016-03-11
49 Nukes! Atomic bomb - Research and requirements for production and use 2016-03-18
50 Generic Focus Trees Generic Focus trees and DDR mat support 2016-04-01
51 Sound & Music Music & Sound Design in Hearts of Iron IV 2016-04-08
52 Modding A look at the improved modding support in Hearts of Iron IV 2016-04-15
53 2D art Sideburnout talks about the 2D graphics of Hearts of Iron IV 2016-04-22
54 AI SteelVolt speaks of the topic no one wants to touch, but everyone wants to know about 2016-04-29
55 QA A closer look into the QA process when developing Hearts of Iron IV 2016-05-06
56 Bits & Pieces Mopping up a bunch of smaller topics not covered in other Development Diaries 2016-05-13
57 Poland: United and Ready About the free DLC shipped with all copies of Hearts of Iron IV 2016-05-20
58 Tutorial, Wiki & Browser A look at the tools we provide to help you learn how to play Hearts of Iron IV 2016-05-27
59 D-day A short, final message from Podcat before we release 2016-06-03

Archives & Videos[edit]

Archive threads (on the forum) and video developer diaries on the various expansions.

No. Diary archive Start date End date
1 HoI4 (base game) 2014-02-07 2016-06-03
2 Post-release patches 2016-06-10 2016-09-16
2 Together for Victory 2016-09-23
No. Video archive Description Start date End date
1 Hearts of Iron 4 Live streams Earlier previews of Hearts of Iron IV by the devs mixed with Q&A 2014-08-18 2015-01-21
2 World War Wednesday Daniel Sjöberg (replacing Jakob Munthe as Nazi Germany) faces off against Johan Andersson (as Jolly England) in the war of the century, testing out the ins and outs of Hearts of Iron IV 2015-12-02 2016-03-10
3 World War Wednesday - Pre-release Jake and Daniel showcasing single player campaigns and co-op nations 2016-03-17 2016-06-23
4 Hearts of Iron IV - Beginner Tutorial Jake (aka DDRJake) hammers HoI4 beginner tutorials in a soothing, calming voice 2016-05-30 2016-06-03
5 The Three Day War Multiplayer event of HoI4 where devs and youtubers vying for dominance 2016-06-14 2016-06-16
6 PDX FanGathering 2016 A sneak MP peak at the new HoI4 Together for Victory expansion at the 2016 PDX FanGathering 2016-12-02
7 Together for Victory feature stream Together for Victory feature stream by Dan and Daniel 2016-12-07