Alpha Version 
Released 
Days 1 
Days 2 
Kickstarter 
July 2013? 
 
 
Alpha 1 
8/16/2013 
 
 
Alpha 1 Stable 
9/18/2013 

33 
Alpha 2 
11/9/2013 
85 
52 
Alpha 3 
11/19/2013 
10 
10 
Alpha 4 
11/24/2013 
5 
5 
Alpha 4 Stable 
11/27/2013 

3 
Alpha 5 
12/13/2013 
16 
16 
Alpha 5 Stable 
12/21/2013 

8 
Alpha 6 
1/15/2014 
33 
25 
Alpha 6.4 Stable 
2/6/2014 

22 
Alpha 7 
2/28/2014 
44 
22 
Alpha 7.11 Stable 
4/22/2014 

53 
Alpha 8 
4/27/2014 
58 
5 
Alpha 8.8 Stable 
7/23/2014 

87 
Alpha 9 
8/15/2014 
110 
23 
Alpha 9.3X Stable 
9/18/2014 

34 
Alpha 10 
11/22/2014 
99 
65 
Alpha 10.4 Stable 
12/19/2014 

27 
Alpha 11 
4/2/2015 
131 
104 
Alpha 11.6 Stable 
6/12/2015 

71 
Alpha 12 
7/3/2015 
92 
21 
Alpha 12.5 Stable 
8/23/2015 

51 
Alpha 13 
12/12/2015 
162 
111 
Alpha 13.8 Stable 
2/5/2016 

55 
Alpha 14 
3/26/2016 
105 
50 
Alpha 14.7 Stable 
6/20/2016 

86 
Alpha 15 
10/5/2016 
193 
107 
Alpha 15.2 Stable 
2/4/2017 

122 
Alpha 16 
7/12/2017 
280 
158 
Alpha 16.4 Stable 
10/26/2017 

106 
Avg. days between release 

95 
53 
Days since last release 

311 
205 
A1A4 where not on Steam. A5 was the first Steam release, and is considered the official release date by many sites.
All console dates highlighted in green received Alpha 15 release content.
Now look at the time on some of the larger builds.
 A9 was a complete interface overhaul and the introduction of Randomly Generated Worlds. Buff system was introduced along with many effects.
 A11 was recoded for Unity 5, added the gore block system, and many other features in RWG. It was the largest update yet when it released.
 A13 had huge framework changes, added HD Zeds, motion capture movement, dismemberment, the knockdown system, and weather.
 A15 was again the largest yet. New Distant Terrain feature introduced. A large number of new POI's. Larger Navezgane map. New height map for large mountains. A redesign of the RWG system. Traders and economy were introduced. New Blood moon horde system with dynamic difficulty. And loads more.
 A16 again was larger than any previous with more modifications to disatant POI, and the game stages. Electricity was added, a ton of new POI's, and screamer horde changes,. Plus more work on the RWG mixer system, world previewer, and the addition of a crapload of more zombies and animals.
 A17 basically looked at all the others and said, "Here, hold my beer".
A complete rework on the code upgrading to Unity 2017. Huge amounts of optimization are part of this rework. New vehicles, new physics for vehicles. New buff system. Completely new weapon system. Another complete rework on the RWG system and distant POI. And those are just a few of the key features.