In mechabellum, many units have one or more counter units. Some other Guides and Tier-Lists exist that list the specific counters for each unit.

I build a tool on that knowledge, which rates all units into a tier list of most probable counter units for any given combination of enemy units.
https://mechabellumcounters-f4rc7xarezbsroxpfc2w7n.streamlit.app/

The tool uses a counter matrix, which partly depends on other publicly available sources and partly on my own measurements within the games simulator.

Mostly, I used the following website
https://mechamonarch.com/guide/mechabellum-counters/

As well as another guide. I found the idea of pairing units of equal cost within the games simulator very straight forward. Details can be found here:
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=2981751067
In general I followed the notation of the above mentioned guide. All counters of a given unit are rated within different tier system:

• S: Unit is a hard counter
  
• A: Unit is almost a counter
  
• B: Unit wins, but is about half damaged
  
• C: Unit wins, but is nearly dead
  
• D: Unit looses, but does some damage to the opponent
  
• E: Unit is countered

For the internal matrix, I compiled the available information and measured the Tarantula as well as Farseer on my own. Here is the resulting unit matrix, which is used internally:

For the necessary calculations the tiers are translated into numbers as follows:
S = 5
A = 4
B = 3
C = 2
D = 1
E = 0

Using the web-tool, you can estimate the best counter units, given on or more units on the enemy board.

Just choose the units on the enemy board:

And get an estimation of the best counter units:





Disclaimer:
All the units are measured without any tech and without positioning. So, the counter units given, may not be the best choice within a real game with all the different types of tech and positioning.

https://mechabellumcounters-f4rc7xarezbsroxpfc2w7n.streamlit.app/

Anyhow, I hope this is helpful to start with the game and to give fast ideas of potential counter units for a given opponent army.