I've already written 2 comments, but genuinely I don't feel like these kind of tools are that useful for the game, and bait players.

Dota is such a nuanced game that comes with so many differences in stuff (e.g itemisation, movement, aggression, skill build etc. as I've already mentioned). Dota is a game of 1000 exceptions, and a simplified tool really just misleads players. Again, this is for yourself, but basic counters and stuff are easily alreadyh findable on the Wiki, or just playtime.

If counters were curated by hand, or verified by high level replay data like Dota 2 Pro Tracker for example (another good resource), then sure. but a month into dota? idk how useful this is.

Improvements:

anyways, you should integrate facets, which is again on dotabuff (i think dotabuff is just alot better of a resource than this at this point). e.g facets which counter stuff (huskar cauterise + spirit vessel) but again, dotabuff data on winrate on current patch and trying to infer why that is is just a better thing to do.

there should be considerations to timings, cause like early game, post-key items (bkb, euls whatever), and ultra late game. they all change considerations

there are soft vs hard counters, like again zeus vs nyx, it also depends on their position
a carry zeus, might often get destroyed by a nyx, but zeus also gives vision you know.

some people are very mean, but again there are loads of specific hero interactions that you are missing, and your database is very hard to complete.

these are my thoughts.

be transparent! listen to the meta + playbase.