So I have previously stated that I only play wild, and I only play “casually” rather than competitively. I don’t always play on the PC - sometimes I play on my Chromebook and sometimes on my phone (neither of which can use deck tracker).
On my pc I use it simply to track wins and losses on my decks to see what’s working and what doesn’t as I never use c/p net decks.
The tracker indicates “related cards” when oppenents play cards that work with specific combos - I get that… BUT just because the tracker SHOWS the related cards - does that mean that those cards are FOR SURE contained within my opponents decks or is it just showing what combo cards work with the cards that they have played?
If anyone can answer this I truly thank you - it’s not a matter of cheat or no cheat - more of a better understanding of how the tracker is working.
Have a fantastic May Day everyone and thanks for reading 
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Is this the Hearthstone deck tracker, with HSreplays website?
Yes the hsreplay one. thank you for at least acknowledging my question
The related cards are based on popular decks in the meta, it’s not a guarantee that the card will be in your opponent deck
Trackers can’t know what’s in your opponent’s deck without it being shown first (as far as I’m aware) and if they could they would not be allowed to display it to give you an unfair advantage
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that’s what I thought as well just wanted to confirm. Thank you Derkan 
They can and do know things, but they are programmed not to reveal that information until shown.
There are many instances where the trackers were showing information that they should not have shown and required immediate patches to correct the issue.
Yes. It’s a way to track things that are commonly used in conjunction with cards that have been played, but not a guarantee that those cards are in the deck.
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They do, but they don’t have access to the ennemy cards that have not been revealed, otherwise it would be shown in the replays.
For example, ennemy discover options are visible for the trackers and are visible in the replays, but cards your opponent never played or made visible are unknown to the tracker
All tracker information come from a log that is written in real time on your device, that log does not have the information of the ennemy deck, otherwise anyone could simply read the text file to know what cards the opponent have since that log is written in plain text
I must admit I didn’t know the answer to the question as I use Firestone, but at least in Firestone it’s possible to manually insert the decklist you think your opponent is playing and it will correctly (if the decks align) be able to track everything like it’s your own deck they’re piloting.
So it’s possible some people have better info than you because they don’t manually track opponent’s deck based on the cards they know they’ll see played, but you can instead make your tracker do it, which is both easier and more precise. At least in higher ranks, that’s an advantage worth having, and I’m pretty sure if lower-ranked players did it, they wouldn’t stay low rank for long xD
Don’t know if this helps, but if it did, I’m glad
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The data leaks in the past suggest that you are wrong.
The information is there and not reported.
I’m not aware of a single data leak that allowed to see the cards of your opponent’s DECK
The only ones I know about are leaks that allowed to see cards that your opponent generated during the game
Please provide context to your claim
Thank you all for your input and explanations. It seems that the root of my question may be what has lead people to saying trackers “cheat”. I understand that “technically” in coding terms it certainly is POSSIBLE that they have the data, and have leaked the data, but that is not the “norm”.
I also wondered if maybe it would be varied by the fact of are you playing someone else who has a tracker and therefore both of you are getting live game data and that data is shared between both trackers - that would (semi) make sense but on the other hand that would be hard to believe it happens often because I don’t believe many people use the trackers unless they are competitive players who are often high legend tiers and such.
I have made legend, yes, but never HIGH legend so my tracker results aren’t necessarily “counted” by the tracker as a whole deck.
Interesting information presented and you have me over here over analyzing it for someone who plays casually
That shouldn’t matter, your data would just be a part of “top 5k” or “Legend” filters
Makes sense to me…both players’ data need to be sent to the shared database in order to be tracked and analyzed (if for no other reason than to be able to calculate Mulligan statistics and other stuff)
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The tracker doesn’t try to get the data from your opponent’s tracker
When you’re playing a friend you can give the tracker the code of your opponent’s deck if you have it but it can’t get it by itself even if your friend also uses the tracker