To show off just a bit of what this feature can do, let's take a look at what it can reveal about some of Melee's top players. For this data, I'll be looking at offline events only. The character matchup tool interacts with the filter bar on the far left of every page on desktop or at the bottom of each page on mobile, like so:
What with the whole #1-in-the-world-three-times-running thing, Hungrybox has tremendous win rates pretty much any way you cut it. But his win rates against his fellow floaties are almost incomprehensibly good. Against tournament-relevant floaties (Jigglypuff, Peach, Samus and Luigi), Hungrybox is as close to unbeatable as it gets:
At this point, if you're a floatie who has taken a game off of Hungrybox, you can wear it as a badge of honor. The full list of players with recorded game wins with a floatie over Hungrybox in our database is as follows:
All with one each. To put Hungrybox's 90.57% win rate in context, if he were down 0-2 to a floatie player, we would still assume he had a 74.2% chance to pull off the reverse 3-0. Honestly, just switch to Fox already.
Mew2King dual wields his Marth and Sheik in bracket, and the group matchup tool shows just why this is such an effective pair. Essentially, for M2K, it comes down to a simple question: Spacie or No Spacie?
Against spacies, while his Sheik is strong in a small sample (19-10, 65% win rate), his Marth is the go-to:
Using the "Invert" check box on the far right, you can easily turn your query from "How does M2K do against spacies?" into "How does M2K do against everybody else?" The difference is stark:
Against 19 opponents using non-spacies, M2K has a losing record as Marth against 11 of them. Enter the Sheik:
Not only does the Sheik have a substantially better win rate, approaching M2K's Marth's win rate against spacies, but it also has a positive record against 24 of 28 opponents. That's the power of a well-practiced dual main.
No active player (an important distinction considering Armada's dominance) destroys fast fallers like Mang0, whether he's using Falco or Fox:
Of the 30 fast faller players Mang0 has squared up against according to our records, only one, Leffen, has a positive record on him. Both Mang0's Fox (42-16, 72.4%) and Falco (182-72, 71.6%) have maintained a 70 percent or higher win rate on fast fallers.
Against other fall speed classes, we see a bit of a split between his Fox and Falco. The Falco is the best answer to his struggles against floaties:
Whereas his Fox slays the midweights:
Yet again, we see the power of having two strong characters available. Mang0's Falco may be his flashiest character, but the Fox serves an important purpose against those pesky medium fallers like Marth and Sheik.
Leffen's return to the Top 3 and rise to the Top 2 over the 2018 and 2019 seasons came in large part from a newfound dominance against his fellow spacies. From 2015-2017, Leffen was 92-57 in recorded games against spacies, a 61.7% win rate -- solid, to be sure, especially considering recorded games are almost always against top talent, but far from the dominance we see from Mang0 above. Armada in particular had Leffen's number, with the retired former #1 holding a 31-17 advantage across those three seasons.
Over the 2018 and 2019 seasons, Leffen kicked it into a new gear against Armada and the rest of the spacies, posting a 90-35 record (72.0% win rate) against spacies, including winning records over Mang0 (20-17, 54%) and Armada (17-10, 63%).