If you are looking for a platform to quickly find out all-time high prices for different cryptocurrencies then ATH Coin Index will help you with it. It has this information calculated and ready for your consideration.
Bitcoin seems to have retraced 50% from its ATH even though it's had a ~40% or so correction from recent highs. Nevertheless, it's a good retracement so far.
STEEM, on the other hand, is doing quite poorly as one would expect in terms of sheer numbers. Take a look at the following picture.
Well, I guess 97% is better than over 98% from earlier!
In any case, if you are trying to catch bottoms of altcoins then this site could potentially help you with your research. But I'm not so sure if catching falling knives is a good move generally speaking. Same applies for altcoin market which is mostly in the dumpster right now.
Goodluck.
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