But poloniex

Yeah me too - I have had three 'wisdom pages open in tabs for years: Stamp BTC/ Finex BTC / Polo (for XMR/BTC)
It started getting glitchy a couple of days back - now all three are just frozen.
Will check .io out - I am just used to the candles and indicators.
Yeah... I believe that I had been using bitcoinwisdom.com for nearly the whole time that I have been in bitcoin, perhaps I found out about it 6 months or so afterwards (so since about mid-2014), and continuously have a Stamp tab open.. and sometimes some other tabs with other exchanges too, just for a quick reference. I did not have too many bugs with bitcoinwisdom.com, but yeah a little weird to continue to see btc-e as one of their exchange monitoring options and it is stuck at a July 2017 price.... I don't blame btc-e for all their getting shut down and all that, even though I ended up losing money through the deal... (seems like a less than 1% chance for any recovery of funds, now). They were surely treated unfairly by government authorities.. and customers got screwed.
I just switched over to bitcoinwisdom.io. I am a little disappointed that Gemini is not listed on there... but hey it does seem to have a very similar look and feel as compared with bitcoinwisdom.com. I am going to keep one of my bitcoinwisdom.com tabs open for a while, just to have a quick cross reference if I might need it some day, perhaps?