Nice list.
I was usually using this website
https://jochen-hoenicke.de/queue/#0,24h

EDIT:

But I am switching to this one now:
https://mempool.space/tv

Thanks

Another +1 for Jochen's site. It tells you everything you need to know in a single glance to work out the best fee for your own needs. The best option.

A couple of the sites you have listed are poor recommendations. btc.com and bitcoinfees.earn both constantly and significantly overestimate fees. For example, right now the mempool is pretty much empty, and if I was making a transaction I would pay 1 sat/byte and be pretty confident it would be confirmed in the next block. Bitcoinfees.earn is recommending a fee of 16 sats/byte and btc.com is recommending a whopping 62 sats/byte. 62 sats/byte would put you 0.02 MB from the tip. Completely unnecessary and a massive overpayment.

If you can't figure out Jochen's site, then the next best site is usually https://coinb.in/#fees. You can ignore all the complicated sliders if you like and just look at the number at the bottom of the blue box. It will give you a much closer representation to what fee is actually required to be fairly sure of getting in to the next block, with massively overestimating like the two sites above.

Hey OP, just wanted to add here more mempool viewers and fee estimators

1. https://btc.bitaps.com/ (under the mempool analytics section)
2. https://www.buybitcoinworldwide.com/fee-calculator
3. https://www.blockin.com/stats/unconfirmed-txs
4. https://bitcoiner.live/
5. https://btc-fee.net/
6. https://spookiestevie.com/bitcoin/
7. https://bitcoinfees.net/

About the output setup, most of time it is set at 2. It is rarely to have transaction with only 1 input and 1 output. In contrast, we ususally have 2 outputs, one for receiving address, and one for a change address. You will have 1 output if you send all of your money from the input to the receiving address. If not, you have to set it with 2.

Something is wrong with https://coinb.in/#fees too. The suggested fee is 191 satoshis/ byte that is unacceptable too. I remembered recent days the fee has always been at 191 sats/ byte. It is probably the site has issues to update stats.

Or you can do custom (V1 or V2), base on your use case. There's always an option. mempool space/tv is version 2.
Here's the link : https://github.com/mempool/mempool

This bug has been long fixed. Their suggested fees are up-to-date again.

Removing this as it no longer works.