Not sure if it's just a visual bug or something else but I spotted some anomalies when using fees that are less than 100 Sats:
SS of the bugtxfee.org/recalculate is only for blockchain.info wallet, not for all wallet since blockchain.info wallet has a bug.
the fee that you are seeing at the bottom is applicable for rest all wallets -> segwit transactions.
yes, i made it real-time by automatically refreshing but removed it later.
The interface is nice but you need to work with it, add some charts and update the data automatically every few seconds and not when we click reload.
FASTEST FEE looks inaccurate, it is better to replace it with 15 Min so maybe Next Block (3~12 Min)
You can add some details such as the best time to send, advice about not sending at the current time, and others.
Each block is mined on average every 10 minute.