I wrote article about Simple app. earlier - read here
This Website is operated by Simple Europe UAB, a legal entity, duly registered under company number 305959834 by the State Enterprise Center of Registers of the Republic of Lithuania as a virtual currency exchange operator and a virtual currency custodian wallet operator. Registered office at Gyneju str. 14-65, Vilnius, Republic of Lithuania, 01109

-> Join the Simple Tap Telegram bot
Yesterday, they added different boosts (under the "Boost" tab) to increase your passive mining speed (2nd & 3rd sections) and the coins limit to tap (1st & 4th sections).

If the bot doesn't load, click on the three vertical dots in the top right corner of the screen and reload the page.

Spend the accumulated coins to boost your passive/active mining speed (dividing the cost of the boost by the bonus it gives and calculating how long it will take for that boost to pay off) – well, that's just the beginning!