what's the difference between crypti and lisk, why if crypti dapps platform failed this one should success?
Crypti dapps platform did not fail. All available Crypti development funds (750 BTC collected in mid-2014) were used to complete development of Version 0.5.5 of Crypti software supporting sidechains dapps. This Version 0.5.5 software was made open source (a first for the current Crypti version, I think), placed in Github, and preparations were being made to replace the Version 0.5.4 Crypti software currently in use with this new Version 0.5.5.
At that time (Jan 2016), Crypti faced significant challenges. Development funds were at zero and several original core developers were moving on to other projects. Also, there was disorder among the 101 Crypti servers used to secure the blockchain. These servers were run by volunteers receiving minimal rewards to cover their server costs. Many original Crypti participants dropped out of the project and took their node servers offline. More recent recruits did not stand up operational node servers as replacements as they should have. Votes by all Crypti coin holders were not effectively utilized to keep operational servers in the top circle of 101 delegates.
There were discussions and eventually disagreements among members of the Crypti Foundation members on what to do next. To make a long story short, on Feb 1 Max and Olivier made a surprise move to create a fork of open-source Crypti called Lisk, start significant forging rewards of 150K in Year One for Lisk forgers to motivate their ongoing node participation, and start a fund-raising ICO to support a fresh technical development staff to develop Lisk 0.5.6 and beyond.
And here we are, five weeks later.