The best replacement for sencha touch is jquery mobile.

The best alternatives to sencha touch are rated as following:
★★★★★  jquery mobile
★★★★★  phonegap
★★★  extjs
★★  dojo mobile
★  appcelerator
★  appcelerator titanium
★  phonejs
  cordova
  sencha architect
  jqtouch

Your alternative for sencha touch is not listed? Suggest!
Speaking about sencha touch, one probably shouldn't forget about phonegap.

Other search terms related to sencha touch and their ratings are:
★★★★★ phonegap
★★★ phonegap android
You have in mind a companion for sencha touch and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sencha touch in all years. Click on graph for more.
sencha touch
jquery mobile
phonegap