We’ve started working on integration between Zapier and Checkvist – and this allows an integration between Google Tasks and Checkvist.
For instance, this allows to “copy” all newly added Google Tasks tasks to Checkvist.
Please read more here: https://plus.google.com/b/114021845786371597651/+Checkvist/posts/SoiDZevJKdZchrisCV commented
I tested Zapier but unfortunately it is NO alternative to a Google Tasks integration.
First of all the free plan is very limited and the basic account very expensive.
But costs aside, there is no way to synchronize the tasks between those two apps! There are too many triggers missing (also on the Google Task side) -> you can only create new tasks/lists on both sides :-(
So please consider a full integration with Google Tasks including synchronisation of status and due dates. This way we could get an integration with the Android devices including widgets to work with the tasks.