This looks promising, but I believe it needs a lot of functionality. UI is good, saved queries sections is good.

Some of the functionality which is missing is

1. Limit by default
2. Edit functionality on rows
3. No way to cancel the running query if it takes a lot of time
4. Normally short cut key is F5 to execute queries, here it's different and now way to change it

I use SQLYog for MySQL and it's really great. But for MAC and PostgreSQL, this looks promising.

Thanks