When comparing Locale vs Tasker, the Slant community recommends Tasker for most people. In the question“What are the best Android apps for making your phone automatically perform certain actions based on set criteria?” Tasker is ranked 1st while Locale is ranked 9th. The most important reason people chose Tasker is:
Tasker has an impressive amount of triggers, actions, and parameters that can be used together in an incredible variety of ways. It can even accept scripts to follow instructions.
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Pros
Pro No noticeable effect on battery life
Even with Locale's advanced functionality, users have reported no noticeable effect on battery life.
Pro Uses Google data backup API
All the "situations" used on Locale are saved using Google data backup API, so once the variables are right, they will never be lost.
Pro Balances ease of use and complexity
This app is complex, but the UI makes it easy for anyone to use without much of a learning curve.
Pro Optimized for low battery drain
Pro Uses WiFi to determine location
Instead of using GPS like other apps, Locale uses WiFi to determine a user's location when possible. This is one of the reasons that Locale is so efficient when it comes to battery life.
Pro Infinitely tweakable
Tasker has an impressive amount of triggers, actions, and parameters that can be used together in an incredible variety of ways. It can even accept scripts to follow instructions.
Pro Create powerful custom applications
Tasker has the ability to create custom applications, effectively replacing multiple installed apps in your phone with tasks that are triggered automatically. What's even better is that they will be custom tailored to fit your specific needs.
Pro Can adjust system software
With Root access it can also dabble with system software which other apps are not likely to achieve at the moment.
Pro Export tasks as standalone apps
Tasker allows exporting workflows you've created as standalone applications that can then be shared or even put on the Google Play store.
Pro Awesome plugin support
Tasker has awesome plugin support to connect with hardware that usually requires installing specific apps. For example, it has a plugin for Pebble smartwatch so that you can automate tasks that require using Pebble.
Pro Purchase only once
The dev does not keep bringing out revised apps expecting you to pay each and every time; the same app has been developed consistently for nearly a decade.
Cons
Con Awful user interface
While it's incredibly powerful, Tasker's user interface is counter-intuitive, confusing, and just plain clunky at every turn.
Con Steep learning curve
Tasker lacks good documentation or tutorials, which is important as the learning curve is very high if you want to use its advance features where this app actually shines.