When comparing Emacs Org-mode vs xpert timer, the Slant community recommends Emacs Org-mode for most people. In the question“What are the best time tracking apps for freelancers?” Emacs Org-mode is ranked 7th while xpert timer is ranked 27th. The most important reason people chose Emacs Org-mode is:
This app's flexibility is based on its minimalist approach, giving the user near-infinite freedom.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Ultimate flexibility
This app's flexibility is based on its minimalist approach, giving the user near-infinite freedom.
Pro Absolutely free
Emacs with Org-mode is free as in beer and free as in speech – that is, it costs nothing and it’s totally open source.

Pro Files are usable anywhere at anytime
Users are not tied to one service provider, program, platform, or database engine.

Pro Incredibly extensible
There are many plug-ins for Org-mode, including Org-habits and Org-notify. If Org-mode lacks some piece of functionality, it is very easy to add it.
Pro Agenda views
Pro Excellent unofficial Android app (orgzly)

Pro Offline support
Pro Efficient features for deadline organization
Pro Supports plaintext spreadsheets
Pro There are a lot of extensions, for exporting to html, bootstrap, js-reveal and much more
Pro Quickly add rich text
Pro No subscription needed
Pay once and use as long as you want, no monthly fees or payment plans.
Pro Team tracking
Multiple users can track time at the same time.
Pro Built in user reporting
Allows one to easily see what things are wasting time in ones workflow.
Pro Works on and offline
All one needs to do is sync up to an internet connection at some point for all data to syn between devices. The app can be used offline to only connect to the internet at a later time to sync.
Pro Android version available
There is an Android version of the app available for use, though it does cost separate from the PC app.
Cons
Con Unintuitive user interface
The key combinations are unintuitive and difficult to remember. This is probably because there are a lot of hidden "modes" depending on where the cursor is. Actions aren't paired with reversing actions like in other todo apps. For example, hitting shift-tab does NOT reverse the effect of hitting tab.


Con Android app isn't very good
There are several user-created apps for Android, but none seem to offer the same level of functionality as other to-do apps.
Con Not really cross platform
Although it is possible to get a lot of it working, no all in one, sync included, out of the box solution is available for mobile devices.
Con By default, a hard-to-read display
The default way of writing an outline or checklist creates a very messy wall of text that's difficult to read with no vertical spacing. You can manually add vertical spacing, but the Org operations don't preserve it. There are pretty-display modes, but you need to remember how to enable them, etc. etc.
Con Free versions have limited uses
The free Android version has only 50 uses allowed and the free PC version has a limited 30 day trial. While nice to be able to try the app for free many other timers allow single user unlimited use of their apps.
Con No iOS version available
The software is only available for Windows and Android operating systems.
