When my app crashes in live it would be nice to get emailed the stack trace/error info.
Does anything exist to do this?
I found honeybadger.io which looks about right but is this the best way and best option?
There are many of them. Recently got tipped on https://www.bugsnag.com Really fair free plan!
if you want a 100% free, but simple solution, you can use https://rubygems.org/gems/exception_notification together with https://rubygems.org/gems/slack-notifier. It will only be a couple lines of code.
Looking at bugsnag and it looks very nice.
I dont think I can use the free plan on Heroku though?
Why not? You mean it's not an add-on?
Just an FYI, you don't have the use the Heroku addon. You can go straight to bugsnag and set it up yourself if you want. The addons are just there to make it slightly easier to setup.