I am using Papertrail add-on on Heroku for viewing the logs.
It has a free plan which is enough for small application. It gives you flexibility for searching your logs by text and time. A browser URL is provided by Papertrail to view the logs, which is convenient to access from mobile also. Adding this add-on to your application is quite simple, no app changes are required. Below filters are available out of the box on its dashboard to view the logs-
- All events
- Deploys
- Dyno state changes
- Platform errors
- Web app output