Judge42 is a MTG rules document viewer. The Comprehensive Rules, Infraction Procedure Guide, Magic Tournament Rules, and Judging at Regular documents are all included.
Each document can be browsed through a hierarchical menu system in order to locate specific sections quickly. All documents can be searched simultaneously or individually as well.
Extensive formatting from the original documents is kept intact, and additional color highlighting allows the documents to be even more readable.
Hotlinks in the Comprehensive Rules allow quick navigation between various rules sections.
There is no external database to update. All documents are included inside of the app itself and will update as the app updates.
Also included in the menu is a handy decklist counter for verifying deck totals, as well as a draft timer.
Also a great replacement for MTGJudge (MTG Judge) which is no longer kept up to date.