This app was mentioned in 8 comments, with an average of 1.75 upvotes
Mostly for Players, there's this gem on Android that really helps in tracking all the modifications to your Attack, AC, etc. It takes a few minutes to enter all your data, but then there's no more confusion as what's your actual Attack Bonus after adding Power Attack, Charge, Haste and Flanking bonuses :P
https://play.google.com/store/apps/details?id=com.kennywalter.quickmods
Thanks again /u/k_to_the_w for this great app! :D
I needed exactly what you wanted about a year ago, so I built my own app.
https://play.google.com/store/apps/details?id=com.kennywalter.quickmods
D20 system independent. Multiple character support. Tablet friendly. Modifiers can apply to multiple stats. Dice can be added to both stats and modifiers for auto-rolling results. Modifiers are easily turned on and off. Can keep track of resources e.g., HP, arrows, bombs, potions, etc. Completely free. No ads.
Nice! I do the same thing with all my generated characters in Google Sheets so I can access them from anywhere.
If you need help with some JS, send me a message.
If you're using sheets to help with quick auto calculations and don't want to have to carry your computer around, this might help you: https://play.google.com/store/apps/details?id=com.kennywalter.quickmods
I made this app to work with almost any RPG and it has no ads and is free!
You need an app...
Shameless plug here:
(QuickMods)[https://play.google.com/store/apps/details?id=com.kennywalter.quickmods] - Mine Mutliple Characters - Rolls dice for you (Squire)[https://play.google.com/store/apps/details?id=me.cmrn.squire] - Someone else's Single character No dice rolls
Try a room with carpet and drapes to dampen the sound or meet somewhere else. There are some times when you can't lower the volume during exciting moments. If this guy's switch is always on then it seems like he enjoys the game a lot. Try to accommodate him. He sounds like a player any GM would want to keep.
For Android devices, this little hidden gem has made my life so much simpler; put in your base numbers (attack, dmg, AC, saves, etc), then set up regular buffs (Power Attack, Inspire Courage, etc). Just tick on those that are active and the math is done for you! Never forget a bonus again!
https://play.google.com/store/apps/details?id=com.kennywalter.quickmods
I used to use Squire too and was disappointed by the one character limit. So I built my own app. https://play.google.com/store/apps/details?id=com.kennywalter.quickmods
There's this great indie app that you can use with any rpg to keep track of things, but also bonuses and mods: https://play.google.com/store/apps/details?id=com.kennywalter.quickmods
https://play.google.com/store/apps/details?id=com.kennywalter.quickmods
Like Squire, but supports multiple characters and can auto-roll for you.