Your post got me thinking so I did a search and came up with a few. I guess what's best for you depends on whether you have IOS or Android.
https://itunes.apple.com/us/app/car-minder-plus-car-maintenance/id310809791?mt=8
This looks pretty good if you're an apple guy.
http://appcrawlr.com/android-apps/best-apps-car-maintenance
Here's a site with a ton of Android apps. I just don'y have time to check them all out right now.
Well what are we paying you for ?
This is probably not what you want to hear. "Spiral notebook", with a page for each piece of equipment. Log maintenance, reminder page on the front with dates, mileage and piece of equipment. Permanent record. Keep it in the house. History always available. Not lost when you drop your phone in the toilet. Does not rely on the cloud. Requires no electricity. Take a picture and email to yourself. Use your Outlook to send you a reminder to check your notebook monthly. Might even use a real paper calendar :thumbsup:
Spiral notebook in each vehicle, all important "stuff" wrote down. "Bad bathrooms at exit 84" "Best diesel on 72" oil changes, lubes, parts etc.
I've been carrying a personal computer since about 1995, started with a radio shack TRS-80 Model 100, quickly graduated to an HP 95. A computer is like a woman, love the one your with. My collection of notes on HP95's, PDA's, tablets, and now Android phones are great FOR ME. But not good for many other people.
I show my favorite mechanic my notes on when stuff got changed on my dually and he understands a spiral notebook. He "don't know" email. And if you need to leave a note for someone you can leave a piece of paper. You need to draw someone a map, do it on paper.
There's a lot I can do with a "pocket computer". I was running Unix mapping computers fielded in Tuzla, BH using an HP100 from a hotel room in Lititz, Pennsylvania in 1997. But I still record my fuel, oil, and mileage for every vehicle in a spiral notebook.
Pen and paper still have their place.