The phrase "spare you from" is correct and usable in written English. You can use it to express being saved from, or avoiding, a particular experience or outcome. Example: "I'm grateful that I was able to spare you from having to go through the same difficult experience I did."
What does that spare you from?
To spare you from all those last-minute under-catering panics and over-catering irritations?
A voice-activated television remote, for example, can spare you from having to remember hundreds of channel numbers.
Bad weather can spoil the best vacation; or it can spare you from doing things that wouldn't have been much fun, anyway.
"I'm going to spare you from a lot of my speech that I'm going to give a little later on," Mr. Bush said.
The atrium's compressed, almost intimate monumentality states that Moneo knows everything there is to know about museum fatigue, including how to spare you from it.
The animation spares you from all that; you're not looking at actual people saying silly things, after all.
Yet in late 2013, Twitter briefly changed the "block" function so that, instead of preventing abusive users from interacting with you, it simply spared you from seeing their tweets.
And not because he thinks the Jews caused 9/11 or because he threatened to report us for sexual abuse for trying to hug him, which, for what it's worth, I spared you from, Rachel.
The truth is, success spares you from the shame you might experience if you feel yourself a failure, but career success alone does not provide positive peace or fulfillment.
This 80-pound panoramic display spares you from seeing your cubicle walls, windows or the clock on the wall; your spreadsheet, flight simulator or sextet of Web pages virtually surrounds you.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union