I highly recommend Skinomi's TechSkin protectors: http://www.skinomi.com/fitbit-charge-3.html. They come in plain (glossy) and matte styles, for those that would like some glare reduction, six to a pack for the low low price of $7.85. 
There's also a newer style with a notch on either side for the charger, but that's really not a necessity if one applies the charging clip with moderate care. (They also have full body kits if you want to swathe your C3 in all-over protection, or give the chassis a new look--woodgrain, anyone? 
)
I have the plain style glossy TechSkin on my C3; took all of five minutes to apply, didn't even take it off my wrist. I've used Skinomi's products on a variety of smartphones, and can testify that they do their job very well. Their products make it simple to add a reassuring layer of protection, Gorilla Glass 3 notwithstanding.
I hope this info helps anyone looking for a reliable C3 screen protector.
Happy Year of the Pig (noink!) to all!
IchibanNeko
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My charge 3 screen is also scratched, I received my fitbit as a gift on November 23rd 2018. I had been using my fitbit for roughly 3 weeks when I noticed my screen was scratched, I know exactly how this was caused too. I was cleaning my laminate flooring and picked something up from under my sofa with my watch facing down which meant I rubbed my fitbit on the floor. Having gorilla glass I didn't think this would cause the scratches that it has. My old charge 2 screen was loads tougher. I'm very disappointed with the charge 3 now and the display looks awful now its badly scratched 😞.
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@Differ12 wrote:I've always been really pleased with fitbit customer service. Over the years when I've had previous issues they have helped in every way even to the point I've had a fitbit replaced. I normally email them directly though and don't usually bother with these forums because it seems people don't get their issues resolved. I posted about my charge 3 showing that it does get scratched and quite easily too in my experience 😔
I never thought about returning it under the 45 day return policy either purely because I thought I was at fault. As I say my charge 2 has been bashed about in the 2 years that I've used it and the screen is still perfect. I would like a response from fitbit though has to why my gorilla glass/scratch resistant charge 3 has scratched so easily 🤔
Unfortunately all it takes is a single particle of grit or sand between the screen and whatever surface it makes contact with to scratch it. This applies to any glass including Gorilla glass, make contact with something harder and it will scratch. As I said though, it might not actually be the surface (laminate flooring) but the small particles of grit/sand on the surface that actually caused the damage. A more scratch resistant material would be sapphire crystal, but fitbit doesn't offer this as an option and the manufacturers that do charge a premium for it.
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My Versa 3 screen is supposedly Gorilla glass and seems extremely easy to scratch. I accidently touched against the edge of a piece of glass with no sharp edges and this is the result
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