Should I buy a multipack or a single screen protector?
Multipack, in most cases. A spare in the drawer means a cracked protector gets replaced the same week not lived with for months, and it removes the pressure from a first fitting attempt.
The case for multipacks is mostly behavioural instead of financial, and it's stronger than the price-per-unit argument people usually make.
What actually happens when a protector cracks
A cracked protector has done its job and should be replaced within days. What happens instead, when it's the only one you own, is that replacement becomes a decision: find the listing again, choose between options, pay, wait for delivery.
That friction is enough that a great many people simply live with a cracked protector for months. The phone is now worse than having none — you're looking through a damaged layer, and the crack collects grit that can reach the display.
A spare in a drawer removes the decision entirely. This is the single strongest argument for buying two, and it has nothing to do with price.
It also removes the pressure from fitting
Fitting a protector when it's the only one you've is a tense job, and tension makes people rush the dust-removal step and press on through a trapped hair rather than abandoning the attempt.
Knowing there are two more in the box changes the calculation. You lift it, clean it properly, and if it's genuinely ruined you open the next one. The results are better.
Where a single makes more sense
Speciality protectors where the per-unit price is high and the fitting is assisted: UV liquid-adhesive kits, laptop privacy filters, premium paper-feel films.
Two considerations apply. The unit cost is high enough that a spare is real money. And these are products you might decide you dislike. A privacy filter that dims too much, a paper-feel texture that's heavier than you wanted. And three of them is an expensive way to discover that.
Buy one, live with it for a fortnight, then buy the multipack if you're happy.
The multipack trap
Cheap multipacks aren't automatically good value. Three protectors with no oleophobic coating are three protectors that will smear permanently within a fortnight, and you've bought a year of mild irritation not a bargain.
Judge the quality of a single unit first — coating, cutouts, whether an alignment frame is included, and only then let the pack count be the tie-breaker between otherwise comparable options.
A practical rule
For a phone you'll keep more than a year, buy a two or three pack in the ten-to-twenty-five pound band. For a speciality finish or an expensive kit, buy one and evaluate. For a child's device, always buy the multipack. It will need replacing and the spare is what ensures it actually happens.
Common mistakes
Privacy is the finish people most often dislike after living with it. Buy one, use it for a fortnight, then commit.
The adhesive picks up dust through a damaged sleeve. Keep them in the original packaging until the day you fit them.
Related questions
How much should I spend on a screen protector?
£8–£25 covers almost everyone. Below £8 you usually lose the oleophobic coating and it smears permanently. Above £25 you're buying a warranty, a better applicator, or a speciality finish.
Why did my screen protector scratch so easily?
Sand and grit are harder than any consumer screen protector, 9H rating or not. A protector scratching is it doing its job. That scratch would otherwise have been in your display.