If you can't afford it, you can get Waking Up for free. If you can afford it I think it's worth the price.
Waking Up is a great non-mystical type of meditation app. I strongly recommend checking this out if you’re at all turned off by the voodoo surrounding meditation.
I'm personally a huge fan of Waking Up! Have been a long time user. I'm looking to bring a different experience to the table to address the underlying needs of why anyone would want to use a meditation app, or even start to do meditation without one, in the first place
There’s several that if all you want is a breath timer. Sometimes that’s even unlocked on the subscription apps.
But there’s a lot of crappy apps out there.
One can download a good youtube guided meditation video on your phone and play it over and over again while meditating.
Oak. It's only on iOS but it has no subscription and it's by far my favorite meditation app.
Insight Timer. But as another sibling comment mentioned, Waking Up is worth the money; and if you can't afford a subscription, they'll give you a free one.