The truth is that smartphones peaked a few years ago.

After so many advances, the miniature computers have reached incredible speeds, their screens have become bigger and brighter, and their cameras produce images that make amateur photographers look like wizards.

The problem with so much great innovation is that upgrades are now so iterative that it has become difficult to know what to write about them each year. That’s especially the case with Apple’s iPhone 13, which may be the most incremental update ever to the iPhone.

The newest iPhone is just 10 percent faster than last year’s models. (For context, in 2015, the iPhone 6S was more than 70 percent faster than its predecessor, the iPhone 6.) Its flashiest new feature, a higher screen “refresh rate” on the $1,000-plus models, makes motion look smoother when opening apps and scrolling through text — hardly a game changer.

Innovations on smartphone cameras also appear to be slowing. Apple executives described the iPhone 13 cameras as “dramatically more powerful” and the iPhone’s “most advanced” ever, largely because they can capture more light and reduce noise. But in my tests, the improvements were marginal.

This is all to say the annual phone upgrade, which companies like Apple and Samsung tout with enormous marketing events and ad campaigns to gin up sales for the holiday shopping season, has become a mirage of tech innovation. In reality, the upgrades are now a celebration of capitalism in the form of ruthless incrementalism.

What better way to illustrate that slow march than with smartphone photos? To put the iPhone 13 cameras to the test, I bought a special tripod to hold two phones side by side so I could snap roughly the same photos of my dogs at the same time. I compared shots taken with the new iPhones, last year’s iPhone 12 and a three-year-old iPhone XS.

When I got the results, I was genuinely surprised by how well the iPhone XS camera stood up against the newest models. And the iPhone 13’s camera was just barely better than the iPhone 12’s.

Enough words. Let my dog photos guide you on the latest iPhone.

To compare photos shot in daylight, I took all the phones and my dogs, Max (he’s the smaller corgi) and Mochi (she’s the brown Labrador), to a park in Richmond, Calif. In one test shot of them sitting next to each other in the shade, the iPhone 13 and 12 photos were hardly distinguishable. The iPhone 13 did a somewhat better job capturing shadows.

The iPhone 13 cameras also have a new video feature called cinematic mode, which uses algorithms to automatically focus on faces — even those of my dogs — as they move around. I’d be hard pressed to imagine why a person with no ambitions to become a filmmaker would use this mode, but I can think of a few TikTokers who might like it.

So in summary, the iPhone 13 cameras are slightly better than those of last year’s iPhones. Even compared with iPhones from three years ago, the cameras are much better only if you care about taking nice photos in the dark.

Just how important is night photography? I posed the question to Jim Wilson, a longtime staff photographer for The New York Times, as he was taking pictures of the new iPhones for this review. He said it would be a crucial feature for people like him, but not as important for casual shooters.

“Sometimes I wait until the night to make an ordinary scene look different and exciting,” he said. “But for most people who aren’t professional photographers, this is of no consequence.”

The fact that the smartphone has plateaued is not a bad thing. It means you can enjoy the one you have for years to come without missing out on anything major. And when it feels right to upgrade, you are in for a piece of mature technology that is incrementally — though not dramatically — better.