I read a Medium article that experimented with 5 cat repellers. The author did not merely browse product reviews; they literally performed practical experiments to determine what was effective and what fell short. It was like someone did the dirty work for us. Read more now on medium.com/@john-gardener/5-best-cats-repellers-i-tried-them-all-d62c1715c811.

Their opening experiment was a sensor-triggered spray device. Imagine a burglar alarm, except it sprays a jet of water on your plush neighbor’s feline. The article reported it worked immediately. Cats can’t stand sudden showers. The drawback? Even your own footwear could get soaked, and you might forget about it.
The next repeller was an high-frequency sound machine. It produces tones that are high-frequency and audible only to cats. The article said the concept sounded great, but the performance? So-so. Some cats bolted, while others remained unfazed like judgmental professors, no doubt criticizing humanity for pointlessly using energy.
Next in the test series was a scent-based repellent in the form of pellets. Think of it as a line of defense made of smell. According to the article, it worked for a while in flowerbeds, but it didn’t survive bad weather. That meant regular refills, which turns pricey over time. Good only for short-term use, not a permanent solution.
The fourth test involved spiky floor mats. Not painful, just awkward. When a cat steps on it, they quickly conclude, “No thanks, the grass is better.” The product is low-cost, simple, and works well, but not visually appealing. Imagine having guests over and needing to clarify why your yard looks full of landmines. Still, it does its job.
The final product was a roller-bar system, a rotating bar that spins when cats attempt to climb. They drop down, not injured, but thwarted. Reading about it was entertaining, almost like a funny fail video, where the cat keeps failing before walking off in pride.