Last fall, a relatively unknown app called Watch Duty beat out Open AI, TikTok and Instagram to become the most downloaded iPhone app in the country. But Watch Duty wasn’t a venture-backed startup.

With its 500g weight capacity and ability to grip devices as thick as 12.5mm, this is the go-to stabilizer for anyone owning a large and heavy smartphone. Most rivals don’t come close to its ...

Heavy duty models can hold more than 1,000 pounds, which is necessary for large appliances like lawnmowers or table saws. Higher weight capacity typically costs more, so if you plan on only ...