Watch VideoKospet Tank M4 Review: A rugged smartwatch optimised for iPhone

The Kospet Tank M4 is a rugged, iPhone-optimised smartwatch with excellent battery life, strong fitness tracking and seamless Apple Health integration that delivers premium features at a fraction of flagship smartwatch prices. Picture: Michael Sherman/IOL I’ve been using the Kospet Tank M4 since the beginning of January and, despite never having heard of the brand before being offered one to review, it has quickly become my favouritesmartwatch. There are a few irritations worth addressing upfront, some of which may come down to personal preference.

However, the Tank M4 delivers far more than its price tag suggests. The name isn’t marketing fluff. The Tank M4 is heavy.

Really heavy. It took time to adjust to wearing a watch this substantial since its body is made from durable stainless steel, especially coming from a lighter plasticGarmin running watch. Once I stopped making that comparison, however, the weight became a non-issue.

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This rugged build makes sense when you consider that the M4 is billed as a diving watch, and durability is clearly its core design focus. It’s not a fashion-first smartwatch — it’s built to survive punishment. Despite its size, I’ve used the Tank M4 successfully on all my runs.

Accuracy has been on par with other smartwatches I own, and GPS tracking has been reliable. That said, there are some frustrating omissions. I’m yet to work out how to get the watch to notify me — via vibration or sound — at each kilometre marker during a run.

For someone pedantic about pacing, this is incredibly annoying, especially since most smartwatches enable this by default. Some activity settings are also buried deeper than they should be, making customisation less intuitive than rivals like Garmin or Apple. Where the Tank M4 truly shines isiPhonecompatibility. The user interface will feel familiar to anyone who’s usedHuaweiwatches running HarmonyOS, such as the Watch Fit 3 or Watch 4 Pro, but here it’s fully customisable and — crucially — plays nicely with Apple’s ecosystem.

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