Coros's trail-focused Apex line has always occupied a specific niche: much cheaper than the top Garmin models, with battery life considerably better than anything in its price tier, and an operating system that was, if you were being polite, idiosyncratic. The fourth generation of the watch, which arrived in shops in March at $479, is the first version that no longer requires an apologetic caveat. The new Apex 4 keeps everything its predecessors did well — very long battery life, a light titanium bezel, an uncluttered physical interface — while fixing, at last, the mapping and interaction problems that stopped earlier models competing with the Garmin Fenix 8.
Battery life remains the headline number and the headline argument for buying one. Coros quotes 65 hours of all-systems GPS tracking, 53 hours of dual-frequency GPS and 41 hours in its higher-accuracy "Max" mode, with an overall smartwatch life of around 24 days. On our 46mm test unit those figures were close to accurate in typical usage: a 38-hour weekend of continuous tracking across the Peaks left the battery at 29 per cent, with sleep and heart-rate monitoring still running. That puts the Apex 4 slightly behind the top Garmin trail watches on raw battery life but well ahead of the Suunto Race S and the Polar Vantage V3 at comparable price points.
The mapping experience is where Coros has really caught up. A dedicated third button on the left flank of the 46mm case now opens the full colour map directly from any activity screen — no nested menus, no mode switching — and the back-end map renderer has been rebuilt to load tiles considerably faster, which Coros quotes as "thirty times" faster than the Apex 2 Pro. Panning and zooming are now visibly smoother, and the breadcrumb trail overlays on top of ordnance-grade topographic data on-device without needing to rely on the phone app. The turn-by-turn voice-and-vibration navigation also picks up and recovers more reliably after a momentary GPS dropout, which in our testing was one of the more noticeable regressions on the Apex 2 generation.
What Coros has not changed is the screen technology: the Apex 4 retains a Memory-in-Pixel (MIP) display rather than the AMOLED panels now standard on the Garmin Epix, the Apple Watch Ultra and the Polar Grit X2. This is a deliberate choice aimed at long-battery users — MIP is always-on, costs almost nothing in power terms and is readable in direct sunlight — but it does mean the watch looks notably less "premium" than $500 rivals when held next to them indoors. A second design note: the 42mm version is much more wearable in everyday settings than its predecessor, and in practice the smaller case will suit many road-first runners who still want Coros's battery headroom.
The broader question the Apex 4 prompts is whether runners who only occasionally venture off-road really need a watch of this class at all. Our answer, after six weeks of testing, is the same as it has been for previous Apex generations: for road-first runners, the Coros Pace Pro remains the more rational purchase. But for ultramarathoners, multi-day hikers and anyone who genuinely wants to navigate from a wrist map in the mountains, the Apex 4 is — for the first time in the line's history — a legitimate alternative to the Garmin Fenix 8, at roughly two-thirds the price. Coupled with Coros's deliberate "no subscriptions, no soft paywalls" policy around training features, that is a meaningful shift.