XVenture Griplox Waterproof Phone Mount Review: Grip That Holds Through the Waves

If you spend any time on the water, you know the problem: there’s nowhere safe to set your phone on a boat. You rest it on the dash, hit one wave, and it slides across the deck — or worse, it becomes a projectile headed for the lake or the ocean.

The XVenture Griplox Waterproof Phone Mount is built to solve exactly that. It’s a two-part rig: a wide suction base that sticks to your boat and a holder that clamps your phone. XVenture makes it under the Bracketron umbrella, and it sells for $28.99 on Amazon with a 4.3-star average across 273 ratings.

I put this waterproof phone mount through the kind of shaking a choppy lake would throw at it. The short version: the suction is the real deal. This review covers how it grips, how it locks your phone in, and exactly who this phone holder is — and isn’t — for.

What I Liked

Suction that holds through three-foot waves

The suction is the main event here, and it earns that billing. It uses what XVenture calls Temporbond suction technology, and in my testing the phone did not budge through shaking that was rougher than any wave. It even holds on hot days, which is exactly where cheap suction mounts give out and slide off the dash.

Grips curved and textured surfaces other mounts slide off

Most suction cups need dead-flat glass. This one grabs smooth, textured, and even curved fiberglass. You press the lever base down to attach the mount, and it locks onto a console or windshield with almost too much force. Owners even stick it straight onto the curved lens of a car instrument cluster, and it holds.

A low-profile arm with an easy quick-release

The swivel arm is only about 3.5 inches, so your phone isn’t hanging off a long, flimsy stalk. A side button releases the phone in one press, and the whole holder detaches and clicks back in when you want it. That makes the phone mount genuinely easy to use when you’re stepping off the boat.

Fits large phones even in bulky Otterbox cases

The clamp fits smartphones up to 6.75 inches tall and 3.5 inches wide, which covers nearly every modern phone. It swallowed an iPhone 17 Pro Max in a case with room to spare, and it handles a Samsung Galaxy or an older iPhone 13 just as easily. Even a bulky Otterbox or Pelican case fits, so it works as a near-universal phone holder.

Built to live outside in rain, spray, and sun

Unlike indoor or car-cabin mounts and accessories, the whole thing is engineered for the marine environment to keep moisture and sand away from your phone. You can leave this waterproof phone holder on an open dash in the rain and not think twice. It’s also easy to install and easy to maintain — if the cup ever loses grip, you rinse it with water to reactivate the adhesive, and it leaves no residue behind.

What Needs Improvement

It’s a secure mount, not a submersible case

The name says “waterproof,” but be clear on what that means. This is a secure mount for a wet environment, not a sealed pouch you can drop underwater. It keeps rain, spray, and sand off your phone on an open dash, but if you want a fully submersible dry case, this isn’t it.

Suction only holds on a clean, smooth surface

The grip is strong, but it depends on prep. In my textured-surface test, the base held firm while a sticker peeled right off next to it — yet one Amazon buyer still reported the suction letting go and the mount falling off the dash. Every suction cup tells the same story: a dirty, dusty, or loosely pressed surface is where it fails.

The phone clamp arms feel a little fragile

The spring-loaded arms hold the phone securely, but a few owners note they feel a bit delicate during the opening and closing motion. They’ve held up in practice, but I’d avoid forcing them.

Costs more than generic boat phone holders

At $28.99 it isn’t expensive, but it’s pricier than no-name suction holders. It’s also a genuine chore to remove once it’s set — great for security, less great when you want it off in a hurry. If you only need something for calm-water days, a cheaper mount may do the job.

How It Compares

Priced at $28.99, the Griplox undercuts most of the marine competition. The RAM Mounts Quick-Grip with a twist-lock suction base runs about $68 and offers the easiest angle adjustment through its double ball-and-socket arm, but it costs more than double and needs some assembly out of the box.

The SeaSucker Flex-X is the premium option at roughly $85, with a 4-inch vacuum-pump cup and a red warning ring when suction drops. Boating Magazine’s lab test praised its holding power but noted the large base “sacrifices too much visibility.” Mob Armor’s Flex Mount pushes further upmarket with an optional wireless-charging kit — a feature the Griplox skips to keep the price down.

Against generic Amazon suction holders and budget brands like Lisen, the Griplox’s edge is the Temporbond cup that grips textured and curved surfaces most cheaper cups can’t. Cheaper mounts tend to work on flat glass and quit on a fiberglass console.

It’s worth clearing up one comparison, though. Shopping for the best bike phone mounts turns up handlebar clamps from the likes of Quad Lock and Peak Design — a completely different design. A bike phone mount or bike phone holder wraps around a bar, while the Griplox relies on a suction base for a flat-ish surface. If you ride a motorcycle or bicycle and want a smartphone bike mount, look at those clamp-style systems instead; if you have a boat, kayak, jet ski, or a curved car dash, the suction approach is what you want. And for a rugged action-cam rig, a GoPro clamp is again a different tool for a different job.

Final Verdict

The XVenture Griplox Waterproof Phone Mount does the one thing a boat phone mount has to do: it keeps your phone locked down, visible, and dry when the water gets rough. The Temporbond suction is the standout — it grabs smooth, textured, and curved surfaces that defeat ordinary mounts, and it held through shaking well beyond a typical wave in my testing.

It isn’t flawless. It’s a secure mount rather than a submersible case, the clamp arms feel slightly fragile, and the grip still needs a clean surface to do its job. None of that undercuts the core value at $28.99.

I’m rating it 4.2 out of 5. For boaters, kayakers, and jet-ski riders who have nowhere safe to set a phone — or drivers whose curved, textured dashboards reject every other mount — this is an easy recommendation. It’s a well-built piece from XVenture’s Bracketron-backed line of mounts and accessories that solves a real, specific headache. If your phone keeps sliding around on the water, the Griplox is worth checking out.