Budget freediving computers in 2026: what everything costs

What does a freediving computer have to do?

Strip away the marketing and the job is pretty small. It has to know how deep you went, how long you were down, and how long you've been back on the surface. It has to warn you at a depth you picked, on your wrist, where you can feel it. And it has to keep a log, because in freediving you improve over a season, not dive by dive.

The surface interval matters most, and spec sheets barely mention it. Blackout risk builds up over a session. The dive that gets you is rarely the deepest one. It's the eighth one, after eight rests that were each a little too short. A watch that times your dive but doesn't work out your recovery is only solving the easy half of the problem. That's how we've looked at everything in the tables below.

What does a new freediving computer cost in 2026?

Every model here is a watch you wear on your wrist, with a freedive or apnea mode built in. No phone or app needed. These are official retail prices from each manufacturer's own store, checked on 30 August 2026 and sorted from cheapest to most expensive.

Three things that table makes obvious

Depth ceiling does not track price. The $399.95 Mares Smart Apnea shows depth to 150 m. The $799 Suunto Ocean stops at a 60 m operating limit, and you can't set its depth alarm past 59 m. The $799 Apple Watch Ultra 3 is capped at 40 m, and that's a limit Apple sets, not an app setting. So for freediving, the two most expensive general-purpose watches on the list are the ones with the shallowest limits.

Watch-shaped is not the same as daily-wearable. Shearwater's Tern and Teric are good-looking round watches and excellent dive computers, but they don't do phone notifications or activity tracking. If you were hoping for one watch for diving and everything else, they're not it, and the Suunto D5 isn't quite either.

There is no cheap end. The cheapest wearable with a built-in apnea mode costs $399.95, and the cheapest one from a manufacturer's current lineup is the Descent G1 at $549.99. Nothing in this category is built to a budget, which is exactly why the second-hand option below deserves the attention almost nobody gives it.

The Apple Watch already proved the cheaper idea works

Look at what the Apple Watch Ultra is doing on that list. It doesn't have a built-in dive mode at all. It's a general-purpose smartwatch that becomes a dive computer because an app, Oceanic+, turns its pressure sensor into one, and Apple built the hardware to a 40 m rating so the app could be certified to EN 13319. The most mainstream dive computer on sale today is a fitness watch plus software.

So the idea that a sports watch running an app can't be a freediving computer has already been put to rest, by Apple, Oceanic and a few hundred thousand divers. The real question is what it should cost.

Apple's answer is $799 for the current Ultra 3, with freediving mode behind a $4.99/month Oceanic+ tier. That's separate from the scuba subscription, and it isn't in the free tier, which only covers snorkeling. There's no yearly freedive plan and no lifetime unlock, so that's $59.88 a year for as long as you dive. If you buy a used Ultra 2 instead, at its going rate of about $362, five years of freediving costs you $661 all in. It's a good product, but it isn't cheap, and it stops at 40 m.

The same idea, at a fraction of the price: a used Garmin Fenix 5 Plus

The Garmin Fenix 5 Plus family (the 5 Plus, 5S Plus and 5X Plus) pulls off the same trick as the Apple Watch for a fifth of the money, thanks to two things that happen to line up.

The first is the sensor Garmin put in them. A teardown of the Fenix 5 found that its pressure sensor is a TE MS5837-30BA. That isn't the MEMS altimeter chip you'd expect in a running watch. It's a 30-bar part, rated for roughly 300 m of water, from the same family of sensors used in purpose-built dive computers, and its datasheet says it stays within ±0.5 m down to about 50 m. Garmin never advertised this, and for the Fenix 5 Plus we're going by how it behaves, not a teardown of its own. But it explains something that surprises people: a fitness watch from this era reads depth properly instead of getting stuck near the surface. Our own per-watch measurements back that up.

What limits how deep you can take one is the case, not the sensor. The app's depth alarms go to 40 m to match the case rating, which is deeper than the $799 Apple Watch Ultra 3 is certified for. For line training, spearfishing and working comfortably at 20 or 30 m, the watch reads everything you're doing.

The second is that a previous-generation flagship costs almost nothing. A working Fenix 5 Plus usually sells for around $120. That's less than a third of the cheapest new wearable with an apnea mode, and under a tenth of a Descent Mk3.

And then the app does things the dive computers do not

This is where price stops being the point. A dedicated freediving computer is a very good depth gauge with a recovery timer attached. inDepth Apnea Blue and inDepth Apnea Pool, both free and both running on the same $120 watch, add up to a whole training setup.

Put that table next to the price table at the top of the page, and together they make the whole argument. On the things freedivers do most (resting properly between dives, training in the pool, following a workout and keeping a season's worth of history), a $120 Fenix 5 Plus does more than a $1,600 Descent. You get five surface-rest models instead of one timer, and full pool training with automatic turns and splits. Build a workout on the couch and swim it on Tuesday. It all goes into a phone app that belongs to you, with no account to create and nothing to renew.

The expensive computers earn their price on things that aren't freediving: scuba certification, deep case ratings, air integration and dive modes for gas mixes. If you need those, buy one. If what you do is hold your breath, it isn't even close.

What it costs, all in

Even against the cheapest new watch in the whole category, going the used Fenix route saves you $280. Against the watch most people actually want, the Descent Mk3, it saves you more than a thousand dollars. Put that toward a decent pair of fins, a good lanyard and a course. Any of those will do more for your diving than a computer at any price.

A quick note on used prices, since guides like this tend to quote whatever number helps their case. eBay's sold listings are behind a login, so the "used prices" you see published are almost always what sellers are asking, and that's higher than what watches actually sell for. The figures below are the typical second-hand price for each model, as of 30 August 2026. They're a snapshot, not a quote.

How to buy a used Fenix 5 Plus without getting burned

• Ask for a photo of the charging contacts. Corroded charging pins are the known weak spot on this generation, and Garmin has quoted around $180–200 to repair one, which is more than the watch is worth. If the contacts are green or pitted, walk away.
• Ask the seller to press every button on video. Sticky start/stop buttons are the other known fault. They come down to the seals, which matters more than usual on a watch you plan to take underwater.
• Have the seller remove it from their Garmin account. Garmin watches work fine for a new owner even if the old one does nothing, but a clean handover saves confusion later. Ask for the original receipt if there's any warranty left, and check that the serial number is intact.
• Which one to get: the 5 Plus (47 mm) is the best value and usually the cheapest of the three. The 5S Plus is the smaller 42 mm version, and the 5X Plus is the 51 mm one, which is big on most wrists. All three read depth the same way and run both inDepth apps. The non-Plus Fenix 5, 5S and 5X often aren't any cheaper, and they have less memory, so inDepth Pool doesn't run on them at all.

What is the cheapest freediving computer worth buying in 2026?

At full retail, the Mares Smart Apnea at $399.95 is the cheapest wearable watch with a built-in apnea mode, and the Garmin Descent G1 at $549.99 is the cheapest one from a manufacturer's current lineup. Both are good watches. Both are also beaten on value by a used Fenix 5 Plus at around $120 running a free app. It does the same freediving job (depth, dive time, surface-rest modeling and a log) for roughly a quarter of the price, and adds pool apnea, which neither of them does. Prices checked 30 August 2026.

Can you use a Garmin Fenix as a freediving computer?

On the Fenix 5 and Fenix 5 Plus families, yes, with a third-party app. Those watches report true depth to Connect IQ apps, because Garmin fitted them with a 30-bar dive-class pressure sensor instead of an altimeter chip (see our per-watch measurements). An app like inDepth Apnea Blue turns that into automatic dive detection, live depth, depth alarms, surface-rest models and a dive log. It isn't a certified dive computer, though. The case has a 10 ATM water rating, not the EN 13319 dive rating a dedicated unit has, and there's no built-in dive mode. Not every Garmin can do this, and the pricier ones aren't automatically better at it. Read the per-watch measurements before you buy anything.

Is it safe to buy a used dive computer or dive watch?

Lots of people do, but the water seal is the one part you can't inspect and no seller can guarantee. On a used Fenix 5 Plus, the checks in the section above are the ones that matter: corrosion on the charging contacts, every button pressing all the way through, and moisture marks around the edge of the screen. Those are the known weak spots on this generation, and a corroded charging port is a $180–200 repair, more than the watch is worth. Ask the seller to remove the watch from their Garmin account before it ships.

Do you need a dive computer for freediving?

For a single shallow dive, no. For repeated depth dives, something needs to track your depth, your dive time and your surface interval, because, as we covered above, the risk builds up over the session, not within one dive. Whether that's a $1,600 Descent or a $120 used watch running a free app matters less than whether you're checking a rest countdown before you go down again.