Garmin Venu 3 vs Venu 4

The two tables, which is the whole argument

Generational comparisons usually need a paragraph of context before the numbers mean anything. This one does not. Garmin publishes a battery table per watch broken down by satellite mode, and the Venu 3 series manual and the Venu 4 series manual can be laid side by side without any interpretation at all. We compare the larger case of each — the 45 mm Venu 4 against the Venu 3 — because those are the variants our live prices track.

Finding one: the older watch wins every row they share

Read the table again and count. Smartwatch mode, battery saver, GPS-only, all-systems, all-systems with music, always-on display: six shared rows, and the Venu 3 states the longer figure in all six. Two of the gaps are small enough to be a different rounding convention — 26 days against 25, 20 hours against 19 — but the headline ones are not. Six GPS-only hours is a quarter of the figure gone, and two smartwatch days is two nights you do not have to put the watch on a charger.

That matters most if you bought a Venu to sleep in it. The real failure mode of watch-based sleep tracking is not algorithmic, it is behavioral: the watch is on the charger at bedtime, so the night is not recorded at all. A watch stating 14 days survives that routine more comfortably than one stating 12, and it is the reason the Venu 3 still holds a place on the subscription-free sleep trackers.

Finding two: what you are buying is a frequency band

The Venu 4's answer to all of that is the one row the Venu 3 table does not have: all-satellite-systems plus multi-band, stated at 17 hours on the 45 mm case and 12 on the 41 mm. The Venu 3 has no multi-band figure because it has no multi-band mode. No firmware update adds a frequency band to a receiver that cannot hear it, which is the same hardware line that decides Forerunner 165 vs 265.

So the honest framing of this upgrade is a trade rather than an improvement. You gain a satellite mode that is designed to hold position between tall buildings and under tree cover — the specific hardware that addresses GPS drift — and you pay for it with roughly a fifth of the stated endurance in the modes you already had. If your tracks look fine today, you are paying for a fix to a problem you do not have. If they wander, this is the only thing on this page that actually addresses it. What dual-band reception is and is not good for is in what is dual-band GPS.

Finding three: the Venu 4 is documented as a different kind of watch

The specification change is modest. The documentation change is not. Garmin's Venu 4 manual lists, in its Training section index, PacePro, race calendar and primary race, a critical swim speed test, performance measurements, training status, acute load, training readiness and recovery time, with VO2 max. standard ratings and running dynamics data in the appendix. That is the Forerunner analysis stack, which is why this site files the Venu 4 with the running watches and the Venu 3 with the sleep trackers.

Garmin's Venu 4 announcement also names an ECG app, a health status feature that watches whether heart rate, HRV, respiration, skin temperature and Pulse Ox drift from their usual overnight ranges, lifestyle logging of choices such as caffeine and alcohol against sleep and HRV, sleep alignment and sleep consistency scoring, an LED flashlight, a spoken watch face and color filters for color blindness. Two caveats belong next to that list, and both are Garmin's own: health status is "currently in beta", and the ECG app requires the latest software and is available in select regions only, for ages 22 and over. We are listing what Garmin publishes for the Venu 4, not asserting that the Venu 3 lacks each item — we have read no comparable feature release for the older watch, and an absence from our reading is not an absence from the product.

What is identical

Both watches are rated "Swim, 5 ATM" in their own specification pages. Both use Garmin's wrist optical sensor. Both carry a speaker and microphone, Body Battery, HRV status, Pulse Ox and sleep tracking, and both pair external ANT+ and Bluetooth heart rate straps — which is the only upgrade path on this page with published evidence behind it. Neither has a subscription of any kind, which is increasingly unusual in this category and is worth more than most of the feature list.

The arithmetic

Per stated hour in each watch's best satellite mode — all-systems on the Venu 3, all-systems plus multi-band on the Venu 4 — the Venu 3 runs $12.00 and the Venu 4 $31.94. The live gap between the two listings is $303.

Those two cost-per-hour figures are not strictly like for like, and we would rather say so than quietly hide it: the Venu 3 number describes a single-frequency mode and the Venu 4 number describes a dual-frequency one, which is the better mode. The comparison that is like for like is the all-systems row, 20 hours against 19, and on that row the older watch is both cheaper and longer-lived.

The evidence, which has not moved between generations

Nothing either of these watches produces has been independently validated. The point is worth making precisely, because sleep and recovery features are the reason most people buy a Venu:

• Garmin was absent entirely from the 2024 inpatient polysomnography comparison that tested an Oura Ring, a Fitbit and an Apple Watch on the same 35 people on the same nights. There is no published head-to-head of Garmin sleep staging against a sleep lab, on either generation.
• In the 536-night ECG validation of five wearables, the Garmin came fourth of five on nocturnal HRV at 0.87 concordance and 10.52% error — agreement the authors called poor — and was dropped from the resting-heart-rate comparison because its 30-minute measurement window is not timestamped. HRV status and Body Battery on both of these watches rest on that signal.

On our published rubric the two land within a rounding error of each other, and the older watch edges it: the multi-band receiver the Venu 4 adds is worth less under our weights than the endurance it costs. That is a judgment from the documented specifications, not a measurement — the whole method is at how we rank, and what Garmin's sleep numbers are and are not built from is in sleep tracking accuracy by device.

Which to buy

Buy the Venu 4 if your GPS tracks drift and you want the multi-band mode that addresses it, if you want the documented training stack, or if the ECG app is available where you live and matters to you. Our full write-up is the Venu 4 review, and fēnix 8 vs Venu 4 sets it against the watch that doubles its endurance.

Buy the Venu 3 if it is the sleep and recovery watch you are after, if you want the longest stated battery in the line, or if the live gap between the two listings is wide. Nothing in the published record says the newer watch measures you better, and the older one asks less of your charger. Our write-up is the Venu 3 review.

Buy neither if sleep staging is the whole reason you are shopping. The only device in this category with a favorable published result against clinical polysomnography is a ring, and that comparison is smart ring versus watch for sleep tracking.