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For most iPhone owners, the Apple Watch SE 3 remains the safest replacement for itself. It offers the tightest iPhone integration, GPS and 5ATM water resistance, but its battery is measured in hours rather than days. Choose the Garmin vívoactive 6 for a longer-lasting all-rounder, the Garmin Forerunner 165 for structured running, the Amazfit Active 3 Premium for the strongest price-to-battery trade-off, or the Samsung Galaxy Fit 3 for inexpensive basic activity tracking.
The right choice depends less on a feature checklist than on which compromise you can tolerate: iPhone-only integration, frequent charging, less precise location data, fewer training tools or a simpler smart-device experience.
Apple Watch SE 3 alternatives at a glance
The table compares the published figures and capabilities available for each model. Battery estimates are manufacturer or publication figures, not guarantees; use patterns, display settings, cellular use and GPS recording can change real-world results.
| Model | Published price | Battery claim | GPS | Best fit |
|---|---|---|---|---|
| Apple Watch SE 3 GPS | $249 starting price | 18 hours standard; 32 hours in Low Power Mode with sleep tracking | Built-in GPS | Closest overall match for iPhone owners |
| Apple Watch SE 3 GPS + Cellular | $299 starting price | 18 hours standard; 32 hours in Low Power Mode with sleep tracking | Built-in GPS | iPhone users who need the cellular version |
| Garmin vívoactive 6 | Price not established in the cited comparison | Up to 11 days | Built-in GPS | All-around fitness with long battery life |
| Garmin Forerunner 165 | Price not established in the cited comparison | Roughly a week | GPS included | Runners who prioritize training tools |
| Amazfit Active 3 Premium | $169 in the cited US comparison | Up to 12 days | Not specified in the cited comparison | Budget and battery value |
| Samsung Galaxy Fit 3 | $59 in TechRadar’s table | Up to 13 days | No GPS; location requires a phone | Low-cost, basic activity tracking |
The Apple figures come from Apple’s current comparison listing and its battery notes describing July–August 2025 testing of preproduction devices. The other figures are reported by 2026 comparisons from TechRadar or Tom’s Guide.
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- Designed with a bright AMOLED display, get a more complete picture of your health, thanks to battery life of up to 11 days in smartwatch mode
- Body Battery energy monitoring helps you understand when you’re charged up or need to rest, with even more personalized insights based on sleep, naps, stress levels, workouts and more (data presented is intended to be a close estimation of metrics tracked)
- Get a sleep score and personalized sleep coaching for how much sleep you need — and get tips on how to improve it; key metrics such as HRV status help you better understand your health (data presented is intended to be a close estimation of metrics tracked)
- The smart wake alarm gently vibrates to wake you at the right optimal time
- Find new ways to keep your body moving with more than 80 built-in indoor and GPS sports apps, including walking, running, cycling, HIIT, mobility, swimming, golf and more
Start with iPhone compatibility
When the Apple Watch SE 3 is the least-compromised option
The SE 3 is the only choice in this group explicitly identified as iOS-only. That restriction is also its advantage for an iPhone owner who wants the most integrated experience. TechRadar’s 2026 assessment calls it the fitness tracker it would recommend for iPhone users, while describing Apple Watch as the “gold standard” for that audience.
Select the SE 3 when notifications, Apple-facing services and a familiar iPhone setup matter more than multi-day endurance. The GPS version is the lower starting price; the GPS + Cellular version costs more and is the relevant option when you need the watch’s cellular configuration. Cellular service can depend on your carrier and region, so confirm eligibility before ordering.
When a cross-platform watch makes more sense
The Garmin vívoactive 6 is explicitly listed as compatible with both Android and iOS. That makes it the most flexible recommendation if your household uses different phone platforms or you may switch away from an iPhone. The Forerunner 165 is presented as an SE 3 substitute for runners, but the cited material does not establish a complete platform-compatibility specification for it.
The Amazfit Active 3 Premium and Samsung Galaxy Fit 3 comparisons establish price, endurance and basic tracking information, but do not provide enough detail here to promise the same iPhone integration as an Apple Watch. Treat phone compatibility, notification behavior and app requirements as purchase checks rather than assumptions.
Battery life is the biggest practical difference
What the SE 3 figures mean
Apple reports an 18-hour standard battery test for the SE 3 and a 32-hour Low Power Mode test that includes sleep tracking. Those results came from preproduction devices tested in July and August 2025. Apple cautions that “Battery life varies by use, configuration, cellular network, signal strength, and many other factors; actual results will vary.” In practice, the SE 3 is a watch you should plan to charge every day or build charging into your routine.
What multi-day claims change
The vívoactive 6, Forerunner 165, Active 3 Premium and Galaxy Fit 3 all target substantially less frequent charging than the SE 3. The published claims range from roughly a week to nearly two weeks. That matters if you want uninterrupted sleep records, travel without a charger, or long training blocks.
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- Designed with a bright AMOLED display, get a more complete picture of your health, thanks to battery life of up to 11 days in smartwatch mode
- Body Battery energy monitoring helps you understand when you’re charged up or need to rest, with even more personalized insights based on sleep, naps, stress levels, workouts and more (data presented is intended to be a close estimation of metrics tracked)
- Get a sleep score and personalized sleep coaching for how much sleep you need — and get tips on how to improve it; key metrics such as HRV status help you better understand your health (data presented is intended to be a close estimation of metrics tracked)
- The smart wake alarm gently vibrates to wake you at the right optimal time
- Find new ways to keep your body moving with more than 80 built-in indoor and GPS sports apps, including walking, running, cycling, HIIT, mobility, swimming, golf and more
A longer estimate does not automatically make a device better. Battery figures can be measured with different settings and usage assumptions, and the cited comparisons do not provide one standardized test across all models. Ask whether your intended use includes continuous heart-rate measurement, frequent GPS sessions, a bright display, notifications or cellular connectivity; each can reduce endurance.
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GPS and location tracking
Built-in GPS for outdoor workouts
The SE 3, vívoactive 6 and Forerunner 165 are presented with GPS. That lets you record outdoor routes without relying entirely on a phone. For a runner, cyclist or hiker, built-in GPS is usually the decisive difference between a watch designed for independent workouts and a basic band that only records activity when the phone is nearby.
GPS quality is not identical across watches
TechRadar describes the vívoactive 6’s heart-rate tracking and GPS precision as weaker than some other Garmin models. That is an important qualification: the presence of GPS does not guarantee the same route accuracy or pace stability as a more specialized running watch. The Forerunner 165 is the more targeted choice when training tools and running GPS are your priority.
When phone-assisted location is enough
The Galaxy Fit 3 has no GPS. It can still suit walking, general movement and simple activity goals when carrying your phone is acceptable. Its low price and long battery are meaningful only if you are comfortable giving up independent route recording.
Training depth: general fitness or running focus?
Garmin vívoactive 6 for broad fitness
The vívoactive 6 combines activity tracking, heart-rate tracking, built-in GPS and 5ATM water resistance in an AMOLED smartwatch that works with Android and iOS. It is the strongest all-around alternative in the cited comparisons because it balances everyday activity and workout functions with multi-day endurance.
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- Designed with a bright AMOLED display, get a more complete picture of your health, thanks to battery life of up to 11 days in smartwatch mode. Fits wrists with a circumference of 125-190 mm
- Body Battery energy monitoring helps you understand when you’re charged up or need to rest, with even more personalized insights based on sleep, naps, stress levels, workouts and more (data presented is intended to be a close estimation of metrics tracked)
- Get a sleep score and personalized sleep coaching for how much sleep you need — and get tips on how to improve it; key metrics such as HRV status help you better understand your health (data presented is intended to be a close estimation of metrics tracked)
- The smart wake alarm gently vibrates to wake you at the right optimal time
- Find new ways to keep your body moving with more than 80 built-in indoor and GPS sports apps, including walking, running, cycling, HIIT, mobility, swimming, golf and more
Forerunner 165 for runners
Tom’s Guide recommends the Forerunner 165 as an SE 3 substitute because of its training tools, GPS and roughly week-long battery life. That makes it the clearest choice for someone whose central question is “How will this help me train for my next run?” rather than “How closely will this mirror an iPhone smartwatch?”
The available comparison does not establish a complete list of its health sensors, smart notifications, payment support or case sizes. Verify those details for the exact edition and region before treating it as a full Apple Watch replacement.
Basic tracking with the Galaxy Fit 3
The Galaxy Fit 3 belongs in a different category. Its cited specification is a low-cost band with long endurance and no onboard GPS, not a direct substitute for a GPS smartwatch. Choose it when steps, simple activity records and minimal charging matter more than independent workouts or a richer smartwatch interface.
Health, sleep and everyday smartwatch features
Health and sleep tracking are central to this buying decision, but the available product summaries do not establish sensor-by-sensor parity among the models. The SE 3’s battery test explicitly includes sleep tracking in Low Power Mode, and the vívoactive 6 is described as having heart-rate tracking. The Forerunner 165 is described through its training and GPS strengths, while the Active 3 Premium and Galaxy Fit 3 summaries focus on price, display, endurance and GPS.
Before buying, identify the specific measurements you need—such as continuous heart rate, sleep stages, workout heart-rate zones or recovery guidance—and confirm that the watch’s current app supports them on your phone. Do not infer identical health results merely because every product is marketed as a fitness tracker.
The same caution applies to notifications and payments. The cited comparisons establish the SE 3’s iPhone positioning, but they do not provide a complete, model-by-model specification for notification handling, payment services or emergency features. If those functions are essential, verify them against the exact regional model and phone operating-system version.
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- Designed with a bright AMOLED display, get a more complete picture of your health, thanks to battery life of up to 11 days in smartwatch mode
- Body Battery energy monitoring helps you understand when you’re charged up or need to rest, with even more personalized insights based on sleep, naps, stress levels, workouts and more (data presented is intended to be a close estimation of metrics tracked)
- Get a sleep score and personalized sleep coaching for how much sleep you need — and get tips on how to improve it; key metrics such as HRV status help you better understand your health (data presented is intended to be a close estimation of metrics tracked)
- The smart wake alarm gently vibrates to wake you at the right optimal time
- Find new ways to keep your body moving with more than 80 built-in indoor and GPS sports apps, including walking, running, cycling, HIIT, mobility, swimming, golf and more
Display, case comfort and charging
Display size and charging figures
Tom’s Guide’s direct comparison lists a 1.32-inch display for the Amazfit Active 3 Premium and 1.57-inch or 1.78-inch display options for the SE 3 comparison, depending on case size. It also reports charging in under two hours for the Amazfit and under one hour for the SE 3 in that comparison. A smaller display can feel less obtrusive, while a larger one can make workout data easier to read; wrist size and eyesight should guide that choice.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsThe cited material identifies the vívoactive 6 as AMOLED but does not provide a case-size range. It does not establish display dimensions for the Forerunner 165 or Galaxy Fit 3 in the figures used here. Try to compare the actual case dimensions and band fit, not just screen diagonal, because comfort determines whether you will wear a tracker overnight.
Water resistance
The SE 3 and vívoactive 6 are both identified with 5ATM water resistance. That rating is not a promise that every water activity or high-pressure exposure is safe; follow the manufacturer’s care instructions for the specific model. The cited summaries do not establish an equivalent rating for the Forerunner 165, Active 3 Premium or Galaxy Fit 3.
Price, subscriptions and ecosystem lock-in
How the starting prices compare
Apple’s current comparison lists the SE 3 GPS from $249 and GPS + Cellular from $299. Tom’s Guide’s cited US comparison places the Amazfit Active 3 Premium at $169, while TechRadar’s table lists the Samsung Galaxy Fit 3 at $59. Prices, promotions and stock can change, and the quoted figures are tied to the cited comparisons rather than a permanent global price list.
The available data does not establish subscription fees for these models. Do not assume that a low purchase price means every analysis feature is free, or that a higher-priced watch includes every service without an account. Check the manufacturer’s current app terms, regional availability and any paid training or health-analysis features.
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Lock-in is more than phone compatibility
An Apple Watch can be the most convenient option for an iPhone user, but that convenience also ties the experience to Apple’s phone ecosystem. Garmin’s iOS and Android support provides more portability. A basic band may cost less, yet changing phones or requiring independent GPS later could force a second purchase. Consider how long you expect to keep the watch, not only today’s sale price.
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- Designed with a bright, colorful AMOLED display, get a more complete picture of your health, thanks to battery life of up to 11 days in smartwatch mode (5 days display always-on)
- Body Battery energy monitoring helps you understand when you’re charged up or need to rest, with even more personalized insights based on sleep, naps, stress levels, workouts and more (data presented is intended to be a close estimation of metrics tracked)
- Get a sleep score and personalized sleep coaching for how much sleep you need — and get tips on how to improve plus key metrics such as HRV status to better understand your health (data presented is intended to be a close estimation of metrics tracked)
- Find new ways to keep your body moving with more than 30 built-in indoor and GPS sports apps, including walking, running, cycling, HIIT, swimming, golf and more
- Wheelchair mode tracks pushes — rather than steps — and includes push and handcycle activities with preloaded workouts for strength, cardio, HIIT, Pilates and yoga, challenges specific to wheelchair users and more (data presented is intended to be a close estimation of metrics tracked)
Choose by scenario
You want the closest Apple Watch experience
Buy the Apple Watch SE 3. It is the explicit iPhone recommendation and the only option here with a clearly stated iOS-only relationship. Accept daily charging and choose between GPS and GPS + Cellular based on whether the cellular configuration is worth the higher starting price and carrier requirements.
You want fewer charging interruptions
Start with the Garmin vívoactive 6, Forerunner 165, Amazfit Active 3 Premium or Galaxy Fit 3. Narrow the list by workout needs: vívoactive 6 for broad fitness, Forerunner 165 for running, Active 3 Premium for the cited price-and-battery balance, and Galaxy Fit 3 for basic tracking without onboard GPS.
You train primarily for running
Choose the Forerunner 165 first. Its recommendation is based specifically on training tools, GPS and roughly week-long endurance. Consider the vívoactive 6 instead if you need a more general-purpose watch and are willing to accept the cited GPS and heart-rate precision caveat.
You need the lowest entry price
The Galaxy Fit 3 has the lowest cited price at $59, but it omits GPS. If independent route recording is important, the Active 3 Premium is the stronger value candidate in the supplied US comparison at $169, with a much longer published endurance claim than the SE 3.
You switch between Android and iPhone
The vívoactive 6 is the clearest fit because Android/iOS compatibility is explicitly listed. Treat the other alternatives as unconfirmed for this particular requirement until you check their current phone support.
A practical buying checklist
- Confirm your phone. Record the exact iPhone or Android version you will use and verify app compatibility for the model and region.
- Decide whether independent GPS is essential. If you run or walk without your phone, remove the Galaxy Fit 3 from consideration because its cited specification has no GPS.
- Set a charging tolerance. Daily charging points toward the SE 3; multi-day endurance points toward the Garmin, Amazfit or Samsung alternatives.
- Match training depth to your goal. Pick the Forerunner 165 for running-focused tools, the vívoactive 6 for general fitness, or the Galaxy Fit 3 for basic activity records.
- Check the exact case and display. The Active 3 Premium and SE 3 comparison show materially different screen sizes; wearability matters for sleep and all-day use.
- Verify health and smart features. Confirm the measurements, notifications, payments and recovery functions you actually need instead of assuming parity across brands.
- Check regional and carrier conditions. Cellular service, app features, prices and stock can vary by country, carrier and edition.
- Review return terms. Comfort, GPS behavior and battery performance are personal; a return window gives you a way to test the fit without treating published maximums as guarantees.
Limitations to keep in mind
The prices and availability cited above can change by region, retailer and date. Cellular eligibility is carrier-dependent. Battery claims come from different sources and test conditions, so they are useful for direction rather than a laboratory ranking. The cited material also does not verify current affiliate arrangements, subscription terms or every health and smart feature for each model.
Use the recommendations as a shortlist, then confirm the exact edition’s compatibility and feature list before purchase. That final check is especially important for the Amazfit Active 3 Premium, Galaxy Fit 3 and Forerunner 165, whose summaries here do not establish complete iPhone integration or full health-feature parity with the SE 3.
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Choose the Apple Watch SE 3 for the most seamless iPhone experience, the Garmin vívoactive 6 for balanced multi-day fitness, the Garmin Forerunner 165 for running, the Amazfit Active 3 Premium for cited price-and-battery value, or the Samsung Galaxy Fit 3 for inexpensive phone-assisted activity tracking.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
