Garmin fēnix 8 vs Garmin Instinct 3 Solar
Garmin fēnix 8 (2024, listed at $1099) and Garmin Instinct 3 Solar (2025, listed at $449) are both sport watches, so the choice comes down to specifics.
Specs last updated · prices are list prices
Garmin fēnix 8
Garmin's no-compromise multisport flagship — built-in dive computer, AMOLED, multi-band GPS.
Garmin Instinct 3 Solar
Solar-charged tank — months of battery, MIL-STD-810 toughness, brilliant always-on MIP screen.
The verdict
On the numbers we track, Garmin fēnix 8 wins on tracked features (7 vs 3); Garmin Instinct 3 Solar wins on battery life (24 days vs 16 days), weight (58 g vs 73 g) and price ($449 vs $1099).
Bottom line: on raw specs the Garmin Instinct 3 Solar leads 3 to 1, but five spec categories are only a starting point. Match it to your phone, your main sport and your budget before you decide, or run the free quiz to see how each ranks for your answers.
Spec by spec
| Spec | Garmin fēnix 8 | Garmin Instinct 3 Solar |
|---|---|---|
| Battery (rated) | 16 days | 24 days |
| Weight | 73 g | 58 g |
| List price | $1099 | $449 |
| Water rating | 10ATM | 10ATM |
| Tracked features | 7 | 3 |
| Case size | 47 mm | 45 mm |
| Display | AMOLED | MIP |
| Works with | both iPhone and Android | both iPhone and Android |
| Listed best for | multisport and triathlon, outdoor adventure and running | outdoor adventure and multisport and triathlon |
| Released | 2024 | 2025 |
Trophy marks the better value on the five measurable specs. Battery is the manufacturer's rating, not our test. How we score is on the methodology page.
Feature overlap
Both have (3)
- built-in GPS
- blood-oxygen (SpO₂)
- swim tracking
Only Garmin fēnix 8 (4)
- on-device music
- contactless payments
- AMOLED display
- offline maps
Only Garmin Instinct 3 Solar (0)
Nothing unique.
Which one should you pick?
Pick the Garmin fēnix 8 if…
- You need on-device music, contactless payments, AMOLED display and offline maps, which the Garmin Instinct 3 Solar does not list.
- Your main use is running: it is listed for that and the Garmin Instinct 3 Solar is not.
- You might switch phones: it works with both iPhone and Android, the Garmin Instinct 3 Solar only works with Android.
- You want a bright AMOLED screen.
Skip it if…
- • You have a small wrist (under about 160 mm) — the 47 mm case we list is large (check whether a smaller size is sold).
- • You want something light enough to sleep in — it weighs 73 g.
- • You are watching your budget — the list price is $1099.
Pick the Garmin Instinct 3 Solar if…
- You want to spend less: it lists for $650 less.
- You want fewer charges: about 24 days per charge vs 16 days.
- You want a lighter watch: 58 g vs 73 g.
- You might switch phones: it works with both iPhone and Android, the Garmin fēnix 8 only works with Android.
- You want the newer model (2025 vs 2024).
Skip it if…
- • You want a bright, vivid AMOLED screen — this one uses a lower-power display.
Frequently asked questions
Which has better battery life, the Garmin fēnix 8 or the Garmin Instinct 3 Solar?
The Garmin Instinct 3 Solar has the longer rated battery life: about 24 days per charge against 16 days. These are manufacturer ratings; heavy GPS, always-on display and cellular use will cut both.
Which is cheaper, the Garmin fēnix 8 or the Garmin Instinct 3 Solar?
The Garmin Instinct 3 Solar has the lower list price: $449 against $1099 in our database. List prices change often, so check Amazon for today's price.
Do the Garmin fēnix 8 and Garmin Instinct 3 Solar work with iPhone and Android?
Yes, they have the same phone support: both iPhone and Android.
Which is better for swimming, the Garmin fēnix 8 or the Garmin Instinct 3 Solar?
Neither has an edge on water rating: both are rated 10ATM. 10ATM is suitable for swimming and surface water sports. It is not a dive rating unless the maker says so.
Not sure either is right for you?
Nine questions about your phone, sport, wrist and budget, scored against all of our watches with the reasoning shown.
Take the free quiz