Fastrack Jupiter S3 Review

Quick Summary

The Fastrack Jupiter S3 is the bigger, squarer sibling of the Jupiter R3, built around a large 1.83-inch screen and a rotary crown. It keeps the same everyday formula: Bluetooth calling, round-the-clock heart rate and SpO2 tracking and a battery rated for up to five days. It still skips AMOLED, GPS and Wi-Fi to hold the price near ₹1,400. For people who find small round dials hard to read, the roomier display is the big draw; those who want a sharper panel or independent workout tracking will want to look higher.

Design & Build Quality

The S3 uses a square polycarbonate case about 46 mm tall and 39.7 mm wide, with a silicone strap, a push button and a functional rotary crown. At roughly 41 g and a little over 10 mm thick, it feels light for its screen size, so it sits comfortably through a workday and overnight.

Plastic is the material that keeps the price down, and it shows: this does not feel as solid as a metal-cased watch. The square shape and crown give it a more recognisable smartwatch look than the round R3. IP68 protection handles sweat, rain and splashes, though it is not a watch to take swimming. Black, Blue and Grey keep the choice simple.

Display & Everyday Use

The 1.83-inch TFT screen is the S3's main selling point. It shows more of each notification, more of a message preview and bigger touch targets than smaller watches do, which makes day-to-day use easier on the eyes. The resolution is 240 × 284 pixels and brightness peaks around 400 nits, which is adequate for indoor use and shaded outdoor glances.

It is still a TFT panel, so contrast and blacks fall behind AMOLED rivals, and bright sunlight will make it harder to read than a brighter panel would. Within its price band the size advantage is real, and the display feels like the S3's strongest area.

Health & Fitness Tracking

The S3 gives you continuous heart rate, SpO2 spot checks, sleep analysis, stress monitoring and step and calorie counts, plus women's health tracking. It lists more than 60 sports modes, fewer than the R3, but still plenty for walking, running, cycling and gym use.

Use the numbers to follow trends rather than to make medical decisions. There is no GPS, so distance for outdoor activities depends on your phone. For someone who wants a daily activity and sleep record on a bigger screen, this covers the essentials.

Calling & Connectivity

Bluetooth calling works with a paired phone, so you can take a call from the wrist without reaching into a bag or pocket. The watch uses Bluetooth 5.4 and works with both Android and iOS phones. The bigger screen makes the on-watch call screen easier to use than on smaller watches.

Like the R3, the S3 has no Wi-Fi, no eSIM and no GPS, so it needs your phone close by for most smart features. Music and camera controls are included from the wrist.

Battery Life & Charging

Fastrack rates the S3 for up to five days per charge. A larger screen and regular calling will pull that number down, so a charge every few days is the realistic expectation. Charging uses a pogo-pin cable with a USB Type-C end and takes about 90 minutes from empty.

The official box lists only the cable, so keep a spare USB adapter handy.

Features Assessment

The feature set is practical: an AI voice assistant, camera and music control, alarm, stopwatch and timer, and the rotary crown for scrolling through menus. Storage is only 64 MB, so there is no offline music and no room for extras. The crown is the most useful addition, since scrolling long lists on a TFT touch screen can be fiddly.

Ease of Use

A button and a crown mean you are not forced to tap everything on the screen, which helps with wet hands or while exercising. The menus are simple, so there is little to learn. First-time smartwatch owners and older users should find it easy to pick up.

Value for Money

The lowest current price we found for the Jupiter S3 is ₹1,399, which is a hundred rupees below the R3 and gets you a notably larger screen and a crown. You also get a 12-month warranty from a well-known Indian brand.

The trade-offs are the same: a TFT panel, a plastic case and no GPS. If screen size is your priority, this is the better pick of the two. If you prefer a round watch with more sports modes, the R3 is the alternative.

Who Should Buy It?

Buyers who want a large, easy-to-read screen at a very low price will find the S3 a good fit. It also suits older users and first-time smartwatch owners who benefit from bigger touch targets and a physical crown.

Who Should Consider Alternatives?

Runners and cyclists who want built-in GPS, or anyone who wants a bright AMOLED display, should look at higher-priced models. Those who prefer a round dial or a larger list of sports modes may be happier with the Jupiter R3.