Casio Turns Its Iconic F-91W Into a Sub-$100 Fitness Watch with These New Features

Step tracking, automatic time sync via Bluetooth and a two-year battery will win over a lot of smartwatch detractors.

Close-up of a black Casio digital step tracker watch displaying date, time, and Bluetooth connectivity.

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The F-91W has been quietly running the world for decades, and has remained relatively unchanged since 1989. But now, Casio just gave it something new to do.

Black Casio F-B100W digital watch with Bluetooth, step tracker, and water resistance on a textured background with informational text.
Casio’s $95 steel ABL-100 offered a similar concept a few years ago, but the resin F-B100W brings Bluetooth and step tracking to a significantly lower price.
Casio

In the simplest terms, the F-B100W is, an F-91W with Bluetooth and a step tracker. Casio has employed both of these features before, especially within its G-Shock and Pro Trek lines. We also saw the $95 steel ABL-100 from a couple of years ago, which is a more sophisticated version of this watch. But never before have these features coexisted on such an affordable model. 

Two Casio digital watches side by side, one silver with blue accents and one gold, both showing time 10:58:50 and date SUN 30-6-30.
The F-B100W keeps the F-91W’s original resin case and unpretentious digital silhouette — the Bluetooth upgrade changes nothing aesthetically.
Casio

For F-91W diehards and budget-watch enthusiasts who have spent years ignoring smartwatches on the grounds of daily charging rituals and subscriptions, this is a meaningful alternative that’s easy on the wallet while still giving you a more purist-friendly digital timepiece.

Black Casio digital step tracker watch with blue accents showing time and steps, worn by a runner outdoors.
The F-B100W can track up to 999,999 steps and displays an hourly activity graph directly on its watch face.
Casio

What’s actually new here

If you compare the F-B100W to the steel ABL-100, there’s not much difference in the displays. For this new model, Casio took the resin F-91W and added Bluetooth connectivity that syncs automatically via the smartphone app to adjust the time. 

Black Casio F-B100W digital step tracker watch with Bluetooth displayed alongside two smartphones showing activity tracking apps.
The F-B100W launches in the UK at £55, with US pricing and availability not yet confirmed by Casio.
Casio

This feature would’ve been plenty for most people (and comes standard on lots of G-Shocks already) but step tracking adds an edge for any fitness-minded individuals. An integrated motion sensor keeps things simple and precludes the need for a secondary (and expensive) wearable just to give you that information. The dial displays an hourly activity graph in the top corner. Likewise, the watch gives you the ability to set up daily goals and will even alert you if you’re idle for too long without moving.

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Adding Bluetooth and a step tracker costs you battery life: the F-B100W lasts about two years versus the F-91W’s legendary seven-year run.
Casio

The brand says battery life holds at roughly two years on a single coin cell, which is considerably less than the 7 years promised with the F-91W. Two colorways are available upon launch: black and teal. A third model in black with a reverse LCD might also be on the way soon.

Availability and pricing

The F-B100W is available now in the UK at £55 (~$74). US availability has not been confirmed by Casio at this time.

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