Casio F-B100W-1A

__fst__ 329 points 265 comments August 19, 2026
www.casio.com · View on Hacker News

Discussion Highlights (20 comments)

d_silin

Neat. Note that battery life is reasonably good (2 years) even with Bluetooth sync feature.

cgyvbunji

Not the first new F91W-ish model in 40 years but still neat, I hadn't heard about this one yet, thanks for sharing.

huntercaron

Step counter seems like a bizarre thing to focus in on? are people passionately tracking steps without their phones?

kylemaxwell

I have two of these (wearing one right now!!) and several other cheap Casio watches. Some of my favorite purchases ever. I'm so in.

Markoff

shame it doesn't have notifications, otherwise it would be perfect so I guess I'm staying on my third Amazfit Bip since Pebble Time 2 has insane price

bradleyg_

Does it fix the terrible backlight on the F-91W though..

doe88

> Power supply and battery life > Approx. battery life: 2 years on CR2016 Not bad!

jorvi

One thing I've never understood (and hopefully some Casio geek can shine a light on): why do almost all old Casio models have a 24/12h time switch taking the premium spot as one of the main 4 buttons, instead of having it buried deep in the (awkward) menus. Seems to me that something like alarm or stopwatch setting or a second menu action button would have been far more useful.

Someone1234

Here is a fun fact; the US believes owning and wearing an F-91W is evidence that you're a terrorist so much so that they can place you in Guantanamo Bay without trial[0]: > In a handful of cases the detainee's possession of a Casio watch or the wearing olive-drab clothing is cited as evidence that the detainee is an enemy combatant. No basis is given to explain why such evidence makes the detainee an enemy combatant. This is also noted on the F-91W's Wikipedia page: https://en.wikipedia.org/wiki/Casio_F-91W#Usage_in_terrorism [0] https://en.wikipedia.org/wiki/Seton_Hall_reports#Detainees'_...

naniel

i don't want my casio to be smart. been rocking my mq-24 for a decade doesn't mean others can't want a smart casio, but, it's not for me :D

suncemoje

Nice move! I wish it would support even more activity / health features in the future like GPS tracking, sleep tracking, etc. As a full package in the classic design it would make a great alternative to Garmin / Polar / Whoop / Oura etc.

ncruces

Right when I started building a custom F-91W with/for my kids based on sensor watch: https://github.com/joeycastillo/second-movement I'll take some solace in mine supporting lots more alarms (beep when school recess ends) and a bunch of geeky stuff like sunrise, moon phases, tides, and stuff.

kazinator

If you want a Casio watch and are traveling to Japan, just get one at a second hand shop there (WonderEx, Second Street, ...). They are tend to be well stocked on the Casio cruft. I have a Casio PHYS STR-800, nonworking. I got it two decades ago because of the large lap memory (and unusual look, too); I was doing a lot of running, including track training and such. It short circuited one day. Put in a battery, and it drained the thing in a minute. Put in another one, same thing. It's been sitting in the top shelf of a bathroom cabinet since like 2011.

dingaling

Like their G-Shock watches, the actual area dedicated to showing the time is overwhelmed by superfluous elements. Must be barely 20% of the top surface that actually performs its primary function. When I look at my watch I want to see the time, not wasted space announcing "Casio Step Tracker" or "Water Resist" ( which isn't even proper English). I moved to Timex a few years ago as their basic digital watches have nice big numerals for the time display.

eloeffler

It seems to me that it's a slightly more affordable repackaging of the ABL-100WE. The features are the same, so is battery life. That said, I really like this because the ABL-100WE comes with metal bands and I'd really like another watch with a rubber band :) https://www.casio.com/de/watches/casio/vintage/product.ABL-1...

BugsJustFindMe

How does it do step tracking with a 2 year battery life? A purely mechanical step tracker?

johnnyApplePRNG

Why the hell is there bluetooth in it?!

sparkling

It's also a bump up in overall size. The OG F-91W wears very tiny on a larger wrist. F-91W (old): 38.2 × 35.2 × 8.5 mm F-B100W-1A (new): 41.9 × 38.1 × 8.8 mm

__fst__

For anyone interested in modding the F-91W there's also The Ollee Watch, a replacement PCB which adds even more "smart" features. https://www.olleewatch.com/

taviso

I have one of these, there is an open source project called gshock_api that supports it. I think that makes it a much more interesting device. I don't use the app, I tag alarms in remind, and sync them from cron - works great. https://github.com/izivkov/gshock_api The full lifelog (what Casio calls the steps and other metrics) is an opaque binary blob, but we mostly understand it now, so you can access that too. https://github.com/izivkov/gshock_api/pull/3

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