# Casio F-B100W

40 Hacker News commenters recommended Casio F-B100W and 26 criticized it, November 2025 to November 2026. It was recommended in 1 of 13 months.

**Verdict:** Fans praise its simple classic design, long two-year battery life and reliable time, though it lacks notifications and a usable app.

## Why people recommend it

- Long battery life, about two years (8 comments): "has a long battery life. Unfortunately, their app is horrible, only works after signing up for an account" ([source](https://news.ycombinator.com/item?id=49366146)) "a bluetooth watch with two years of battery life doesn't sound like a bad idea really" ([source](https://news.ycombinator.com/item?id=49371355)) "battery life is reasonably good (2 years) even with Bluetooth sync feature" ([source](https://news.ycombinator.com/item?id=49362960))
- Simple classic design (4 comments): "I do appreciate the way they implemented them, with a focus on longevity and simplicity" ([source](https://news.ycombinator.com/item?id=49364676)) "As a full package in the classic design it would make a great alternative" ([source](https://news.ycombinator.com/item?id=49363612)) "charming retro tech with modern features" ([source](https://news.ycombinator.com/item?id=49363691))
- Accurate time and useful features (2 comments): "find my phone is helpful, the watch always has the correct time" ([source](https://news.ycombinator.com/item?id=49363957)) "you don't have to manually convert from 24h to 12h time" ([source](https://news.ycombinator.com/item?id=49367877))
- Charming retro tech with modern features (4 comments): "It adds to the charm, to be realized in a few decades." ([source](https://news.ycombinator.com/item?id=49363519)) "I think that makes it a much more interesting device." ([source](https://news.ycombinator.com/item?id=49363741)) "charming retro tech with modern features" ([source](https://news.ycombinator.com/item?id=49363691))

## What people warn about

- Cluttered face with too much text (3 comments): "I love the simplicity but I don't like all the text outside the watch itself" ([source](https://news.ycombinator.com/item?id=49364577)) "I love the anesthetics of a Casio but hate how the face has so much text." ([source](https://news.ycombinator.com/item?id=49367654)) "the actual area dedicated to showing the time is overwhelmed by superfluous elements" ([source](https://news.ycombinator.com/item?id=49363639))
- Requires proprietary app and account (3 comments): "has a long battery life. Unfortunately, their app is horrible, only works after signing up for an account" ([source](https://news.ycombinator.com/item?id=49366146)) "It's blatantly illegal - overprocessing of PII - to require registration for connecting two devices owned by the same person" ([source](https://news.ycombinator.com/item?id=49372331)) "You cannot connect the watch to Bluetooth without a proprietary app" ([source](https://news.ycombinator.com/item?id=49368278))
- No notifications or vibration alarm (2 comments): "if it had vibration alarm and notification, which it doesn't unfortunately" ([source](https://news.ycombinator.com/item?id=49372480)) "shame it doesn't have notifications, otherwise it would be perfect" ([source](https://news.ycombinator.com/item?id=49363488))
- Battery life disappointing for some (2 comments): "mine only lasts a week or so now" ([source](https://news.ycombinator.com/item?id=49372677)) "the stated 2yr battery life is kind of meh in comparison to the F-91W" ([source](https://news.ycombinator.com/item?id=49369743))

## Alternatives hackers recommend

- [Casio watch](https://hackerapproved.com/p/casio-watch.md): 49 recommend
- [Casio F-91W](https://hackerapproved.com/p/casio-f-91w.md): 47 recommend
- [Casio G-Shock](https://hackerapproved.com/p/casio-g-shock.md): 43 recommend
- [Casio Wave Ceptor](https://hackerapproved.com/p/casio-wave-ceptor.md): 5 recommend
- [Casio F-105W](https://hackerapproved.com/p/casio-f-105w.md): 5 recommend

## Where to get it

- [See price on Amazon](https://www.amazon.com/s?k=Casio+F-B100W+digital+watch&tag=hackerapprove-20) (affiliate link)

## Cite as

Hacker Approved, "Casio F-B100W", https://hackerapproved.com/p/casio-f-b100w/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).