I was unclear on the differences between the Casio F91W and A158. I bought one of each to compare in a hands-on review. Click to check it out.

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Okay, I am now fully involved in the Casio bubble, as I now own two Casio models.

The main reason for this is that I am really anticipating the upcoming Ollee watch shipment and thought that the A158 looks better. The main difference between the two models is the material. That’s all. Even the backlight is still shitty.

Beside that, if you don’t like the kind of cheap look of the F91W (well, it looks cheap because it is cheap), the A158 definitely scratches that itch.

2 Interesting straphabit.com March 13, 2026

Ollee Watch is a smartwatch modification for classic digital watches, primarily the Casio F91W and A158W. We aim to provide a low maintenance smartwatch experience, minimize the noise of the modern world with a simple, functional and highly customizable watch platform.

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A few days ago, YouTube showed me a video about the Casio F-91W, and five minutes later, the algorithm put me straight into the Casio bubble. And now I'm wearing that very watch. Yes, I know, I'm a victim.

What I didn't know was that it was a sign when I stumbled across Ollee Watch, a project that connects this very Casio watch to Bluetooth and makes it a little smarter. This sounded so needy and cool, it probably took me exactly 10 seconds to press the buy button.

What can I say, I'm now counting down the days.

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