Wouldn't a watch do that? Ex. the https://pine64.com/product/pinetime-smartwatch-sealed/ is dirt cheap and its alarms just vibrate the watch.

I would prefer something less bulky (I don’t wear a watch) but thank you for the link: that is indeed dirt cheap and probably worth a go.

I guess it depends. My partner still gets woken up by my (smart)watch at the lowest vibration setting.

If your partner gets woken by a watch vibration actuator, I doubt it's possible for you to sneak out of bed without waking them, as your body weighs about 10,000 times as much as that actuator.

I used the smallest fitbit for that. Work very well for me.

it does not.

If it doesn’t vibrate that’s a real shame. Ideally I would want it to vibrate as well as be able to detect gestures. That would be such a killer combo for so many things from golf training to turning on the mood lighting with a swish of your hand.

Well, they missed a huge opportunity to break into the discrete sex toy market, then.

For small diameter inserts..