Smart switches for an old apartment

[rigid marsh]

Recently bought a bunch of smart light bulbs for my apartment. They work great and the automations have improved my life significantly.
But if anyone visits my place, it's super inconvenient for them, as the only way to control the bulbs is from my phone.
I'm looking for some cheap smart switches so that anyone can turn on or off my light switches without my phone.
I tried looking on AliExpress, but a lot of em seem to use ZigBee or Z-Wave, I only have WiFi. Also a lot of em seem to require a neutral wire, which I do not have in my apartments wiring. I have the Finnish rS3 qualification to do electrical installations, but it's quite a limited one so I'm allowed to replace light switches, but I cannot install neutral wires without the presence of a person with a higher qualification.
Also the light switches seem to require a capacitor to be installed, which isn't a problem, just wondered if all smart switches require that if no neutral is present.

If anyone knows any good, cheap switches that use WiFi, I'd be interested in hearing your recommendations.

Thanks.

Oh and forgot to mention that we use 230V AC around here.

[worthy cosmos]

using smart switches in combination with smart bulbs is sometimes an issue. smart switches are generally designed to control "dumb" bulbs and will generally turn the power to the bulb on/off when the switch is toggled. Some switch models (I'm not familiar with your market) support a "smart bulb" mode that disconnects the switch from the power control, so the switch only sends events to HA, then HA controls the bulbs directly.

thirdreality has this product for the north american market: https://www.amazon.com/dp/B0CRKNXQF2 which gives you the ability to add a smart button control without rewiring/removing the existing switch.

You should consider zigbee - it'll significantly expand your search because zigbee is low power, so it enables battery powered devices to be used instead of hardwired. Adding zigbee support to HA is pretty straightfowards, and not expensive.

Regarding neutral vs no-neutral smart switches - the reason the capacitor might need to be added with no neutral is that the switch is designed to remove power from the bulbs, but it needs power itself to stay online. Without a neutral, removing power from the bulbs breaks the circuit, so the switch doesn't have any way to power itself. The usual solution is to essentially "dim" the bulbs to be almost completely off but still let just enough power through to keep the switch powered. With modern low power LED bulbs, this can sometimes cause the bulbs to flicker on/off, and adding the extra capacitor can smooth things out and prevent the LEDs from trying to turn on.

[rigid marsh]

Seems to be difficult to find ones that are installed in the wall and use batteries. I'd prefer replacing the whole thing instead of just adding an extra switch