Staying on the French side, if I bring a voltage converter is it going to fry my laptop or iPhone as well as a couple of personal devices that get recharged using a USB plug?

Check your AC-DC converter for the USB plug; chances are very high that it supports 110-220VAC and 50/60Hz. If so, you don't need a voltage converter at all, just a plug adapter from US spade to round European. I haven't seen a notebook power supply in many years that doesn't support both currents and frequencies.

What Zanshin said. When I had a place on the French side many years ago I needed a heavy, bulky transformer. Now, all that I need is an adapter plug for anything that has 100-240 vac 50-60hz on the input side of the power supply. Some devices with motors, such as hairdryers, may not run at the correct speed and may overheat. Other hair devices such as curling irons and straighteners may be a problem too, but notebooks, tablets, and phones should be OK.

Search Amazon using the phrase “ power adapter for france “ and you’ll find many adapters to choose from.