Here in Spain we have a saying to mark that something works perfectly, we say that it works like a Swiss watch. Is there any equivalent expression in English?
I like the expression to work like a charm:
If something works like a charm, it is very successful or effective.
Although the expression is general enough that it can be used in a lot of different situations, I probably would not use it to describe how well electronic or mechanical devices work. You can use it to talk about software, however. For example:
That antivirus package that you recommended really fixed my computer. It helped me get rid of all the malware and adware that I had on it. The thing really worked like a charm.
Yes, in English, you can say: x runs as smoothly as a Swiss watch.
This can be checked by googling to see sites where the expression occurs.
There are, of course, many other expressions in English for this meaning.
In English, there are many ways to express that something works perfectly fine, here are some (these pertain to situations when something happens without any problems at all):
to go like clockwork [verb phrase] - if something you have arranged such as an event or journey goes like clockwork, it happens in exactly the way that was planned, with no problems at all
- After all that fuss, everything went like clockwork. You should have seen it.
- ‘Everything go all right?’ ‘Like clockwork.’
- All through that summer, work on the farm went like clockwork.
to go smoothly [verb phrase] - if a planned event, journey, piece of work etc goes smoothly, there are no problems to spoil it
- If all goes smoothly, elections are expected in May.
- In rehearsal, everything went smoothly, even the difficult fight scenes.
- My presentation went remarkably smoothly, until one student asked an awkward question right at the end.
without a hitch [adverb] - if a planned action or event happens without a hitch, it happens exactly as planned with no problems at all, even though some may have been expected
- The first phase of the operation was completed without a hitch.
to go according to plan [verb phrase] - if something that has been carefully planned goes according to plan, it happens in exactly the way you planned it would
- Development of our new computer system is going according to plan and it should be in operation by October.
But, of course, you can put it in another way by using the following adverbial phrases. Be careful, they can only be used in a specific context:
like a dream
with no trouble