I suggest adding a comma:
Apparently, it worked.

I don't agree about the comma. In speech there is no pause in this sentence after "apparently." It wouldn't be incorrect to put it in, but it is redundant here.

You are right, saying there is no pause. But that's one reading.
I believe you could also pronounce the sentence with a pause (apparently, when you wish to stress something else). Maybe an adequate solution would be to add another variant – with a comma.

I was trying to look for occurrences of "apparently" at the beginning of sentences. Somehow, I don't find such occurrences with a comma after it. Would you say a comma will certainly not be written there?

Absolutely not. I believe the comma should reflect a reasonable pause in speech. Even for the effect you mention, I can't think of any instance where there would be a pause in this particular sentence. However, in this one: "Apparently, and if everyone has been honest with me, there was a hack at the main office and that is how the news or our merger got to the press." Otherwise, I see "apparently" as a run-on adverb: "You think you know everything, but apparently you don't."

Thanks, I believe this is what I meant - but, indeed, this is not the case here.

If you paraphrase it, you'll see that it's basically a that-phrase:

Apparently it worked.
[it's clear that] it worked.
[it's plain to see that] it worked.
[anyone can see that] it worked.

Whereas "unfortunately" for example, stands for more of a but-phrase and takes a comma:

Unfortunately, it didn't work.
[it's unfortunate, but] it didn't work.

Yes, you're right. I believe I confused it with "unfortunately".
Thanks.

No problem. Interesting question :)

I received the following information (which was deleted afterwards).
So, for other readers who might read the above comments and wonder whether a comma is possible, here is the material once again:

@Eldad, both are correct, so if you use a comma it wouldn't absolutely be wrong.

Google: apparently comma
.. you can find a lot of discussion about this.

Briefly, this is the explanation I liked best.

Normal word order: It apparently worked.

Inverted order: Apparently, it worked. OR Apparently it worked.
(The comma is optional.)

In the Tatoeba Corpus we have examples of both.
https://tatoeba.org/eng/sentenc...rom=eng&to=und

Thanks.

I was happy to receive the above explanation and realize that my comment above had a solid basis. ☺

I'm sorry, but again I disagree. I consider "apparently" set off by a comma a response to a previous statement, followed by an elaboration or explanation. At least that's how we treated it when I was an editor for Penguin from 1998 to 2011:

A: I think Paul finally bought a car.
B: Apparently, there's a parking space with his name on it.

Here speaker B is referring to "I think Paul finally bought a car" with his use of "apparently." This is different from:

A: I think Paul finally bought a car.
B: What makes you say that?
A: Apparently there's a parking space with his name on it.