offenbar
apparently
Expresses an assumption based on clear signs; apparently, seemingly.
Das Licht ist an, also ist offenbar jemand zu Hause.
The light is on, so apparently someone is at home.

apparently / obvious
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apparently
Expresses an assumption based on clear signs; apparently, seemingly.
Das Licht ist an, also ist offenbar jemand zu Hause.
The light is on, so apparently someone is at home.

The word is composed of 'offen' (open) and the suffix '-bar' (-able). It literally means that something lies 'open' and is therefore visible or recognizable to everyone.
Die Lösung des Problems war nach langem Nachdenken plötzlich offenbar.
After long reflection, the solution to the problem suddenly became obvious.
The most common use is as an adverb that expresses an assumption. In this case, 'offenbar' is not declined. You can recognize the rarer adjectival use by the fact that the word is declined before a noun.
Er ist offenbar nicht mit dem Ergebnis zufrieden.
He is apparently not satisfied with the result.
As an adverb, 'offenbar' can stand in position 1, which moves the verb into second position. But it can also stand in the middle of the sentence, usually after the conjugated verb.
Offenbar hat er den Zug verpasst.
Apparently he missed the train.
The use as a declined adjective before a noun is rare and belongs more to written language or a formal style. This form is hardly used in everyday speech.
Trotz seines offenbaren Desinteresses musste er bleiben.
Despite his obvious lack of interest, he had to stay.
probably / well
'wohl' and 'offenbar' can both express an assumption. The difference lies in what the assumption is based on. 'wohl' generally says that something is probable. 'offenbar' is used more when there are clear signs and you draw a conclusion from them. Learners may confuse the words because both express less than 100% certainty. If you are only making a cautious guess, 'wohl' fits. If something can be clearly recognized from a situation, 'offenbar' fits better.

Die Lehrerin ist offenbar krank, denn der Unterricht fällt heute aus.
The teacher is apparently sick, because class is canceled today.
Nach dem Essen ist meine Mutter wohl zu müde für das Training.
After the meal, my mother is probably too tired for training.