This app was mentioned in 5 comments, with an average of 2.20 upvotes
You can find a "dagens ord" in the app Svensk ordbok (iOS / Android) by the Swedish Academy.
As been said, there is also a "dagens ord" at www.saob.se, but I'm not sure I'd recommend it if you're a learner. SAOB goes beyond "unusual or uncommon", it's filled with archaic words that are obsolete in modern Swedish.
https://play.google.com/store/apps/details?id=se.svenskaakademien.so16
If the app is not region locked. (official Swedish dictionary)
Also accessible from https://svenska.se/
If access able overseas.
There is 3 official dictionaries.
SAOL (Swedish academy wordlist) 126k words SO (Swedish dictionary) 65k words SAOB (Swedish academy dictionary) 500k words (since year 1521)
<strong>Svensk ordbok</strong> <em>av Svenska Akademien</em> is excellent for this. It's not free, but well worth the coin. Available on Android and Iphone:
I use Svensk Ordbok: