I briefly looked at the site whatculture.com but couldn’t find the section called “Available Assignments”. May be it’s only available for logged in users.
Oasis Workflow works within the perimeters of WordPress Admin area. So anyone who wants to edit/review articles needs to login into WordPress to access their inbox and review/sign off their task.
You can try and use the “regular” version and see how it works. See if it fits your needs and then look at the “Pro” version for automation and other features.
The advantage you would get with the “Pro” version are:
1. You can create multiple workflows.
2. You can setup “auto submit” depending on some keywords. So essentially, the articles will get auto submitted into a workflow and all the users will get an assignment in their inbox. Who ever claims it first will be responsible for that article.
3. Lastly, the published article can also go through a workflow review process without taking the published article offline. Almost all the users love this feature, since WordPress doesn’t have a way to update published articles through a review process without taking the article offline.
Lastly, there are a couple of reports which help with the management of articles.
You can see a complete list of features and how they work on the website – https://www.oasisworkflow.com/pricing-purchase
Hope this helps.