FocusOKR might be a bit more popular than Markdown Here. We know about 1 link to it since March 2021 and only 1 link to Markdown Here. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
If I got your point correctly, I think markdown is a great solution for this. For this particular app, I used react-markdown as parser but there are other libraries of course. Source: about 3 years ago
Here are two examples that pretty much sums it up (for me): https://okrs.app/ and https://focusokr.com/. Source: over 1 year ago
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UseFocus.co - Focus helps your team stay in sync without meetings and work better together. A Simple, Light, Effective macromanagement tool.