One of our inspirations for modeling text operations in this way was atjson, a rich text format which stores formatting spans alongside a plain text sequence.

However, comments behave very differently from colored text — although a single character can’t be both red and blue, multiple comments can be associated with a single character in the text. We can render this in the editor by showing the two highlight regions overlapping:

Bob’s coloring on the word “jumped” could have been preserved without issue. Another option might be to blend the two colors together on the word “fox”, but then we would be creating a new color that was used by neither Alice nor Bob, and that doesn’t seem right either. In our opinion, the most reasonable behavior is: in the region where the two formatting ranges overlap, we arbitrarily choose either Alice’s color or Bob’s color.

The same way Roblox allows its users to build their own games and play more than 40 million games made by other players, Airtable can allow its users to build their own SaaS software. Last year, Airtable introduced apps that make the product extensible and opened up their API for external apps.

The RECALL Augmenting Memory architecture. It can, for example, help users restore context before their next conference or class. The student, walking to a lecture, could be primed with a summary of it through his smart glasses, surfacing relevant information. The description of the "Memory vault" in this architecture exhibits a high similarity to Vannevar Bush's Memex.