Nice. Seems very similar to other document based collaboration services, perhaps most notably these folks: http://www.collaborate.com/

Quip seems closed, no links to Google Drive or Box that I could see, and no way to share by PDF, but they include private links to hosted document storage. It's like the Asana walled garden[1] in that way, but Quip has a solid focus on documents not tasks.

Some strange UI artifacts on my iPhone 4s iOS7b4, text insertion didn't work; wonder if this is due to a proprietary attributed uitextview?

[1] http://asana.com/product

Curious: what does "/-/" it their robots.txt[1] do?

    User-agent: *
    Disallow: /-/
    Disallow: /account/

1: http://www.quip.com/robots.txt

Informs search engines not to index the http://www.quip.com/-/ directory.

OK, cheers. I assumed it must be some kind of regexp because according to the Web Archive (see my comment below) the entire domain is disallowed.

That's just where we put the ajax paths to keep a cleaner URL space

Interesting. However, it seems to block bots entirely: http://web.archive.org/web/*/http://www.quip.com

We just opened up the file at launch... Maybe caching or latency?