Like the title, but was disappointed.<p>Coming up with a spec format that clients will like has always been a fairly easy problem to solve - as well the spec is usually worked on once the project has been awarded, so isn't even part of the sales process. As well it's hard to improve the writing + sharing experience of Word + Email or Google Docs + Sharing.<p>The attention to estimating is nice, and will save freelancers or less experienced teams time, but is only really useful to teams that do contract and custom work.<p>I was hoping for more of a focus on the collaborative work that comes out of writing specs: more around the commenting/editing/workflow. When working on a spec (either internal or external) change requests or modifications are important, as are interdependencies and change tracking.<p>Your product title made me think "GitHub for Specs" and it doesn't seam you're going that way. Shame.