Surprisingly low or surprisingly high? If you think that's low, consider that 7% weekly growth is roughly 3300% annual growth, something that most companies would kill for. If that can be sustained for 3 years, the company will be roughly 25,000 times larger than when it started.
Yeah, we're pretty damn tickled with the growth (and stickiness-- abandonment seems unusually low for web software, from what I've read).
FWIW, the 7% week/week was well before any of the press coverage around YC demo day (and associated splash). We've been 12-14% for the last two weeks. I expect it to settle back to the standard word of mouth level of 7%. Of course, I think we have some clever SEO/viral things in the pipeline, which might pick things up a bit.
With respect, it's a compelling app but it's easy to give something away. The real question is how to wrap a revenue model around your offering. If you base advertising on my on-line behavior it may be viewed as too invasive. Another key attraction is that it doesn't interrupt me when I am in flow, so you are probably limited to presenting ads during the analytics so that I am not interrupted when I am actually working. You've done a good job of addressing privacy concerns so far, but a local app would be even more secure: why not offer a version that competes with http://www.timesprite.com/ the attraction for me is that their revenue model is clear and I can rely on them being around for a while. And I would be glad to pay $40/yr for rescuetime as is if I knew that would allow you to persist in your current privacy model. Your situation is unstable until you get to at least cash flow positive. It's a great app, but I would worry a lot more about adding some kind of paying customers instead of more free users.
