I’ve built a dozen apps over the past 10 years, most of them commercial, and I always encounter this dip that you describe as I approach the finish line. A number of commenters are suggesting it’s the fear of what comes next that is causing it, but I don’t agree.

For me, it’s so regular that I can see it creep up on me — all the major features completed, only the polishing and websites to complete, and it starts to hit me, trying to drag me down.

Steven Pressfield wrote a short book called The War of Art that talks about this. It’s common to any creative endeavour, whether you’re writing a novel or building a product. I’ve written a novel as well, and it hit me at the same time and in the same way — near the finish.

You need to power on through and come out the other end. All the problems and issues others have talked about will be there waiting, bit that’s a different can of worms.