/r/programming doesn't get that specific into programming. I think it's mostly an aggregator of resources for beginners learning how to program. (a large percentage of the posts are questions like 'which language')

I think its possible that your product could have gone over many peoples heads, at least in that particular sub.

Have you looked into subreddits like r/webdevelopment or r/html5( or javascript,CSS)? They have less readers but maybe they're more your target?