"A representative for the product's London-based developer, Flipcode, did not respond to emails on Wednesday."
This is why you regularly check your general inbox. Guaranteed PR opportunity that was missed by the app developer. A single response would have resulted in a quote and a more elaborate mention of the app.
1. Place a call to action on the social icons at top. Something like "Share with friends:" or "Spread the word:"
2. I would make the price a link (in addition to the deal name).
3. The subscription box at the top doesn't really stand out when I first arrive at the site. The goal is to get subscriptions so I'd make it stand out a little more. At the moment I feels blended in.
4. Add a short description each of the deals. 1 to 2 short sentences max. Maybe that could even include any huge restrictions that are on the deal (like can be used on Tuesdays only). It'll also help having the extra content from an SEO stand point.
5. You're sending traffic to sites like Groupon and LivingSocial without monetizing on it. So:
a) Sign up for their affiliate programs.
b) Use your own url to link to their deals. Make the url load a framed version of their deal so that you can still pitch your subscription box at the very top.
c) I'm presuming your goal is eventually to source your own deals to generate revenue.
6. Have a Privacy Policy and Terms of Use. Especially since you're taking signups.
7. When I signup, send me an intro email. Keep it short and to the point.
This is why you regularly check your general inbox. Guaranteed PR opportunity that was missed by the app developer. A single response would have resulted in a quote and a more elaborate mention of the app.