Slidepad is a Mac productivity app and lightweight browser that brings the iPad slide-over idea to macOS: hover the left or right screen edge and a panel slides in with your websites and web apps, then slips away without rearranging your windows. Every app window stays active, and there is no limit on how many apps you can add.
The StackSocial deal is a single tier: $8.99 once for lifetime access on 1 Mac, against a suggested price of $12.99. The deal page lists version 1.0.43 and states updates are included, and the plan is only available to new users, with the code to be redeemed within 30 days of purchase. The vendor sells Slidepad direct with monthly and lifetime options covering three Mac seats, which is a different seat count from this one-device deal, so no yearly regular price is stated here.
StackSocial shows 85 verified-purchaser reviews averaging 4.8 out of 5, with buyers praising instant licence delivery, easy activation, and daily use on their MacBook. The deal page also cites #1 Product of the Day on Product Hunt, 4.5 out of 5 on Setapp, and 5.0 out of 5 on MacUpdate. Unredeemed codes can be returned for store credit within 30 days; once redeemed, the sale is final.