As an effective paradigm to aggregate a crowd's wisdom for new product development, crowdsourcing has attracted much attention in recent years. This paper investigates the issue of joint online reviews on crowdsourcing in a dual-channel supply chain with one manufacturer and one retailer. The manufacturer makes customized products of two types: crowdsourcing products (CPs) and noncrowdsourcing products (NCPs), designed by crowdsourcees and the interfirm employees, respectively. We formulate a utility model composed of a pool of consumers who make utility maximizing choices. Utilizing this model, a supply chain framework related to ex ante joint online reviews is developed under the decentralized and centralized setting, to find the joint online review conditions under which the crowdsourcing solutions are accepted prior to putting into production, then derive the CP's and NCP's optimal demand and price and review level. Furthermore, comparison study is conducted concerning the three scenarios: without any online reviews, with only online reviews from consumers, and with joint online reviews from manufacturer and consumers, to examine the impacts of crowdsourcing, online reviews, and both interactions on supply chain performance. The results show, although public opinion suggests that increase in crowdsourcing customized degree facilitates widespread adoption of crowdsourcing design, we find some conditions impede firms from implementing it. Meanwhile, among different combinations of online reviews and decision-making settings, only in joint online reviews and centralized setting, the objective of selecting crowdsourcing design is aligned to maximizing the total supply chain's profit. Additionally, when the customized degree ratio is at a medium level, even if the CP demand is less than NCP, the manufacturer and the retailer gain more payoffs from CPs than from NCPs.