Dragonflies (Odonata) and butterflies (Lepidoptera) play very important roles in the ecosystem and there are a great many of them. It is estimated that there are more than 5,000 types of dragonflies and 17,500 types of butterflies in the world, among them around 800-1,000 types of dragonflies and 2,200-3,000 types of butterflies can be found in Indonesia. A series of observations conducted in July 2018 at the Cibodas Botanical Garden in West Java found 8 species of dragonflies and 33 species of butterflies. The aim of this research is to develop an Android-based mobile guidebook application for dragonfly and butterfly observation that can be used at any time to easily identify dragonflies and butterflies. This research is a development research that refers to the 4D development model. In the Define stage, activities were carried out to collect initial information related to the diversity of dragonflies and butterflies. In the Design stage, activities were carried out to design books and Android applications. In the Develop stage, validation activities were carried out by dragonfly and butterfly experts, as well as media experts using questionnaires, interviews and discussions (FGD). In the Disseminate stage, activities were carried out to test an android application on students of the Biology Education Department at FKIP UHAMKA. The data obtained were analyzed using quantitative and qualitative descriptive techniques. The test results show that the guidebook was assessed as very good on the presentation aspect, very good for the material and good for the language, with a score of 88%, 85% and 82%, respectively. Thus, this mobile guidebook application, called ODOLEPI, is feasible for use in the observation of dragonflies and butterflies.