Abstract: WALS, a biorational application strategy for controlling container mosquito larvae in difficult to find or access habitats has been successfully utilized in various mosquito control programs worldwide. An important factor in ensuring effective WALS applications, similarly to adulticide applications is droplet analysis. WALS requires a unique droplet size range in the extremely fine to fine, which can drift though areas such as neighborhood backyards where inaccessible containers may be abundant. To ensure that every application is effective, droplet characterizations are conducted prior to larvicide applications. However, up until now the droplet analysis was performed by a technical development specialist at Valent BioSciences. In hopes of making larvicide droplet analysis more streamlined and accessible for each mosquito control district that wishes to utilize the program, BacDrop will be available to the public and will be user controlled with individual log ins. Based on open-source software, BacDrop analyzes larvicide droplet data in less than 20 minutes.