iNaturalist is a popular mobile app and website interface that allows users to record and share observations of flora, fauna, and fungi worldwide, helping to identify species and track biodiversity.

BioCollect is a free tool developed by the Atlas of Living Australia to support researchers and citizen scientists in structured data collection for biodiversity surveys and projects.

Biodiversa is a free mobile game app designed for biodiversity monitoring and ecosystem protection, where users collect and identify plants and flowers during outdoor walks

This is a huge platform for various citizen science projects from around the world. Instead of collecting data outside, you contribute by processing it (e.g., classifying galaxy images, transcribing historical documents, or counting animals in camera trap photos).

Merlin Bird ID helps users identify birds by their photos or sounds. It’s a personal birding assistant powered by artificial intelligence to make bird identification easier.

iSpot is an app designed to help users identify anything in nature, from plants to wildlife, while connecting them with a community to share and learn about species.

Focuses on environmental data collection, allowing you to record things like clouds, mosquitoes, and land cover, which contributes to NASA's global environmental research.

A platform, primarily used in the UK, for submitting sightings of all species. It often acts as a backend for smaller, specialist recording schemes (like for butterflies or ladybirds).

giant open database of occurrence records used by researchers worldwide.