Once Human Wiki & Guide is a community-built online resource for players of Once Human. The site brings together practical information to help users explore the game, develop characters, find equipment, and plan crafting and settlement activities. Its guides cover builds and loadouts, including creator recommendations and a community loadout builder, as well as weapons, armor, mods, and gear-related content.

Players can also consult resources on Deviations and their traits, crafting formulas and recipes, food and drinks, technological benches, and specializations. Exploration tools include maps and location guides for outposts, settlements, facilities, Securement Silos, Monoliths, bosses, and Morphic Crates. Additional sections address cooking, gardening, and animal farming.

The wiki publishes patch notes and promo codes, highlights updates to its content, and offers tools such as a Deviation Hunt Twitch chat game, bot, and extension. Visitors can connect with the community through Discord and social channels or support the site through donations. As a player-maintained guide, it invites users to help improve its information.