Human-centered language
The plain language standard for AI.
Anyone who writes about people: associations, local government, health systems, businesses and nonprofits.
Free and open source
Teach your AI how you write.
Three free skills for the AI you already use. They take out the habits that make writing sound machine-made, and help it write about people clearly and respectfully.
Which AI do you use?
Pick yours and we’ll walk you through it. It takes about two minutes, and you don’t need to be technical.
The three skills
Start with one. Most teams use human voice plus one of the two standards.
Trauma-informed language
For organizations whose readers may have lived through trauma.
Shelters, domestic violence programs, foster care, health care and anyone else whose readers may have lived through trauma. It includes everything in human-centered language.
Human voice
Takes out the habits that make writing sound machine-made.
Anyone whose readers have started to hear the AI in their writing.
What changes
The same request, with and without the human-centered skill.
Without the skill
We placed Maria in a job after she completed our program.
With the skill
Maria found a job after finishing the training.
Tested every month
Every month, the Human-Centered Language Benchmark runs the skills on 16 AI models, from Anthropic, OpenAI, Google, xAI and Meta to open-weight models like DeepSeek, GLM, Kimi, Nemotron and Gemma. We publish the results, methods and raw outputs.
See the BenchmarkOpen source
Every skill is free under CC BY 4.0. Read the files, adapt them, and tell us what’s missing. Developers can work straight from the repositories.
View on GitHub