See which paragraphs read like a model wrote them.

Every paragraph gets marked human-ish, machine-ish or mixed, with the odds. When the evidence is thin, the meter says it can't tell, and it says that a lot, on purpose. The model is 56 KB and runs in your browser, so nothing you paste gets uploaded.

Add to ChromeSee how often it's right
0255075100HumanMachine% machine-shaped

Reading

Standard

56 KB · 176 numbers

2550750HumanMachine100

Waiting for text

Input

A model wrote it

A person wrote it

Both

Yours

Model

openai/gpt-5.6-luna, generated 2026-09-20, prompt: "Write a product description for a stainless steel water bottle."

Stay refreshed wherever the day takes you with this sleek stainless steel water bottle. Built for everyday use, it offers a durable, reusable alternative to disposable plastic bottles while keeping your drink within easy reach. Its smooth, stylish design fits comfortably into backpacks, gym bags, and cup holders, making it ideal for work, workouts, travel, and outdoor adventures.

**Features:** - Durable stainless steel construction - Reusable and easy to clean - Sleek, lightweight design - Secure screw-top lid - Suitable for water, juice, tea, and other beverages

Hydrate in style and make a more sustainable choice with a bottle designed for life on the go.

Engine

Test WebGPU on this device

The sheet above scores each paragraph on the CPU, in well under a millisecond. WebGPU takes over for big batches, like a long page in the extension. This test runs both here and checks that they agree.

CPU
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256 paragraphs, one at a time
WebGPU
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the same paragraphs in one batch