Make AI text read
naturally for Sapling.
Sapling is the AI detector we are most transparent about, because it is the same detector we use to score our own output. It returns a probability that text is AI-generated and is used in both writing-assistant and enterprise contexts. Here's how its scoring actually works, what its false-positive record looks like, and the honest version of what a humanizer can and can't do about it.
How Sapling works
Sapling runs text through a machine-learning classifier and returns a probability that the passage is AI-generated, often highlighting the sentences it finds most suspect. Like other detectors it responds to statistical signals such as perplexity, how predictable each word is to a language model, and the variation in sentence structure across a passage. Smooth, predictable output from ChatGPT, Claude, or Gemini tends to raise the AI probability, while uneven, less predictable human writing tends to lower it.
False positives
Sapling's score is probabilistic, so false positives happen on genuinely human text, particularly writing that is clean, formulaic, or short. Non-native English and ESL writing is especially prone to being flagged, since its lower perplexity can resemble AI output. Treat any single Sapling score — including the one we show you — as a signal, not a verdict.
What a rewrite actually looks like
Here's the same paragraph before and after Humanizer — the structure, rhythm, and word choice change, not just a few swapped synonyms. The percentage is Sapling's AI-likelihood estimate, shown on every rewrite. It's a signal, not a guarantee against Sapling.
AI has become an integral part of modern content creation. With the advent of large language models, the ability to generate high-quality text has been revolutionized, allowing for unprecedented efficiency in writing workflows.
Recent advances in large language models have genuinely reshaped how people write. What used to take days of drafting can now happen in an afternoon — though how much it helps still depends on the field, and we're all figuring out the limits.
Humanize your text.
Right here, right now.
Paste up to 1,500 characters, pick a mode, and get a real rewrite with an AI-detector score. No account, no card.
Your rewrite will appear here.
Free tool runs Claude Haiku, one pass. Pro (app & web) uses the stronger model with a detector-guided retry loop, longer text, and unlimited rewrites.
Humanize free — then get the app
Try the rewriter right here, no signup. Get the native Mac & iPhone app for unlimited rewrites, longer text, and the stronger model.