AiSniff

AiSniff is an AI-writing pattern detector that marks phrases in English and Chinese text matching documented patterns.

AiSniff marks phrases in English and Chinese text that match documented AI-writing patterns. Each mark names its rule, cites a public source, and suggests a plain rewrite. The web editor, the CLI, and the agent skill run from one set of JSON rules without any server or model call. Users can paste text into the live demo or use the command line interface to scan files, stdin, or folders. The tool supports inputs in English, Traditional Chinese, Simplified Chinese, Japanese, Korean, Spanish, French, German, and Portuguese, and exports results or saves annotated texts as PNG files.

AiSniff at a glance

Best for: Writer, Marketer
Runs on: Web, CLI, API, GitHub Actions, self-hosted, open source
Pricing: Free and open source under the MIT license.
Released: October 2026
Category: AI writing tool
Website: github.com/arthur031221/aisniff

Key features

Mark phrases matching documented AI-writing patterns
Name rules and cite public sources for each mark
Suggest plain rewrites for flagged phrases
Scan files, folders, or stdin via CLI
Group hits by type in a side panel
Save annotated text as a PNG
List all rules with their confidence levels

Use it for

Scan English and Chinese drafts for AI-writing patterns
Check markdown or text files via command line
Integrate checks into GitHub Actions workflows
Compare before and after hit counts in an editor

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