Every option in the catalog for when you need to check whether a piece of text reads as AI-written — 7 AI content detectors and humanizers, 4 of them free or freemium, with the pricing tier printed on every row.
Flocci AI Tools lists 7 of them, ordered free tiers first: Sapling AI Detector, Copyleaks AI Detector, GPTZero, Pangram AI Detector and Originality.ai. 4 of the 7 are free or have a free tier. Each entry states what it uniquely does rather than a score.
1 on this page are marked fully free with no paid plan at all: Sapling AI Detector. The remaining 6 are freemium, trial or paid, and each is labelled with its exact tier so nothing surprises you at sign-up.
Free tools first, then freemium, then trial, then paid, and alphabetically inside each tier. Nobody pays to appear higher: Flocci AI Tools carries no ads, no sponsored slots and no paid listings, so the order reflects price and nothing else.
Sapling AI Detector, Copyleaks AI Detector, GPTZero and Pangram AI Detector all work in a browser tab with no install needed — just open the site and go. 4 of the 4 free AI content detectors and humanizers listed here are browser-based.
| Tool | Pricing | Type | Listed for |
|---|---|---|---|
| Sapling AI Detector | Free | AI Content Detection & Humanizers | Free probability score that text is AI-generated, with sentence-level highlighting |
| Copyleaks AI Detector | Freemium | AI Content Detection & Humanizers | Detects AI-generated text and flags likely AI passages sentence by sentence |
| GPTZero | Freemium | AI Content Detection & Humanizers | Free tier plus dedicated Chrome extension and AI Vision (image/document) detection |
| Pangram AI Detector | Freemium | AI Content Detection & Humanizers | Detects AI-generated and AI-assisted text from ChatGPT, Claude, Gemini, Grok, Llama and DeepSeek |
| Originality.ai | Trial | AI Content Detection & Humanizers | Combined AI detection + plagiarism + fact-checking in one scan |
| Undetectable AI | Trial | AI Content Detection & Humanizers | Bundles an AI humanizer with unlimited AI-detection scanning on every paid plan |
| Winston AI | Trial | AI Content Detection & Humanizers | Image and deepfake detection alongside text AI-detection |