GPTinf

The core tool rewrites AI text so it reads more like a person wrote it. You can lock important terms with a Freeze option, pick from eight writing modes, and re-humanize only the sections that still trip detectors. The engine runs on custom non-AI algorithms, which the team markets as a way to avoid the "AI refining AI" loop.

The detector cross-checks your text against eight detection systems instead of one, shows results for each, and color-codes segments so you can see exactly which sentences look machine-written. It runs free and unlimited with no account. That per-segment view is more useful than a single score when you only need to fix a few weak spots.

This tool compares your text against web sources and returns a plagiarism percentage alongside flagged sentences. Each match traces back to its source URL, so you can verify what actually overlapped rather than guessing. It's a fast first screen, not a replacement for a full academic integrity report.

The paraphraser rewrites your text while trying to hold onto its meaning. You can paste or upload content, lock words you want left untouched, and choose a rewriting mode that matches the task. Unlike the humanizer, this one is meant for restructuring phrasing, not for evading detection.

The readability checker returns a readability score instantly, highlights hard-to-read spots, and lets you adjust for a target audience, which matters when you're writing for readers well below your own reading level. The grammar checker catches contextual errors, not just typos, and you click any error to fix it in place.