Free Scribbr AI detector alternative
Get the full AI score with no premium gate. Free, private, and nothing you paste is kept.
Check your textHow to read your AI detector score
The AI detector gives you a single number from 0 to 100. It is the estimated chance that AI wrote the text, not a yes or no. Here is what each band means.
Probably a person
Reads like human writing. We did not pick up the patterns a model tends to leave behind.
Hard to say
Some of it leans one way, some the other. Read it yourself before you draw a conclusion.
Probably AI
This has the marks of machine-written text. Read it closely before you conclude anything.
How this Scribbr alternative works
Three steps, a few seconds, no setup.
Add your text
Paste it, upload a Word or PDF file, or drop in a link to the page you want to check.
We check the patterns
The model weighs your text against the patterns of AI writing and human writing, the same kind of check Scribbr runs.
Read the score
You get a number from 0 to 100 and a plain read on how likely AI was involved.
AI Detector vs Scribbr
Scribbr is well known for academic proofreading, and its free AI detector needs no account. The catch is what the free tier can see: it reliably flags older models like GPT-3.5, while detecting newer writing from GPT-4, Claude and Gemini is part of its paid plans, which are bundled with Scribbr's essay-check service. The free tier also caps each check at 1,200 words. This tool checks against modern models for free, with no word cap and no upgrade.
| At a glance | RoboSnitch | Scribbr |
|---|---|---|
| Price | Free | Free tier; premium in paid plans |
| Newer models (GPT-4+) | Covered free | Premium only |
| Free word limit | No fixed cap | 1,200 words per check |
| Account | None needed | None for the free detector |
| Input | Paste, Word, PDF, or link | Paste and upload |
Good for a pre-submission check
Students mostly want one thing: a read on their own work before a grader sees it. You can paste the text, upload a Word or PDF, or drop in a link, and get a score in seconds. For long papers the checker splits the text into sections and averages the result.
Where your text goes
The check happens in memory on our own server. As soon as you have a score, your text is dropped. No logs, no database, no training set.
There is no account holding a history of your checks either.
Scribbr AI detector FAQ
Is this a free Scribbr alternative?
Yes. You get the full score for free, with no account. It isn't affiliated with Scribbr.
Does Scribbr's free detector catch GPT-4?
Detecting newer models like GPT-4 is part of Scribbr's paid plans. This tool checks against modern models for free.
Can I upload my paper?
Yes. Upload a Word or PDF, paste the text, or drop in a link.
Do you store my writing?
No. It's analyzed in memory and dropped as soon as you get a score.
Which AI models does it catch?
A broad mix, including ChatGPT, Claude, Gemini and Llama.