GPTOne vs AI or Not: Which Image Checker Should You Use?

AI or Not runs on credits across six media types. GPTOne runs on-device with a region heatmap. The honest 2026 comparison.

AI or Not is a credit-based platform covering text, image, deepfake, voice, music and video, with 20 free image checks to start. GPTOne is a focused image checker that runs analysis on-device and returns a region heatmap showing which parts of the image drove the result, on a free account, where the starting credit grant covers one image scan.

Breadth versus explainability. That is the real trade, and which one wins depends entirely on what you are doing.

Key Takeaways

• AI or Not's free tier is more generous on volume: 20 AI image checks plus $5 in credits and 1M words of text detection monthly, per its published pricing.
• AI or Not Pro is $5 per month, including $10 of monthly credits, roughly 500 image checks, 2M words and 1,000 seconds of video.
• GPTOne's free tier is smaller on volume: one image scan costs 1,000 credits, the entire starting grant, so a new free account gets one image scan.
• GPTOne analyses images on-device, so the file never leaves your browser. AI or Not is a cloud platform with an API.
• Neither should be used as sole evidence. Image detection returns a confidence assessment, never a verdict.

Where AI or Not is the better choice

Let's start with the case for the other tool, because it is a real one.

AI or Not covers six media types on one credit balance: text, image, deepfake, voice, music and video. If your work involves verifying audio and video alongside images, that consolidation is genuinely valuable. Running four vendors for four media types is worse than running one.

Its credit model is also flexible. Credits work across all the available models, so you spend them wherever the volume happens to fall that month rather than paying for four separate allowances.

And at $5 per month for Pro, the pricing is not the obstacle. For a moderation workflow processing hundreds of images with occasional video, that is inexpensive.

The API is a real product too, with a key available on the free tier, which matters if you are building detection into a pipeline rather than checking things by hand.

So if you need multi-media coverage or programmatic access, AI or Not answers a question GPTOne does not.

Where GPTOne is the better choice

Three differences matter, and they compound.

The region heatmap. A single confidence percentage tells you very little about a real image. The question that usually matters is not "is this AI" but "which part of this is AI". A genuine photograph with a swapped face, a real property with a generated sky, a real person against a synthetic background: these are the actual cases people bring to a detector, and a document-level score cannot distinguish them.

Our AI image detector returns a confidence assessment plus a pixel-level heatmap marking the regions that drove it. That turns a verdict you have to trust into evidence you can look at. We explained why that matters in detecting AI-modified images and seeing which parts are AI.

On-device analysis. GPTOne processes the image in your browser. It is not uploaded to a server. For anyone checking client photographs, legal exhibits, medical images, HR material or anything with a confidentiality obligation, that is not a nice-to-have. Uploading a sensitive image to a third-party cloud service is itself the problem you were trying to avoid.

Pro features on the free tier. The region heatmap, C2PA provenance reading and private on-device analysis are all available without paying, which is unusual. What you do not get is volume: one image scan costs 1,000 credits, the whole starting grant, so a free account covers a single image. AI or Not's 20 free checks is the more generous free allowance by a wide margin, and it is fair to say so.

The features we do not gate

The thing that distinguishes the GPTOne free tier is what is included rather than what is metered.

The region heatmap is free. C2PA provenance reading is free. On-device private analysis is free. These are the capabilities that competitors most commonly reserve for paid plans, and the reason is that they are the expensive ones to build.

The limit is volume, not capability. One image scan a day, and you get the full analysis, not a stripped-down preview designed to sell you an upgrade.

Worth being precise, because the distinction matters: one image scan consumes the full 1,000-credit starting grant, so a new free account gets exactly one image scan and no text credits left. Paid plans start at $7.99 a month. If you check images in any volume, budget for a paid plan on either service.

On accuracy claims

Here is where we are going to be less satisfying than most comparison posts, deliberately.

We are not going to publish a head-to-head accuracy table against AI or Not, because we have not run a controlled test against their current model, and inventing one would make this article worthless.

What we can point to is our own first-party work. We ran a 60-image benchmark, published on Medium, testing our image detection across generators. It is our own study, not an independent third-party evaluation, and we describe it that way. The methodology and results are in how accurate AI image detectors really are.

We also do not quote a fixed accuracy percentage for image detection, and you should be sceptical of anyone who does. Image detection performance varies enormously by generator, by image resolution, by compression level and by whether the image has been edited after generation. A single headline number across all of that is marketing, not measurement. What you get from us is a confidence score and a heatmap you can inspect.

If accuracy on your specific image type is the deciding factor, test both on a sample of your own images. That is the only comparison that answers your question.

Which to pick

Choose AI or Not if you need video, audio or music detection alongside images, if you need API access, or if you process images in volume and want one credit balance covering everything.

Choose GPTOne if you need to see which regions are AI rather than just a score, if the images are confidential and must not be uploaded, or if you check images occasionally and do not want an account.

Plenty of people should use both. Two independent assessments agreeing is worth far more than one tool's confidence, and disagreement tells you the image is genuinely ambiguous, which is itself useful. Our roundup of the best AI image detection tools covers the wider field.

Checking the specifications yourself

Both products publish enough to verify the comparison above, and credit-based pricing changes often enough that you should.

AI or Not's published pricing lists the current free allowance, the Pro price, and how credits convert across text, image, video and audio. We read it as $5 in starting credits with 20 AI image checks and 1M words of monthly text detection on the free tier, and $5 per month for Pro including $10 of monthly credits. If those numbers have moved, the pricing page is authoritative and this article is not.

The specification neither of us can hand you is a controlled accuracy comparison, and it is worth being explicit about why rather than filling the gap with a table.

Image detection performance is not a single number. It varies by generator, because different architectures leave different artefacts. It varies by resolution, because detection depends on fine texture statistics that downscaling destroys. It varies by compression, because JPEG artefacts overwrite exactly the signals being read. And it varies by whether the image was edited after generation, which is the common real-world case.

A vendor publishing one accuracy percentage across all of that has averaged away the only variables that matter for your specific images. We do not publish such a figure for image detection, and we would treat anyone who does with suspicion.

What we do publish is our own 60-image benchmark, described as what it is: our first-party study, not an independent evaluation.

The comparison that will actually settle this for you takes twenty minutes. Collect twenty images of the type you handle, half synthetic and half genuine, and run both tools. That test answers your question. Ours cannot.

It is also worth checking what each tool does with provenance data, since that is a capability people forget to compare. The C2PA specification defines the signed manifest format that most major generators now attach, and reading it is a separate operation from analysing pixels. A tool that does both in one pass gives you two independent lines of evidence: what the pixels suggest, and what the file claims about its own history. Agreement between them is strong. Disagreement, particularly a file claiming camera capture while the pixels suggest generation, is the most interesting result a checker can give you.

FAQ

Is AI or Not free?

Its free tier includes $5 in credits, 20 AI image checks and 1M words of text detection monthly, per its published pricing.

How much does AI or Not cost?

Pro is $5 per month including $10 of monthly credits, with enterprise pricing available on request.

Does GPTOne upload my image?

No. Analysis runs on-device in your browser, so the image is not sent to a server.

How many free image scans does GPTOne allow?

One image scan costs 1,000 credits, which is the entire starting grant on a free account, so a new free account gets exactly one. Paid plans start at $7.99 a month.

Which is more accurate?

Neither publishes a controlled head-to-head against the other. Image detection accuracy varies by generator, resolution and compression, so test both on your own image type.

The short version

AI or Not is the broader platform. GPTOne is the more explainable image check, and it keeps your files on your machine.

Try a scan at GPTOne and see the heatmap for yourself.

Meta description: AI or Not runs on credits across six media types. GPTOne runs on-device with a region heatmap. The honest 2026 comparison.