Comparison · 2026
ZeroGPT vs Originality.ai - Free vs Paid
ZeroGPT is free. Originality.ai is paid. Which one does the better job on GPT-5.5 outputs in 2026?
Paid baseline. Strong on long-form GPT-5.5.
- Pricing
- $14.95+ /mo
- Modalities
- Text
- Best for
- Paid SEO content workflows.
- Watch out
- No free tier.
Free, fast, generous quota.
- Pricing
- Free / $9.99+
- Modalities
- Text
- Best for
- Quick free-tier sanity checks.
- Watch out
- Higher FPR on edited writing.
Takeaways
Bottom line
- Originality.ai for paid SEO use; ZeroGPT for quick free checks.
- Both miss multi-modal entirely - pick ai-detectors.io if you need image/audio/video.
- Neither publishes a transparent benchmark like RAID.
FAQ
Common questions
Accuracy varies by model and modality. ai-detectors.io publishes 99.1% on the RAID benchmark for text and 96.9-98.4% across image, audio and video. Originality.ai and GPTZero are competitive on text only.
Some are. ai-detectors.io's free tier covers text and image with $1 in scan credit. ZeroGPT and Scribbr have free tiers but flag edited prose more often.
Yes - every detector in this list claims GPT-5.5 coverage. The accuracy gap shows up on edited prose and ESL writing, not on raw model outputs.
We're upfront: this list is curated, but every entry is real, current as of 2026, and we tell you where each competitor wins. We don't include vapor or affiliate-pumped tools.
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Get $1 free credit - start scanning.
Lifetime scan history. Every plan. No retention tier.