IsItAI vs Sapling AI Detector: AI detector comparison
A side by side look at pricing, methodology, language support and best-fit use case. Every claim on this page is linked to a source at the bottom.
Last updated . Reviewed by IsItAI Editorial.
At a glance
IsItAI
UK, 2024UK-built AI detection that gives you a confidence score, not a verdict.
- Pricing
- From £4.99/month
- Free tier
- 5 scans/day free
- API
- Yes
- Languages
- 30
Sapling AI Detector
US, 2020Detection bundled inside a broader writing-assistant suite.
- Pricing
- From $25/month (Pro)
- Free tier
- 2k characters free per check
- API
- Yes
- Languages
- 5
Side by side
| Feature | IsItAI | Sapling AI Detector |
|---|---|---|
| Free tier | 5 scans/day free | 2k characters free per check |
| Starting price | From £4.99/month | From $25/month (Pro) |
| Cost per 1k words | £0.05 (Pro plan equivalent) | $0.13 |
| API available | Yes | Yes |
| Languages supported | 30 | 5 |
| Founded | 2024 | 2020 |
| Country | UK | US |
| Primary audience | Educators, recruiters and content teams | Customer support and sales operations |
| Best for | Teachers, students and recruiters who want a clear confidence score and source-passage highlighting | Customer-support teams already using Sapling for grammar |
| Known weakness | Smaller brand than US incumbents | Detection is a side-feature, not the core product |
How each tool works
IsItAI
Method: Multi-model ensemble. Combines several open detectors and weights agreement. Returns a confidence band rather than a binary verdict.
Data handling: GDPR compliant. UK and EU hosted. Submitted text is not stored after the scan completes.
Sapling AI Detector
Method: Classifier built into the broader Sapling writing-assistant API.
Data handling: Enterprise tier offers data-residency control.
How accurate are AI detectors? What the research says
Two findings from independent academic research apply to almost every detector on this list, including IsItAI and Sapling AI Detector.
1. False positives on non-native English writers. Liang et al. (Stanford, 2023) found that GPT detectors flagged over half of TOEFL essays written by non-native English speakers as AI-generated, while flagging almost none of the essays from US students. If your use case involves non-native English writers, never treat a detector verdict as proof on its own.
2. Paraphrasing reliably defeats classifiers. Sadasivan et al. (Maryland, 2023) showed that running AI output through a paraphraser drops detection performance close to chance. Both IsItAI and Sapling AI Detector are vulnerable to this.
Where IsItAI wins
- Wider language support at 30 versus 5 languages.
- Built for educators, recruiters and content teams.
- Method: Multi-model ensemble. Combines several open detectors and weights agreement. Returns a confidence band rather than a binary verdict.
Where Sapling AI Detector wins
- Built for customer support and sales operations.
- Method: Classifier built into the broader Sapling writing-assistant API.
Which one should you pick, IsItAI or Sapling AI Detector?
IsItAI suits teachers, students and recruiters who want a clear confidence score and source-passage highlighting. Sapling AI Detector suits customer-support teams already using sapling for grammar. Pick based on which fits your workflow. Treat any detector verdict as a screening signal, not proof.
Frequently asked questions
Is IsItAI free?
5 scans/day free
Is Sapling AI Detector free?
2k characters free per check
Can either tool be fooled by paraphrasing?
Yes. Sadasivan et al. (2023) demonstrated that paraphrasing reliably defeats most AI classifiers. Treat any detector verdict as a screening signal, not proof.
Are AI detectors fair to non-native English writers?
Independent research (Liang et al. 2023) found high false-positive rates for non-native English writing. Always combine a detector signal with other evidence, never use it as a sole basis for an academic or hiring decision.
Which one should I pick if I have to choose one, IsItAI or Sapling AI Detector?
IsItAI suits teachers, students and recruiters who want a clear confidence score and source-passage highlighting. Sapling AI Detector suits customer-support teams already using sapling for grammar. Pick based on which fits your workflow. Treat any detector verdict as a screening signal, not proof.
Try IsItAI free
5 free scans a day. No credit card. UK hosted and GDPR compliant.
Sources and further reading
- IsItAI homepage
- Pricing
- How it works
- Sapling AI content detector
- Sapling pricing
- Liang et al. (Stanford, 2023): GPT detectors are biased against non-native English writers
- Sadasivan et al. (2023): Can AI-generated text be reliably detected?