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.
For a deeper breakdown of how accuracy claims hold up across 2026 testing, see our guide to how accurate AI detectors actually are in 2026.
Where IsItAI wins
- Purpose-built for education and hiring, with passage-level highlighting and a confidence band rather than a binary verdict. Sapling's detector is a side-feature of a customer-support writing assistant.
- Wider language coverage at 30 languages versus 5.
- GDPR compliant, UK and EU hosted, and submitted text is not stored after the scan.
Where Sapling AI Detector wins
- Fits support and sales teams already running Sapling for grammar and autocomplete, as one more feature in that stack.
- Enterprise tier offers explicit data-residency control for regulated buyers.
- API-first design built for operations workflows rather than the classroom.
Which one should you pick, IsItAI or Sapling AI Detector?
Pick IsItAI if you are a teacher, student or recruiter who wants clear flagged passages, a confidence band and a no-storage GDPR tool from GBP 4.99/month. Pick Sapling if your support or sales team already runs it and wants detection inside that stack, accepting $25/month and that detection is a side-feature. Both can be evaded by heavy paraphrasing (Sadasivan et al. 2023).
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?
Pick IsItAI if you are a teacher, student or recruiter who wants clear flagged passages, a confidence band and a no-storage GDPR tool from GBP 4.99/month. Pick Sapling if your support or sales team already runs it and wants detection inside that stack, accepting $25/month and that detection is a side-feature. Both can be evaded by heavy paraphrasing (Sadasivan et al. 2023).
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?