IA Checker vs Sapling: Which AI Detector Should You Use in 2026?

Positioning

Sapling's detector page is unusually careful for this market: it states that no current detector, including its own, should be used as a standalone check. That honesty is a genuine strength.

Sapling also publishes concrete free limits (2,000 characters per query), paid length up to 100,000 characters, sentence perplexity scores, an extension and an API. Those are real product advantages for developers and high-volume reviewers.

IA Checker is a European workspace. Detection is the front door; rewriting, plagiarism review, translation and EU AI Act labelling are what follow. We do not publish a public detection API today.

Scorecard

Counted from the 21 rows in the table below, not asserted separately.

1. 9IA Checker ahead
2. 8Tied
3. 4Sapling ahead

Feature comparison

Feature	IA Checker	Sapling	Ahead
Accuracy
Detection engines	Multiple engines (Advanced and Ultra), with Pangram integration in progress	A single Sapling detector, with complementary whole-text and per-sentence scoring (sapling.ai)	IA Checker
Sentence-level signals	Per-sentence signals with the passages that drove the score	Its site describes overall scores plus per-sentence perplexity highlighting (sapling.ai)	Tied
How a result is framed	An indicator, with limits and appeal guidance published alongside the score	Its detector page states no current detector should be used as a standalone check (sapling.ai)	Tied
Published accuracy claims	No universal accuracy headline; methodology documented on the site	Its FAQ publishes 97%+ detection and under 3% false positives on longer-text benchmarks (sapling.ai)	Sapling
Minimum useful length guidance	Checks from a few hundred characters upward	Its site states the detector becomes much more accurate after about 50 words (sapling.ai)	Tied
Coverage
Text detection	Yes	Yes	Tied
Image and video detection	Dedicated image and video detection routes	Detection on its public pages is focused on text, PDF and DOCX (sapling.ai)	IA Checker
PDF and DOCX upload	PDF and DOCX extraction on paid plans	PDF and DOCX upload buttons are advertised on its detector page (sapling.ai)	Tied
Writing tools around the score	Humanizer, paraphraser, translator, grammar and EU labelling in one workspace	Autocomplete, rephrase and broader writing assistance are part of the Sapling suite (sapling.ai)	Tied
Pricing
Free detector limit	Free checks up to 20,000 characters	Its detector page states free users are truncated to 2,000 characters per query (sapling.ai)	IA Checker
Entry paid plan	€4.90 per month for 100,000 words, 25,000 characters per check	Its pricing page lists Pro at $25 per month for individuals (sapling.ai)	IA Checker
Long-document paid limit	25,000 to 300,000 characters per check by plan	Its detector page states Pro and Enterprise can paste up to 100,000 characters (sapling.ai)	Tied
Privacy
Retention of submitted text	Kept only for the duration of the requested operation unless you save it	Its privacy policy states user content is stored and used to improve the Service (sapling.ai)	IA Checker
Training / improvement on submissions	Not used for model training without express opt-in	Its privacy policy states content is stored and used only to improve the Service (sapling.ai)	IA Checker
Hosting region	European Union	Its privacy policy states services are hosted in the United States (sapling.ai)	IA Checker
Selling personal data	Does not sell personal data	Its privacy policy states it does not sell or rent customer data (sapling.ai)	Tied
Workflow
Public API	No public API	A metered AI detector API is published, with docs linked from the detector page (sapling.ai)	Sapling
Browser extension	None	An AI Content Detector for ChatGPT extension is advertised (sapling.ai)	Sapling
Shareable certificates	No shareable detection certificate product	Its detector UI advertises a share certificate that expires after three days (sapling.ai)	Sapling
Compliance
EU AI Act labelling	Built-in labelling tool with the official Article 50 disclosure icons	Not part of the published detector suite	IA Checker
GDPR posture	EU-established, GDPR-first	Its privacy policy names an Article 27 EU representative while hosting in the United States (sapling.ai)	IA Checker

Honest caveats versus multi-engine architecture

Sapling's detector page does something rare: it tells you not to treat any detector, including itself, as a standalone check. That is the right default for educators and reviewers, and it deserves credit.

On iachecker.com we take the next step in product shape. More than one engine makes disagreement visible; limits sit next to the score. A careful disclaimer on a help page is useful. A UI that makes over-trust harder is better when a score feeds a decision.

If you only need a quick probability with perplexity highlights, Sapling's published detector is a clean tool. If the result has to survive challenge, start at iachecker.com and still test both.

Free length, API and the developer path

Sapling's free detector is short by design: 2,000 characters per query on its public page. Our free checks run to 20,000 characters. On free length for real documents, that is a clear gap in our favour.

Where Sapling is ahead is distribution for builders: a published API, a browser extension, and a writing suite already in Chrome, Docs and Outlook. We concede those rows.

Choose by workflow. Paste-and-decide on longer free text points at us. Embed detection in another product points at Sapling.

What happens to the text you paste

Sapling's privacy policy is direct: user content is stored and used to improve the Service, and the product is hosted in the United States. Read that page yourself before pasting unpublished work.

We keep submitted content only for the requested operation unless you save it, do not train on it without express opt-in, and process in the European Union.

Sapling also lists an EU Article 27 representative. That helps rights requests; it does not make US hosting into EU hosting. For procurement, those are different answers.

IA Checker vs Sapling FAQ

Is Sapling's AI detector accurate?

Sapling's FAQ publishes 97%+ detection and under 3% false positives on longer-text benchmarks, and its detector page also warns that no detector should be used alone. On iachecker.com we do not lead with a headline percentage: we run more than one engine, show where they disagree, and keep the limits next to the score. That is a stronger setup for real decisions even when a competitor publishes a louder number. Test both on your own writing.

What is Sapling's free AI detector limit?

Its detector page states free users are truncated to 2,000 characters per query, while Pro and Enterprise can paste up to 100,000 characters. IA Checker offers free checks up to 20,000 characters. Verify both live pages before relying on a number.

Does Sapling offer an AI detector API?

Yes. Its detector page links API docs and its pricing page lists a metered API plan. IA Checker does not publish a public detection API today. If programmatic checks are the requirement, that is a real reason to choose Sapling.

Does Sapling store text submitted to the detector?

Its privacy policy states that user content is stored by Sapling and used to improve the Service, and that services are hosted in the United States. Read the policy directly rather than relying on a short summary.

IA Checker vs Sapling: which should I choose?

Choose Sapling for API access, a browser extension and writing assistance in one brand. Choose IA Checker on iachecker.com for longer free checks, multi-engine detection, EU hosting, short retention and EU AI Act labelling. Both warn, in different ways, against treating a score as proof.

Read next

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• Try the AI detector
• All comparisons