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AI Essay Checker vs GPTZero

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. AI Essay Checker starts at $17, GPTZero at $8.33. Both have a free tier. Only GPTZero ships a public API.

AI Essay CheckerRuns an essay through AI detection, plagiarism checking, grammar fixes and a grade estimate.GPTZeroEstimates whether text was machine-written and flags the sentences

Side by side

FactAI Essay CheckerGPTZero
CategoryAI Detection & HumanizersAI Detection & Humanizers
Pricing modelFreemiumFreemium
Starts at$17 month$8.33 month
Public APINoYes
PlatformsWebWeb, API, Chrome Ext
CompanyKamranAli LimitedGPTZero
Launched20242023
Last verifiedSep 6, 2026Sep 6, 2026

What our research says

AI Essay Checker

Four checks that usually come from four vendors in one $17 subscription, with a free tier large enough to test on a real essay. Unlimited grammar checking at every tier is a genuine bonus. The contradiction is structural: the same account sells AI detection and an AI humaniser, so whatever the detector scores, the vendor also sells the way around it.

Pros

  • AI detection, plagiarism scan, grammar correction and essay grading in one account
  • Grammar checking is unlimited on every tier including free
  • Free tier gives 1,000 detector words a month without a card
  • Interface available in eight languages
  • Named UK legal entity, KamranAli Limited, in the terms of service

Cons

  • Sells an AI humaniser and rewriter alongside the AI detector
  • No API, LMS integration or bulk submission for teachers
  • Word quotas are split across four separate meters, which is easy to misjudge
  • No published detection accuracy figures or independent benchmarking

GPTZero

The most institutionally accepted of the detectors, and the sentence-level highlighting is what makes a result defensible in a conversation with a student — but no detector is evidence, and pricing this one required leaving the vendor's own site.

Pros

  • Sentence-level highlighting shows what drove the score instead of a bare percentage
  • Batch uploads and a developer API make it usable inside an existing review workflow
  • Free tier is generous enough to evaluate properly before paying

Cons

  • Prices are rendered client-side and are not readable without a browser, which makes budgeting awkward
  • API access is a paid add-on rather than part of the standard tier
  • Word-metered quotas punish long documents disproportionately
  • Detection accuracy remains contested and the tool cannot prove authorship

Which one fits

Choose AI Essay Checker if you need

  • Students checking an essay before submitting it
  • Content and SEO writers screening drafts for AI-flagged phrasing
  • Anyone wanting detection, plagiarism and grammar in one subscription

Choose GPTZero if you need

  • Schools and universities that need a defensible second opinion, not a verdict
  • Editors screening freelance submissions at volume
  • Teams wanting provenance reporting on documents they commissioned

More comparisons

All AI Essay Checker alternatives →Browse all AI Detection & Humanizers →