Comparisons

Academi.cx vs Ryne AI Accuracy Test

We compared each detector’s overall AI scores and sentence-level highlights with Turnitin’s results across five essays.

Brayden · 2 min read

Ryne AI offers a range of student tools, from essay writing and AI humanization to reports it describes as equivalent to Turnitin. That last claim makes it a natural comparison for Academi.cx. We put both detectors alongside Turnitin to find out how closely each delivers on the promise of showing students what to expect before submission.

Watch the full comparison on YouTube

How the test worked

Five essays were sourced from IvyPanda, a free essay database with no affiliation to Academi.cx. Selected paragraphs in each essay were rewritten using ChatGPT to introduce AI-generated content. The same version of each document was then submitted to Academi.cx, Ryne AI, and Turnitin. We compared how closely Academi.cx and Ryne AI matched Turnitin’s overall AI scores and sentence-level highlights.

The results from each detector

Five-paper AI score comparison. Document 1: Academi.cx 82%, Ryne AI 88%, Turnitin 100%. Document 2: 30%, 48%, and hidden below 20%. Document 3: 22%, 55%, and 24%. Document 4: 32%, 45%, and 35%. Document 5: 45%, 45%, and 36%. Capped blue lines show Academi.cx predicted Turnitin ranges.
  • Document 1: Academi.cx detected 82%, predicting 74 to 100%. Turnitin returned 100%, inside the range. Ryne predicted 88%, 12 points below Turnitin.
  • Document 2: Academi.cx detected 30%, predicting 22 to 34%. Turnitin's exact score was hidden below 20%. Ryne predicted 48%.
  • Document 3: Academi.cx detected 22%, predicting 14 to 26%. Turnitin returned 24%, inside the range. Ryne predicted 55%, 31 points above Turnitin.
  • Document 4: Academi.cx detected 32%, predicting 26 to 36%. Turnitin returned 35%, inside the range. Ryne predicted 45%, 10 points above Turnitin.
  • Document 5: Academi.cx detected 45%, predicting 35 to 51%. Turnitin returned 36%, inside the range. Ryne also predicted 45%, putting both detectors 9 points above Turnitin.

Why the sentence highlights matter more than the percentage

A predicted percentage that happens to land close to Turnitin's score doesn't mean much if the detector got there by flagging the wrong sentences. Academi.cx's highlighted sentences consistently lined up with what Turnitin actually flagged, paragraph after paragraph. Ryne's detection looked different, sentences flagged seemingly at random, entire AI generated paragraphs missed entirely, and non-AI sentences flagged instead. The pattern suggested Ryne's detector was evaluating individual sentences in isolation rather than accounting for the surrounding context the way Academi.cx and Turnitin do.

Average deviation from Turnitin: Academi.cx, shown in blue, 8 percentage points; Ryne AI, shown in purple, 15.5 percentage points. Values are mean absolute differences based on Documents 1, 3, 4, and 5. Document 2 is excluded because its exact Turnitin score is hidden.

The final scorecard

Across five documents, Academi.cx's predicted ranges captured all four visible Turnitin scores, although the range for the remaining essay was above Turnitin's under-20% result. Ryne AI overestimated in nearly every round, sometimes by more than 20 points, and its sentence level detection varied widely from document to document. Ryne has publicly claimed accuracy near 99% against Turnitin. Based on this comparison, that claim doesn't hold up. We make a similar accuracy claim, but back it with a benchmark where the next-best detector still averaged more than four times our error against Turnitin.

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