Which AI detectors support Spanish? The cards that name it and the one study that tested it
14 of the 72 AI detectors in the index name Spanish as a supported language on the vendor page recorded in the card's languages field, read 8 and 9 November 2026: QuillBot, Winston AI, Pangram, GPTZero, Copyleaks, Phrasly, Sapling, Proofademic, Walter Writes, Turnitin, Smodin, Compilatio, Quetext and TruthScan. Turnitin is the one vendor to state a separate Spanish model, trained on GPT-3.5 and GPT-4 output (guides.turnitin.com, read 8 November 2026). One indexed study tested detectors on Spanish text: Orenstrakh 2023 ran 10 Spanish human thesis papers and 10 Spanish ChatGPT texts through eight tools and reports that Copyleaks flagged all 10 human papers as AI while catching all 10 ChatGPT texts, and that GPTZero, GLTR and the GPT-2 Output Detector caught 0 of the 10 ChatGPT texts (arXiv 2307.07411, Table 12, read 9 November 2026).
A language on a vendor page means the vendor says the detector accepts it, not that anyone has measured the detector in it. The first table lists the 14 cards that name Spanish, with the count the vendor states, the source, the read date and any indexed study result on Spanish text; the second lists six cards whose pages bear on Spanish without naming it in a list. This page is one of the questions answered from the index; the languages ranking sorts every stated count, the question on machine-translated text covers the translated Spanish in Chaka 2023, and the full cards are on the detectors hub.
| Detector | Spanish on the vendor page | Source | Read date | Indexed study result on Spanish text |
|---|---|---|---|---|
| QuillBot | Spanish named, 6 listed | quillbot.com/blog/quillbot-tools/ai-detector | 8 November 2026 | No indexed study on Spanish text |
| Winston AI | Spanish named, 11 listed | gowinston.ai/ai-content-detector | 8 November 2026 | No indexed study on Spanish text |
| Pangram | Spanish named, 24 listed | pangram.com | 8 November 2026 | No indexed study on Spanish text |
| GPTZero | Spanish named, 5 listed | gptzero.me | 8 November 2026 | Orenstrakh 2023: 9 of 10 Spanish human theses cleared, 0 of 10 Spanish ChatGPT texts caught; Chaka 2023: 0 of 6 Spanish translations classified AI |
| Copyleaks | Spanish named, 11 named of 30 stated | copyleaks.com/ai-content-detector | 8 November 2026 | Orenstrakh 2023: all 10 Spanish human theses flagged as AI and all 10 Spanish ChatGPT texts caught; Chaka 2023: 6 of 6 Spanish translations classified AI |
| Phrasly | Spanish named, 4 listed | phrasly.ai/ai-detector | 8 November 2026 | No indexed study on Spanish text |
| Sapling | Spanish named, 16 listed | sapling.ai/ai-content-detector | 8 November 2026 | No indexed study on Spanish text |
| Proofademic | Spanish named, 23 listed | proofademic.ai/multilingual-detection | 8 November 2026 | No indexed study on Spanish text |
| Walter Writes | Spanish named, 5 named of 20 stated | walterwrites.ai/ai-detector | 8 November 2026 | No indexed study on Spanish text |
| Turnitin | Spanish named, 7 listed | guides.turnitin.com/hc/en-us/articles/284... | 8 November 2026 | None on Spanish text; the vendor states a separate Spanish model trained on GPT-3.5 and GPT-4 |
| Smodin | Spanish named, 7 named of 100 stated | smodin.io/ai-content-detector | 9 November 2026 | No indexed study on Spanish text |
| Compilatio | Spanish named, 8 named of 35 stated | compilatio.net/en/ai-detector-info | 9 November 2026 | No indexed study on Spanish text |
| Quetext | Spanish named, 7 named of 25 stated | quetext.com/ai-content-detector | 9 November 2026 | No indexed study on Spanish text |
| TruthScan | Spanish named, 4 named of 30 stated | truthscan.com/faq | 9 November 2026 | No indexed study on Spanish text |
Which AI detectors name Spanish?
14 cards, read 8 and 9 November 2026. Six name it inside a short list: QuillBot (6 languages), GPTZero (5), Phrasly (4), Turnitin (7), Winston AI (11) and TruthScan (4 named of "over 30"). Eight name it inside a longer stated total: Copyleaks (11 named of 30+), Pangram (24), Sapling (16), Proofademic (23), Walter Writes (5 named of 20+), Smodin (7 named of 100+), Compilatio (8 named of more than 35) and Quetext (7 named of 25), each on the page linked in the table. Turnitin's FAQ is the most specific: a Spanish model exists, "trained on GPT-3.5 and GPT-4" output, and submissions in languages outside its seven are not processed (guides.turnitin.com, read 8 November 2026; Turnitin card). Turnitin Clarity, when the Originality add-on is licensed, shows AI writing results for English, Japanese and Spanish only (guides.turnitin.com, read 9 November 2026).
Turnitin's Spanish model was released on 12 September 2024 and updated on 5 May 2026, according to the vendor's release notes read 9 November 2026; the Turnitin languages question, added that day, gives the dated list for all 7 of its languages.
What did the one Spanish study find?
The non-English evidence ranking, added 9 November 2026, counts this record for Copyleaks, GPTZero, the GPT-2 Output Detector and GLTR beside the other five records on non-English or non-native text.
Orenstrakh, Ramos Rodriguez, Diaz Salgado and Lopez Buenrostro 2023 tested eight detectors on 124 human and 30 ChatGPT submissions from two computing institutions, one in North America working in English and one in South America working in Spanish; the Spanish set was 10 final thesis project papers and 10 ChatGPT texts written to the same assignments (arXiv 2307.07411, read 9 November 2026; Orenstrakh 2023 record). On the Spanish texts, Copyleaks and OpenAI's AI Text Classifier called every submission AI-generated, human or not, so Copyleaks flagged 10 of 10 human theses and caught 10 of 10 ChatGPT texts; the GPT-2 Output Detector, GPTZero, CheckForAI and GLTR cleared the human papers (GPTZero 9 of 10, the others 10 of 10) and caught 0 of 10 ChatGPT texts; Originality.ai cleared 10 of 10 human papers and caught 2 of 10. Averaged over the eight tools, ChatGPT accuracy on Spanish fell to about 17.50% (arXiv 2307.07411, Tables 11 and 12). Copyleaks' Spanish support and its Spanish false positives are the same card read two ways: the vendor names the language (copyleaks.com, read 8 November 2026) and the one study measured it at 10 of 10 human papers flagged in April 2023 (Copyleaks card).
Chaka 2023 is the other record with Spanish in it, machine-translated rather than written: six ChatGPT responses were run through Google Translate into Spanish, German, French, Southern Sotho and isiZulu; GPTZero classified all 30 translations as human-written and Copyleaks classified 6 of 6 Spanish translations as AI-generated (DOI 10.37074/jalt.2023.6.2.12, read 9 November 2026; Chaka 2023 record). Neither study tested Pangram, Sapling, Proofademic, Walter Writes, Smodin, Compilatio, Quetext, TruthScan, QuillBot, Phrasly or Winston AI in Spanish, so for 11 of the 14 cards that name the language the claim stands alone.
Cards whose pages bear on Spanish without naming it in a list
| Detector | Statement | Source | Read date |
|---|---|---|---|
| Turnitin Clarity | AI writing detection inside Clarity, when licensed, works for English, Japanese and Spanish; no language list on the card | guides.turnitin.com/hc/en-us/articles/371... | 9 November 2026 |
| GLTR | No language list; Orenstrakh 2023: 10 of 10 Spanish human theses cleared, 0 of 10 Spanish ChatGPT texts caught | gltr.io | 9 November 2026 |
| GPT-2 Output Detector | No language list; Orenstrakh 2023: 10 of 10 Spanish human theses cleared, 0 of 10 Spanish ChatGPT texts caught | huggingface.co/openai-community/roberta-b... | 9 November 2026 |
| Originality.ai | States 30+ languages with none named; Orenstrakh 2023: 10 of 10 Spanish human theses cleared, 2 of 10 Spanish ChatGPT texts caught | originality.ai | 8 November 2026 |
| Undetectable AI | States 50+ languages, English the only one named | undetectable.ai/ai-detector | 9 November 2026 |
| ZeroGPT | States all languages, none named | zerogpt.com | 8 November 2026 |
Questions about AI detectors and Spanish
Does GPTZero work in Spanish?
GPTZero names Spanish among 5 languages on its site (gptzero.me, read 8 November 2026). In Orenstrakh 2023 it cleared 9 of 10 Spanish human theses and caught 0 of 10 Spanish ChatGPT texts, and in Chaka 2023 it classified 0 of 6 Spanish translations as AI (arXiv 2307.07411; DOI 10.37074/jalt.2023.6.2.12, read 9 November 2026).
Does Turnitin detect AI writing in Spanish?
Turnitin states a Spanish model trained on GPT-3.5 and GPT-4 output and lists Spanish among 7 processed languages (guides.turnitin.com, read 8 November 2026). No indexed study tested Turnitin on Spanish text; its five records are English.
Does Copyleaks work in Spanish?
Copyleaks names Spanish among 11 named of 30+ languages (copyleaks.com, read 8 November 2026). In Orenstrakh 2023 it flagged all 10 Spanish human theses as AI while catching all 10 Spanish ChatGPT texts (arXiv 2307.07411, Table 12, read 9 November 2026).
Which free AI detector supports Spanish?
Phrasly (free with no limit on checks), Smodin (free on the web, 50,000 characters per check), QuillBot (1,200 words per scan free) and Quetext (1,000 words per free scan) each name Spanish on pages read 8 and 9 November 2026 and linked in the table; none has an indexed study in Spanish. The free tiers ranking sets out each free plan.
Is there a study of AI detectors on Spanish text?
One: Orenstrakh et al. 2023, 10 Spanish human theses and 10 Spanish ChatGPT texts through eight tools, average ChatGPT accuracy about 17.50% and Copyleaks at 10 of 10 human papers flagged (arXiv 2307.07411, read 9 November 2026). Chaka 2023 adds six machine-translated Spanish texts.
Sources
All read 8 November 2026 unless a later date is shown; the languages source of every card is linked in the tables.
- Turnitin AI writing detection FAQs: https://guides.turnitin.com/hc/en-us/articles/28477544839821
- Turnitin Clarity instructor FAQs: https://guides.turnitin.com/hc/en-us/articles/37198804513165-FAQs-for-Instructors-using-Turnitin-Clarity (read 9 November 2026)
- Copyleaks AI detector: https://copyleaks.com/ai-content-detector
- GPTZero: https://gptzero.me/
- QuillBot AI detector languages: https://quillbot.com/blog/quillbot-tools/ai-detector/
- Phrasly AI detector: https://phrasly.ai/ai-detector
- Winston AI detector: https://gowinston.ai/ai-content-detector/
- Pangram: https://www.pangram.com/
- Sapling AI detector: https://sapling.ai/ai-content-detector
- Proofademic multilingual detection: https://proofademic.ai/multilingual-detection/
- Walter Writes AI detector: https://walterwrites.ai/ai-detector/
- Smodin AI detector: https://smodin.io/ai-content-detector (read 9 November 2026)
- Compilatio AI detector information: https://www.compilatio.net/en/ai-detector-info/ (read 9 November 2026)
- Quetext AI detector: https://www.quetext.com/ai-content-detector (read 9 November 2026)
- TruthScan FAQ: https://truthscan.com/faq (read 9 November 2026)
- Orenstrakh et al. 2023: https://arxiv.org/abs/2307.07411 (read 9 November 2026)
- Chaka 2023: https://doi.org/10.37074/jalt.2023.6.2.12 (read 9 November 2026)
Revision log: 2026-11-09: page created from the languages field of 38 cards and the Orenstrakh 2023 and Chaka 2023 records at index version 2026.11.5; 2026-11-09: non-English evidence ranking linked (seventh wave); 2026-11-09: eighth-wave pages linked
Related pages: Does Gradescope have AI detection? What Gradescope's and Turnitin's own pages state, What is the minimum word count for an AI detector? Every hard minimum and every recommended floor in the index, in words, AI detectors ranked by study records on non-English and non-native text and Questions about AI detectors, answered from the index.