Monica AI content detector
Vendor Butterfly Effect Pte. Ltd. Official site monica.im/tools/ai-content-detector How this card is sourced
Updated · AI Detector Index editors
Monica's AI detector states a 98% (detection accuracy) figure and attributes it to three other products: "We currently integrated 3 AI detection models, including GPTZero, CopyLeaks, and ZeroGPT, so the detection accuracy is as high as 98%" (monica.im/tools/ai-content-detector, FAQ, read 10 November 2026). The vendor is Butterfly Effect Pte. Ltd., the Singapore-law company behind the Monica assistant, whose Terms of Use were last updated on 1 December 2025 and whose Privacy Policy states that its servers and central databases are located in the United States (monica.im/terms and monica.im/privacy, read 10 November 2026). The detector is one tool inside a browser extension and app suite that also sells a Bypass AI humanizer on the same page, so the card belongs with the tools in the detector index that check and rewrite in one place, and how this card is sourced explains why a detector that calls other detectors is recorded on its own vendor's words.
What Monica detects
| Field | Value | Source |
|---|---|---|
| Content types detected | Text | monica.im/tools/ai-content-detector |
| Generators covered | GPT (vendor wording: GPT, GPT-3.5, GPT-4), Claude, Gemini, LLaMa, other large language models (LLMs) (vendor wording; the page also says over 8 of the most advanced AI models) | monica.im/tools/ai-content-detector |
| Languages | English, Spanish | monica.im/tools/ai-content-detector |
| Input limits | Web tool at monica.im/tools/ai-content-detector: a paste box counting 0 / 250 words, with sample texts labelled GPT, Human and AI + Human. The detector box's notice (served in the page's language bundle) states Every 5 words costs 1 Advanced Credits, Word limit reached. Upgrade to continue and 2 detectors are locked. Upgrade to unlock, so the free check runs one of the three integrated detectors. No upload format is published. | monica.im/tools/ai-content-detector |
| Free tier | FAQ: new users receive a free quota to use our AI detector free online; the page also says we offer free trial credits. No figure is published; the free plan in the plans API carries 0 Advanced Credits and the detector meters 1 Advanced Credit per 5 words | monica.im/tools/ai-content-detector |
| Integrations | Chrome and Edge browser extension (Add to Chrome on the detector page), Desktop apps for Windows and Mac, Mobile apps for Android and iOS, Monica Code for VS Code and JetBrains (not a detector surface) | monica.im/tools/ai-content-detector |
| Data retention | Privacy Policy (last updated 14 June 2024, effective 28 February 2023): When you use our services, we collect information from the inputs, file uploads, and feedback (Content) you provide. This data is essential for the effective functioning of the History feature. Retention section: The Company will retain Your Personal Data only for as long as is necessary for the purposes set out in this Privacy Policy. No period is stated for submitted text; the policy also states that information may be transferred, stored or processed in the United States where our servers or central databases are located. | monica.im/privacy |
| Ownership | Monica is a product of Butterfly Effect Pte. Ltd. (site footer, copyright 2026). The Terms of Use (last updated 1 December 2025) are governed by the laws of Singapore and give the company's notice address as Butterfly Effect Pte. Ltd., 455 Market St Ste 1940, PMB 846230, San Francisco, CA 94105-2448, USA; the Privacy Policy (last updated 14 June 2024, effective 28 February 2023) states that servers and central databases are located in the United States. The AI detector is one tool inside the Monica assistant (browser extension, desktop and mobile apps) and the page states that it combines three third-party detectors: We currently integrated 3 AI detection models, including GPTZero, CopyLeaks, and ZeroGPT. The same page sells a Bypass AI humanizer beside the detector. | monica.im/terms |
The page describes the product as "an accurate and fast content analysis tool that can be used to detect any machine-generated content" and names its coverage in one sentence: the tool "is capable of detecting content generated by over 8 of the most advanced AI models", able to "analyze text created by models such as GPT, GPT-3.5, GPT-4, Claude, Gemini, LLaMa, and other large language models (LLMs)" (monica.im/tools/ai-content-detector, read 10 November 2026). The card counts four generator families from that list, GPT once with its versions, then Claude, Gemini and LLaMa, and prints the "over 8" as the vendor's own figure. The method is the three third-party calls: a section headed "98% Accurate AI Integration" shows the ZeroGPT, GPTZero and Copyleaks marks and says the tool "combines the power of ZeroGPT, GPTZero, and Copyleaks AI content detectors", and the Authentic Detection Data block adds that "our system uses real-time API calls for every analysis". The cards for GPTZero, Copyleaks and ZeroGPT carry the study records for those three engines; no indexed study ran them through Monica.
Language is stated without a count. The Multilingual Precision block says the detection models "are specifically trained to excel in analyzing content written in English, Spanish, and other widely-used languages", and the detector box's notice, served in the page's language bundle, says Monica "provides the best support for English, Spanish, and Portuguese, and other languages may not achieve optimal optimization results" (monica.im/tools/ai-content-detector, read 10 November 2026). The card lists English and Spanish and records no count, so Monica is unranked in the languages ranking.
Input is paste only. The box counts "0 / 250 words" and offers sample texts labelled GPT, Human and AI + Human; the bundle's strings add "Every 5 words costs 1 Advanced Credits", "Word limit reached. Upgrade to continue" and "2 detectors are locked. Upgrade to unlock", which means a free check runs one of the three engines and a paid account runs all three (monica.im/tools/ai-content-detector, read 10 November 2026). No upload format and no detector API are published; the site's For Developers item leads to the Monica API Platform, which lists chat and image generation models and no detection endpoint (platform.monica.im, read 10 November 2026). The detector also lives inside the Chrome and Edge extension the page links with Add to Chrome, the Windows and Mac desktop apps and the Android and iOS apps, which is how the card reaches two surfaces in the platform integrations ranking.
Limits and plans
| Plan | Price | Limits | Checked on |
|---|---|---|---|
| Free | US$0 | 0 Advanced Credits (plans API free_monthly and free_yearly); new-user free quota for the detector per the tool page. | |
| Starter | US$9.90/month, or US$99/year (shown as US$8.30 a month) | 1,500 Advanced Credits (plans API starter_monthly and starter_yearly, display_monthly_price 8.3 on the annual plan). | |
| Boost | US$19.90/month, or US$199/year (shown as US$16.60 a month) | 3,000 Advanced Credits (plans API boost_monthly and boost_yearly). | |
| Elite | US$24.90/month, or US$199/year (shown as US$16.60 a month) | 4,500 Advanced Credits (plans API elite_monthly and elite_yearly). | |
| Ultra | US$99.90/month, or US$995/year (shown as US$82.90 a month) | 20,000 Advanced Credits (plans API ultra_monthly and ultra_yearly). | |
| Team | US$39.90 per seat per month | 4,500 Advanced Credits a seat (plans API team_monthly); annual team plan listed in the same response. | |
| Credit add-ons | US$10 for 4,000, US$30 for 12,000 and US$100 for 40,000 Advanced Credits | Addon packages in the plans API (add_package_4000, add_package_12000, add_package_28000, the last carrying 40,000 credits). |
The free allowance has no figure. The FAQ says "new users receive a free quota to use our AI detector free online", the page offers "free trial credits", and the subscription plans API the pricing page calls lists the free plan with 0 Advanced Credits (monica.im/api/vip/get_subscription_plans_v2, read 10 November 2026). Because the detector meters 1 Advanced Credit per 5 words and the vendor publishes no monthly word figure, Monica sits in the second table of the free tiers ranking.
The pricing page renders its cards by script from that plans API, so the figures below are the API's US dollar values as read 10 November 2026 through a US visitor's request (get_subscription_plans_v2); the API keys are written as plan names because the server HTML carries none, and the page's own meta description still names Pro, Pro plus and Unlimited.
Advanced Credits are shared across the suite: the pricing page's note says they "can be used for various advanced features such as image generation, chat context limit settings, and more powerful ChatPDF", and the plans API's payment platform is Paddle (monica.im/pricing, read 10 November 2026). At 1 credit per 5 words, the detector's cost in words per plan is a derivation the vendor does not publish, so the card prints the credit figures and the per-word rate and no word total.
Retention is open-ended. The Privacy Policy, last updated 14 June 2024 and effective from 28 February 2023, states: "When you use our services, we collect information from the inputs, file uploads, and feedback ('Content') you provide. This data is essential for the effective functioning of the 'History' feature", and its retention section says: "The Company will retain Your Personal Data only for as long as is necessary for the purposes set out in this Privacy Policy" (monica.im/privacy, read 10 November 2026). No period and no deletion-after-processing statement exists, so the retention field is empty and the clause is quoted in the second table of the data retention ranking; the same policy says data "may be transferred, stored or processed in the United States".
What the vendor claims
Our tool is capable of detecting content generated by over 8 of the most advanced AI models, with an impressive 98% (detection accuracy). It can analyze text created by models such as GPT, GPT-3.5, GPT-4, Claude, Gemini, LLaMa, and other large language models (LLMs). FAQ: We currently integrated 3 AI detection models, including GPTZero, CopyLeaks, and ZeroGPT, so the detection accuracy is as high as 98%. Section heading: 98% Accurate AI Integration.
The claim is the 98%, stated three times on the tool page: in the opening copy ("an impressive 98% detection accuracy"), in the section heading "98% Accurate AI Integration" and in the FAQ answer that ties it to the three integrated engines (monica.im/tools/ai-content-detector, read 10 November 2026). No test set, date or false positive rate is published, so Monica sits in the vendor table of the claim versus evidence ranking with no gap computed and has no row in the false positive ranking. The Terms of Use add the vendor's own caveat: the Company "makes available the output of third-party AI services and is not the provider of any AI service or its output and is not responsible for such AI service or output" (monica.im/terms, read 10 November 2026).
On rewritten text the page runs the other way. Beside the detector it sells a bypass tool that "converts content created by GPT, GPT-4, Gemini, and other AI models into text that scores as 98% human", and the FAQ "How to get a high human score with an AI detector?" answers: "optimize the AI-generated content right away and you're ready to pass an AI detector" (monica.im/tools/ai-content-detector, read 10 November 2026). The card records no statement that the detector catches paraphrased or humanized text.
What independent studies found
No record in the studies index tested Monica's detector. The three engines it calls have their own records: GPTZero's RAID 2024 false positive rate of 0.00% at threshold 0.5 and its 60.04% true positive rate after humanizers in DAMAGE 2025, Copyleaks' 100% of 126 documents in Walters 2023 and ZeroGPT's 1.42% at threshold 0.5 in RAID 2024 sit on the GPTZero, Copyleaks and ZeroGPT cards with their sources (arXiv 2405.07940, Table 4, read 10 November 2026). Whether Monica reports one engine's verdict or a combination of the three, and how a free check that runs one engine differs from a paid check that runs all three, is not published, so none of those figures transfers to this card.
Where Monica appears in the index
Rankings
Fits these use cases
- Not listed in a use-case view at this index version.
Monica qualifies for two stated-value rankings, read 10 November 2026 in the data file: generator models named at four (GPT, Claude, Gemini and LLaMa) and platform integrations at two surfaces, the browser extension and the mobile apps. It is unranked in the free tier, language, input limit, retention, false positive and claim gap rankings, each of which needs a figure the vendor does not publish, and the GPT models its page lists are the kind of claim the question on which detectors claim ChatGPT coverage sets beside the studies. The pairing of a detector with a humanizer on one page is shared with Undetectable AI and StealthWriter, two sibling cards whose vendors also sell rewriting beside checking. Every detector card on the register shows the same fourteen fields, so a detector that borrows three engines can be read in the same columns as the engines themselves.
Questions about Monica AI content detector
Is Monica's AI detector free?
Partly: the FAQ says new users receive a free quota, the detector box takes 250 words a check, and the bundle's notice says every 5 words costs 1 Advanced Credit with two of the three engines locked until an upgrade, read 10 November 2026. No free word figure is published.
How much does Monica cost?
US$9.90 a month on Starter with 1,500 Advanced Credits, US$19.90 on Boost (3,000), US$24.90 on Elite (4,500) and US$99.90 on Ultra (20,000), or US$99, US$199, US$199 and US$995 a year, from the plans API the pricing page calls, read 10 November 2026.
How accurate does Monica say its detector is?
98% (detection accuracy), which the FAQ attributes to the three integrated engines, GPTZero, Copyleaks and ZeroGPT, read 10 November 2026. No test set, date or false positive rate is published.
Which AI models does Monica's detector cover?
GPT, GPT-3.5, GPT-4, Claude, Gemini, LLaMa and "other large language models", with the page's own figure of "over 8 of the most advanced AI models", read 10 November 2026; the card counts four model families.
Does Monica store the text you check?
The Privacy Policy of 14 June 2024 says submitted inputs are collected for the History feature and retained "only for as long as is necessary", with servers in the United States, read 10 November 2026. No deletion period is stated.
Sources and revisions
Sources
- monica.im/tools/ai-content-detectorRead 10 November 2026
- monica.im/pricingRead 10 November 2026
- monica.im/api/vip/get_subscription_plans_v2Read 10 November 2026
- monica.im/privacyRead 10 November 2026
- monica.im/termsRead 10 November 2026
- platform.monica.imRead 10 November 2026
- arxiv.org/pdf/2405.07940Read 10 November 2026
