Smodin (smodin.io) is an AI-powered platform founded in 2017[1] that provides writing and content tools including an AI detector, AI humanizer, plagiarism checker, paraphrasing, translator, text summarizer, and AI chat.
Pros
- No false positives on human-written content.
- AI detector, chat, and plagiarism do not require credits (with account).
Cons
- 0/7 detection rate against LLMs.
- 1/8 detection rate against AI humanizers.
- 4/10 plagiarism detection.
Features
- AI detector: Detects AI in text and some file types (.txt, .pdf, .docx, .doc).
- AI writer: Creates or improves upon essays, articles, and other writing.
- AI humanizer: Rewrites AI content to sound more natural.
- AI chat: All-in-one writing tool, real-time search, and context-aware conversations.
- Plagiarism checker: Scans for content authenticity against online sources.
- Translator: Translates text or files into multiple languages.
- Summarizer: Extracts key information from long content.
- Paraphraser: Rewrites content to avoid plagiarism and create authentic work.
- Chrome extension
- WordPress plugin
- API
Pricing Plans [2]
| Starter | Premium |
| $12.99/month or $155.88/year | $19.99/month or $239.88/year |
| Limited queries and 1500 credits per month. | Higher volume of queries, more credits. |
| Standard AI detector, humanizer, writer, and other tools. No Chrome extension or API access. | All advanced AI tools plus Chrome extension and API access. |
Credit Usage
- AI Detection: No credits needed
- Plagiarism Detection: No credits needed
- AI Chat: No credits needed
- AI Writer/Rewriter: 2 credits = 1 prompt
- AI Humanizer: 1 credit = 2000 characters (~300-400 words)
Test #1: Smodin vs. LLMs
This first test was conducted to determine how accurate Smodin is at detecting AI-written content. Seven LLMs were given the same prompt, and the resulting paragraph of text was copied into Smodin’s AI detector.
Prompt Used
“I need you to write a 500-word article on the founding of Ferrari. Do not use em dashes. Write in a conversational, human tone to try to pass AI detection tools.”
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| LLM | Test Result | Proof |
| ChatGPT – 5.3 Instant Model | 10% AI
❌ |
 |
| Claude – Sonnet 4.6 | 12% AI
❌ |
 |
| Google Gemini – Thinking | 34% AI
❌ |
 |
| Deepseek – Deepthink | 0% AI
❌ |
 |
| Perplexity – Free Model | 16% AI
❌ |
 |
| Grok – Auto |
16% AI ❌ |
 |
| Meta – Instant | 0% AI
❌ |
 |
Test #2: Smodin vs AI Humanizers
The humanizer test was undertaken to verify Smodin’s AI detecting capabilities against AI humanizers. Eight AI platforms were given the same piece of writing to humanize (taken from DeepSeek’s generated text above), which was then fed through Smodin’s AI detector.
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| AI Humanizer | Test Result | Proof |
| Humanize.ai (humanized text) |
0% AI
❌ |
 |
| StealthGPT (humanized text) |
0% AI
❌ |
 |
| WriteHuman.ai (humanized text) |
0% AI
❌ |
 |
| Undetectable.ai (humanized text) |
64% AI
✅ |
 |
| StealthWriter.ai (humanized text) |
0% AI
❌ |
 |
| WalterWrites.ai (humanized text) |
0% AI
❌ |
 |
| Grammarly (humanized text) |
22% AI
❌ |
 |
| Quillbot (humanized text) |
0% AI
❌ |
 |
Test #3: False-Positives + Plagiarism
The false-positive test used 10 human-written articles, publications, and literary works to evaluate Smodin’s ability to correctly identify them as human-written. The same texts were also run through Smodin’s plagiarism checker to evaluate its ability to detect copyrighted content and assess its database limitations.
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| Article URL | Test Result | Proof |
| PBS Interview
(Source) |
100% Human, 14% Plagiarism ✅ |
 |
| FDR’s First Inaugural Address
(Source) |
100% Human, 90% Plagiarism
✅ |
 |
| CNN Article
(Source) |
100% Human, 18% Plagiarism
✅ |
 |
| Boston Globe Article
(Source) |
100% Human, 8% Plagiarism
✅ |
 |
| Moby Dick (Ch. 2)
(Source) |
100% Human, 99% Plagiarism
✅ |
 |
| Daily Dot Article
(Source) |
84% Human, 0% Plagiarism
✅ |
 |
| National Library of Medicine Article
(Source) |
100% Human, 10% Plagiarism
✅ |
 |
| Financial Times Article
(Source) |
93% Human, 0% Plagiarism
✅ |
 |
|
Smithsonian Magazine Interview (Source) |
100% Human, 97% Plagiarism
✅ |
 |
|
Substack Article (Source) |
96% Human, 76% Plagiarism
✅ |
 |
Is Originality AI Trustworthy?
Smodin.io does not currently have a rating on TrustPilot due to a breach of guidelines for multiple fake reviews. Out of the 500+ reviews, however, 75% of them are 5 stars.
There are over one hundred 1-star reviews, with the top complaints being unhelpful customer service and refund requests being denied. 
Frequently Asked Questions
Do unused credits carry over?
No, any credits not used after 30 days are lost.
Are sentence-by-sentence breakdowns provided?
Yes, the detector shows the probability of AI in each sentence and ranks them low, medium, or high impact (see image).
Is document scanning included?
Yes, Smodin accepts .txt, .doc, .docx, .pdf file types.[3]
Is image scanning included?
No, image scanning is not available on Smodin.
Are reports shareable?
Yes, users are able to download a full time-stamped PDF report of AI scans (see sample).
Does Originality.ai provide certifications?
No, there is no mention of SOC 2, ISO certifications, or formal compliance disclosures.
Are AI detections stored long term?
No, user content output is not saved or shared with third parties.[4]