Best AI Detector | Free & Premium Tools Tested

AI detectors are tools designed to detect when a text was generated by an AI writing tool like ChatGPT. AI content may look convincingly human in some cases, but these tools aim to provide a way of checking for it. We’ve investigated just how accurate they really are.

To do so, we used a selection of testing texts including fully ChatGPT-generated texts, mixed AI-and-human texts, fully human texts, and texts modified by paraphrasing tools. We ran all these texts through 10 different AI detectors to see how accurately each tool labelled them.

Our research indicates that if you’re willing to pay, the most accurate AI detector available right now is Winston AI, which identified 84% of our texts correctly. If you don’t want to pay, Sapling is the best choice: it’s totally free and has 68% accuracy, the highest score among free tools.

Best AI detectors in 2023
Tool Accuracy False positives Free? Star rating
1. Winston AI 84% 0 4.2
2. Originality.AI 76% 1 3.7
3. Sapling 68% 0 3.4
4. CopyLeaks 66% 0 3.3
5. ZeroGPT 64% 1 3.1
6. GPT-2 Output Detector 58% 0 2.9
7. CrossPlag 58% 0 2.9
8. GPTZero 52% 1 2.5
9. Writer 38% 0 1.9
10. AI Text Classifier (OpenAI) 38% 1 1.8
Note
To understand where these scores come from, you can read more about our methodology below. You may also be interested in our comparison of the best plagiarism checkers.

Continue reading: Best AI Detector | Free & Premium Tools Tested

Glossary of AI Terms | Acronyms & Terminology

Artificial intelligence (AI) is a hotly discussed topic right now – especially with the release of AI writing tools like ChatGPT. It’s a field that more and more people are interested in, but it involves a lot of terminology that can be intimidating to a non-expert.

To help you get to grips with various commonly used AI terms, we’ve prepared a glossary covering a wide variety of acronyms, technical language, and big names in the world of AI.

Check the table below for a quick definition of the term you’re interested in, and click on the term to navigate to a more in-depth explanation below.

Glossary of AI terms
Algorithm: A finite sequence of instructions followed by a computer system Alignment: The extent to which an AI’s goals are in line with its creators’ goals
AlphaGo: An AI system that plays Go Anthropomorphism: Attribution of human traits to non-human entities
Artificial general intelligence (AGI): AI that surpasses human intelligence Artificial intelligence (AI): Intelligence demonstrated by machines
AI detector: A tool designed to detect when a text was AI-generated AI safety: The study of how AI can be developed and used safely
AI writing: Use of AI technology to produce or edit text (e.g., chatbots, paraphrasing tools) Automation: Handling a process with machines or software so that less human input is needed
Autonomous: Able to perform tasks without human input Bard: A chatbot developed by Google, released in March 2023
Bias: The assumptions that an AI makes to simplify its tasks Big data: Very large datasets that normal data-processing software can’t handle
Bing Chat: A chatbot feature integrated into Bing, released in February 2023 Burstiness: A measurement of variation in sentence structure and length
CAPTCHA: A test used online to ensure that the user is human Chatbot: A software application that mimics human conversation, usually through text
ChatGPT: A chatbot released by OpenAI in November 2022 Chinese room: A philosophical thought experiment about AI
Computer: A machine that can automatically perform the tasks it is programmed for DALL-E: An AI image generator released by OpenAI in January 2021
Deep Blue: An AI system that plays chess Deepfake: AI-generated images and videos designed to look real
Deep learning: A form of machine learning based on neural networks ELIZA: An early chatbot developed in the 1960s
Emergent behaviour: Complex behaviour resulting from basic processes Generative AI: AI systems that generate output in response to prompts
Generative pre-trained transformer (GPT): A type of LLM used in ChatGPT and other AI applications Hallucination: Tendency of AI chatbots to confidently present false information
Large language model (LLM): A neural net trained on large amounts of text to imitate human language Machine learning (ML): The study of how AI acquires knowledge from training data
Machine translation: Use of software to translate text between languages Midjourney: An AI image generator released in July 2022
Natural language processing (NLP): The study of interaction between computers and human language Neural net(work): Computer systems designed to mimic brain structures
OpenAI: A leading AI company that developed ChatGPT and DALL-E Parameter: A variable in an AI system that it uses to make predictions
Paraphrasing tool: An AI writing tool that automatically rephrases the text you type into it Perplexity: A measure of how unpredictable a text is
Plagiarism: Unacknowledged use of the words or ideas of others Programming: The process of giving instructions to a computer (using computer code)
Prompt: The input from the user to which the AI system responds QuillBotA company offering a popular  paraphrasing tool and other AI writing tools
Reinforcement learning from human feedback (RLHF): Training method used to fine-tune GPT model responses Robot: Machine capable of carrying out physical actions automatically
Temperature: The level of randomness in an LLM’s output Training data: The dataset that was used to train an AI system
Token: The basic unit of text (a word or part of a word) processed by LLMs Turing test: A test of a machine’s ability to display human intelligence

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How Do AI Detectors Work? | Methods & Reliability

AI detectors (also called AI writing detectors or AI content detectors) are tools designed to detect when a text was partially or entirely generated by artificial intelligence (AI) tools such as ChatGPT.

AI detectors may be used to detect when a piece of writing is likely to have been generated by AI. This is useful, for example, to educators who want to check that their students are doing their own writing or moderators trying to remove fake product reviews and other spam content.

However, these tools are quite new and experimental, and they’re generally considered somewhat unreliable for now. Below, we explain how they work, how reliable they really are, and how they’re being used.

Note
Universities and other institutions are still developing their stances on how ChatGPT and similar tools may be used. Always follow your institution’s guidelines over any suggestions you read online. Check out our guide to current university policies on AI writing for more information.

You may also be interested in our research into the best AI detectors.

Continue reading: How Do AI Detectors Work? | Methods & Reliability

What Is ChatGPT? | Everything You Need to Know

ChatGPT is a chatbot powered by artificial intelligence (AI). It works like any chatbot: users type in text-based prompts, and it responds to them with its own text. What makes it unique is how fluent, extensive, and human-sounding its answers are, as well as the wide variety of topics it can discuss.

ChatGPT was developed by a company called OpenAI. It was released in November 2022. It’s currently free to use, although it was released as a “research preview”, so it may not be free forever.

It can be used for a wide variety of tasks, including writing, brainstorming, researching, coding, and feedbacking existing text. ChatGPT’s ability to quickly generate large amounts of convincing text has significant implications in a variety of areas, such as academia, business, politics, and the internet.

Note
Universities and other institutions are still developing their stances on how ChatGPT and similar tools may be used. Always follow your institution’s guidelines over any suggestions you read online. Check out our guide to current university policies on AI writing for more information.

Continue reading: What Is ChatGPT? | Everything You Need to Know

What Is a Plural Noun? | Examples, Rules & Exceptions

A plural noun is a noun that refers to more than one of something (as opposed to a singular noun, which refers to just one). Like singular nouns, they may refer to people, animals, things, concepts, or places.

Plural nouns are normally formed by adding -s to the singular noun (e.g., the singular “cat” becomes the plural “cats”). With certain nouns, you need to add or change some of the other letters. The rules are explained in the table below.

There are also some irregular plurals that don’t end in -s at all. The following section explains them.

How to form regular plural nouns
Word ending How to form the plural Examples
Add s to form most plurals that don’t fall into the categories below and to form the plurals of names. dog: dogs; house: houses; editor: editors; concept: concepts; Monday: Mondays; Kennedy: Kennedys
ch, sh, ss, x Add es. church: churches; wish: wishes; grass: grasses; tax: taxes
f, fe Often pluralised normally, but sometimes, the f or fe is replaced with ves. belief: beliefs; staff: staffs; safe: safes; wolf: wolves; life: lives
i Usually, pluralise normally. But es is occasionally used instead. bikini: bikinis; chili: chilies
o When preceded by another vowel, pluralise normally. When preceded by a consonant, usually add es. But some words are still pluralised normally. cuckoo: cuckoos; tomato: tomatoes; hero: heroes; piano: pianos; photo: photos
s, z Add es. Sometimes, the consonant is doubled (more often with z). gas: gases; waltz: waltzes; canvas: canvasses; quiz: quizzes
uy, y Replace y with ies, but only if it’s preceded by a consonant or by u. If preceded by a different vowel, pluralise normally. city: cities; baby: babies; spy: spies; soliloquy: soliloquies; day: days; ploy: ploys

Continue reading: What Is a Plural Noun? | Examples, Rules & Exceptions

Ending a Sentence with a Preposition | Examples & Tips

A preposition is a word such as “to”, “between”, “after”, or “for” that’s used to show the relationship between different elements in a sentence. They can express ideas related to time and location, as well as more abstract connections.

You may have been taught the rule that it’s wrong to end a sentence with a preposition, suggesting that it’s wrong to say, for example, “What are you preparing for?” and that you should say “For what are you preparing?” instead.

As you might guess from the fact that the “corrected” sentence reads much less naturally than the first, this “rule” is a superstition with no basis in reality. There is no problem with ending a sentence with a preposition, and it’s often better to do so than not.

Ending a Sentence with a Preposition

Continue reading: Ending a Sentence with a Preposition | Examples & Tips

When to Use Apostrophe S (‘s) | Guide & Examples

An apostrophe followed by an “s” is used in English to create possessive nouns. For example, the noun dog becomes dog’s when you refer to something belonging to the dog, such as “the dog’s ball.”

With plural nouns ending in “s,” you add the apostrophe after “s” and do not add an additional “s.” For example, the plural noun parents becomes parents’ (not “parent’s” or “parents’s”) in a phrase like “my parents’ car.”

An apostrophe can also be used to indicate a contraction (shortening of a word or phrase). So an apostrophe “s” may instead be short for the word “is” or “has,” as in “it’s” (“it is” or “it has”). In this context, it doesn’t indicate possession.

When to use apostrophe “s”

Continue reading: When to Use Apostrophe S (‘s) | Guide & Examples

Compound Words | Types, List & Definition

compound word (sometimes just called a compound) is a series of two or more words that collectively form a single word. There are three types of compound words, which differ in terms of how they are written:

Types of compound words

Tip
If you’re confused about how to write a particular compound word or about whether it qualifies as a compound at all, check out our articles on commonly confused words (e.g., “everyday” vs “every day”) and on common mistakes (e.g., “now a days” vs “nowadays”).

For any words and phrases that we don’t cover, it’s best to consult a reliable dictionary like Merriam-Webster.

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*Comprised Of | Meaning & Correct Usage

Comprise is a verb meaning “to be made up of”. Writing “comprised of” is a common mistake that confuses the meanings of comprise and compose (which means “to make up”).

It’s illogical to use “comprise” in the passive voice with the same meaning that it already expresses in the active voice – just like it wouldn’t make sense to write, for example, “is bought of” in place of “buys”.

The correct phrase is composed of. The phrase “is comprised of” can also be replaced with comprisesconsists of, or is made up of. All of these are valid alternatives; “comprised of” is never correct.

Examples: Replacing “comprised of”
  • A healthy lifestyle is comprised of regular exercise and a nutritious diet.
  • A healthy lifestyle is composed of regular exercise and a nutritious diet.
  • A healthy lifestyle comprises regular exercise and a nutritious diet.
  • A healthy lifestyle consists of regular exercise and a nutritious diet.
  • A healthy lifestyle is made up of regular exercise and a nutritious diet.

Continue reading: *Comprised Of | Meaning & Correct Usage

Comprised vs Composed | Difference & Examples

The related verbs comprise and compose, as well as their past tenses comprised and composed, are commonly confused:

  • Comprise means “to be made up of”. The whole of something comprises its parts.
  • Compose means “to make up”. The parts of something compose the whole.
  • The passive phrasing is composed of is correct and means the same thing as “comprises” on its own. The phrase “is comprised of” is a common mistake.
Examples: Comprise in a sentence Examples: Compose in a sentence
The university comprises a number of different campuses. The university is composed of a number of different campuses.
His education comprised deep study of Greek, Latin, philosophy, and mathematics. Many fresh ingredients compose this delicious sandwich.

Continue reading: Comprised vs Composed | Difference & Examples