AI writing tools for checking, rewriting and counting
Pick the tool for the job. Each card says what the tool does and what you can use for free, with no account. The notes below the cards say which one fits which text.
Writing tools
- AI detectorMarks each sentence as AI-like or human-like and gives the whole text a range and a confidence rating.FreeUp to 250 words, 1 check a dayOpen tool
- AI humanizerRewrites stiff AI drafts into plainer prose and checks that numbers, names and quotations come through.FreeUp to 150 words, 1 run a dayOpen tool
- Grammar checkerFinds spelling, grammar and punctuation errors and lets you fix them one by one or all at once.FreeUnlimited, no account neededOpen tool
- SummarizerCuts a long text to a short, medium or long summary, or pulls out its key sentences.FreeUp to 250 words, 1 summary a dayOpen tool
- Paraphrasing toolSays the same thing in new words, in the mode you pick, from fluent to formal.FreeUp to 125 words, 1 run a dayOpen tool
- Word counterCounts words, characters, sentences and paragraphs as you type, with reading and speaking time.FreeUnlimited, counted in your browserOpen tool
- Character counterCounts characters with and without spaces against the limits of common forms and posts.FreeUnlimited, counted in your browserOpen tool
- Coming soonPlagiarism checkerFor finding which of your sentences already appear on public web pages, with a link to each source.FreePaid plans only, once it opensSee the page
For developers and AI agents
Use the same tools from your own code or from an AI agent.
Which tool for which job
Most writing tasks need one tool, sometimes two. Start from what you want to know about your text or what you want to change in it.
| You want to | Use | What you get |
|---|---|---|
| Know whether a text reads as machine-written | AI detector | A score from 0 to 100 with a range, a verdict, a confidence rating and a mark on every sentence |
| Turn a stiff AI draft into plainer prose | AI humanizer | A rewrite in one of four tabs, with names and numbers kept |
| Say the same thing in other words | Paraphrasing tool | A rewrite in one of eight modes, with up to 25 words you can freeze |
| Fix spelling and grammar mistakes | Grammar checker | Marked errors you accept one by one or all at once |
| Shorten a long text | Summarizer | A summary in the format and length you pick |
| Hit a word limit | Word counter | Words and sentences, plus reading and speaking time |
| Fit a post or caption | Character counter | Characters with and without spaces, and what is left for an X post or an Instagram caption |
| See whether sentences already appear on the web | Plagiarism checker | In preview and not open for checks yet |
Humanizer or paraphraser
The two look alike, and they solve different problems. The humanizer is for a draft that a language model wrote and that sounds like one. It rewrites the text into plainer prose, and on a paid plan you can add up to 400 characters of your own detail for it to work in. The paraphraser is for any text you want to restate, your own included. You pick a mode such as formal or shorten, choose how many synonyms it may use, and freeze the terms that must not change, like a product name or a legal phrase.
Neither tool promises that a text will pass an AI detector, and we do not test them for that. If your school or employer has rules on AI help, those rules decide what you may use.
What is free each day
The free tiers work without an account, and signing in does not change their limits. No card is needed.
| Tool | Free |
|---|---|
| AI detector | 1 check a day, up to 250 words |
| AI humanizer | 1 run a day, up to 150 words, Standard tab |
| Paraphrasing tool | 1 run a day, up to 125 words, Standard and Fluency modes |
| Summarizer | 1 run a day, up to 250 words |
| Grammar checker | Unlimited |
| Word counter and character counter | Unlimited, counted in your browser |
Each tool has its own daily count, so using the detector does not use up your summary. The counts reset at midnight UTC, and a run that fails does not count. The plagiarism checker, clarity suggestions in the grammar checker and batch detection are for paid plans only.
A typical order for a student essay
Here is how the tools fit together on a 2,000-word seminar paper. Count first with the word counter, since a limit set by your course is the one rule you cannot argue with. Run the grammar checker over the whole draft, which costs nothing however often you run it. Use the summarizer to test whether your abstract says what the paper says: if its summary of your text differs from your own, one of the two is unclear.
If a teacher uses AI detection, you can run your own text through the AI detector to see which sentences it marks. A score is a probability with a range, not proof of who wrote a text. Our accuracy page shows how often it flagged human writing in our tests, and how we test explains where those figures come from.
Text languages
Each tool reads the language from your text, and you can set it yourself. The detector is calibrated for 13 languages, among them all four languages of this site, and gives a text in any other language no score, only a note that the language is not calibrated. The paraphraser and summarizer take 15 languages and the humanizer 12. The grammar checker covers 10 languages and does not check Turkish.
When the free runs are not enough
Paid plans give each tool a monthly pool of words, from 50,000 detector words on Basic to 300,000 on Pro. One-off word packs work on a free account too. Prices and refund rules are on the pricing page. Pro also includes API access.