45:["$","title",null,{"children":"Plagx Preflight: Free Draft Checker & Grammar Suggestions | Plagiarism Checker X | Observable"}] 4d:T649,## How it works - **Length & structure:** word limits, long sentences, long paragraphs and required headings. - **References:** in-text citations with no reference-list entry, and references that are never cited (APA or MLA). - **Punctuation:** unmatched quotes and brackets, double spaces and spacing around punctuation. - **Basic grammar:** repeated words, *a* / *an*, sentence capitals and common word confusions. All results are automated suggestions. Preflight checks structure, references, punctuation and basic grammar. Originality and AI-generated text are checked in Plagiarism Checker X. Developer downloads: [npm](https://www.npmjs.com/package/plagx-preflight) · [jsDelivr](https://www.jsdelivr.com/package/npm/plagx-preflight) · [GitHub](https://github.com/plagiarismcheckerx/plagx-preflight) Need a quick citation online? Use the [free citation generator](https://plagiarismcheckerx.com/citation-generator?utm_source=plagx-preflight-observable&utm_medium=notebook&utm_campaign=plagx&utm_content=citation-generator). ## Plagx Preflight - Free Draft & Grammar Checker Developed by Plagiarism Checker X. Plagx Preflight gives writing suggestions; it does not detect plagiarism or AI-generated text. For full document checks, explore [Plagiarism Checker X](https://plagiarismcheckerx.com/?utm_source=plagx-preflight-observable&utm_medium=notebook&utm_campaign=plagx&utm_content=about-cta) and its [AI Content Detector](https://plagiarismcheckerx.com/ai-content-detector?utm_source=plagx-preflight-observable&utm_medium=notebook&utm_campaign=plagx&utm_content=about-ai-detector). MIT License 4e:[] 49:{"id":"b25e2130b2f8ea7b","slug":"plagx-preflight","title":"Plagx Preflight: Free Draft Checker & Grammar Suggestions","thumbnail":"e88569557fde78ceb7562c19f162359475f7d37f27d3b15c08a836f0afee88b1","access_level":"public","create_time":"$D2026-10-26T10:42:15.434Z","update_time":"$D2026-10-26T11:10:41.448Z","view_time":null,"first_public_time":"$D2026-10-26T11:11:36.408Z","has_unpublished_edits":null,"fork":false,"stars":0,"starred":false,"owner":{"type":"team","id":"6cfedbf882de3b46","login":"plagiarismcheckerx","name":"Plagiarism Checker X","avatar_url":"https://avatars-next.observableusercontent.com/aa8d50802b867de2cadbf254640df3a0d7946c5e5145397a9b7915f591712c1c","tier":"free_2026","bio":"","followed_by_you":false,"follows_you":false},"version":50,"publish_version":50,"role":null,"authored":false,"authors":[{"type":"individual","id":"f7f0ca0eabb2e157","login":"plagiarismcheckerx","name":"Plagiarism Checker X","avatar_url":"https://avatars-next.observableusercontent.com/aa8d50802b867de2cadbf254640df3a0d7946c5e5145397a9b7915f591712c1c","tier":null,"bio":"","followed_by_you":false,"follows_you":false}],"members":[{"type":"team","id":"6cfedbf882de3b46","login":"plagiarismcheckerx","name":"Plagiarism Checker X","avatar_url":"https://avatars-next.observableusercontent.com/aa8d50802b867de2cadbf254640df3a0d7946c5e5145397a9b7915f591712c1c","tier":"free_2026","role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"titling":"auto","title":"Plagx Preflight: Free Draft Checker & Grammar Suggestions","cells":[{"id":1,"value":"# Plagx Preflight: Free Draft Checker & Grammar Suggestions\n\n*A free academic writing tool by Plagiarism Checker X.*\n\nCheck an essay or paper before you submit: word count, structure, in-text citations against the reference list, punctuation and basic grammar. Everything runs in your browser using the open-source [plagx-preflight](https://www.npmjs.com/package/plagx-preflight) package, and your text stays on this page.\n\n**[Try the full live demo →](https://plagiarismcheckerx.github.io/plagx-preflight/)** · [Source code on GitHub](https://github.com/plagiarismcheckerx/plagx-preflight)\n","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":11,"value":"import * as preflight from \"npm:plagx-preflight@0.1.2\";","pinned":true,"hidden":false,"mode":"ts","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":3,"value":"const draft = view(Inputs.textarea({\n label: \"Your draft\",\n rows: 12,\n submit: \"Check draft\",\n value: `Introduction\n\nAcademic writing is is a skill that students develop over time (Smith, 2020). A good draft has a clear argument ,and each claim is supported by a source (Brown, 2018).\n\nMany students find that a early outline helps them plan there paper.\n\nReferences\n\nSmith, J. (2020). Writing for university. Academic Press.\nLee, K. (2019). Planning essays. Study Skills Journal, 4(2), 10-18.`\n}));\n","pinned":true,"hidden":false,"mode":"ts","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":4,"value":"const options = view(Inputs.form({\n minWords: Inputs.number({label: \"Min words\", value: 0, min: 0, step: 50}),\n maxWords: Inputs.number({label: \"Max words\", value: 0, min: 0, step: 50}),\n style: Inputs.radio(new Map([[\"APA\", \"apa\"], [\"MLA\", \"mla\"]]), {label: \"Citations\", value: \"apa\"}),\n checks: Inputs.checkbox(preflight.CHECKS, {label: \"Checks\", value: preflight.DEFAULT_CHECKS})\n}));\n","pinned":true,"hidden":false,"mode":"ts","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":5,"value":"const result = preflight.checkDraft(draft, {\n minWords: options.minWords || undefined,\n maxWords: options.maxWords || undefined,\n style: options.style,\n checks: options.checks\n});\ndisplay(html`

\n ${result.stats.words} words · ${result.stats.sentences} sentences ·\n ${result.stats.paragraphs} paragraphs · ${result.stats.readingTimeMinutes} min read ·\n Flesch reading ease ${result.stats.fleschReadingEase}
\n ${result.errors} errors · ${result.warnings} warnings · ${result.infos} suggestions\n

${parts}

`);\n","pinned":true,"hidden":false,"mode":"ts","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":9,"value":"display(Inputs.table(result.issues, {\n columns: [\"level\", \"code\", \"line\", \"text\", \"message\"],\n header: {level: \"Level\", code: \"Check\", line: \"Line\", text: \"Text\", message: \"Suggestion\"},\n width: {message: 360}\n}));\n","pinned":true,"hidden":false,"mode":"ts","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":10,"value":"$4d","pinned":true,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"}],"files":"$W4e","stdlib":"2"}} 44:null