11 of the Best Grammar and Writing Apps for High School Students

Writing well is a skill students build over time. Apps can speed up learning, catch mechanical errors, and suggest clearer phrasing — but they work best when paired with teacher feedback and practice. Below are 11 widely used grammar and writing tools, what they do, who they suit, their basic cost model, and quick tips so students, parents, and teachers can choose wisely.

How to pick the right app

Before choosing, consider purpose (practice vs. final proofreading), privacy (what happens to uploaded text), cost (free vs. subscription), and classroom compatibility. No app replaces instruction; use tools to reinforce lessons and to help students revise more effectively.

11 useful grammar and writing apps

1. Grammarly

What it does: Checks grammar, spelling, punctuation, and offers clarity and tone suggestions. Best for: Students who want a clear, easy-to-read explanation of errors and alternative wording. Cost: Free basic checks; premium adds advanced clarity, tone, and plagiarism tools. Tip: Teach students to review each suggestion and decide whether it fits their voice.

2. Hemingway Editor

What it does: Highlights long sentences, passive voice, adverbs, and readability level to encourage concise writing. Best for: Students learning to tighten sentences and improve readability. Cost: Free online; paid desktop app available. Tip: Use it after a draft to simplify sentences, but don’t remove all complexity if nuance is needed.

3. ProWritingAid

What it does: Offers grammar checks plus detailed style reports (repetition, pacing, transitions). Best for: Longer essays and revision-focused students who want more in-depth feedback. Cost: Free limited checks; premium adds integrations and full reports. Tip: Run the report to target one issue at a time (e.g., sentence length, transitions).

4. LanguageTool

What it does: Multilingual grammar and spellchecker that works in browsers and word processors. Best for: Multilingual learners and those writing in languages other than English. Cost: Free basic checks; premium for more suggestions and longer texts. Tip: Add custom words (names, project-specific terms) to avoid false positives.

5. Quill.org

What it does: Interactive activities and sentence editors that help students practice grammar and sentence combining. Best for: Skill-building and classroom practice rather than final proofreading. Cost: Many activities free; teacher features available. Tip: Use Quill for targeted practice when a student struggles with a particular grammar point.

6. Microsoft Editor

What it does: Grammar and style suggestions integrated into Microsoft Word and the browser extension. Best for: Students who use Office 365 and want checks inside Word and Outlook. Cost: Basic features free with a Microsoft account; more features with Microsoft 365 subscription. Tip: Use Editor in tandem with Word’s revision tools and track changes for teacher review.

7. Google Docs (built-in suggestions)

What it does: Spell and grammar suggestions plus collaborative comments and suggesting mode. Best for: Real-time collaboration, group projects, and teacher commenting. Cost: Free with a Google account; additional education features for schools. Tip: Encourage students to use Suggesting mode for peer edits so changes are transparent.

8. Ginger

What it does: Grammar and spell checking, sentence rephrasing, and translation features. Best for: English learners who benefit from rephrasing options and translations. Cost: Free basic tools; premium unlocks more features. Tip: Teach students to compare rephrased versions and choose the one that matches their intended meaning.

9. Read&Write (Texthelp)

What it does: Literacy support with text-to-speech, dictionaries, picture dictionaries, and study tools. Best for: Students with reading or writing difficulties and those who need accessibility supports. Cost: Often licensed by schools; individual options may exist. Tip: Check whether your school already provides a license before purchasing.

10. Slick Write

What it does: Fast online checker for grammar, potential stylistic issues, and sentence structure. Best for: Quick scans and students who want a lightweight tool for drafts. Cost: Free. Tip: Use Slick Write for an early draft scan, then follow up with a deeper tool or teacher review.

11. PaperRater

What it does: Grammar checking, writing suggestions, and basic automated feedback. Best for: Students who want a no-frills tool for proofreading and quick feedback. Cost: Free tier available; premium features for more checks. Tip: Don’t rely solely on automated feedback; use it alongside teacher comments and revision steps.

Using apps responsibly

Apps are helpful, but teach students to be critical users: review suggestions rather than accepting all changes, keep original drafts for learning, and respect privacy — avoid uploading personal or exam-protected work unless the tool and school policy allow it. Encourage students to combine automated checks with teacher feedback and peer review for the best learning outcome.

Conclusion: There’s no single perfect app for every task. Match the tool to the student’s needs — whether practice, drafting, collaboration, accessibility, or final polishing — and use these tools to build stronger habits, not as a shortcut around learning to write well.