Punctuation Rules

Binary Tuts

Contains ads

About this app

A complete, practical guide to English punctuation. Each rule is explained in plain language, with correct and incorrect example sentences, a tip and practice questions with answers.

What's inside
• Getting started: what punctuation does, and how the Chicago, AP, APA and British (Oxford) styles differ
• End marks: periods, question marks and exclamation points
• Commas: compound sentences, introductory elements, the serial (Oxford) comma, nonrestrictive elements, coordinate adjectives, direct address, dates, places, numbers and quotations
• Comma errors: comma splices, run-on sentences and commas that do not belong
• Semicolons and colons: joining clauses, complex lists, introducing lists and explanations, times, ratios and titles
• Apostrophes: possession, names ending in s, joint possession, contractions and plurals of letters and numbers
• Quotation marks: dialogue, American and British placement of periods and commas, single and double marks, titles
• Hyphens and dashes: compound modifiers, prefixes, numbers, the en dash and the em dash
• Parentheses, square brackets, ellipses and slashes
• Capitals and numbers: capitalization basics, title case and sentence case, numbers as words or numerals
• Review: a quick-reference table, ten common mistakes and four mixed quizzes

Where the style guides disagree, the app says so and shows each choice instead of picking one silently.

Who it is for
Students, English learners, teachers, writers and anyone who wants to write clear, correct English.

Features
• Works offline
• Explanations in 8 languages: English, Español, Português, Français, Deutsch, العربية, हिन्दी and Bahasa Indonesia (examples stay in English)
• Search every page
• Tap-to-reveal practice questions
• Clean design with dark mode

An independent study aid based on The Chicago Manual of Style, the AP Stylebook, the APA Publication Manual and Oxford's New Hart's Rules. Not affiliated with any of these publishers.

Ratings and reviews

Great app! I downloaded it because I've always struggled with commas, and I've been looking for simple, clear explanations on when and how to use them. This app gives great explanations and great examples. Awesome! Thank you :)

Basic but does exactly what you want it to do, very helpful.

One of the best punctuation app for every writer.

What’s new

Completely rewritten: a complete guide to English punctuation — end marks, every comma rule, semicolons and colons, apostrophes, quotation marks (US and UK), hyphens and dashes, brackets, ellipses, capitals and numbers — with correct and incorrect examples, style-guide differences and quizzes. Explanations now in 8 languages: English, Spanish, Portuguese, French, German, Arabic, Hindi and Indonesian.