The Grammar Index

Grammar Index is a comprehensive English grammar reference for students, teachers, and lifelong learners — 270+ grammar topics, clear plain-English definitions, and up to ten worked examples for every entry. Built to look up an answer fast, then read deeper when you want to understand the rule. WHY GRAMMAR INDEX Most grammar apps either charge a recurring subscription, hide content behind ads, or rely on an internet connection that's not always there. Grammar Index is a one-time purchase, ad-free, and works entirely offline once activated — the full grammar database lives on your device. WHAT'S INSIDE Over 270 topics organised into six categories: • Parts of speech — nouns, verbs, adjectives, adverbs, pronouns, articles, conjunctions, prepositions, interjections, and more. • Verbal forms — gerunds, infinitives, participles, aspects, conditionals, and the full range of tenses. • Sentence structure — clauses, phrases, complements, subjects, objects, modifiers, and the building blocks of complex sentences. • Syntax rules — agreement, tense consistency, parallel structure, and the common error patterns that trip writers up. • Mechanics — capitalisation, abbreviations, contractions, prefixes, suffixes, and the morphology of English words. • Punctuation — every mark from the period to the interrobang, with British and American conventions explained side by side. WORKED EXAMPLES Each entry includes up to ten worked examples — including incorrect/correct pairs where the difference matters, and the occasional funny one to make the rule stick. So you don't just see the rule; you see how it actually plays out in real sentences. BUILT FOR LEARNERS Plain English explanations, no jargon. Clear definitions for ESL and EFL learners — concepts like the subjunctive mood, the perfect aspect, or the Oxford comma become approachable rather than intimidating. British and American conventions are distinguished where they differ. Instant search across all 270+ entries, with category filters to focus on what you need. KEY FEATURES • 270+ English grammar topics • Up to 10 worked examples per topic • Works fully offline once activated • Instant search and category filters • British and American conventions side by side • Plain-English explanations for ESL and EFL learners • No ads, no tracking, no analytics • One-time purchase — no subscriptions • Free content updates for the lifetime of your licence FOR SCHOOLS AND COLLEGES Schools, colleges, and universities can license Grammar Index for entire year groups at affordable per-seat pricing. One licence key works across all the devices a student uses — phone, tablet, and PC. IT administrators can deploy via Google Workspace, Microsoft Intune, or any standard Android MDM workflow. ACTIVATION Grammar Index requires a licence key purchased from grammarindex.com. Enter it on first launch to activate your device. Activation is one-time per device against your seat allowance; thereafter the app works entirely offline. PRIVACY Grammar Index does not collect personal data, run analytics, or show ads. The only data sent over the internet is your licence key and a hashed device fingerprint during the one-time activation. After activation, the app is fully offline. Published by Alderstrom Limited, London.