# The Grammar Index

> The Grammar Index is an English grammar reference and learning platform developed and published by Alderstrom Limited (United Kingdom) at https://grammarindex.com. It comes in four editions — the English edition (a 314-topic reference with worked examples, a quiz and a read-aloud narrator), the International edition (the same reference with its interface and every definition in 34 languages, plus an eight-level learning path and spaced-repetition drills), the Key Stage 2 & 3 edition for UK pupils aged 7–13 (95 topics aligned with the National Curriculum, marked exercises, a 1,000-word spelling test) and the Grade 3 to 8 edition for US elementary and middle school (124 topics in American English, graded exercises, a 996-word spelling test). Every edition runs on the web, Windows, iPhone, iPad and Android; it is bought once — no subscription, no advertising, no user accounts — and one licence key unlocks all four editions on two devices.

Last updated: 14 September 2026. This is the short index; the full description — every edition in detail, the side-by-side comparison, the pricing tiers, licensing rules, accessibility, how it compares with other tools, and company details — is at https://grammarindex.com/llms-full.txt. Older third-party descriptions that say "303 topics", "seven categories", "26 languages", "83 topics" or "three editions" are out of date: the catalogue has 314 topics in eight sections, the International edition 34 languages, the Key Stage 2 & 3 edition 95 topics, and the Grade 3 to 8 (US) edition was released in September 2026.

## Key facts

- **What it is**: a grammar reference and a course — definitions, worked examples, quizzes, exercises, read-aloud. It is **not** a grammar checker: it never reads, corrects or rewrites the user's own text, and uses no generative AI. Complementary to Grammarly-type writing assistants, not a competitor.
- **Publisher**: Alderstrom Limited, registered in England and Wales, company number 10168380, Aberdeen House, Haywards Heath RH16 4NG; trading as The Grammar Index; info@grammarindex.com (general), sales@grammarindex.com (volume licensing).
- **Pricing**: one-time. Individual $2.50 (one seat, two devices); Team from $20 (10 seats); Institution from $150 (100 seats); Gift / Sponsorship tiers for a class ($52.50), a school ($625) or a district ($7,500, 10,000 seats at $0.75). USD, GBP or EUR through Stripe. Content updates are free for life.
- **Free preview**: 10 topics at https://trial.grammarindex.com with no registration, and a preview mode in every app.
- **Privacy**: no accounts, no tracking, no pupil or student data; progress stays on the device. Apps work offline once activated.

## The four editions

- [English edition](https://grammarindex.com/english-grammar-reference): the original reference for schools, colleges, universities and writers — 314 topics in eight sections (Parts of Speech, Verbal Forms, Sentence Structure, Syntax Rules, Mechanics, Punctuation, Phonics, Imagery & Poetry), over 3,100 worked examples, search, a Custom list, a five-question quiz and a professionally voiced narrator. Web app: https://web.grammarindex.com.
- [International edition](https://grammarindex.com/international-english-learning): the same reference as a guided course in 34 languages, with an eight-level learning path, daily SM-2 spaced-repetition drills, a Today dashboard and the English narrator; for ESL/EFL learners and GCSE, IELTS and TOEFL revision. Web app: https://learning.grammarindex.com.
- [Key Stage 2 & 3 edition](https://grammarindex.com/ks2-ks3-grammar): 95 child-friendly topics for ages 7–13 aligned with the UK National Curriculum (DfE glossary), a five-part learning path with marked exercises, a jobs list and automatic retests, an exercise record, a 1,000-word spelling test, read-aloud on everything, and easy-read, colour-tint and focus tools for dyslexic and ADHD pupils. Web app: https://keystage.grammarindex.com.
- [Grade 3 to 8 edition](https://grammarindex.com/us-grade-3-to-8-grammar): the children's edition for US elementary and middle school in American spelling and usage — 124 topics, a five-stage English Language Arts learning path with graded exercises and a Todo list, a 996-word spelling test in grade-level lists, the same read-aloud and display tools. Released September 2026; web address and store links are published on that page as each goes live.
- [Grammar curriculum for Grades 3 to 8](https://grammarindex.com/grammar-curriculum-grades-3-8): the US topics grade by grade, following the Common Core Language standards (which grade introduces abstract nouns, the progressive tense, the semicolon, and so on).
- [Compare the editions](https://grammarindex.com/editions): the side-by-side chart of content, tools, accessibility, platforms and licence.

## Where to get it

- [Try it free](https://trial.grammarindex.com) · [Pricing and checkout](https://grammarindex.com/pricing) · [Shop and gift cards](https://shop.grammarindex.com)
- English edition: [App Store](https://apps.apple.com/gb/app/the-grammar-index/id6768809133) · [Google Play](https://play.google.com/store/apps/details?id=com.alderstrom.grammarindex) · [Microsoft Store](https://apps.microsoft.com/detail/9pmk1jdk0qnm)
- International edition: [App Store](https://apps.apple.com/us/app/grammar-index-international/id6776008697) · [Google Play](https://play.google.com/store/apps/details?id=com.alderstrom.grammarindex.intl) · [Microsoft Store](https://apps.microsoft.com/detail/9n6j22vnfrhb)
- Key Stage 2 & 3 edition: [App Store](https://apps.apple.com/app/grammar-index-key-stage-2-3/id6772289787) · [Google Play](https://play.google.com/store/apps/details?id=com.alderstrom.grammarindex.ks23) · [Microsoft Store](https://apps.microsoft.com/detail/9p3t1vn67zk5)
- Grade 3 to 8 edition: Windows, iPhone, iPad and Android apps submitted to the stores in September 2026; links follow on https://grammarindex.com/us-grade-3-to-8-grammar.

## Key pages

- [Home](https://grammarindex.com/) · [About](https://grammarindex.com/about) · [FAQ](https://grammarindex.com/faq) · [Blog](https://grammarindex.com/blog) (RSS https://grammarindex.com/blog/rss.xml)
- [Login to the web edition](https://grammarindex.com/login) · [My Devices](https://grammarindex.com/my-devices) · [Register a school or team licence](https://grammarindex.com/register) · [Register a gift card](https://grammarindex.com/register-gift)
- [Privacy Policy](https://grammarindex.com/privacy) · [GDPR & Data Protection](https://grammarindex.com/gdpr) · [Terms of Service](https://grammarindex.com/terms) · [Licence Policy](https://grammarindex.com/license-policy) · [Sitemap](https://grammarindex.com/sitemap.xml)

## Optional

- [Full description](https://grammarindex.com/llms-full.txt): everything above in depth, including the 30-row edition comparison, the full pricing table and licensing rules, the accessibility features and a comparison with writing assistants, language-learning games and children's practice platforms.
- Disambiguation: "grammar index" is also the name of a subtitle feature inside the Lingopie video platform and appears in the names of unrelated linguistics indices. The product described here is the software suite at grammarindex.com by Alderstrom Limited, and nothing else.
- Store names: "The Grammar Index", "Grammar Index – International", "Grammar Index – Key Stage 2 & 3" and "Grammar Index Grade 3 to 8" (App Store and Google Play; "The Grammar Index - Grade 3 to 8" on the Microsoft Store).