The Grammar Index comes in four editions, each built for a different learner. Every one of them runs on the web, Windows, iPhone, iPad and Android — and a single licence key unlocks all four.
The original grammar reference
For schools, colleges, universities, and anyone who writes in English.
A guided course in 34 languages
For learners of English as a second language, and GCSE, IELTS and TOEFL revision.
Grammar for ages 7-13
For primary and lower-secondary pupils, their teachers and their parents.
Grammar for US elementary and middle school
For students in Grades 3 to 8, their teachers and their parents — in American English.
Everything each edition includes, on every platform it runs on.
| Feature | English |
International |
Key Stage 2 & 3 |
Grade 3 to 8 |
|---|---|---|---|---|
| Who it is for | ||||
| Audience | Schools, colleges, universities, writers | ESL / EFL learners; GCSE, IELTS and TOEFL candidates | Pupils aged 7-13 (Key Stages 2 and 3) | US students in Grades 3 to 8 (elementary and middle school) |
| Web address | web.grammarindex.com | learning.grammarindex.com | keystage.grammarindex.com | grade.grammarindex.com |
| Content | ||||
| Grammar topics | 314 topics in eight sections | 314 topics in eight sections | 95 topics in eight sections, written for ages 7-13 | 124 topics in eight sections, written for Grades 3 to 8 |
| Worked examples | Up to ten per topic — over 3,100 in all | Up to ten per topic, grouped into correct, with mistakes, and more | Three right examples with the key word underlined, plus one wrong example explained | Three right examples with the key word underlined, plus one wrong example explained — 620 in all |
| Grammar jokes | On many topics | On many topics | One on every card | One on every card |
| Curriculum alignment | Not included | Not included | UK National Curriculum English programme of study (DfE glossary) | US English Language Arts curriculum for Grades 3 to 8, in American spelling, vocabulary and punctuation |
| Interface language | English | 34 languages | English | English (US) |
| Definitions translated | Not included | 34 languages — the examples stay in English, with the original shown on request | Not included | Not included |
| Learning tools | ||||
| Search and section filter | Included | Included | Included | Included |
| Custom topic list (teacher-curated, saved per device) | Included | Included | Included | Included |
| Five-question quiz from the topics you have opened | Included | Included | Included | Included |
| Learning path | Not included | Eight levels, beginner to advanced | Five parts of the curriculum, each ending in an exercise | Five stages of the English Language Arts curriculum, each ending in an exercise |
| Daily spaced-repetition drills | Not included | Included | Not included | Not included |
| Today dashboard and daily streak | Not included | Streak and a study tip | Streak, points and badges | Streak, points and badges |
| Marked exercises with automatic retests | Not included | Not included | Ten questions per part; a retest in a few weeks if it went well, a couple of days if not† | Ten questions per stage; a retest in a few weeks if it went well, a couple of days if not |
| Jobs list and exercise record | Not included | Not included | Wrong answers become a jobs list; the record tracks first, latest and best score and can be saved to a file† | Wrong answers become a Todo list; the record tracks first, latest and best score and can be saved to a file |
| Spelling test | Not included | Not included | 1,000 curriculum spelling words, 20 per round | 996 grade-level words in American spelling (Grades 3-5 and 6-8 lists), 20 per round |
| How-to tour films | Not included | Not included | Included | Not included |
| Listening and accessibility | ||||
| Read-aloud narrator (professionally voiced, in English) | Title, definition and every example† | Title, definition and every example | Everything — including the jokes, study tips and spelling words | Titles, definitions, examples, tips and spelling words — the same narrator wherever the wording matches the Key Stage 2 & 3 edition, the device's own voice for the rest |
| Reading speed (0.75×, 1×, 1.25×) | Included | Included | Included | Included |
| Easy-read font, colour tints and reduce-motion | Not included | Not included | Included | Included |
| Focus mode and focus timer | Not included | Not included | Included | Included |
| Platforms | ||||
| Web, in any modern browser | Included | Included | Included | Included |
| Windows app (Microsoft Store) | Included | Included | Included | Included‡ |
| iPhone and iPad (App Store) | Included | Included | Included | Included‡ |
| Android (Google Play) | Included | Included | Included | Included‡ |
| Works offline | The apps, once activated | The apps, once activated | The apps, once activated | The apps, once activated |
| Free preview | 10 topics at trial.grammarindex.com, and in every app | Preview mode in the Windows, iOS and Android apps | Preview topics and a 20-word spelling sample | 10 preview topics and a spelling sample |
| Licence | ||||
| Unlocked by | Any Grammar Index licence — a key is not tied to one edition, so one Individual licence covers a family and one school licence covers every pupil. | |||
| Devices per seat | Two, in any combination of web, Windows, iPhone, iPad and Android. | |||
| Payment | One-time. No subscription, no renewals, and content updates are free for the life of the licence. | |||
| Pupil data collected | None | None | None — no pupil accounts; scores and progress stay on the device | None — no student accounts; scores and progress stay on the device |
† New in the September 2026 update. Already on the web and Windows; the iPhone, iPad and Android versions follow as the App Store and Google Play complete their review.
‡ The Grade 3 to 8 edition is new in September 2026. Its Windows, iPhone, iPad and Android apps are with the Microsoft Store, the App Store and Google Play for review, and the badges above link to each listing as it goes live.
The English edition for older students and staff, and the Key Stage 2 & 3 edition (or, in the United States, the Grade 3 to 8 edition) for younger pupils. One Team, Institution or Gift licence covers every edition, so a school does not have to choose.
The Grade 3 to 8 edition. The same child-friendly design as Key Stage 2 & 3, rewritten for the English Language Arts curriculum in American spelling and usage, with graded exercises, a Todo list and a spelling test of grade-level words.
The International edition. Read the explanation in your own language, work through the learning path and drills, and hear every example in English.
The Key Stage 2 & 3 edition. It follows the curriculum your child is taught, marks its own exercises, and tells them what to read again. A single Individual licence covers the family.
The English edition. A reference first: search it, filter it, and keep the topics you use most in a Custom list.
Pay once, use all four editions on up to two devices per seat.