App Overview

Complete English Grammar Rules icon

Complete English Grammar Rules

Farlex, Inc. · Reference

The most complete English grammar app, from the language experts at the hugely popular TheFreeDictionary.com

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.6
44 ratings · Top 15%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

Build your own version

Build Kit

Make this idea yours

A product spec, screen plans, and build steps for your coding agent.

First kit free with a verified email

Add to a Remix

Combine features and design from your favorite apps.

Kit ready. Verify your email to download it.

What's included16 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
Preview a sample Build Kit No email needed

Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

JavaScript is required to complete mailbox verification.

Free quick prompt For a smaller starting point

Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Complete English Grammar Rules: map the core Reference workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

Preview ready. Verify your email to reveal and copy the full prompt.

JavaScript is required to complete mailbox verification. Return to this prompt preview.

Continue in Rork copies the full prompt to your clipboard first, then opens Rork in a new tab.

Continue in Rork >

Affiliate link: CloneChart may earn a commission at no extra cost

Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Add quizzes and interactive examples to enhance learning.

Assumption to check: Limited interactivity with grammar rules

Validate with people who use this workflow before building.

Hypothesis 2

Implement better categorization and search functionality.

Assumption to check: Difficult navigation through extensive content

Validate with people who use this workflow before building.

Hypothesis 3

Introduce user profiles to track progress and suggest content.

Assumption to check: Lack of personalized learning paths

Validate with people who use this workflow before building.

Hypothesis 4

Regularly update content to reflect modern usage and grammar changes.

Assumption to check: Infrequent updates on grammar rules

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

The most complete English grammar app, from the language experts at the hugely popular TheFreeDictionary.com. * 100% offline and ad-free. * 175+ lessons and quizzes included. Nothing else to buy! Don't be fooled by trial apps that require hundreds of in-app purchases. Get all the rules of proper English grammar, explained in simple, easy-to-understand terms, all with one purchase. Only Complete English Grammar Rules gives you: * Thousands of real-world example sentences. * Common grammar mistakes. * Key exceptions. * 175+ interactive grammar quizzes designed to help you retain what you've learned. Whether you're an expert or a beginner, there's always something new to learn. With Complete English Grammar Rules, you'll be able to: * Quickly master basic English grammar and tackle more advanced topics. * Properly use every type of noun, verb, and all the parts of speech, including pronouns, adverbs, adjectives, prepositions, and more. * Master verb tenses, including irregular verbs and exceptions. * Learn every type of sentence. * Avoid embarrassing grammar errors. * Immediately put your new skills into action! Become a more effective writer and communicator in school, at work, and in everyday conversation. Finally, you can get answers to all your grammar questions in one easy-to-use grammar app. How do we do it? TheFreeDictionary.com - Farlex apps have been downloaded tens of millions times across multiple platforms, with top ratings after hundreds of thousands of user reviews. We work with the best publishers to bring together trusted content in the most comprehensive, authoritative reference apps on the market. Our flagship app is The Free Dictionary (TFD). Find our other apps by searching "Dictionary by Farlex" in the App Store.

Written user reviews are not shown here. Check current App Store reviews >

Screenshots

< Scroll to see more >

Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
@react-navigation/native
expo
@supabase/supabase-js
axios
react-query
zustand
BUILD KIT DIFFICULTY
Starter

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.