Comparison

Common Error vs Grammar AI Checker

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

Common Error

Features
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People with English as their second language make some very common mistakes while speaking or writing in English. The mistakes most of the times are grammar related, framing the questions in wrong manner or small preposition/articles mistakes. Some mistakes could be very embarrassing. With this app you can understand, learn & improve on those mistakes.

About

Grammar AI Checker

Features
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Grammar AI Checker – Correctify Fix grammar, paraphrase text, and write smarter with AI. (Some advanced features require an in-app purchase / Pro subscription.) Grammar AI Checker – Correctify is your intelligent writing assistant designed to improve English instantly. Whether you're proofreading essays, rephrasing sentences, or fixing grammar mistakes, Grammar-AI gives students, professionals, and writers the tools they need to write with clarity and confidence. Key Features AI Keyboard – Type smarter anywhere you write. (Certain advanced corrections require Pro.) AI Grammar Checker – Instantly detect and fix grammar, spelling, and punctuation errors. (Pro feature for full access.) Paraphrase Sentences & Paragraphs – Rephrase academic or professional writing without losing meaning. (Pro feature.) Smart Proofreader – Catch hidden issues, polish your text, and improve readability. (Pro feature.) AI Sentence Rewriter – Write better, clearer sentences for school, work, or personal use. (Pro feature.) Word & Character Counter – Stay on top of writing limits for essays and assignments. Built-in Dictionary – Learn word meanings and expand your vocabulary in real time. Text Expander & Shortener – Adjust text length for perfect structure and flow. (Pro feature.) Summary Generator – Condense long texts into short, clear overviews. (Pro feature.) Spell Checker & Editor – Eliminate typos and produce error-free writing. Text-to-Speech – Listen to your content to catch awkward wording. (Pro feature.) Email & Note Writer – Use AI to draft professional emails or organize your ideas. (Pro feature.) Color Scheme – Comfortable writing anytime, day or night. Work History & Export – Save, copy, and share your content whenever you need. (Export options may require Pro.) AI Keyboard Safari Extension – Work Smarter, Everywhere (Full features require Pro.) Boost your productivity beyond the app with our Safari Extension. Get real-time grammar checks, sentence rewrites, and proofreading tools directly inside your browser while you work on email, online forms, or documents. It’s like having an AI writing coach wherever you go. Why Choose Grammar AI? Unlike other grammar checkers, Correctify-AI gives you more value for your money. You’re not just paying for grammar fixesβ€”you’re getting an all-in-one writing assistant that: Works across apps, notes, essays, and the web (via Safari Extension). Offers faster, more accurate results than competitors. Combines grammar, paraphrasing, summarizing, and proofreading in a single tool. (Some tools require an in-app purchase.) Helps students, researchers, professionals, and writers save time and write with confidence. Built for Academic & Professional Use From essays, reports, and research papers to articles, summaries, and business emailsβ€”Correctify-AI Grammar Checker adapts to your writing needs, making it the perfect tool for both academic and professional success. Privacy Policy: https://sites.google.com/view/fluent-fix/privacy Terms of Use: https://sites.google.com/view/fluent-fix/term-of-use

Screenshots

Common Error4 screens
Grammar AI Checker4 screens

Verdict

The call

The clearest difference is in-app purchases: Common Error at none against Grammar AI Checker's 3. Common Error also leads on iOS requirement (7.0 vs 16.6). Grammar AI Checker's advantage is update cadence (every 5 days vs every 35 months). On price, ads and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Grammar AI Checker sells 3 in-app purchases, starting at $4.99 per 7 days. Common Error asks for nothing beyond the download.

UpkeepUpdate frequency

Common Error ships an update every 35 months, Grammar AI Checker every 5 days. The most recent releases landed on September 17, 2026 and September 21, 2026 respectively.

Scorecard3 real differences Β· 3 level
Common Error versus Grammar AI Checker: the parameters behind the verdict, then further details
ParameterCommon ErrorGrammar AI Checker
PriceFreeFree
Update frequencyEvery 35 monthsEvery 5 days β€” better
AdsNoNo
In-app purchasesNo β€” betterYes
DevicesiPhone, iPodiPhone, iPad, Mac β€” better
Requires iOS7.0 β€” better16.6
Further details β€” not scored
Size7 MB16 MB
Age rating4+4+
DeveloperLe Thi Quynh NyMuhammad Zubair

In-app purchases

None

Common Error

No in-app purchases

3 purchases

Grammar AI Checker

Subscriptions3
  • AI Grammar Checker Weekly$4.997 Days
  • AI Grammar Checker Monthly3 Days trial$6.991 Month
  • AI Grammar Checker Yearly$19.991 Year

Questions

Is Common Error free?
Common Error is free to download, with no in-app purchases.
Is Grammar AI Checker free?
Grammar AI Checker is free to download, with in-app purchases available.
Do Common Error or Grammar AI Checker have ads?
Neither Common Error nor Grammar AI Checker shows ads.
Which is updated more often, Common Error or Grammar AI Checker?
Common Error ships an update every 35 months, and Grammar AI Checker every 5 days. Most recently, Common Error was updated on September 17, 2026 and Grammar AI Checker on September 21, 2026.

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