PromGee vs Grammarly: Grammar Practice or Writing Assistant?

People often search for “PromGee vs Grammarly” because both involve English grammar and AI. The overlap is smaller than it looks. Grammarly works on the text you are writing right now. PromGee trains the rules behind that text, so you make fewer mistakes before any checker sees them. The table below summarizes the differences, using Grammarly's official plan and support pages as sources.

PromGee and Grammarly at a glance

Is PromGee a replacement for Grammarly?

No. PromGee does not sit inside your email, documents or browser and correct what you type. If you need a tool that underlines mistakes in a work email or a Google Doc as you write, Grammarly is built for that, and its plans page lists apps for Windows, Mac, browsers, iPhone, iPad, Android, Microsoft Office and Google Docs. PromGee's closest equivalent is its free English grammar checker and sentence corrector, where you paste text into a web page. Those are useful for a quick check, but they are not a real-time assistant across apps.

Which is better for learning grammar rules?

If your goal is to learn the rule rather than fix one sentence, PromGee is designed for that job. You pick a category, answer quiz questions, and read an AI explanation of why each answer is right or wrong. The desktop app has 14 learning categories: Prepositions, Grammar, Vowels, Tenses, Articles, Punctuation, Spellings, Collocations, Verb Forms, Phrasal Verbs, Core Skill Building, Idioms, Vocabulary, Pronunciation. Explanations are available in 40+ languages, which helps when a rule is hard to follow in English.

Grammarly also teaches indirectly: each suggestion shows what changed. But its focus is the document in front of you, not a structured set of exercises on, say, articles or verb tenses. Note that PromGee does not use spaced repetition; you choose what to practice and when.

How do the costs compare over time?

PromGee is a one-time purchase of $25 USD for a lifetime license, with no PromGee subscription. The license does not include an unlimited AI quota: AI usage depends on the provider's limits, and if you bring your own API key, that provider's pricing applies. See the pricing page for details.

Grammarly has a free plan with spelling and grammar checks, tone detection and 100 AI prompts per month. Grammarly Pro is a subscription. Its support center lists $30 per member per month, $60 per member for three months, or $144 per member per year (about $12 a month), and states that Grammarly does not offer lifetime or one-time plans. The plans page also mentions a 7-day free trial of Pro.

What does Grammarly do better?

• Real-time checking inside the apps where you already write, on desktop and mobile.
• Rewrites and tone adjustments for finished text, plus plagiarism and AI-text detection on Pro.
• A free plan that covers basic spelling and grammar checks.
• Team and Enterprise features such as SAML single sign-on and admin controls.

Where does PromGee fit better?

• Structured grammar practice by category, with an explanation for every answer.
• Explanations in 40+ languages for learners who think in another language first.
• A one-time payment instead of a recurring subscription.
• Learning progress and settings stored locally on your Windows PC, with no account required.

Who should choose which?

Choose Grammarly if you mainly need your emails, documents and messages checked while you write, on several devices, or if your team needs shared controls.

Choose PromGee if you are learning English and want to practice specific grammar areas on a Windows PC, understand why answers are right, and prefer paying once.

Use both if you write in English every day and also want to improve: let a writing assistant catch mistakes in real time, and use practice sessions to fix the patterns behind them. You can try PromGee's verb tenses quiz or articles quiz in the browser for free.