Grammarly

Grammarly is a household name in the writing-tools category, and it has run one of the longest-standing, highest-converting affiliate programs in the education and productivity space. If your audience writes—students, professionals, marketers, or non-native English speakers—Grammarly is a near-universal recommendation that converts well thanks to its generous free tier.

About Grammarly

Grammarly is an AI writing assistant that helps people write clearly, correctly, and confidently. It checks grammar and spelling, suggests tone and clarity improvements, rewrites full sentences, detects plagiarism and AI-generated text, and generates content with AI prompts. The company reports it is trusted by over 40 million people and 50,000 organizations.

The product is available across surfaces—browser extensions (Chrome, Safari, Firefox, Edge), desktop apps for Windows and Mac, mobile keyboards for iOS and Android, and integrations with tools like Google Docs and Microsoft Office. Grammarly's pricing is straightforward: a Free plan at $0, a Pro plan at $12 USD per member/month billed annually (about $144/year, or $30 when billed monthly), and an Enterprise plan available through Superhuman Go via Contact Sales.

How the Grammarly affiliate program works

Grammarly's affiliate program is structured around a two-way commission model, which is unusual and worth understanding:

• $0.20 per free registration — you earn a small commission whenever a referred user creates a free account, with no payment information required.
• Up to $20 per premium upgrade — when a referred user upgrades to a paid plan, you earn the larger payout.

Third-party directories describe the range as $0.20 to $20 per lead depending on the action. The program advertises high conversion rates (20–30%), an activation bonus, cross-device tracking, and an extra-generous 90-day cookie window—far longer than the typical 30 or 45 days. Grammarly also notes a separate Grammarly Business Affiliate program with its own qualified-action types, including a self-serve purchase action.

Commissions are one-time per action rather than recurring on subscription renewals. Some directory listings reference monthly PayPal payouts, but the exact payment threshold and schedule are governed by the affiliate network Grammarly uses and its terms of service. To join, visit the Grammarly affiliates page and click "Become an affiliate"—the program advertises sign-up in under 60 seconds. After joining, you place a banner and write a post to receive the activation bonus, then start earning. Questions can go to the affiliates FAQ, the terms and conditions page, or affiliate_mktg@grammarly.com.

Who should promote Grammarly

Grammarly is a strong fit for a wide range of publishers because writing help is close to universally useful. Consider promoting it if you run:

• Education and student-focused content — essay help, study resources, and academic writing guides.
• Blogging, freelancing, and productivity sites — where writing quality is a core topic.
• ESL and language-learning audiences — Grammarly's clarity and fluency features resonate strongly.
• SaaS and tool review sites — Grammarly is a standard "best writing tools" inclusion.

Because the free plan is genuinely useful and requires no payment info, even audiences who won't buy immediately can generate the $0.20 registration commission, and the 90-day cookie gives ample time for those users to upgrade to a paid plan later.

Pros and cons

Pros

• Extremely well-known brand with high trust and strong conversion (reported 20–30%).
• 90-day cookie window—much longer than most programs.
• Two ways to earn: paid on free sign-ups ($0.20) and on premium upgrades (up to $20).
• Activation bonus plus regular performance incentives and cash bonuses for top performers.
• Cross-device tracking and a publisher-friendly keyword bidding policy.
• Fast approval and sign-up in under 60 seconds.

Cons

• One-time commissions—no recurring revenue on subscription renewals despite Grammarly being a recurring-revenue product.
• Low free-registration payout ($0.20) means volume matters; meaningful income depends on driving premium upgrades.
• Fixed $20 cap per premium upgrade rather than a percentage of the (higher) annual plan value.
• Payout thresholds and schedule aren't clearly published on the brand page and depend on the network's terms.

Overall, Grammarly is a reliable, easy-to-recommend program with an excellent cookie window and a low-friction free offer. It works best as a volume play: the strongest affiliates pair broad top-of-funnel content with clear calls to upgrade, capturing both the small free-registration payouts and the larger premium-upgrade commissions. If recurring commissions are a must for your business model, note that Grammarly pays per action rather than on renewals.