Global availability — almost no hard blocks
Grammarly's BLOCKED_REGIONS is empty — no country is officially hard-blocked. Actual soft-limits: (1) mainland China — GFW sometimes DNS-poisons (about 30% of the time app.grammarly.com fails to resolve), VPN or DoH restores immediately; (2) Russia — post-2022 Grammarly cut off Russian paid payments (cards rejected), but free tier still works; (3) Iran/Cuba/North Korea/Syria — US OFAC sanctioned, payment limited, free web theoretically accessible; (4) enterprise SSO login needs IP from the company's registered country. Everyday use and Chrome/Safari/Firefox extensions have no region check.
Three integration platforms: browser extension + desktop app + mobile keyboard
Grammarly's real use isn't grammarly.com — it's integrated where you write: (1) browser extensions (Chrome/Edge/Firefox/Safari) — Gmail, Google Docs, Notion, Slack, Twitter/X, any rich-text field gets real-time checking; (2) desktop app (macOS/Windows) — taps system clipboard and text input, covers Word/Pages/Outlook/Slack desktop; (3) mobile keyboards (iOS/Android) — replaces native keyboard with real-time corrections on everything. All three share cloud account and settings. Google Docs integration is especially smooth — Grammarly doesn't sit in a sidebar, it underlines problem words inline with hover suggestions. Since 2023 Safari leans on macOS Ventura native Proofread but Grammarly is more complete.
GrammarlyGO — 2022 entry into generative AI
After ChatGPT's 2022 breakout, Grammarly launched GrammarlyGO, adding to the original 'check and correct' features: (1) Rewrite (one-click tone change — Professional/Friendly/Confident/Persuasive); (2) Compose (prompt → first draft, Reply → email response); (3) Ideate (brainstorm); (4) Summarize (shorten long text). Free tier gets 100 prompts/month, Premium 1000, Business 2000. GrammarlyGO routes through a mix of OpenAI + Anthropic + Google LLMs, not pinned to ChatGPT. Particularly useful for Chinese users — ChatGPT is messy to access in China but Grammarly's GrammarlyGO endpoint is nearly 100% available on Chinese IPs (Grammarly proxies LLM calls through its own US backend).
AF3 node strategy — any VPN works
AF3's Grammarly IP scoring: residential 30 / quality_vpn 30 / normal_vpn 28 / datacenter 27 — barely distinguishes IP type. Reason: Grammarly's abuse control watches 'account behavior' (spell-check API frequency), not IP. Any VPN node works: (1) ClashX combos (JP/US/HK/SG); (2) ChatGPT-dedicated nodes (usually also fine for Grammarly); (3) free proxies (Cloudflare WARP works); (4) corporate/school VPN. Only exception: enterprise SSO login needs an IP in the company's registered country. Personal Free/Premium accounts never check IP country.
Payment and cross-region subscription strategy
Grammarly Premium is $12/mo monthly, $144/yr annualized ($12/mo effective), $60/quarter ($20/mo effective). Expensive vs competitors — ProWritingAid $10/mo, LanguageTool €60/yr (~$5.4/mo). Student discount: SheerID .edu verification, Premium $10/mo (US/Canada/UK/Australia students only). Business $15/user/mo minimum 3 users, requires US business registration. Payment: Visa/MC/Amex/Discover/PayPal/Apple Pay/Google Pay, no obvious regional limits (besides OFAC countries). Cross-region savings: Grammarly uses USD pricing in most countries — no 'Argentina cheaper' arbitrage.