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AI Letter Generator vs Grammarly

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors.

The short answer

Entry price
AI Letter Generator from $25 once, Grammarly from $12/mo — different billing units, so no direct winner
Free plan
Both have one
Higher Trust score
Grammarly — 94 vs 74 for AI Letter Generator
Best fit
AI Letter Generator: a single cover letter or formal letter without a subscription commitment · Grammarly: Anyone writing in a browser, Word or email who wants corrections in place
Platforms
AI Letter Generator: Web · Grammarly: Web, Chrome extension, Windows, macOS, iOS, Android

From our own records as of each tool's last check. Anything we have not confirmed is left out rather than guessed. How we verify

AI Letter GeneratorDrafts cover letters, business letters, and personal notes from a prompt, sold in prepaid packs rather than a subscription.GrammarlyGrammar, tone and rewriting help inside every app

Side by side

FactAI Letter GeneratorGrammarly
CategoryAI Writing AssistantsGrammar & Proofreading
Pricing modelFreemiumFreemium
Starts at$25 once$12/mo
Trust score74 / 10094 / 100
PlatformsWebWeb, Chrome extension, Windows, macOS, iOS, Android
Company—Superhuman
Launched—2009
Last verifiedOct 15, 2026Oct 16, 2026

What our research says

AI Letter Generator

Good for producing a clean first draft of a letter fast without signing up for a subscription. The catch is that pricing is per-use rather than flat, and there's no identifiable company behind it, which matters if you're paying for something you might want to dispute later.

Pros

  • produces a formatted, ready-to-send draft from a short prompt
  • covers several letter types beyond just cover letters
  • supports multiple languages
  • no subscription required, only pay for packs you use

Cons

  • per-use pricing gets expensive if you write letters often
  • no company name or address is published; the terms give only Hong Kong as the country
  • no visible way to save or version past drafts

Grammarly

Still the default for catching mistakes inside other people's software, but the free tier has quietly become an AI-prompt meter and the honest price is $30 unless you commit to a full year.

Pros

  • Runs inside the apps people already write in rather than as a separate editor
  • Free tier still covers spelling, grammar and tone detection with no time limit
  • Pro folds in plagiarism and AI-text detection that rivals charge for separately

Cons

  • The $12 headline is the annual rate; paying monthly costs $30
  • Free AI allowance is 100 prompts a month and depletes quickly
  • No public API, so it cannot be embedded in another product
  • Enterprise pricing is not published anywhere on the site

Which one fits

Choose AI Letter Generator if you need

  • a single cover letter or formal letter without a subscription commitment
  • drafting a letter in a language you don't write fluently
  • quick personal notes like thank-you letters

Choose Grammarly if you need

  • Anyone writing in a browser, Word or email who wants corrections in place
  • Teams enforcing a house style guide across people who are not writers
  • Non-native English speakers who want fluency rewrites, not just error flags

AI Letter Generator vs Grammarly: the questions people ask

Is AI Letter Generator cheaper than Grammarly?

They charge in different units, so there is no like-for-like answer: AI Letter Generator starts at $25 once, Grammarly at $12/mo. Entry price is the lowest paid plan as we last verified it.

Does AI Letter Generator or Grammarly have a free tier?

Both: AI Letter Generator has a free tier, and Grammarly has a free tier.

More comparisons

All AI Letter Generator alternatives →Browse all AI Writing Assistants →