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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. AI Letter Generator starts at $25, Grammarly at $12. Both have a free tier.

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 one_time$12 month
Public APINoNo
PlatformsWebWeb, Chrome Ext, Windows, macOS, iOS, Android
Company—Superhuman
Launched—2009
Last verifiedSep 1, 2026Sep 6, 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, address, or country is published anywhere on the site
  • 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

More comparisons

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