Grammarly vs HyperWrite

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

Cheaper paid plan: Grammarly — $12/mo vs $16/mo for HyperWrite
Free plan: Both have one
Best fit: Grammarly: Anyone writing in a browser, Word or email who wants corrections in place · HyperWrite: People who draft mostly in Gmail or Google Docs and want suggestions in place
Platforms: Grammarly: Web, Chrome extension, Windows, macOS, iOS, Android · HyperWrite: Web, Chrome extension
Trust score: About even — Grammarly 91, HyperWrite 91

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

GrammarlyGrammar, tone and rewriting help inside every app

HyperWriteWriting assistant with autocomplete in the browser, cited research and saved custom tools

Side by side

Fact	Grammarly	HyperWrite
Category	Grammar & Proofreading	AI Writing Assistants
Pricing model	Freemium	Freemium
Starts at	$12/mo	$16/mo
Trust score	91 / 100	91 / 100
Platforms	Web, Chrome extension, Windows, macOS, iOS, Android	Web, Chrome extension
Company	Superhuman	OthersideAI, Inc.
Launched	2009	—
Last verified	Sep 6, 2026	Sep 6, 2026

What our research says

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

HyperWrite

HyperWrite's useful part is the extension: autocomplete that follows you into Gmail and Google Docs, and a shelf of saved prompt tools you can trigger without opening a chat window. The web app is a competent but ordinary chat-plus-tools workspace in a market where Claude, ChatGPT and Gemini all now write and cite, so the question is whether the 250-message Premium quota and the in-browser convenience are worth $16 to $20 a month to you. The agent that once headlined the product survives only as an 'early access' line on the Ultra plan.

Pros

Chrome extension brings autocomplete and tools into Gmail, Google Docs and most text fields
Research mode returns citations from web and scholarly sources rather than unsourced prose
Custom tools and personas let you package a repeatable prompt once and reuse it
Annual billing cuts Premium to $16 a month, with a free tier to try first

Cons

250 AI messages a month on Premium is low for anyone using it as a daily chat assistant
The free plan's limits are not stated beyond 'limited monthly credits'
The browsing agent is no longer a shipped feature, only early access on Ultra
No legal entity, address or country on the site beyond the OthersideAI brand name

Which one fits

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

Choose HyperWrite if you need

People who draft mostly in Gmail or Google Docs and want suggestions in place
Students and researchers who want cited sources attached to drafts
Anyone who repeats the same prompt jobs and wants them saved as one-click tools