Grammarly vs WriteGo

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 $19.90/mo for WriteGo
Free plan: Both have one
Public API: WriteGo has one; not confirmed by us for Grammarly
Higher Trust score: Grammarly — 94 vs 69 for WriteGo
Best fit: Grammarly: Anyone writing in a browser, Word or email who wants corrections in place · WriteGo: Writing from a stack of PDFs where every claim needs a page citation

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

WriteGoAcademic writing workspace where quotes keep their page numbers from PDF reading through drafting to review

Side by side

Fact	Grammarly	WriteGo
Category	Grammar & Proofreading	AI Writing Assistants
Pricing model	Freemium	Freemium
Starts at	$12/mo	$19.90/mo
Public API	Not confirmed	Yes
Trust score	94 / 100	69 / 100
Platforms	Web, Chrome extension, Windows, macOS, iOS, Android	Web, API
Company	Superhuman	—
Launched	2009	—
Last verified	Oct 16, 2026	Oct 16, 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

WriteGo

The page-linked evidence chain is the reason to look at this over a generic writing assistant — quotes do not lose their provenance between reading and drafting, and the integrity pass quotes your draft rather than handing you a percentage. The awkward part is that the same product sells an AI detector and an AI humanizer, which are tools with opposite purposes, and the vendor behind it is nowhere named.

Pros

Verbatim quotes keep page numbers across ChatPDF, notes, drafting and review
Integrity Review quotes your own draft when flagging gaps instead of returning a bare score
Clear credit costs published per pack, from $0.023 down to $0.018 per credit
API access is included from the $19.90 Pro tier rather than reserved for enterprise

Cons

Sells an AI detector and an AI humanizer side by side, which cuts against the integrity framing
No company name, jurisdiction or team is published anywhere on the site
The 'unlimited' Premium and Lifetime tiers still carry an 800 credits/month ceiling

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 WriteGo if you need

Writing from a stack of PDFs where every claim needs a page citation
Checking a finished draft for unattributed passages before submission
High-volume detection or review work that needs API access