H
HReadability editor that flags wordy, unclear writing and offers AI fixes
From $8.33/mo
Grammarly vs Spinbot
Pricing, features, platforms and who each one suits — side by side.
G
Choose Grammarly if…
- you work on Windows, macOS, iOS
- you're in its core audience: students, professionals
S
Choose Spinbot if…
- you're in its core audience: students, bloggers
Side by side
Feature Grammarly Spinbot
Pricing modelFreemiumFree
Starting price—Free
Free plan
Free trial
API
Open source
Trains AI on your contentYes, unless you opt out—
Data retentionSaved documents kept until you delete them or your account—
Security and complianceSOC 2 Type II—
AI rewrites—
Plagiarism checker—
AI text detection—
Non-English checking—
Word/Google Docs add-in—
Browser extension—
Custom style guide—
PlatformsWeb, Windows, macOS, iOS, Android, ChromeWeb
CategoryGrammar & ProofreadingParaphrasing & Rewriting
CompanySuperhuman Platform Inc.—
Based inUnited States—
Founded2009—
Part ofSuperhuman—
Key features
G Grammarly
- Real-time spelling, grammar and clarity checks
- Paragraph and full-sentence rewrites
- Tone suggestions for different audiences
- Reader Reactions predicts how readers respond
- AI Detector and Humanizer agents
- Plagiarism checker and citation generator
- Works in MS Office, Google Docs and browsers
- Enterprise style guides, brand tones and DLP
S Spinbot
- Paraphrasing and text rewriting
- Up to 10,000 characters per use
- AI summary generator
- Grammar checker
- Spell and punctuation checker
- Online proofreader and essay checker
- No registration needed
Plans and prices
From each vendor's site. Prices change — confirm before buying.
Grammarly
Free€0
Pro€12/member/mo billed annually (€30 billed monthly)
EnterpriseCustom
Spinbot
FreeFree
Strengths and limitations
Grammarly
- Free plan includes grammar checks and 100 AI prompts a month
- Available on desktop, mobile, browser extensions, MS Office and Google Docs
- Pro includes plagiarism and AI-text detection
- Enterprise offers SSO, SCIM, BYOK and data loss prevention
- Pro costs €30 when billed monthly versus €12 billed annually
- Free plan is limited to 100 AI prompts per month
- Enterprise pricing is not published
Spinbot
- Free to use without sign-up
- Handles up to about 1,000 words per use
- Several writing tools on one site
- Free version shows ads
- Ad-free version price not listed on the pages
- 10,000-character limit per use
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Built from each vendor's public website; we haven't tested them hands-on. Editorial policy