Aithor profile · Grammarly profile
Aithor and Grammarly are two AI writing tools with different starting points. Aithor, from Aithor in Tallinn, Estonia, is a writing platform built around essays and academic work — drafting, paraphrasing, citations, and AI text tools. Grammarly, from Grammarly (now part of Superhuman), is a writing assistant that checks grammar, spelling, and tone wherever you type. This page compares verified facts about each tool side by side. Both are listed in our Writing category.
What each tool is
Aithor is an AI writing platform at aithor.com. Its listed tools include an AI essay writer and editor, an AI paraphraser, an AI humanizer and AI detector, a citation and reference generator (APA, MLA, ACS, Chicago, IEEE), a table of contents tool, and a reference finder across 10M+ sources. Humanizer and Detector APIs are offered for teams.
Grammarly is an AI writing assistant at grammarly.com. Its listed features include real-time grammar, spelling, and punctuation checks, full-sentence rewrites, tone adjustments, generative AI for drafting and ideation, a plagiarism checker, citation tools, a tone detector, and style guides with brand tones for teams.
Side-by-side comparison
| Aithor | Grammarly | |
|---|---|---|
| Developer | Aithor (Tallinn, Estonia) | Grammarly (Superhuman) |
| Official site | aithor.com | grammarly.com |
| What it does | AI writing platform for essays, academic writing, and editing | AI writing assistant for grammar, spelling, tone, and rewrites |
| Free plan | Yes | Yes |
| Paid plans | $24.99/month monthly, or $12.50/month billed twice yearly | Pro: $12/month; Enterprise: contact sales |
| Platforms | Web, API | Web, browser extensions, Windows, macOS, iOS, Android, MS Office, Google Docs |
| Drafting | AI essay writer with auto-citations | Generative AI drafting and ideation |
| Editing focus | Paraphraser, rewriter, AI editing | Grammar, spelling, punctuation, clarity, tone |
| Citations | Citation generator (APA, MLA, ACS, Chicago, IEEE), reference finder | Citation tools, consistent citations (Pro) |
| AI text tools | AI Detector and AI Humanizer, with APIs for teams | AI-generated text detection (Pro) |
Facts verified against aithor.com and grammarly.com on 23 September 2026. Plans and prices can change; check the official pricing pages for current details.
Pricing and free plans
Both tools offer a free plan. Aithor’s free plan at $0 includes limited content generation with rate-limited Humanizer, Detector, and Paraphraser access; the paid plan is $24.99/month on monthly billing or $12.50/month when billed twice yearly ($74.99 per six months). Grammarly’s free plan at $0 covers writing without mistakes, tone visibility, and 100 AI prompts per month; Pro is $12/month with full-sentence rewrites, tone adjustments, plagiarism and AI-text detection, and 2,000 AI prompts, while Enterprise is priced via contact sales. Details verified on the official pricing pages at aithor.com/subscription and grammarly.com/plans.
Platforms
Aithor is available on the web and via API, including Humanizer and Detector APIs for teams. Grammarly works on the web, through browser extensions (Chrome, Safari, Firefox, Edge), desktop apps for Windows and macOS, mobile keyboards for iOS and Android, and integrations with Microsoft Office and Google Docs.
Which fits different use cases
Neither tool is universally better; the right choice depends on the task at hand:
- If your main work is essays or academic writing with citations, Aithor is built around that workflow — essay drafting, paraphrasing, and reference formatting.
- If you mainly polish text you already wrote — emails, documents, reports — Grammarly meets you inside the apps where you type with grammar, spelling, and tone checks.
- If you need programmatic access to AI text tools, Aithor offers Humanizer and Detector APIs for teams.
- If you want organization-wide controls, style guides, and brand tones, Grammarly offers team and Enterprise plans.
Writers may also want to browse our Writing category for tools focused specifically on writing tasks.
Try them with ready-made prompts
A practical way to compare the two is to run the same task in each. Browse the Aithor prompt library and the Grammarly prompt library for ready-to-use
prompts, and see our guide on how to choose an AI writing tool for broader guidance.
For children’s storytelling rather than academic writing, see Fableoo, which creates interactive stories for kids ages 4-12.