Grammarly

Notion AI

Freemium

Notion AI sits inside a Notion workspace and works on the pages, databases and notes a team already keeps there. You can ask questions about a document, generate a first draft, translate text, fill database properties automatically, and have meetings captured as notes with action items. Notion Agent carries out multi-step tasks such as building a page, editing a database or pulling information from connected apps like Slack and Google Drive. Enterprise Search looks across those same tools. AI usage is metered in monthly credits on Business and Enterprise plans.

Wordtune

Freemium

Wordtune works at sentence level. Instead of generating whole documents, it offers several rewrite options for the sentence you just wrote, along with switches for formal or casual tone and corrections for grammar, spelling and phrasing. It also continues a stalled paragraph, suggests synonyms and translates text into English across ten languages. Most people use it through the Chrome extension inside Gmail, docs or a CMS, and a web editor covers everything else. The Basic plan is free with limits; Advanced costs $6.99 per month, and a three-day trial covers the paid tiers.

QuillBot

Freemium

QuillBot is a set of editing tools gathered around a paraphraser. You paste text and get rewritten versions in more than ten modes, including academic, formal and simple, or define a custom mode for a house style. Grammar checking, an AI detector, an AI humanizer, a plagiarism checker, a summarizer and a citation generator sit in the same account, which makes it useful for students assembling essays and for editors polishing client copy. The free tier caps paraphrasing at 100 words and two modes; Premium at $8.33 per month on annual billing lifts those limits and adds full detector and humanizer access.

Rytr

Freemium

Rytr has changed shape: it now remembers clients and commitments across email, Slack, calendars and meeting notes, then helps you write the follow-up. The writing side, called Create, offers more than forty use cases such as emails, ads and posts, with 22 tones and support for 38 languages, and can produce up to three drafts at once. A browser extension rewrites text in any input box, while Engage supplies morning briefs and meeting prep. The free plan allows 10,000 characters monthly; Lite at $9 per month removes the character cap.

Sudowrite

Paid

Sudowrite is a writing environment for fiction authors rather than a general assistant. A Story Bible walks from premise to outline to chapter beats, and the drafting tools extend, describe, rewrite or continue prose in your own voice. Two in-house models built for narrative work sit alongside dozens of third-party models, and a feedback feature returns developmental notes, line edits and beta reads on finished drafts. Series continuity, style matching and character art round it out. Plans are credit-based, starting at $19 per month billed monthly ($10 yearly) for 225,000 credits, and the trial needs no card.

Writesonic

Paid

Writesonic began as a copywriting assistant but now sells itself as an AI search visibility platform that still writes. It tracks how often your brand appears in answers from ChatGPT, Gemini and Google AI Overviews, then drafts articles and runs site audits to close the gaps it finds. Plans are organized by prompt and answer volume, articles per month and seats: Starter covers 15 articles and ten audits monthly. There is no free plan, only a seven-day trial, and the entry price is $79 per month on annual billing, which puts it beyond most individual writers and aimed at agencies and in-house marketing teams.