Can I use content created with AI writing tools commercially?

Most paid plans, including those from Jasper, Copy.ai, Grammarly, and DeepL, allow commercial use of generated content. Free plans may come with feature or usage limits, however, so it's worth reviewing each service's terms before you use it.

Which tool is best for writing Korean content?

For translation, DeepL offers a Korean UI and natural-sounding results, while Notion AI is a solid choice for workspace-based Korean document writing. Grammarly is English-only and does not support Korean proofreading.

Are there any open-source or self-hostable text tools?

For translation, there's LibreTranslate, licensed under AGPL-3.0, which you can install on your own server and run offline. It's a good fit for environments where data privacy is a priority.

AI Text & Writing Tools Compared

The right AI text and writing tool depends on what you're doing. For marketing copy and branded content, Jasper and Copy.ai stand out; for English proofreading, Grammarly; and for translation, DeepL. If you need polished Korean output, check the level of Korean support (UI as well as input/output), whether commercial use is allowed, API availability, and pricing before you decide.

7 toolsUpdated 2026-05-30

Subcategories

7 tools

DeepL

AI translation that reads naturally in context

Rating

An AI translator renowned for natural, context-aware translation, supporting text and document translation in more than 33 languages, including Korean.

Edge

Its key differentiator is natural, context-aware translation quality rather than mechanical, word-for-word output.

Free planfrom $0/moKoreanAPI

Jasper

Brand-voice AI copywriter for marketing teams

Rating

An AI content platform for marketing teams that learns your brand voice to consistently generate blog, ad, email, and social copy from a single brief.

Edge

Its key differentiator is specialization in brand-voice learning and campaign workflows, churning out consistent team-wide marketing content.

from $69/moKoreanAPI

Grammarly

An English writing assistant that works everywhere

Rating

An English writing assistant that works everywhere through a browser extension and desktop app, suggesting grammar and spelling fixes, tone and clarity improvements, and sentence rewrites.

Edge

Its key differentiator is an extension that plugs into nearly every app and website to provide real-time English proofreading.

Free planfrom $0/mo

Notion AI

An AI writing assistant built into your workspace

Rating

An AI assistant built into the Notion workspace that handles writing, summarizing, and translating, and adds Ask Notion and AI agent features that search across your entire workspace to answer questions.

Edge

Its core differentiator is deep workspace integration: it writes and answers questions using the context of your own documents and databases.

Free planfrom $0/moKorean

Copy.ai

AI for automating sales and marketing copy

Rating

An AI writing tool built for sales and marketing copy, generating ad, email, and blog copy through more than 90 templates and workflow automation.

Edge

Its differentiator is combining GTM (go-to-market) workflow automation with brand voice profiles to automate sales copy production.

Free planfrom $0/moKoreanAPI

Sudowrite

An AI creative partner for novelists

Rating

An AI writing partner for novelists and creative writers, with tools purpose-built for long-form fiction such as story development, descriptive expansion, and character building.

Edge

Its key differentiator is a focus on long-form fiction workflows rather than marketing copy.

from $19/moKorean

LibreTranslate

Self-hostable open-source translation API

Rating

A fully self-hostable open-source machine translation API that works even offline and supports translation across many languages, including Korean.

Edge

Its key differentiator is fully offline, self-hosted operation with no external cloud, keeping your data private.

Free planfrom $0/moOpen sourceKoreanAPI

How to choose an AI Text tool?

Can I use content created with AI writing tools commercially?: Most paid plans, including those from Jasper, Copy.ai, Grammarly, and DeepL, allow commercial use of generated content. Free plans may come with feature or usage limits, however, so it's worth reviewing each service's terms before you use it.
Which tool is best for writing Korean content?: For translation, DeepL offers a Korean UI and natural-sounding results, while Notion AI is a solid choice for workspace-based Korean document writing. Grammarly is English-only and does not support Korean proofreading.
Are there any open-source or self-hostable text tools?: For translation, there's LibreTranslate, licensed under AGPL-3.0, which you can install on your own server and run offline. It's a good fit for environments where data privacy is a priority.