Can I use content created with AI writing tools commercially?

Most paid plans, including ChatGPT, Claude, Gemini, Perplexity, 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 general Korean chat and document work, ChatGPT, Claude, and Gemini are solid starting points, while Perplexity is strong when cited fresh information matters. DeepL remains a strong translation choice with Korean UI support, and Notion AI is worth comparing for workspace-based writing.

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

AI text and writing tools are easier to compare when you separate general assistants, marketing copy, proofreading, translation, and document-grounded work. ChatGPT, Claude, Gemini, and Perplexity set the baseline for general chat and work assistance; Jasper and Copy.ai are stronger for branded content; Grammarly for English proofreading; and DeepL for translation. If you need polished Korean output, check Korean support, commercial-use terms, API availability, and pricing before you decide.

13 toolsUpdated 2026-06-16

Subcategories

13 tools

ChatGPT

The mainstream general AI assistant

Popularity

OpenAI's general AI assistant for chat, documents, images, voice, coding, and research, with apps, custom GPTs, and business workspaces.

Edge

Its largest advantage is the connected ecosystem across consumer apps, custom GPTs, business workspaces, and the developer platform.

Free planfrom $0/moKoreanAPI

Gemini

AI assistant for the Google ecosystem

Popularity

Google's AI assistant for writing, research, and multimodal work, connected to Google Search, Gmail, Docs, Drive, YouTube, and related services.

Edge

Deep ties to Google Search, Workspace, and Android make it low-friction for users already working in Google's ecosystem.

Free planfrom $0/moKoreanAPI

Grammarly

An English writing assistant that works everywhere

Popularity

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

NotebookLM

Source-grounded AI research notebook

Popularity

Google's research tool for turning PDFs, Docs, Slides, websites, YouTube, and other sources into grounded notebooks with chat, summaries, audio overviews, and video overviews.

Edge

It differs from a general chatbot by grounding answers in selected sources and turning them into study artifacts such as audio, video, and mind maps.

Free planfrom $0/moKoreanAPI

Perplexity

Cited AI answer engine

Popularity

An AI answer engine with cited fresh answers, Deep Research, file and app search, the Comet browser, and developer API access.

Edge

It puts search and citations ahead of general chat, making it strong for fresh information discovery and source checking.

Free planfrom $0/moKoreanAPI

Claude

Collaborative assistant for long-context work

Popularity

Anthropic's AI assistant for long-context chat, writing, analysis, coding, Artifacts, and Projects that help produce work outputs collaboratively.

Edge

Its distinctive strength is the Artifacts workflow for refining documents, code, and visual outputs beside long-context conversations.

Free planfrom $0/moKoreanAPI

DeepL

AI translation that reads naturally in context

Popularity

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

Copy.ai

AI for automating sales and marketing copy

Popularity

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

Jasper

Brand-voice AI copywriter for marketing teams

Popularity

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

ChatPDF

Fast conversational PDF analysis

Popularity

A document Q&A tool for uploading PDFs, Word, PowerPoint, and text files, asking questions, and receiving source-referenced answers.

Edge

Its edge is a simple no-account PDF chat flow paired with a backend API for lightweight integrations.

Free planfrom $0/moKoreanAPI

Notion AI

An AI writing assistant built into your workspace

Popularity

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

Sudowrite

An AI creative partner for novelists

Popularity

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

Popularity

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 ChatGPT, Claude, Gemini, Perplexity, 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 general Korean chat and document work, ChatGPT, Claude, and Gemini are solid starting points, while Perplexity is strong when cited fresh information matters. DeepL remains a strong translation choice with Korean UI support, and Notion AI is worth comparing for workspace-based writing.
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.