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Open-Source GrammarlyGO Alternatives (2027): 9 Private AI Writing Assistants That Rewrite, Draft and Summarise

Open-Source GrammarlyGO Alternatives: Private AI Writing Assistants That Rewrite, Draft and Summarise

GrammarlyGO was Grammarly's generative AI: you typed a prompt and it drafted a reply, rewrote a paragraph, changed the tone or summarised a thread. The name is gone. The old grammarly.com/grammarlygo address now redirects to an "AI at Grammarly" page, the company renamed itself Superhuman on 29 October 2025, according to its press release, and its AI assistant is now called Superhuman Go. On Grammarly's plans page, the free plan includes 100 AI prompts a month and Pro (€12 in the euro view) includes 2,000 prompts per member a month, and every prompt is processed on its servers.
Open-source tools take the other route: a language model that runs on your own laptop or server, and a writing tool that sends your selected text to that model instead of to a cloud. This list is about the generative side of GrammarlyGO: rewriting, drafting, tone and summaries. If you need a grammar or spell checker, see our separate list of open-source Grammarly alternatives. We checked the licence, latest release and features of every project below on its official website or repository in November 2026.
Quick answer: install Ollama to run an open model on your computer, then add Page Assist to your browser: select text on any page, right-click and choose Rephrase or Summarize, or create your own prompts such as "make this more formal". For rewriting inside documents, use the AI plugin in ONLYOFFICE Desktop Editors or LocalWriter for LibreOffice Writer. If you want one app with no setup, Jan or AnythingLLM install like any desktop program and run models offline.
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Open-Source GrammarlyGO Alternatives Compared

ToolWhat it does for your writingLicenceLatest releaseWhere it runs
OllamaRuns open language models locally for the other toolsMITv0.40.13, 28 Oct 2026macOS, Windows, Linux, Docker
Page AssistRight-click Summarize, Rephrase, Translate, Explain and your own promptsMITv1.5.90, 1 Nov 2026Chrome, Edge, Brave, Firefox and other browsers
ONLYOFFICE Desktop Editors + AI pluginRewrite, expand, summarise and adjust tone inside documentsAGPL-3.010.0.0, 22 Oct 2026Windows, macOS, Linux
LocalWriterEdit or continue selected text in LibreOffice WriterMPL-2.0v0.0.8, 31 Aug 2025LibreOffice extension
JanOffline ChatGPT-style app with custom assistantsApache-2.00.8.8, 28 Oct 2026Windows, macOS, Linux
AnythingLLMPrivate AI assistant that also works with your documentsMITv1.19.0, 26 Oct 2026macOS, Windows, Linux
Nextcloud AssistantGenerate, summarise and reformulate text in NextcloudAGPL-3.0v4.1.0, Oct 2026Your Nextcloud server
LibreChatSelf-hosted chat for a team, many model providersMITv0.8.8, 1 Oct 2026Docker or Node.js server
KoboldCppLocal model runner with a story-writing modeAGPL-3.01.124.2, 31 Oct 2026Windows, Linux, macOS
Sources: each project's official website, GitHub repository, licence file and releases page, checked 2 November 2026.

How an Open-Source AI Writing Assistant Works

GrammarlyGO bundled two things: a language model in Grammarly's cloud and buttons in your apps that send text to it. Open-source setups split these into two layers that you choose separately:
  • The model runner (Ollama, or the engine built into Jan, AnythingLLM and KoboldCpp) downloads an open model and runs it on your computer.
  • The writing tool (Page Assist in the browser, the ONLYOFFICE AI plugin, LocalWriter, Nextcloud Assistant) takes the text you select, adds an instruction such as "rewrite in a friendly tone" and shows the result.
  • The model itself decides the quality. Open-licence models such as gpt-oss, Qwen3 and Mistral Small run on a recent laptop; larger ones need a strong graphics card.
Most of these tools can also connect to a cloud API such as OpenAI or Anthropic. That is useful when your laptop is slow, but your text then leaves your device again, so pick a local model for anything confidential.

The 9 Best Open-Source GrammarlyGO Alternatives in 2027

1. Ollama: the engine that runs the model on your computer

Ollama is not a writing tool on its own, but almost every option below can use it. It downloads open models and runs them locally on macOS, Windows or Linux (or in Docker), and other apps talk to it on your machine. It is MIT-licensed; version 0.40.13 came out on 28 October 2026. Ollama also offers cloud models, and its homepage says "Your prompts are never stored or trained on"; for full privacy, stick to the models you download.

2. Page Assist: right-click rewriting in your browser

Page Assist is the closest open-source match for GrammarlyGO's "select text and ask AI" habit. It is an MIT-licensed browser extension for Chrome, Edge, Brave, Firefox, Vivaldi and other browsers that opens a sidebar on any page (Ctrl+Shift+Y) and a full chat window. Its Sidebar Copilot adds five built-in actions to the right-click menu for selected text: Summarize, Rephrase, Translate (to English), Explain and Custom. You can add your own copilot prompts, for example "Make this shorter" or "Rewrite for investors", using {text} as the placeholder for your selection.
Page Assist connects to Ollama, Chrome's built-in Gemini Nano, or any OpenAI-compatible endpoint such as LM Studio or llamafile. Version 1.5.90 came out on 1 November 2026. One limit: the result appears in the sidebar, so you copy it back into your email or form yourself.

3. ONLYOFFICE Desktop Editors with the AI plugin: rewrite inside documents

ONLYOFFICE Desktop Editors is a free AGPL-3.0 office suite for documents, spreadsheets, presentations and PDFs; version 10.0.0 came out on 22 October 2026. Its AI plugin, installed from the Plugin Manager and disabled by default, adds an AI inline agent (beta): press Ctrl+/ in the document and ask it to summarise content, expand ideas, rewrite or adjust tone and style. Besides cloud providers such as OpenAI, Anthropic and Mistral, you can add local providers such as Ollama or LM Studio by their address, so a draft never has to leave your computer.

4. LocalWriter: generative AI for LibreOffice Writer

LocalWriter is a small LibreOffice Writer extension that adds two commands. Edit Selection (Ctrl+E) asks for an instruction, such as a tone change or translation, and replaces the selected text with the edited version. Extend Selection (Ctrl+Q) continues the selected text, which works for drafting from a prompt. It talks to Ollama, text-generation-webui or any OpenAI-compatible server. The code is under MPL 2.0, with some parts under CC BY-SA 3.0. Development is slow: the latest release, v0.0.8, dates from 31 August 2025, with the last code change in February 2026, so test it before you rely on it.

5. Jan: an offline ChatGPT-style app for drafting

Jan describes itself on GitHub as "an open source alternative to ChatGPT that runs 100% offline on your computer". You install it on Windows, macOS or Linux, download a model such as Qwen or gpt-oss from Hugging Face inside the app, and chat with it; the llama.cpp engine is built in, so you do not need Ollama. For writing, create custom assistants with fixed instructions, such as "rewrite my notes as a LinkedIn post" or "reply to this customer email politely". Jan can also connect to OpenAI, Anthropic, Mistral and Groq, supports MCP tools, and offers a local OpenAI-compatible API on localhost:1337. It is Apache-2.0; version 0.8.8 came out on 28 October 2026.

6. AnythingLLM: a private assistant that knows your documents

AnythingLLM calls itself "A private AI assistant that runs entirely on your computer", with no accounts, no API keys and no token limits. The desktop app for macOS, Windows and Linux picks a model for your hardware and runs it locally. Its strength for writers is context: upload your product notes, past blog posts or pitch deck, and the assistant drafts and rewrites with those facts while the documents stay on your device. It also has agents with web search and custom skills. AnythingLLM is MIT-licensed; version 1.19.0 came out on 26 October 2026.
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7. Nextcloud Assistant: AI writing for a self-hosted team

Nextcloud Assistant brings text tasks into Nextcloud, the self-hosted file and collaboration platform: Generate text, Summarize, Generate headline, Extract topics, Context write and Reformulate text. To keep everything in-house, the admin installs the llm2 app, which "runs open source AI language models locally on your own server hardware" using llama.cpp; the docs advise a GPU with enough memory for the features you need. The Assistant app is AGPL-3.0, with version 4.1.0 released in October 2026. It suits a team that already runs Nextcloud, not a solo founder.

8. LibreChat: one self-hosted AI chat for the whole team

LibreChat is an MIT-licensed web app that "brings together all your AI conversations in one unified, customizable interface". You host it yourself, connect the models your team may use (Anthropic, OpenAI, Azure, AWS and others, plus local models through Ollama or vLLM), and sign people in with SSO through OAuth, SAML or LDAP. For writing, teams share agents and saved setups for recurring jobs such as release notes or support replies. The repository moved to the LibreChat-AI organisation, the website says LibreChat is joining ClickHouse, and the latest stable release, v0.8.8, came out on 1 October 2026.

9. KoboldCpp: long-form and story writing with a local model

KoboldCpp runs GGUF models from one executable file with no installation, on Windows, Linux or macOS, and bundles the KoboldAI Lite interface. It can "generate text in chat, adventure, instruct, or story writing modes", and its memory and world-info features help keep characters and facts consistent over long texts, which suits fiction, scripts and newsletters more than quick email fixes. It also exposes an OpenAI-compatible API on localhost:5001, so other writing tools can use it. KoboldCpp is AGPL-3.0; version 1.124.2 came out on 31 October 2026.
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Which Open Models Should You Run?

The tool is only half of the answer; the model decides how well it rewrites. Check the licence on each model's Hugging Face page, because "open" does not always mean open source:
  • Apache-2.0 models: OpenAI's gpt-oss-20b, Qwen3, Mistral Small 3.2, AI2's OLMo 3 and IBM's Granite 4.0 are all published under Apache-2.0, so you can use them commercially.
  • Custom licences: Google's Gemma models use the Gemma licence and Meta's Llama models use the Llama community licence. Both allow a lot of use, but they are not open-source licences, so read the terms before you build a product on them.
  • Size: start with a small model for rewriting and summaries; long reports and nuanced tone work better with larger models, which need more memory. AnythingLLM can recommend a model for your hardware.

Pair It With an Open-Source Grammar Checker

GrammarlyGO sat on top of Grammarly's grammar checks. Generative models rewrite well but do not underline every typo, so most founders combine one tool from this list with a checker: Harper (English, in the browser), a self-hosted LanguageTool server for many languages, or the Writing Tools hotkey app, which proofreads and rewrites selected text with your own model. All three are covered, with licences and setup, in our guide to open-source Grammarly alternatives.

GrammarlyGO Alternatives That Are Discontinued, Changed or Not Open Source

Several tools from older lists, including the 2025 version of this one, need a warning:
  • GrammarlyGO itself: the name is no longer used. Grammarly's AI prompts are part of its Free and Pro plans, and the Enterprise plan is "available through Superhuman Go".
  • Open WebUI: a popular web interface for Ollama, but its current licence, the Open WebUI License, adds a clause that forbids removing its branding in deployments with more than 50 users in 30 days without permission. That is no longer a standard open-source licence, so we left it out of the list.
  • LM Studio: free to download and good with local models, but its website does not describe the app as open source; only its lms command-line tool is published on GitHub under MIT.
  • GPT4All: still MIT-licensed, but the latest release, v3.10.0, dates from 25 February 2025 and the last code change from May 2025. Treat it as unmaintained.
  • Scramble: the MIT-licensed "Open-Source Grammarly Alternative" browser extension from the old list. Its README says the maintainer is not actively developing it, and the last code change was in June 2025. Page Assist does the same job.
  • UniJump: unijump.app now hosts an unrelated service (checked October 2026).
  • ZeroGPT Grammar Checker: a free online service with no published source code or licence, so not open source.
  • LanguageTool, After the Deadline, Grammalecte, Notepad++, Flyspell and LibreOffice's spell check: grammar and spelling tools, not generative writing assistants. They are reviewed in our open-source Grammarly alternatives list (After the Deadline's hosted service has shut down).

Which Open-Source GrammarlyGO Alternative Should You Choose?

  • You want right-click rewriting on any website: Page Assist with Ollama.
  • You write proposals and reports in an office suite: ONLYOFFICE Desktop Editors with the AI plugin, or LocalWriter if you live in LibreOffice Writer.
  • You want one app with no setup: Jan, or AnythingLLM if the AI should draft from your own documents.
  • Your team already self-hosts: Nextcloud Assistant with llm2, or LibreChat as a shared chat with single sign-on.
  • You write fiction, scripts or long newsletters: KoboldCpp.
  • You mainly need typo and grammar fixes: a grammar checker from our open-source Grammarly alternatives guide, not a language model.
Comparing hosted tools as well? Our tips for Grammarly's AI writer show what the paid route offers, and the list of free AI writing tools covers free cloud options.

How Founders Use Open-Source AI Writing Assistants

A small startup writes all day: cold emails, investor updates, grant applications, help-centre articles and landing pages. A practical setup is Ollama with one Apache-2.0 model, Page Assist for quick rewrites in Gmail, LinkedIn or your CMS, and AnythingLLM loaded with your product notes for first drafts that get the facts right. Confidential texts such as term sheets, customer data and unannounced features are the strongest reason to keep the model on your own machine. Keep a human edit at the end: a local model can sound confident and still be wrong.
The same open-source approach works across your stack. See our guides to open-source Notion AI alternatives for notes and wikis, open-source Coda AI alternatives for docs with databases, open-source GitHub Copilot alternatives for coding, open-source ElevenLabs alternatives for voice and open-source DALL-E alternatives for images. When your drafts are ready to rank, our AI SEO tool helps you plan the articles.

FAQ About Open-Source GrammarlyGO Alternatives

What happened to GrammarlyGO?

The name is no longer used. grammarly.com/grammarlygo now redirects to an "AI at Grammarly" page, the company renamed itself Superhuman on 29 October 2025, and its AI assistant is called Superhuman Go. Grammarly's plans now count AI prompts: 100 a month on Free and 2,000 per member a month on Pro.

What is the best open-source alternative to GrammarlyGO?

For rewriting selected text in the browser, Page Assist with a local model in Ollama. For documents, the ONLYOFFICE AI plugin or LocalWriter for LibreOffice. For a simple all-in-one app, Jan or AnythingLLM.

Can I rewrite text with AI completely offline?

Yes. Jan, AnythingLLM and KoboldCpp run models on your computer without internet once the model is downloaded, and Page Assist, ONLYOFFICE and LocalWriter can use a local model through Ollama.

Is there an open-source AI writing extension for Chrome?

Yes. Page Assist (MIT) works in Chrome, Edge, Brave, Firefox and other browsers and adds Summarize, Rephrase, Translate, Explain and your own prompts to the right-click menu. Scramble, an older option, is no longer actively developed.

Is LM Studio open source?

No. LM Studio is free to download, but the app is not published as open source; only its lms command-line tool is on GitHub under MIT. Jan and AnythingLLM are open-source alternatives with built-in model runners.

Is Open WebUI open source?

Not in the strict sense any more. Its current Open WebUI License is BSD-style but forbids removing its branding in deployments with more than 50 users in 30 days without permission. Small teams can still use it; check the licence first.

Which open models are best for writing?

Apache-2.0 models such as gpt-oss-20b, Qwen3 and Mistral Small 3.2 handle rewriting and summaries well on a recent laptop. Gemma and Llama models work too but use their own licences.

Do I need a powerful computer?

Not for small models: they run on a recent laptop, and replies come faster with a graphics card. Larger models need much more memory, and Nextcloud's documentation advises a GPU with enough memory for a shared team server.

Can open-source tools check grammar like Grammarly?

Yes, but those are different tools: Harper, LanguageTool and LTeX+ check grammar locally. Our open-source Grammarly alternatives guide compares them.

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About the Author

Violetta Bonenkamp, also known as MeanCEO, is an experienced startup founder with an impressive educational background including an MBA and four other higher education degrees. She has over 20 years of work experience across multiple countries, including 5 years as a solopreneur and serial entrepreneur. Throughout her startup experience she has applied for multiple startup grants at the EU level, in the Netherlands and Malta, and her startups received quite a few of those. She’s been living, studying and working in many countries around the globe and her extensive multicultural experience has influenced her immensely.
2026-11-02 19:48 Top Alternatives