3 Open Source Alternatives to Nuclino

A list of 3 carefully selected open-source alternatives to Nuclino.

Created by

Adrian

Mar 9, 2025Updated•4 min read

The open-source alternatives are ranked based on our custom ranking system and score. This system takes into account various factors to determine the best alternatives.

If you’re looking for alternative features or workflows, here is a prepared detailed list of Nuclino open-source alternatives — each with its own distinctive strengths and key features.

Affine

46,410

3,074

Affine is a next-generation knowledge base that merges docs, whiteboards, and databases into a seamless workspace. It offers privacy-first, open-source solutions designed to boost creativity and collaborative planning.

Key Features

Unified workspace integrating docs, whiteboards, and databases
Multimodal AI copilot for smarter writing, drawing, and planning
Privacy-first and local-first data control
Open-source with extensive customization and community contributions
Ready-to-use templates for diverse projects

Affine combines powerful writing, drawing, and planning tools in one unified platform. Its multimodal AI copilot helps transform ideas into structured content while enabling real-time collaboration and effortless creativity. Built with a local-first, privacy-focused approach, this customizable, open-source tool is ideal for individuals and teams looking to streamline their workflow.

Learn more about Affine

Outline

30,912

2,452

Outline is the fastest knowledge base designed for growing teams, offering a beautiful, real-time collaborative experience that is fully markdown compatible. It helps teams seamlessly organize information and improve productivity with a feature-packed, intuitive interface.

Key Features

Blazing fast editor with markdown support
Realtime collaborative editing with commenting and threads
Powerful search and AI-driven question answering
Seamless integrations with Slack, Figma, Loom, and more
Customizable branding, custom domains, and dark mode
Robust security with granular permissions
Open source with self-hosted options

Outline enables your team to create, manage, and share a dynamic knowledge base with ease. The platform boasts a blazing fast editor with markdown support, realtime collaborative editing, and powerful search capabilities including AI question answering. Integrated with tools like Slack and over 20 other popular integrations, it also offers customization options such as dark mode and custom domains. Outline is open source, allowing users to self-host and tailor the experience to their organizational needs.

Learn more about Outline

FastGPT

22,473

5,766

FastGPT is a free, open-source AI knowledge platform built on LLMs. It offers a suite of out-of-the-box capabilities including data processing, RAG retrieval, and visual workflow orchestration that empower users to build specialized AI assistants with ease.

Key Features

Domain-Specific AI Assistant creation using imported documents and Q&A pairs
Automated text preprocessing, vectorization, and QA segmentation
Visual drag-and-drop workflow orchestration
Seamless API integration with popular platforms like Discord, Slack, and Telegram
Comprehensive debugging tools and multi-model compatibility

FastGPT delivers a robust knowledge base platform that enables the creation of domain-specific AI assistants by automating text preprocessing, vectorization, and QA segmentation. Its visual drag-and-drop interface streamlines the design of complex workflows, while seamless API integrations with platforms like Discord, Slack, and Telegram allow for easy expansion and customization of LLM applications.

Learn more about FastGPT

Price comparison of Nuclino open-source alternatives

Tool	Tier 1	Tier 2	Tier 3	Details
Affine	$8.9 AFFiNE AI	$6.75 Pro	$10 Team	Learn more
Outline	$10 Starter	$79 Team	$249 Business	Learn more

* Pricing shown is based on publicly available information and may not reflect current rates. Visit each tool's website for detailed pricing information and additional tiers.

About Nuclino

Nuclino is a brand that is dedicated to empowering teams and promoting efficient collaboration. They recognize that the future of work is changing, becoming more team-based, distributed, and knowledge-intensive. Nuclino was founded in 2015 when the team experienced firsthand the challenges of collaborative knowledge work, with information spread across various silos and difficult to access and update. Frustrated with outdated and complex tools, they set out to create something better. Their vision was to develop a collective brain that enables teams to work seamlessly together. The first prototype was a success, and Nuclino has been continuously improving their tools ever since. They are committed to simplicity, speed, and unification, believing that tools should be easy to use, fast, and bring together information in a unified manner, reducing context switching and information silos. As an independent, profitable, and fully founder-owned company, Nuclino prioritizes their customers over investors. They have been in operation for over six years and are fully remote, leveraging their own product to facilitate effective teamwork. Based near Munich, Germany, Nuclino is dedicated to providing support and resources to help teams achieve their goals.