Hong Kong-based BuildinAI emerges as a cost-effective rival to Notion and OneNote, providing advanced AI features, comprehensive workspace tools, and seamless synchronization across devices, all at half the price of mainstream options.
For years, Notion and OneNote have defined the idea of a note-taking app that can also serve as a wider workspace. Both let users store notes, projects and reference material in one place, and both have become familiar choices for people who want more than a simple document editor. But as artificial intelligence has become central to productivity software, their AI features have increasingly felt like paid extras bolted on to the core product rather than part of the experience itself.
That pricing matters. According to the XDA Developers article, Notion removed its separate AI add-on in May 2025, pushing users who want the full set of AI tools, including Notion Agent and meeting notes, on to its Business tier at $20 a user a month. OneNote remains free as a standalone app, but Microsoft’s Copilot features require Microsoft 365 Premium at $20 a month or a Business Copilot add-on layered on top of a Microsoft 365 licence. BuildinAI’s pricing page says its AI add-on costs $10 a month for 3,000 requests and can be added to any plan, including the free tier.
BuildinAI, developed by Hong Kong-based COASIS, is positioned as an AI-native alternative that mirrors much of Notion’s structure without matching its subscription cost. The app runs on the web, Windows, macOS, iOS and Android, with live synchronisation across devices. It uses the same block-based approach popularised by Notion, allowing users to move, link and convert text, pages, databases and mind maps. The XDA Developers review says its database tools are unusually complete for a rival, covering formula fields, relations, rollups and timestamps as well as standard properties such as dates, emails and files.
Its AI tools are the main differentiator. According to BuildinAI’s pricing page, free accounts receive 10 AI chat requests a month, while paid users get a much larger allowance without needing to upgrade the workspace itself. The XDA Developers review says users can choose between models from GPT, Gemini and DeepSeek, and can direct the AI to search the web, the workspace or both. That means the assistant can summarise notes, answer questions from stored documents and draft new text in place, rather than sitting in a separate panel that feels detached from the rest of the product.
BuildinAI also goes beyond the features that separate Notion and OneNote most clearly. XDA Developers says mind maps are built into the product rather than added through external tools, and that the free tier allows up to 300 nodes. It also includes timeline views alongside table, board, gallery, list and calendar layouts, which makes it more useful for planning long projects. The result, the review argues, is a workspace that does what many users now want from Notion and OneNote, but at roughly half the AI cost and with less friction between note-taking and automation.
Disclaimer: This content is intended for informational purposes only. Readers are advised to exercise their own judgement, conduct due diligence, or consult a qualified expert before acting on any information provided.
