hackmd.io

One-line Introduction

HackMD.io is a real-time collaborative Markdown editor from Taiwan, built around team collaboration and AI agents. Its free plan is surprisingly capable, making it a good fit for developers and technical teams that need lightweight document collaboration.

Business Overview

HackMD is developed by a Taiwanese team and focuses on online Markdown editing with real-time collaboration—similar to Google Docs, but optimized specifically for Markdown syntax. Its history dates back to 2014, when it first became known through the open-source CodiMD project before later shifting toward commercial operations. Today, it is one of the more popular collaborative Markdown platforms worldwide.

In terms of market positioning, HackMD sits somewhere between all-in-one collaboration tools like Notion and local editors like Typora. Its core focus is multi-user collaboration around Markdown documents. Typical users include open-source project maintainers, technical bloggers, small startup teams, and some enterprise R&D departments.

The service is cloud-based, so users do not need to install a desktop client; editing can be done directly in the browser. It supports version history, comments and discussions, and permission management. Because the company is based in Taiwan, its server deployment and network optimization may be somewhat friendlier to users in Asia, though users in mainland China may still experience latency.

Who It’s Best For

HackMD is best suited for several types of users. First, individual developers and technical writers who are used to writing notes, documentation, or blog drafts in Markdown and want everything synced to the cloud. Second, small technical teams of around 3-10 people that need to quickly share technical documents, API references, or meeting notes without adopting a heavier database-driven tool like Notion. Third, open-source project maintainers, who can use HackMD to create collaborative contribution guides or developer manuals; even the free plan supports simultaneous editing by multiple users.

Less suitable use cases include project management teams that require complex tables, databases, or Kanban boards; enterprises with strict data sovereignty requirements that need self-hosting; and users in China with restricted network environments who cannot reliably access overseas services. Overall, HackMD is more of a lightweight writing tool than a full-featured collaboration platform.

Key Features and Highlights

• Real-time collaborative editing: Multiple users can edit the same Markdown document at the same time, with cursor positions and changes synced in real time, similar to the Google Docs experience.
• AI agent support: Built-in AI assistance can help generate content, rewrite paragraphs, or summarize documents, improving writing efficiency. The specific AI model used is not publicly disclosed.
• Version history and rollback: Edits are automatically saved, and users can restore previous versions to prevent accidental content loss.
• Comments and discussions: Users can highlight text and add comments directly, with support for @mentions, making it useful for document review workflows.
• One-click publishing and sharing: Documents can be published as public links, embedded into webpages, or exported in formats such as PDF and HTML.
• Extended Markdown syntax: Supports math formulas via LaTeX, flowcharts via Mermaid, code highlighting, and other features that are useful for technical documentation.

Pricing Analysis

HackMD’s pricing strategy is somewhat unclear. The official website does not publicly list specific monthly or annual pricing, only offering a “free plan” and a “team plan.” The free plan is already quite complete, including unlimited documents, basic collaboration, version history, and limited AI agent usage.

The team plan requires contacting sales for a quote. It is likely positioned in the mid-range—probably cheaper than Notion’s team plan, which is around USD 8-10 per user per month, but more expensive than purely open-source options such as self-hosted CodiMD. There is currently no publicly stated refund policy, so whether refunds are available after payment would need to be confirmed with customer support.

As for hidden costs, there is no public data for now, but users should note that AI agent features may have usage limits on the free plan and could incur additional charges once exceeded. In terms of value for money, the free plan is almost zero-cost for individual users. For teams with simple collaboration needs, the free plan may also be enough. However, if advanced permissions or more AI usage are required, the lack of transparent pricing may become a decision-making obstacle.

How Users in China Can Use It

Network accessibility: HackMD’s servers are overseas, though the specific data center locations are not publicly disclosed. Users in mainland China may experience slow loading or occasional connection failures. In ordinary broadband testing, the editor may take around 3-5 seconds to open. Editing is generally smooth, but lag may occur during peak hours.

Whether a proxy is needed: The service is basically accessible, but using a proxy is recommended for a more stable experience, especially when teams are collaborating and data is being synced frequently.

Payment methods: The free plan does not require payment. Payment methods for the team plan are not publicly disclosed. It likely supports international credit cards, but there is no clear support for Alipay or WeChat Pay.

Invoices: Taiwanese companies can usually issue electronic invoices, but mainland Chinese enterprise users should confirm whether a VAT invoice can be provided. There is no public information on this at the moment.

Domestic alternatives: If network reliability is unacceptable, users can consider 我来 wolai or FlowUs. Both support Markdown collaboration and have servers in mainland China, making access faster, though their feature focus differs slightly.

Pros and Cons

Pros:

• ✅ Generous free plan: Unlimited documents, basic collaboration, and version history make it almost unrestricted for individual users.
• ✅ Smooth real-time collaboration: Low latency for multi-user editing and accurate cursor syncing, better than many domestic competitors.
• ✅ AI agent integration: Built-in AI writing assistance lowers the barrier to creating technical documentation.
• ✅ Native Markdown support: Rich syntax extensions make it easy for technical users to get started.
• ✅ Taiwanese team with good Chinese support: The interface and documentation are available in Traditional Chinese, reducing communication friction for Chinese-speaking users.

Cons:

• ❌ Unstable access from China: Mainland China users may need a proxy, otherwise the experience can be compromised.
• ❌ Opaque pricing: Team plan pricing requires contacting sales, creating extra communication overhead.
• ❌ No clear refund policy: If users are dissatisfied after paying, the refund process is unclear and carries higher risk.
• ❌ Inconvenient domestic payment options: No Alipay or WeChat Pay options are clearly available, and the invoicing process for enterprise users is not transparent.
• ❌ Limited feature scope: Compared with Notion, it lacks advanced collaboration features such as databases and Kanban boards, making it less suitable for complex project management.

Comparison with Similar Products

• Notion: A more comprehensive collaboration platform with databases, Kanban boards, and Wiki features. However, its Markdown editing experience is not as pure as HackMD’s, and the free plan has more limitations. Best for teams that need multi-function integration.
• Typora + cloud sync drive: A local Markdown editor paired with iCloud or Dropbox can enable multi-device sync, but lacks real-time collaboration and commenting. Best for individual desktop use.
• CodiMD self-hosted: The open-source predecessor of HackMD, which can be deployed on your own server for full data control, but requires technical maintenance. Best for enterprises with high data privacy requirements.
• 我来 wolai: A domestic competitor with a similar Markdown collaboration experience. Its servers are in China, access is fast, and it supports WeChat login and Alipay payments, but its internationalization is not as strong as HackMD’s.

Final Recommendation

Best fit: If you are a developer or technical writer looking for a lightweight, real-time collaborative Markdown editor, and your team is relatively small, around 2-10 people, HackMD’s free plan is already very usable. It is especially suitable if you often collaborate with overseas colleagues or already have stable proxy access.

Not ideal for: If your team needs complex project management features such as Kanban boards or Gantt charts, requires extremely stable access from China, or must use domestic payment and invoicing options, domestic alternatives such as 我来 wolai or FlowUs should be considered first.

Suggested approach: Start with the free plan to test the collaboration workflow and network performance. If the experience is satisfactory, then contact sales for team plan pricing. Because public pricing and refund policies are lacking, it is not advisable to make a large upfront payment. Begin with a small-team trial first.