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Mermaid Online vs OpenWiki
A side by side look at Mermaid Online and OpenWiki: pricing, features and what each one is best for.
In this comparison
All comparisons
| Visit Mermaid Online | Visit OpenWiki | |
|---|---|---|
| What it costs | ||
| Pricing | Freemium | Open source |
| Pricing details | Editor free for personal and commercial use. AI credits: Monthly Package $9.9/month (100 credits), One-time Package $19.9 (100 credits, valid 1 month), Life-time Package $99.9 (6,000 credits, valid 120 months). | Free and MIT licensed, installed from npm as openwiki. You bring your own model key across thirteen supported providers, or run it inside Codex, Claude Code, OpenCode or Cursor and let the host agent's authenticated model do the work. There is no hosted tier and no pricing page. |
| Price range | $0 - $9.90/mo | No pricing page found |
| Free option | Free tier | Free tier |
| Plans |
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| What it is | ||
| What it does | Mermaid Online is a free browser Mermaid editor with live preview and SVG or PNG export, plus paid AI that turns text or screenshots into editable diagrams. | A LangChain CLI that writes a Markdown wiki for your codebase and keeps it current, tying every material claim back to versioned source evidence in git. |
What it costs
- Pricing
- Freemium
- Pricing details
- Editor free for personal and commercial use. AI credits: Monthly Package $9.9/month (100 credits), One-time Package $19.9 (100 credits, valid 1 month), Life-time Package $99.9 (6,000 credits, valid 120 months).
- Price range
- $0 - $9.90/mo
- Free option
- Free tier
- Plans
- Free editor$0/mo
- Monthly Package$9.90/mo
- One-time Package$19.90 once
- Life-time Package$99.90 once
What it is
- What it does
- Mermaid Online is a free browser Mermaid editor with live preview and SVG or PNG export, plus paid AI that turns text or screenshots into editable diagrams.
What it costs
- Pricing
- Open source
- Pricing details
- Free and MIT licensed, installed from npm as openwiki. You bring your own model key across thirteen supported providers, or run it inside Codex, Claude Code, OpenCode or Cursor and let the host agent's authenticated model do the work. There is no hosted tier and no pricing page.
- Price range
- No pricing page found
- Free option
- Free tier
- Plans
- Free (MIT, self-hosted CLI)$0/mo
What it is
- What it does
- A LangChain CLI that writes a Markdown wiki for your codebase and keeps it current, tying every material claim back to versioned source evidence in git.
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Read the full reviews
What each one is actually like to use, tested by hand rather than summarised from the vendor’s own page.
