Free
Free
$0 entry plan on the pricing page.
- Diagrams
- 3 diagrams
- AI chats
- 5 AI conversations per day
- Export
- Low-res PNG export with watermark
Mermaid Viewer
● Identity checkedAssistant · Vendor site 2026-10-04
Mermaid Viewer is a browser-based editor to preview, edit, and share Mermaid diagrams with AI assistance. Paid tiers raise diagram limits, export quality, sharing, and version history while keeping a free entry plan for light use.
- Category
- Assistant
- Free access
- Free tier includes three diagrams, five AI conversations per day, and low-resolution PNG export with watermark.
- API access
- Not confirmed
Is Mermaid Viewer right for you?
A good fit for
Developers and technical writers who want quick online Mermaid editing with AI help and shareable links.
Before you choose
Free plan caps diagrams and daily AI conversations; Starter monthly billing is $6.99 versus higher yearly totals.
Online Mermaid diagrams
Mermaid Viewer hosts Mermaid editing, AI chat assistance, and export/sharing controls with Free, Starter, and Pro plans priced in USD monthly.
What it can do
Features & capabilities
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| Browser editor | Mermaid Viewer markets in-browser Mermaid preview and editing without local setup. | Facts sourced | 2026-10-04 |
| AI assistance | Plans bundle daily or monthly AI conversation allowances for diagram help. | Facts sourced | 2026-10-04 |
| Sharing | Paid tiers expand sharing, version history, and export formats. | Facts sourced | 2026-10-04 |
Understand the total cost
Mermaid Viewer pricing & plans
Starter
$6.99 /mo
$6.99 per month on the monthly Starter pricing toggle.
- Diagrams
- 30 diagrams
- AI chats
- 500 AI conversations per month
- Export
- High-res PNG export without watermark
Pro
$11.99 /mo
$11.99 per month on the monthly Pro pricing toggle.
- Diagrams
- Unlimited diagrams
- AI chats
- Unlimited AI conversations
- Formats
- PNG, JPG, PDF, and SVG exports
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Explore toolThe practical questions
Frequently asked questions
Can I upgrade or downgrade my plan anytime?
Mermaid Viewer FAQ states plan changes take effect immediately with prorated billing.
What happens to my diagrams if I downgrade?
FAQ notes existing diagrams remain, but new creations may be blocked until usage is under the downgraded plan limit.
What is Mermaid Viewer used for?
Mermaid Viewer is a browser-based editor to preview, edit, and share Mermaid diagrams with AI assistance. Paid tiers raise diagram limits, export quality, sharing, and version history while keeping a free entry plan for light use.
Does Mermaid Viewer have a free plan?
Free tier includes three diagrams, five AI conversations per day, and low-resolution PNG export with watermark.. This record lists ongoing free access; check the plan limits before starting.
How much does Mermaid Viewer cost?
The listed monthly price is $6.99 USD at monthly billing. See the plan cards for entitlements, billing commitments and seat minimums.
Can I use Mermaid Viewer through an API?
Not confirmed. API access and subscription access may have different terms; consult the linked sources.
What should I check before choosing it?
Free plan caps diagrams and daily AI conversations; Starter monthly billing is $6.99 versus higher yearly totals.
Price history
No retained pricing changes yet. A current price alone does not establish a historical trend.
How this profile is supported
Identity and profile
Reviewed vendor source
Read original source ↗Facts apply to the named version and check date. Send a sourced correction if something changed.