Mermaid vs OpenAI API

Two Tech stack tools side by side: what each does, what it costs and who it suits.

The verdict Side by side Plans and pricing Who each is for Other options

The verdict

On the data we hold, Mermaid comes out ahead. Here is why, point by point.

What the data says

In our Tech stack ranking, Mermaid places 15 and OpenAI API 61 of 72.

Side by side

Mermaid and OpenAI API compared
At a glance	Mermaid	OpenAI API
Starts at	$10/mo	Not known yet
Free plan	Yes	Not known yet
API	No	Yes
MCP server	Yes	Yes
Links	Visit	Visit

Plans and pricing

Mermaid

BasicFree plan with up to 3 diagrams, limited diagram size and limited AI.Free
PlusUnlimited diagrams and 300 AI credits a year; 10 per user per month billed annually.$120/yr/seat
Premium2,000 AI credits a year, free viewer seats and unlimited teams; 20 per user per month billed annually.$240/yr/seat

OpenAI API

Pricing not in our catalogue yet.

Prices as the vendors list them. They change often; the final price is on their sites.

Who each is for

Choose Mermaid if…

Developers, technical writers and operations teams who keep diagrams as text next to their code and docs, so they stay versioned and never turn into stale screenshots.

Visit Read the review

Choose OpenAI API if…

A product or operations team with a developer that wants to build its own AI steps, such as drafting, classifying or voice, and prefers paying by usage over buying seats.

Visit Read the review

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