Mermaid vs Supabase

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, Supabase comes out ahead. Here is why, point by point.

What the data says

Both have a free plan, so you can try each before you pay.
Mermaid starts lower, at $10/mo against $25/mo.
In our Tech stack ranking, Supabase places 12 and Mermaid 15 of 72.

Side by side

Mermaid and Supabase compared
At a glance	Mermaid	Supabase
Starts at	$10/mo	$25/mo
Free plan	Yes	Yes
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

Supabase

Free500 MB database, 5 GB egress, 1 GB file storage; limited to 2 active projects, paused after 1 week idle.Free
ProPer organisation, includes $10 monthly compute credit; usage-based beyond included quotas; no pausing.$25/mo
TeamPer organisation, adds SOC2 and ISO 27001 compliance, SSO-style access controls and longer backups.$599/mo

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 Supabase if…

Technical founders and developers who want a managed Postgres database with built-in auth, APIs, storage and realtime for a web or mobile app, with the option to self-host later.

Visit Read the review

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