Keeper Security vs Mermaid

KSvs

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

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

The verdict

On the data we hold, Keeper Security 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.
Keeper Security starts lower, at $2/mo against $10/mo.
In our Tech stack ranking, Keeper Security places 28 and Mermaid 15 of 72.

Side by side

Keeper Security and Mermaid compared
At a glance	KSKeeper Security	Mermaid
Starts at	$2/mo	$10/mo
Free plan	Yes	Yes
API	Yes	No
MCP server	Yes	Yes
Links	Visit	Visit

Plans and pricing

Keeper Security

Business StarterSole proprietors and small teams$2/mo
Business Password ManagerGrowing companies requiring policy enforcement$3.75/mo
Enterprise Password ManagerLarge organizations needing SSO and SCIM$5/mo

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

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

Who each is for

Choose Keeper Security if…

We haven't written up who Keeper Security suits yet.

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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.

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