Kroki

Unified API that turns text descriptions into diagrams

About Kroki

Kroki exposes a single HTTP API that renders diagrams from plain-text descriptions using more than thirty underlying libraries, including PlantUML, Mermaid, GraphViz and Excalidraw. It can be used as a hosted service or self-hosted on your own infrastructure for documentation pipelines.

Kroki website preview

Live preview of kroki.io via the WordPress mShots service — it can take a few seconds to generate on a first visit.

Kroki: strengths & things to check

Strengths

Completely free to use — this directory lists no paid plan for it.
Covers diagrams, api, plantuml, mermaid, open source — see the focus areas listed in its key facts.
Has 6 close alternatives in the same category on this page, so switching or comparing is easy.

Things to check

Free tools can change their model or shut down — avoid locking critical work into it without an export path.
Current plan prices are not listed here (they change too often to print reliably) — confirm the exact price on the official site.
It is one of 2328 tools in the Productivity & Notes category here — compare it against the alternatives below before you commit.

Derived from this listing's own data (pricing model, focus areas and category) — not a hands-on review score.

Kroki pricing

Pricing model	Free — listed in this directory as a free tool, with no paid plan required to use it.
Free access	Yes — fully free
Current plan prices	Listed on the official site — prices change, so this directory links out instead of printing a number that may already be stale.
Official site	kroki.io

Kroki key facts

Category: Productivity & Notes
Pricing: Free — listed in this directory as a free tool, with no paid plan required to use it.
Focus areas: diagrams, api, plantuml, mermaid, open source
Official site: kroki.io

Kroki FAQ

How much does Kroki cost?

Free — listed in this directory as a free tool, with no paid plan required to use it. Current plans and prices are listed on the official site (kroki.io).

What is Kroki used for?

Unified API that turns text descriptions into diagrams Its focus areas in the Productivity & Notes category: diagrams, api, plantuml, mermaid, open source.

Where can I try Kroki?

On its official site, kroki.io — the Visit Official Site button above goes straight there.

Kroki vs alternatives

	Kroki	Diagramming AI	DocuSeal	spurtCMS
Pricing	Free — listed in this directory as a free tool, with no paid plan required to use it.	Freemium — a free tier lets you start, and paid plans are available if you need more.	Freemium — a free tier lets you start, and paid plans are available if you need more.	Freemium — a free tier lets you start, and paid plans are available if you need more.
Focus areas	diagrams, api, plantuml, mermaid, open source	diagrams, mermaid, flowcharts, excalidraw	e signature, documents, open source, api	cms, headless, open source, api
Official site	kroki.io	diagrammingai.com	docuseal.co	spurtcms.com
Directory status	Listed	Listed	Listed	Listed

Side-by-side from each listing's own directory data. Full alternative cards are below.

About the Productivity & Notes category

Notes, tasks, and project tools that keep you organized and focused. The Productivity & Notes category on Tools Hub currently lists 2328 tools. Alongside Kroki, it includes TreeSheets, IOctopus, HMind, Klartab.

FreeProductivity & Notesdiagramsapiplantumlmermaidopen-source

Alternatives to Kroki

Tools in the same Productivity & Notes category that share focus areas with Kroki — worth comparing before you commit:

Productivity & Notes

Diagramming AI

Generate and edit Mermaid, PlantUML, GraphViz, D2 and Excalidraw diagrams from English

Freemiumdiagramsmermaidflowchartsexcalidraw

Productivity & Notes

DocuSeal

Open source document signing for everyone

Freemiume-signaturedocumentsopen-sourceapi

Productivity & Notes

spurtCMS

Open-source headless CMS with visual builder

Freemiumcmsheadlessopen-sourceapi

Productivity & Notes

ActivityWatch

Automatically track how you spend time on your devices, privately and free.

Freetime-trackingprivacyquantified-selfopen-source

Productivity & Notes

Admidio

Free membership management for organizations, clubs, and associations

Freemembershipself-hostedopen-sourceclubs

Productivity & Notes

AdventureLog

Travel log, trip planner, and world map in one app

Freetraveltrip-plannerself-hostedopen-source

More in Productivity & Notes

Comparing tools in the Productivity & Notes category? These related listings are worth a look: TreeSheets — Hierarchical spreadsheet for organizing complex information; IOctopus — Organic online mind mapping with real-time collaboration; HMind — Mind maps and outlines that work offline without an account.