Gleek

Browser-based text-to-diagram tool for flowcharts, UML and ER diagrams, typed with the keyboard.

Verified facts: 4 of 4
Alternatives ranked: 4
Approved reviews: 0
Visits sent from here: 0

About Gleek

Gleek is a small online tool for people who would rather type than drag shapes. You write descriptions in its own short syntax and it draws informal diagrams, flowcharts, UML class, sequence and state diagrams, Gantt charts, user journeys and entity-relationship diagrams (in Chen or crow's foot notation) as you go. An AI chat can generate or edit diagrams from plain-language requests on paid plans. The free plan is generous enough to try it but limits you to a handful of files and a few dozen objects per diagram, shows ads, exports only PNG and stores diagrams in your browser rather than the cloud. Premium plans are priced in euros, with a per-activity option and team and student plans, and there is no free trial. Gleek is quicker to learn than PlantUML and needs no installation, but it is a niche indie tool with a smaller feature set and community.

Best for: Developers and analysts who want quick text-typed diagrams in the browser.

What works

Keyboard-only workflow, no dragging
Supports flowcharts, UML and ER diagrams
Nothing to install
Inexpensive premium plans

Why people leave

Free plan limited to 5 files and 40 objects
Free diagrams are stored only in the browser
Smaller community and fewer integrations

Top Gleek alternatives

See all 4

1
Mermaid
Free and open source, with diagrams that render natively on GitHub.
66.5
2
PlantUML
Deeper UML support and self-hosting, for free.
62.6
3
dbdiagram.io
Specialised text-to-ERD tool if database diagrams are your main use.
59.6
4
D2
Open-source diagram language with an offline CLI and polished output.
57.2

Why people left Gleek

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Gleek: common questions

Is Gleek free?

Gleek has a free plan and paid plans. Free plan limits: 5 diagram files, 40 objects (checked on Gleek's own site).

Is Gleek open source?

No, Gleek is not open source. Open-source alternatives include Mermaid, PlantUML and D2.

What platforms does Gleek run on?

Gleek is available for Web.

What are the best alternatives to Gleek?

The highest-ranked Gleek alternatives right now are Mermaid, PlantUML and dbdiagram.io. See the full ranked list for pricing, platforms and verified facts.

See all 4 Gleek alternatives

Gleek facts

4 of 4 verified

Free plan limits: 5 diagram files, 40 objects; Checked Oct 25, 2026gleek.io(opens source in a new tab); “only 5 diagram files in Free plan) Unlimited number of diagram objects (only 40 diagram objects in Free plan”
Premium price: €6.95 per month; Checked Oct 25, 2026gleek.io(opens source in a new tab); “The Premium Monthly and Team plans cost €6.95/month, Premium Per-Activity costs €10.99/month.”
Free trial: None; Checked Oct 25, 2026gleek.io(opens source in a new tab); “No, we do not offer a Free Trial.”
Input: Text in Gleek's own syntax; Checked Oct 25, 2026gleek.io(opens source in a new tab); “Gleek is a text-to-diagram tool that turns descriptions (in its own unique syntax) into diagrams”