Can I open-source Gleek?
YES · mature open-source replacementYes. Excalidraw (129k stars), draw.io (43k stars), Mermaid Live Editor (7k stars) are mature open-source replacements for Gleek — self-host in one command and stop paying.
Gleek: The shapes are easy; customers pay for low-friction editing, reliable exports, collaboration, and a canvas that never fights them.
xmultiplayer cursors and comments
xlarge template libraries
xhigh-fidelity import and export
xpresentation and enterprise controls
These projects already replace it, free.
MMermaid Live EditorType Mermaid, see the diagram immediately, and export it; narrower than Gleek, but finished, free, and pleasantly uncomplicated.open source↗PPlantUML ServerA usable browser editor for architecture, sequence, process, and data-model diagrams written as text; the syntax is less forgiving than Gleek's.open source↗EExcalidrawVirtual hand-drawn style whiteboard for sketching diagrams collaborativelyopen source↗What each one is, in full: Excalidraw
all 4 open-source alternatives to Gleek →· no votes, no pay-to-list · just what's real
Gleek pricing
| plan | monthly | annual (per mo) | what you get |
|---|---|---|---|
| free | $0 | $0 | 5 files; 40 objects/file; PNG export only; local-browser storage; no AI |
| premium monthly | $8.02 | — | Unlimited diagrams and objects; premium export/collaboration features |
| premium per activity | $12.68 | — | Unlimited premium access only in months when the account is used |
| premium yearly | — | $5.62 | Unlimited diagrams and objects; premium export/collaboration features |
| teams | $8.02/user | — | Minimum 2 users; team collaboration and centralized billing |
free tier5 files; 40 objects/file; PNG only; local-browser storage; no AI
billingmonthly + per-active-month + annual; Teams monthly with 2-seat minimum
hidden costsThe per-activity plan charges €10.99 upfront for each month in which it is used, then freezes unused time. Teams has a 2-user minimum. Students and teachers can request a 50% discount.
verified 2026-08-12 · source ↗
Can I open-source Gleek?
Yes. Mermaid Live Editor replaces Gleek today — self-host it on your own server or machine with no subscription. The full list of open-source alternatives is on this page.
How much does Gleek cost?
Gleek's pricing is usage-based or varies by plan · The official pricing URL is recorded, but a stable current amount was not safely recoverable in this pass. Do not publish a number until rechecked..
What do I lose by replacing Gleek?
Honestly: multiplayer cursors and comments; large template libraries; high-fidelity import and export; presentation and enterprise controls. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to Gleek?
Yes: Mermaid Live Editor (Type Mermaid, see the diagram immediately, and export it; narrower than Gleek, but finished, free, and pleasantly uncomplicated.) PlantUML Server (A usable browser editor for architecture, sequence, process, and data-model diagrams written as text; the syntax is less forgiving than Gleek's.) Excalidraw (Virtual hand-drawn style whiteboard for sketching diagrams collaboratively) All 4 curated open-source alternatives are at caniopensourceit.online/gleek/alternatives.