Best Diagram Software in 2026
Updated
In short: Cacoo is ranked #1 of 37 as of 4 October 2026, ahead of Eraser and Creately. The best-ranked option with a free plan is Eraser. The lowest first paid tier on this page is Visual Paradigm at $4/mo.
Whether you’re mapping a process, sketching a system, or explaining an idea, diagram software needs to fit the way you work and share. Compared on desktop app availability, diagram types, import and export formats, maximum editors, real-time collaboration, and version history, these options cover practical differences in creating and maintaining diagrams. Cacoo, Eraser, and Creately are among the named tools to weigh against your workflow; check format support for compatibility with the files you use and editor limits for shared work. Free plans and paid-from pricing round out the comparison, helping you assess access and cost alongside the capabilities your diagrams require.
37 diagram software ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Diagram Software, one module each. A lit port is something its maker publishes; 5 of the 25 on this page have a public API.
- 01 Cacoo API yesOSS not on recordFREE yesDOCS 7.4$6/mo
- 02 Eraser API yesOSS not on recordFREE yesDOCS 7.3$15/mo
- 03 Creately API yesOSS not on recordFREE yesDOCS 7.2Free
- 04 Lucidchart API yesOSS not on recordFREE yesDOCS 7.2$9/mo
- 05 draw.io API not on recordOSS yesFREE yesDOCS 6.7Free
- 06 Astah Professional API yesOSS not on recordFREE not on recordDOCS 6.6
- 07 Visual Paradigm API not on recordOSS not on recordFREE yesDOCS 6.0$4/mo
- 08 EdrawMax API not on recordOSS not on recordFREE yesDOCS 5.9$5.90/mo
- 09 Microsoft Visio API not on recordOSS not on recordFREE yesDOCS 5.9$5/mo
- 10 Bizagi Modeler API not on recordOSS not on recordFREE yesDOCS 5.8Free
- 11 Buddi API not on recordOSS not on recordFREE yesDOCS 5.8Free
- 12 ProcessOn API not on recordOSS not on recordFREE yesDOCS 5.8Free
- 13 IcePanel API not on recordOSS not on recordFREE yesDOCS 5.7$40/mo
- 14 Sparx Enterprise Architect API not on recordOSS not on recordFREE not on recordDOCS 5.5
- 15 Structurizr API not on recordOSS not on recordFREE not on recordDOCS 5.4£300/mo
- 16 SmartDraw API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 17 yEd Graph Editor API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 18 Archi API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 19 ConceptDraw DIAGRAM API not on recordOSS not on recordFREE not on recordDOCS 5.1$199/mo
- 20 ConceptDraw MINDMAP API not on recordOSS not on recordFREE not on recordDOCS 5.1$199/mo
- 21 Dia API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 22 Diagram Designer API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 23 Hava API not on recordOSS not on recordFREE not on recordDOCS 5.1$59/mo
- 24 Holori API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 25 Modelio API not on recordOSS not on recordFREE not on recordDOCS 5.1
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which diagram software is ranked first on Inferse?
Cacoo is ranked #1 of 37 with a score of 7.4. Eraser is second and Creately third.
How many of these have a free plan?
11 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Visual Paradigm has the lowest first paid tier we found: $4/mo.
How is this list ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it. Paid placements never change a rank.