Build your workflow app in days, not months
Open Source Workflow Builder – Apache 2.0 React SDK + Reference Backend
Open source Workflow Builder under Apache 2.0. React SDK + reference back-end + Temporal adapter, free on GitHub. Commercial use OK, no copyleft, no relicensing.
What is open source vs what is Enterprise
The full three-block stack is in Community Edition
Apache 2.0 covers the visual workflow editor, the reference back-end, and the Temporal adapter. You can ship a complete workflow product on Community alone. Enterprise adds premium components on top.
| Component | Community (Apache 2.0) | Enterprise (EUR 6,990) |
|---|---|---|
| Visual workflow editor (React SDK on NPM) | Yes | Yes |
| Reference back-end (HTTP API + graph runner) | Yes | Yes |
| Temporal integration adapter | Yes | Yes |
| Three port interfaces (engine-agnostic) | Yes | Yes |
| Full source code on public GitHub | Yes | Yes |
| Community support (GitHub issues) | Yes | Yes |
| Commercial use, no royalty | Yes | Yes |
| Figma Kit | No | Yes |
| Advanced canvas plugins (ELK auto-layout, smart edge routing, edge reshaping) | No | Yes |
| Priority GitHub issues | No | Yes |
| Enterprise SLA (on-demand, terms negotiated individually) | No | Yes |
License comparison vs alternatives
Workflow tools and their license footprint
Open source means different things to different vendors. Workflow Builder Community is Apache 2.0 on public GitHub with no copyleft. Here is how that compares.
| Vendor | License | Commercial use | Notes |
|---|---|---|---|
| Workflow Builder Community | Apache 2.0 | Yes, no royalty | Public GitHub, no copyleft, perpetual |
| n8n | Sustainable Use License | Restricted | Formally NOT open source; embed/enterprise tier est. ~$50,000/yr (community estimate) |
| Camunda Community | Limited OSS | Restricted | Camunda 8 Self-Managed requires commercial license |
| GoJS | Commercial | License purchase | $3,995-$11,950 per developer (source) |
| JointJS Plus | Commercial | License purchase | from $3,490 per developer, perpetual (source) |
| React Flow | MIT | Yes | Comparable liberal license - WB is built on it |
| Temporal | MIT | Yes | Comparable liberal license for self-hosting |
| Inngest | Dual | Mixed | Apache 2.0 client SDK + commercial cloud platform |
| Conductor OSS | Apache 2.0 | Yes | Comparable liberal license |
| Flowable | Apache 2.0 | Yes | Comparable liberal license |
License footprint as of 2026-05. Each vendor's license terms are subject to change - we link to canonical pages above for verification.
Why Apache 2.0 matters
Three reasons the license you pick is a load-bearing decision
Commercial use, no royalty
You can take Workflow Builder Community, build a SaaS product on top, and sell it to customers. No revenue share. No commercial license required. The reference back-end, Visual workflow editor, and Temporal adapter are all yours to ship commercially.
No copyleft, protect your IP
Apache 2.0 is permissive. Modify Workflow Builder, ship the modified version in your closed-source product, and you do not have to publish your changes. No GPL-style derivative work clause. Your code stays your code.
Vendor lock-in protection
Even if Synergy Codes disappears tomorrow (unlikely after 15 years in the industry, but humor us), you have the full source under Apache 2.0, perpetually. You can fork, run, modify, and ship without depending on any vendor service. The engine adapters are swappable - no lock-in to Temporal either.
Public repo, public releases, public roadmap
Workflow Builder is developed in the open at github.com/synergycodes/workflowbuilder.
Star us, file issues, send PRs, follow releases.
Live data from GitHub. Refreshes every few minutes.
Built on
Built on shoulders of giants - every dependency is OSS-permissive
Every dependency in our stack is permissively licensed and battle-tested. No SaaS-only black boxes in the critical path - if any library disappears tomorrow, you can fork it.
React Flow (xyflow)
Canvas foundation.
We contribute upstream.
Temporal
Reference durable execution engine.
ELK
Auto-layout algorithm.
libavoid
Edge routing without overlaps.
Hono
Back-end HTTP framework.
React
UI framework.
TypeScript
Type system.
CASE STUDIES
Open source FAQ
Questions developers ask before they clone
- Is the reference back-end also open source?
Yes. The reference back-end is part of Community Edition under Apache 2.0. Full source code on github.com/synergycodes/workflowbuilder, including the Temporal integration adapter, the three port interfaces, and the docker compose dev environment. See what is in the reference stack →
- Can I sell a product built on Workflow Builder Community Edition?
Yes. Apache 2.0 allows commercial use. You can build and sell a SaaS product on top of Workflow Builder Community Edition with no royalty, no revenue share, no commercial license needed. Many enterprise customers run Community Edition and never upgrade to Enterprise.
- Do I need a commercial license to use Workflow Builder in a commercial product?
No. Apache 2.0 covers commercial use. The Enterprise license is optional and adds Enterprise-only components (Flow Runner plugin, Figma Kit, advanced canvas plugins) - it is not a requirement for commercial use of Community Edition. See pricing for comparison →
- What is the difference between Community Edition and Enterprise Edition?
Community Edition (Apache 2.0, free) includes the visual workflow editor, reference back-end, Temporal adapter, three port interfaces, and full source on GitHub. Enterprise Edition (EUR 6,990 one-time) adds source code access to Enterprise-only components, Flow Runner plugin, Figma Kit, advanced canvas plugins (ELK auto-layout, smart edge routing, edge reshaping), and priority GitHub issues.
- Will Apache 2.0 ever change to BSL or SSPL?
No. Apache 2.0 is our hard commit. We watched the MongoDB SSPL, Elastic SSPL, HashiCorp BSL, and Redis SAL relicensing events. Workflow Builder Community Edition stays Apache 2.0. The source code in the GitHub repo is yours under that license, perpetually. If you have already cloned a Community release, no future change affects that copy.
- What is no copyleft?
Apache 2.0 is a permissive license. You can modify Workflow Builder and ship the modified version in your closed-source product without publishing your changes. No GPL-style requirement to release your derivative work. Your IP stays your IP.