Appian alternatives · Automation
Open-source alternatives to Appian
Appian is not described as open source on its own site. 27 of the 134 other automation tools in this directory are open source, according to their own sites.
Appian's current pricing could not be confirmed from its own site. 25 of them are free or have a free plan.
27 tools · Listings checked up to Nov 13, 2026 · Where the facts come from
The 12 closest to Appian
- Paid
Flowable
Case and process platform with governed AI agents, on open standards
- Appian has a free plan. Flowable does not.
- Flowable is open source, according to its own site.
- Flowable also covers diagrams.
- Appian also covers app builder and no-code.
- Free plan · from $29/mo
Skyvern
Open-source AI agents that automate workflows in the browser
- Skyvern is open source and self-hostable, according to its own site.
- Appian also covers app builder and case management.
- Free plan · from $10/mo
Windmill
Open-source platform for scripts, workflows and internal apps
- Windmill is open source and self-hostable, according to its own site.
- Appian also covers no-code and case management.
- Free plan · from $16/mo
Activepieces
Open-source automation with flows, AI agents and tables
- Activepieces is open source and self-hostable, according to its own site.
- Activepieces also covers databases.
- Appian also covers app builder, no-code and case management.
- Free plan · from $10/mo
Trigger.dev
Open-source platform for long-running background tasks and AI agents
- Trigger.dev is open source and self-hostable, according to its own site.
- Appian also covers app builder, no-code and case management.
- Free plan · from $99/mo
Inngest
Durable execution for background jobs, event-driven apps and agents
- Inngest is open source, according to its own site.
- Appian also covers app builder, no-code and case management.
- Free
Automatisch
Open-source workflow automation you can host yourself
- Automatisch is open source and self-hostable, according to its own site.
- Appian also covers AI agents, app builder and case management.
- Free plan · from $100/mo
Prefect
Python workflow orchestration with an open-source core and a cloud
- Prefect is open source and self-hostable, according to its own site.
- Appian also covers app builder, no-code and case management.
- Free plan · from $0
Hatchet
Open-source task queue and durable workflow engine
- Hatchet is open source and self-hostable, according to its own site.
- Hatchet also covers job scheduling.
- Appian also covers app builder, no-code and case management.
- Free plan · from $75/mo
Restate
Durable execution runtime for backends and AI agents
- Restate is open source and self-hostable, according to its own site.
- Appian also covers app builder, no-code and case management.
- Free plan · from $50/mo
Nango
Integration infrastructure for products and AI agents
- Nango is open source and self-hostable, according to its own site.
- Appian also covers app builder, no-code and case management.
- Free plan · from €99/mo
Knime
Open-source visual workflows for data analysis and automation
- Only Knime lists Windows, macOS and Linux apps.
- Knime is open source, according to its own site.
- Appian also covers AI agents, app builder and case management.
Common questions
Is there an open-source alternative to Appian?
Yes. Flowable, Skyvern, Windmill, Activepieces, Trigger.dev, Inngest, Automatisch, Prefect and 19 more are open source, according to their own sites.
Is Appian open source?
Appian is not described as open source on its own site. The listing was checked on Nov 12, 2026 against the pages it cites.
Which of these automation tools are free?
Skyvern, Windmill, Activepieces, Trigger.dev, Inngest, Automatisch, Prefect, Hatchet and 17 more are free or have a free plan.
When was this checked?
Each listing shows its own date. On this page they run from Oct 5, 2026 to Nov 13, 2026. Vendors change prices and plans without notice, so confirm on their site before you buy.
This page is built from the listings. A tool is here because its listing says so, and the order is how close each is to Appian: the alternatives its listing names first, then the tools that share the most features with it.