Open Source Appian Alternatives
A curated collection of the 3 best open source alternatives to Appian.
The best open source alternative to Appian is AppSmith. If that doesn't suit you, we've compiled a ranked list of other open source Appian alternatives to help you find a suitable replacement. Other interesting open source alternatives to Appian are: Structr and Convertigo.
Appian alternatives are mainly Frameworks & Platforms but may also be Integration Platforms. Browse these if you want a narrower list of alternatives or looking for a specific functionality of Appian.
Low-code platform for building internal tools such as dashboards, admin panels and customer 360 views, then deploying and maintaining them.
Organizations build dashboards, admin panels, customer 360 screens, IT automation and service management tools so their teams work more efficiently, and each one turns into a small bespoke application somebody has to keep alive. Appsmith is an open-source low-code platform that takes on the development, deployment and maintenance of exactly that class of software.
Appsmith Agents extends the same idea into agentic AI, connecting current models to private and proprietary data inside the systems teams already use every day. It targets knowledge workers in sales, support, customer success and human resources, who can ask questions and configure automations for their own business without model fine-tuning or a retrieval pipeline to build first.
Around the builder sits the material that gets a team productive.
- Templates: a library of prebuilt applications to start from instead of an empty canvas.
- Docker install: the recommended self-hosted route, documented end to end.
- Kubernetes and AWS: guides for a cluster deployment or an AWS machine image, with further options in the installation docs.
- Documentation and tutorials: setup guides, step-by-step tutorials and a video channel.
- Community support: a Discord server, a community portal and a support address for questions.
Two starting points exist, a signup on the hosted cloud or an install on your own machine, and a local development setup is documented for anyone who wants to contribute code. Appsmith fits teams that keep writing the same internal admin screens and would rather run one platform than a pile of one-off apps.
Low-code platform where an application's schema, interface, scripts and data all live in one graph database, for teams building custom systems.
Structr stores an application's schema, UI definitions, templates, scripts and workflows in the same graph database as the records they operate on. It is a generic development and runtime platform, not a prebuilt CMS or CRM, and it removes the split between a source tree, a schema migration and the data underneath.
Development happens in a web-based developer and administration interface instead of a raw code tree. Types, properties and relationships are modeled in a schema editor, pages are assembled from templates and repeaters bound to graph queries, and logic is written as methods and function properties. GraalVM makes the scripting polyglot, and schemas import and export as JSON Schema.
Around that graph sit the operational pieces an application needs.
- Virtual filesystem: files and binary content with custom metadata, optionally on S3 compatible storage.
- Access control: users, groups, role-based and resource-based permissions, REST scoping and CORS.
- Graph exploration: a visual browser, Cypher execution and interactive inspection of nodes and relationships.
- Workflows: a node-based flow editor for orchestration logic, with inspection of results.
- Integration: REST and JSON APIs, AMQP, Kafka, Pulsar, XMPP, SMTP and IMAP mail, OAuth and LDAP identity.
- AI access: MCP support, so agents work through explicit schemas and defined APIs rather than loose code.
The backend is Java on GraalVM JDK 25 over Neo4j 4.4 or later, deployable as a monolith or in containers under Docker, Podman or Kubernetes. Licensing is dual: AGPL v3 or GPL v3 for open source use, with a commercial license, support and EU-based hosting from Structr GmbH.
Low code and no code platform for building enterprise web and mobile apps with a back end server, IDE and app builder.
Convertigo is a full stack low code and no code platform for building business applications together with the back end they run against. It exists so a team can assemble a cross-platform enterprise app without hand writing the connector, synchronization and delivery layers underneath it.
The Community Edition is not one application but a set of parts, each aimed at a different person on the team, and the server can be installed in more than one shape.
- Convertigo Server: the back end running connectors, micro-services and offline device synchronization, and serving web, mobile and PWA apps.
- Convertigo Studio: an Eclipse based IDE for Windows and macOS where micro-service workflows are programmed and the Mobile Builder assembles interfaces in low code mode.
- No Code Studio: a browser based builder for form driven web apps and PWAs, aimed at citizen developers rather than programmers.
- Container install: the server runs directly from Docker Hub images or through a published Helm chart.
- Servlet install: releases also ship as a Tomcat WAR file for an existing application server.
Convertigo states that more than 150,000 developers worldwide use the platform to build enterprise class web and mobile apps. The Community Edition is AGPL based and comes from Convertigo SA, which makes it a fit for an organization that wants a back end as a service it can run on its own premises rather than a hosted app builder.
