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Open-Source OutSystems Alternatives (2027): 10 Self-Hosted Low-Code Platforms for Apps, Mobile, Workflows and AI Agents, Checked for Licence and Activity

Open-Source OutSystems Alternatives: Low-Code Platforms You Can Run Yourself

OutSystems is one of the best-known enterprise low-code platforms, and in 2027 it sells itself as an agentic systems platform: web and mobile apps, workflows and AI agents, built with its AI developer Mentor and managed in one governed cloud. It is powerful, but it is closed source, the prices are only available from sales, and your apps live on OutSystems infrastructure. For a startup or a small IT team, an open-source low-code platform can cover a large part of the same ground with no licence fee, your own servers and your own data. We checked every platform below on its official website and GitHub repository in November 2026: the exact licence, the latest release, and which part of OutSystems it can really replace (mobile apps, workflows or AI features). Tools from the old list that are not open source, changed licence or stopped development have their own section at the end.
Quick answer: for business apps with workflows and AI agents, closest to OutSystems, choose Joget (GPLv3 Community Edition). For native mobile apps, choose Convertigo (AGPL-3.0, Android, iOS and PWA builds) or Saltcorn (MIT, web and mobile). For internal tools, choose Budibase, Appsmith or ToolJet; for data-heavy business systems, Frappe Framework or Corteza; for customer-facing apps, Lowcoder; and for a database with an app builder, Baserow.
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What OutSystems Offers in 2027

The OutSystems pricing page (checked November 2026) publishes no prices: it describes the OutSystems Agentic Systems Platform for building and running AI agents and apps, optional add-ons, and asks you to contact the team for a custom quote. The platform menu lists Mentor (AI-assisted development), Agent Workbench (AI agents), agentic workflows and a data fabric, and the OutSystems Developer Cloud documentation describes creating web, mobile and agentic apps. There is one free option: the OutSystems Personal Edition, announced on 30 September 2025 as a "forever free" space for personal projects and learning, with free access to Agent Workbench and 1GB of application data storage. It is meant for exploring and learning the platform, so a team that wants to run apps for real users is back to a sales quote. That is why founders look at open-source platforms: you pay for hosting and your own time instead of a licence.

Open-Source OutSystems Alternatives Compared

PlatformReplaces in OutSystemsLicenceLatest release (checked Nov 2026)Paid option
JogetBusiness process apps, workflows, AI agentsGPLv3 Community Edition; paid editions under EULA9.1.2, October 2026Professional and Enterprise editions
ConvertigoNative mobile and web appsAGPL-3.08.4.7, November 2026Starter EUR 15/user/month (first tier)
SaltcornDatabase apps for web and mobileMIT1.7.0 beta, November 2026None required
BudibaseInternal apps, automations, AI agentsGPLv3 overall; paid features BSL3.51.0, November 2026Cloud from $299/month
AppsmithInternal tools and admin panelsApache-2.02.6.0, October 2026Business $15/user/month
ToolJetInternal tools, workflows, agent builderAGPL-3.03.20.256 LTS, November 2026Cloud Basic $23/builder/month
Frappe FrameworkData-model-first business systemsMIT16.55.2, November 2026Frappe Cloud hosting
CortezaCRM and process apps (Salesforce-style)Apache-2.02026.9.0, October 2026Aire AI subscription; support from Planet Crust
LowcoderCustomer portals and external appsAGPL-3.0Renaissance, October 2026Enterprise edition
BaserowDatabase plus application builderMIT core (open-core)2.4.1, October 2026Premium $10/user/month
Sources: each project's official website, pricing page and GitHub or GitLab repository (LICENSE file and release feed), checked 9 November 2026.

Best Open-Source Platforms for Business Apps and Workflows

1. Joget: the closest open-source match for OutSystems

Joget describes itself as a unified, open-source agentic AI application platform to build, deploy, integrate and govern production-ready applications and AI agents. It combines a visual app builder with business process automation and workflow management, which makes it the closest open-source match for OutSystems' mix of apps, workflows and governance. The Joget source code says the Community Edition is licensed under GPLv3, while the Professional, Enterprise and Large Enterprise editions use a commercial licence. You can start free in Joget's cloud or install it on your own servers; releases 9.1.2 and 8.2.13 came out in October 2026.

2. Corteza: open-source CRM and process apps

Corteza calls itself the open-source Salesforce alternative: a low-code platform for CRM, business process and other structured data apps, with workflows and connections to almost any data source. It is fully open source under the Apache 2.0 licence, and release 2026.9.0 came out in October 2026. Planet Crust, which created it, sells support and Aire, an AI data model builder, as a subscription. Choose it if the OutSystems apps you plan are mostly customer records, cases and approval processes.

3. Frappe Framework: a low-code framework for whole business systems

Frappe Framework is the MIT-licensed, metadata-driven framework behind ERPNext. Each DocType is a database table, a form and a class at once, and you get an admin UI, roles and permissions, APIs, reports and workflows out of the box. It needs Python developers, but it scales to full ERP-style systems; version 16.55.2 came out in November 2026, and Frappe Cloud offers paid hosting. For accounting built on it, see our open-source Zoho Books alternatives.

Best Open-Source Platforms for Mobile Apps

4. Convertigo: native mobile apps, self-hosted

Convertigo is an open-source, AI-assisted platform that combines low-code and no-code studios for web, mobile and desktop apps, with connectors for REST, SOAP, SQL and OData. Its pricing page says the Community Edition is free and will always be: on premises, one environment, unlimited apps and Android APK, iOS IPA and PWA generation. Paid editions start with Starter at EUR 15 per internal user per month (first-tier price). The code is under AGPL-3.0, and version 8.4.7 came out on 9 November 2026.

5. Saltcorn: a small, MIT-licensed builder for web and mobile

Saltcorn is an open-source no-code database application builder for web and mobile apps, with a drag-and-drop view builder, a visual workflow editor and an AI copilot that drafts apps. It is MIT-licensed, self-hostable and has no licence fee; the free hosted service is only for exploring. Its homepage announces build 1.6.1, and 1.7.0 betas came out in November 2026. Mobile builds need a larger Docker image with the mobile dependencies.
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Best Open-Source Platforms for Internal Tools and AI Agents

6. Budibase: internal apps, automations and AI agents

Budibase builds internal apps, automations and AI agents for business processes. Its Community plan is free to self-host with unlimited users, apps, agents and automations; Budibase Cloud starts at $299 a month. The repository says Budibase is GPLv3 overall, with paid features under the Business Source License, so the free edition is open source and the extras are not. Version 3.51.0 came out in November 2026.

7. Appsmith: Apache-2.0 internal tools

Appsmith is an Apache-2.0 platform for internal tools: admin panels, dashboards and forms on top of databases and APIs, with JavaScript where you need it. The Appsmith pricing page offers a free cloud plan for up to 5 users and a free open-source Community edition; Business ($15 per user per month) adds workflows, audit logs and custom roles, and Enterprise is $2,500 a month for 100 users. Version 2.6.0 came out on 28 October 2026.

8. ToolJet: internal tools with a self-hosted agent builder

ToolJet is an AGPL-3.0 platform with an AI app builder, a visual app builder and a built-in database. Its pricing page lists workflows and the agent builder as available on self-hosted deployments only, and ToolJet can run on your own infrastructure starting with the free Community Edition. The cloud Free plan allows 2 builders, 50 end users and 10 apps. Version 3.20.256 LTS came out on 6 November 2026.

9. Lowcoder: open source for customer-facing apps

Lowcoder builds internal tools and apps for people outside your company: dashboards, customer portals, public forms and websites, with 120+ components and 60+ data sources. Its README says it continues the abandoned Openblocks project, under AGPL-3.0, and the latest release, Renaissance, came out in October 2026. Choose it when your OutSystems use case is an external portal rather than an internal tool.

10. Baserow: a database first, apps on top

Baserow is an open-source no-code database with an application builder, automations and dashboards that you can self-host. The core is MIT-licensed, with premium and enterprise folders under their own licences; release 2.4.1 came out in October 2026. The Baserow pricing page also offers a free cloud plan with 3,000 rows, 2GB and 500 external app users per workspace, and Premium at $10 per user per month. It replaces OutSystems for data-centred apps such as trackers, portals and simple CRMs.

OutSystems Alternatives That Are Not Open Source or Changed

Several tools from the 2025 version of this list, or often called open-source OutSystems alternatives, did not pass our licence and activity check:
  • UI Bakery: offers a self-hosted edition, but no open-source licence.
  • NocoDB: its LICENSE file is now the Sustainable Use License, which is source-available, not open source.
  • NocoBase: its LICENSE file (updated 24 February 2026) is the company's own NocoBase License Agreement with commercial terms, not a standard open-source licence.
  • Directus: licensed under the Monospace Sustainable Core License, which is source-available.
  • Dify: uses a modified Apache 2.0 licence with extra conditions on multi-tenant use and logos, so it is not OSI open source; it is an AI app platform rather than a low-code app builder. For AI tools, see our open-source ChatGPT alternatives.
  • Openblocks: last release in March 2023; Lowcoder continues the project.
  • ILLA Builder: last release in August 2024, so we treat it as inactive.
  • Node-RED: still open source and active, but it is a flow-based tool for connecting devices, APIs and services, not an app builder. For automation, see our open-source Zapier alternatives and free Make alternatives.

Which Open-Source OutSystems Alternative Should You Choose?

  • Process apps with approvals, governance and AI agents: Joget.
  • Native mobile apps for field teams: Convertigo, or Saltcorn for a lighter MIT option.
  • Internal tools on your databases and APIs: Appsmith, ToolJet or Budibase.
  • A CRM or case management system: Corteza.
  • A full ERP-style system built by developers: Frappe Framework.
  • Customer portals and external apps: Lowcoder.
  • Data-centred apps that start as a spreadsheet: Baserow.
Comparing more platforms? Our open-source Mendix alternatives cover model-driven enterprise platforms such as Jmix and Skyve, our open-source Retool alternatives cover admin panel builders, and our open-source AppSheet alternatives cover spreadsheet-style apps. If you would rather not host anything, see the free AppSheet alternatives, free Bubble alternatives and free Glide alternatives with real free plans.
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How Founders Use Open-Source Low-Code Platforms

Founders use these platforms to ship the boring but critical software around their product: client onboarding, approvals, back-office dashboards and partner portals. Start with one process, run it on a small server, and only add workflows and AI agents when people use the app every day. Our article on future-proof features every no-code or low-code platform needs is a good checklist, and the biggest mistakes when choosing no-code tools explains how to avoid lock-in. If you are weighing low-code against AI coding, read is AI coding faster than low-code and low-code vs AI-code prototyping tools. For AI agents inside your business, see our guide to AI agents for startup founders and the open-source Salesforce Einstein alternatives. For your data layer, the open-source Airtable alternatives and open-source Notion alternatives are worth a look.
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FAQ About Open-Source OutSystems Alternatives

Is there an open-source version of OutSystems?

No. OutSystems is closed source. Its free option is the Personal Edition, a "forever free" space for personal projects and learning with 1GB of application data storage and access to Agent Workbench.

How much does OutSystems cost in 2027?

OutSystems publishes no prices. Its pricing page asks you to contact the team for a custom quote for the Agentic Systems Platform and add-ons (checked November 2026).

What is the best open-source alternative to OutSystems?

Joget is the closest match: its GPLv3 Community Edition combines app building, workflow management and AI agents with governance. For mobile apps, Convertigo is the strongest open-source option.

Which open-source low-code platform builds native mobile apps?

Convertigo's free Community Edition generates Android APK, iOS IPA and PWA builds, and Saltcorn builds web and mobile database apps under the MIT licence.

Is Budibase open source?

Budibase is GPLv3 overall, and its free Community plan can be self-hosted with unlimited users, apps, agents and automations. Paid features sit in a separate package under the Business Source License.

Is NocoBase open source?

Not by the standard definition. Since February 2026 its LICENSE file is the NocoBase License Agreement, the company's own terms. The Community Edition is still free to use under those terms.

Is Directus open source?

No. Directus uses the Monospace Sustainable Core License, a source-available licence.

What happened to Openblocks and ILLA Builder?

Openblocks has had no release since March 2023, and Lowcoder continues the project under AGPL-3.0. ILLA Builder's last release was in August 2024.

Can I replace OutSystems AI agents with open source?

Partly. Joget, Budibase and ToolJet (self-hosted) include AI agent features, and Saltcorn has an AI copilot for building apps. Check the edition you plan to use, because some AI features are in paid tiers.

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You can publish a guest post in one of the Fe/male Switch startup blogs, which rank in Google and in AI tools. Get a quality backlink.

About the Author

Violetta Bonenkamp, also known as MeanCEO, is an experienced startup founder with an impressive educational background including an MBA and four other higher education degrees. She has over 20 years of work experience across multiple countries, including 5 years as a solopreneur and serial entrepreneur. Throughout her startup experience she has applied for multiple startup grants at the EU level, in the Netherlands and Malta, and her startups received quite a few of those. She’s been living, studying and working in many countries around the globe and her extensive multicultural experience has influenced her immensely.
2026-11-09 21:03 Top Alternatives