Alternatives · App Builders
OutSystems alternatives
As of Nov 13, 2026, the highest-graded OutSystems alternative is Appsmith (2.8 GPA). It's also the best free one.
OutSystems compared with 5 alternatives: Mendix, Appsmith, Retool, Superblocks and Bubble.
OutSystems has a free plan. 4 of the 5 alternatives are free or have a free plan. One more offers a free trial.
Listings checked up to Nov 13, 2026 · Where the facts come from
Black Friday: is there a OutSystems sale?
At a glance
| Tool | Price | Free plan | Runs on |
|---|---|---|---|
| OutSystemsThis tool | Free plan | Yes | Web |
| Mendix | Free plan · from €918/mo | Yes | Web, Windows |
| Appsmith | Free plan · from $15/mo | Yes | Web |
| Retool | Free plan · from $10/mo | Yes | Web |
| Superblocks | Free trial · from $100/mo | Trial only | Web |
| Bubble | Free plan · from $32/mo | Yes | Web |
How each one differs from OutSystems
Mendix
Enterprise low-code platform for business applications
- Mendix starts at €918 per month and up for One App (euros as displayed; billing basis not stated).
- Mendix also lists a Windows app.
- Mendix does not cover AI agents, which OutSystems does.
Suits: Enterprises building business apps across departments
Appsmith
Open-source low-code platform for internal apps
- Appsmith starts at $15 per user / month.
- Appsmith is open source, according to its own site.
- Appsmith does not cover AI agents, which OutSystems does.
Suits: Developer teams building internal tools and admin panels
Retool
Platform for building internal apps, workflows and AI agents
- Retool starts at $10 per builder / month, billed annually (plus $5 per internal user).
- Retool also covers workflow automation and no-code.
Suits: Companies building internal tools on their own databases
Superblocks
Governed platform for AI-built internal apps and agents
- Superblocks starts at $100 per month for up to 15 builders, billed annually ($125 billed monthly).
- Superblocks has no free plan, only a free trial, unlike OutSystems.
Suits: IT and security teams that want to govern apps built with AI
Bubble
No-code visual builder for web and native mobile apps, with AI
- Bubble starts at $32 per month, billed annually (Starter, web only); $39 billed monthly.
- Bubble also covers no-code.
- Bubble does not cover AI agents, which OutSystems does.
Suits: Founders building a full web app or marketplace without writing code
Limits worth knowing in OutSystems
- No subscription prices are published; pricing is a custom quote based on Application Objects, end users and add-ons.
- The Personal Edition has a development runtime only, so it is for learning, not for running production apps.
- 24x7 support, 99.95% uptime, SOC 2 Type II and PCI DSS compliance, and extra runtimes are paid add-ons.
- Self-hosting is only available in certain plans.
Common questions
What are the alternatives to OutSystems?
The alternatives to OutSystems in this directory are Mendix, Appsmith, Retool, Superblocks and Bubble. Each one has a side-by-side comparison with OutSystems.
Is there a free alternative to OutSystems?
Yes. Mendix, Appsmith, Retool and Bubble have a free plan alongside paid ones.
Which OutSystems alternatives work on Windows?
The OutSystems listing does not include a Windows app. Mendix lists one.
Is there an open-source alternative to OutSystems?
Appsmith is described as open source on its own site.
When were these prices checked?
Each listing shows its own date. On this page they run from Nov 2, 2026 to Nov 13, 2026. Vendors change prices without notice, so confirm on their site before you buy.