Best for
Best for developers and teams that want to build native apps visually while keeping full ownership of the Flutter source code.
- Freelancers
- Small and mid-sized
- Enterprise
AI App Builders Comparison
FlutterFlow vs. OutSystems
At a glance
At a glance
Best for
Best for enterprise IT teams that want AI-generated applications inside a governed low-code platform with its own architecture guard rails.
- Enterprise
Cataleo does not name a winner. Both statements come from the vendors themselves.
Full Comparison
| Criterion | FlutterFlow | OutSystems |
|---|---|---|
| Starting price | Free plan; paid from $39 / month Billed per month; annual billing is about 25% cheaper. Higher tiers add per-seat pricing. | Free Personal Edition; OutSystems Developer Cloud quoted by the vendor ODC is metered on three things: application complexity in Application Objects, which is the sum of screens, database tables and API methods, with a typical medium app around 150 AOs; the number of internal and external end users; and advanced add-ons. A base subscription starts with one medium production application and 100 internal users. |
| Free trial | Free plan (AI Gen limited to 5 lifetime requests) | Free Personal Edition, no credit card required, for up to 100 internal users |
| Commercial use | Yes | Not stated |
| Output | Native iOS and Android apps and responsive web apps, with downloadable Flutter and Dart source code | Full-stack enterprise web and mobile applications with data model, server-side logic and UI screens |
| API | Not stated | Yes, API-first with CI/CD APIs and APIs for uploading external libraries |
| Hosting | Not stated | OutSystems Cloud on AWS; self-hosting is available as an advanced add-on |
| What it generates | Native iOS and Android apps plus responsive web apps, built from one project; screens and flows can be generated from a prompt with AI Gen | Full-stack enterprise applications: Mentor generates the data model, server-side logic and UI screens from a natural language prompt or an uploaded requirements document, shows a visual blueprint before building, and then evolves the app through conversation inside the IDE with human sign-off on each implementation plan |
| Stack and frameworks | Visual builder on top of Flutter; generates Flutter and Dart code you can download, with no vendor lock-in | .NET Core on Linux containers, each application isolated in its own container, orchestrated with Kubernetes on AWS; developers extend apps with custom .NET code uploaded as high-code external libraries, whose methods are exposed to the visual editor as server actions |
| Auth and database | Built-in Firebase and Supabase integrations for database and user authentication, plus REST and GraphQL API connections | Amazon Aurora Serverless with PostgreSQL compatibility as the managed database; ISO 27001 compliance is included and SOC 2 Type II and PCI DSS are advanced add-ons |
| Hosting and deploy | One-click deploy to the Apple App Store, Google Play and the web, with custom domain support | OutSystems Cloud with development, testing and production runtimes and a 99.5 percent uptime guarantee, upgradeable to 99.95 percent; extra runtimes and a self-hosted option are advanced add-ons. Built-in CI/CD pipelines with monitoring, tracing and logging |
| Payments | In-app payment integration available across all plans | No checkout of its own; payment providers are integrated through components from the OutSystems Forge, including Stripe connectors for both ODC and OutSystems 11 that handle charges, customers and refunds, and a payments plugin covering Apple Pay, Google Pay and Stripe |
| Access to the code | Full Flutter and Dart source code can be downloaded, or synced to GitHub on Growth and higher | Applications are built visually rather than in a repository of hand-written source; custom C# and .NET logic enters as external libraries uploaded through the SDK and APIs, decorated so their methods surface as server actions |
| Deployment | Cloud (SaaS), Browser-based | more entries Cloud (SaaS), Browser-based, On-premise |
| Support | more entries Email helpdesk, Chat, Community forum | Email helpdesk, Community forum |
| Onboarding | more entries Documentation and knowledge base, Video tutorials | Documentation and knowledge base |
| Company size | more entries Freelancers, Small and mid-sized, Enterprise | Enterprise |
| Integrations | Firebase, Cloud Firestore, Firebase Storage, Supabase, GitHub, Google Cloud, Google Maps, Google Analytics, Braintree, AdMob, Mux | Not stated |
Add a tool
Adds a column to the table, from the tools in this category.
Row where the values differ The small markers point at the lower number, the longer list or the stated feature. They describe the data, they are not a verdict.
The short version
Key Differences
- Starting price FlutterFlow Free plan; paid from $39 / month OutSystems Free Personal Edition; OutSystems Developer Cloud quoted by the vendor
- Free trial FlutterFlow Free plan (AI Gen limited to 5 lifetime requests) OutSystems Free Personal Edition, no credit card required, for up to 100 internal users
- Deployment FlutterFlow Cloud (SaaS), Browser-based OutSystems Cloud (SaaS), Browser-based, On-premise
- Company size FlutterFlow Freelancers, Small and mid-sized, Enterprise OutSystems Enterprise
- Support FlutterFlow Email helpdesk, Chat, Community forum OutSystems Email helpdesk, Community forum
Every line is one datapoint from the table above, picked automatically. Nothing here is written text.
The trade-offs
Strengths and Limitations
FlutterFlow
Strengths
- Exports the full Flutter and Dart source code, so there is no vendor lock-in
- Builds native iOS, Android and web apps from a single project
- Built-in Firebase and Supabase integrations for data and authentication
Limitations
- AI Gen requests are capped per plan (5 lifetime on the free plan, up to 500 per month on Business)
- Real-time collaboration and GitHub sync require the Growth plan or higher
OutSystems
Strengths
- Mentor generates a complete application, data model and server logic included, from a requirements document rather than only from a chat prompt
- Shows a visual blueprint and asks for sign-off before applying changes, instead of building unseen
- Runs on containerised .NET Core with Kubernetes, managed Aurora PostgreSQL and built-in CI/CD, monitoring and tracing
- Free Personal Edition for up to 100 internal users needs no credit card
- Self-hosting is available, unlike most tools in this category
Limitations
- No published prices at all, so every evaluation starts with a sales conversation
- Pricing is metered on Application Objects and user counts, which makes cost hard to predict as an app grows
- The Personal Edition is a development runtime only and cannot run production apps
- Self-hosting, 24x7 support, higher uptime and SOC 2 or PCI DSS compliance are all paid add-ons rather than part of the base subscription
- Base support is 8x5 business hours
Plans
Pricing
FlutterFlow
- Free $0
- Basic $39 / month
- Growth $80 / month
- Business $150 / month
OutSystems
- OutSystems Personal Edition $0 Free, no credit card required. Development runtime only, up to 100 internal users, hosted on OutSystems Cloud. For test applications, not production, and with no uptime guarantee or compliance options.
- OutSystems Developer Cloud Custom Quoted by the vendor, priced on application complexity in Application Objects, end user counts and add-ons. Includes development, testing and production runtimes, professional support 8x5, OutSystems Cloud hosting, a 99.5 percent uptime guarantee and ISO 27001. Starts with 100 internal users and one medium-sized application.
- Advanced add-ons Custom 24x7 professional support, additional non-production and production runtimes, a self-hosted option, a 99.95 percent uptime upgrade, SOC 2 Type II and PCI DSS compliance, and additional users or larger applications.
What users say
Review Scores · opens after launch
FlutterFlow
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.
OutSystems
- Ease of use
- Not rated yet
- User interface
- Not rated yet
- Onboarding
- Not rated yet
- Support and service
- Not rated yet
- Value for money
- Not rated yet
- Features
- Not rated yet
No reviews yet. Be the first to review this tool. Every review is checked for fairness before it appears, and the vendor cannot have one removed.
Where this comes from
Where this comes from
FlutterFlow https://www.flutterflow.io · checked against the official source on 2026-09-06
OutSystems https://www.outsystems.com · no check date recorded yet
This table lists factual criteria taken from information the vendors publish themselves. For how we put it together, see the methodology.