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        <span class="eyebrow">Open source · LGPL v3 · Code-first</span>
        <h1>Code-first low-code platform for complex business applications</h1>
        <p class="lead">lsFusion reduces application boilerplate without hiding the code. Describe data, business rules and interfaces in one declarative language; let the platform handle persistence, queries, reactive updates and UI generation.</p>
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            <a class="btn" href="/try">Try lsFusion online</a>
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        <h2 id="low-code-difference">Low-code for developers, not a closed visual builder</h2>
        <p class="section-intro">The “low-code” part is the amount of infrastructure the platform derives from a compact model. The application itself remains explicit, versionable source code that a development team can review, test and extend.</p>
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            <article class="landing-card">
                <h3>One declarative model</h3>
                <p>Classes, stored and calculated data, actions, constraints and forms are described in the same language. Changes in the model propagate through the application instead of being repeated across layers.</p>
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            <article class="landing-card">
                <h3>Data processing without an ORM boundary</h3>
                <p>Set-oriented logic can be translated into optimized database queries. Developers work with business meaning while lsFusion decides how to execute operations on the application or database server.</p>
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                <h3>Generated, reactive interfaces</h3>
                <p>Forms can combine editable and calculated data. The platform keeps values and interface state synchronized when data changes, reducing manual client-server plumbing.</p>
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            <h2 id="declarative-example">A business model that becomes an application</h2>
            <p>This small lsFusion module declares a business object, two properties and a form. The same model can then grow with calculations, constraints, events, reports, security rules and integrations.</p>
            <p><a href="https://docs.lsfusion.org/Examples/" target="_blank">Explore more lsFusion examples</a> or compare the platform’s <a href="/features">full feature set</a>.</p>
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        <pre><code>CLASS Order 'Order';

isPosted 'Completed' = DATA BOOLEAN (Order);
number 'Number' = DATA INTEGER (Order);

FORM orders
    OBJECTS o = Order
    PROPERTIES(o) READONLY isPosted, number
;</code></pre>
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            <li><strong>Platform and IDE source are available.</strong> Your developers can inspect platform behavior, propose changes and build a customized version when required.</li>
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            <li><strong>You choose the application environment.</strong> lsFusion applications can run on infrastructure you control, with direct access to operational diagnostics and the database.</li>
            <li><strong>Extensions are not a dead end.</strong> Java interoperability, SQL access and integration mechanisms cover cases that should not be forced into a visual component model.</li>
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        <h2 id="use-cases">Where lsFusion fits best</h2>
        <p class="section-intro">The platform is aimed at transactional, data-intensive systems where business rules evolve and the cost of maintaining duplicated logic grows quickly.</p>
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                <h3>ERP and operations</h3>
                <p>Orders, pricing, inventory, purchasing, finance, approvals and other connected processes with many calculations and constraints. See the dedicated <a href="/erp-application-development-platform">ERP development platform overview</a>.</p>
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                <p>Role-based workplaces, registries, workflows and back-office applications that must reflect a company’s own operating model.</p>
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                <h3>Integration-heavy applications</h3>
                <p>Systems that combine a relational database with APIs, files, email, external services and existing Java or SQL components.</p>
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        <h2 id="fit-check">Is a code-first low-code platform right for you?</h2>
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                <h3>A strong fit when…</h3>
                <ul>
                    <li>business logic is more complex than a collection of CRUD screens;</li>
                    <li>developers need source control, modularity and repeatable environments;</li>
                    <li>the system processes large sets of related data and transactions;</li>
                    <li>you want the productivity of low-code without giving up extensibility.</li>
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                <h3>Probably not the first choice when…</h3>
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                    <li>the goal is a marketing or content website;</li>
                    <li>only non-technical users should build the application visually;</li>
                    <li>the project is a disposable form or a very small standalone dashboard;</li>
                    <li>a specialized off-the-shelf product already matches the process exactly.</li>
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        <h2 id="faq">Code-first low-code FAQ</h2>
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            <article class="faq-item">
                <h3>Is lsFusion a no-code platform?</h3>
                <p>No. lsFusion is code-first low-code. Developers write a declarative model; the platform automates repetitive application infrastructure around it.</p>
            </article>
            <article class="faq-item">
                <h3>Is lsFusion really open source?</h3>
                <p>Yes. The <a href="https://github.com/lsFusion" target="_blank">platform and IDE source code</a> are public, and the platform is distributed under the <a href="https://opensource.org/license/lgpl-3-0" target="_blank">LGPL v3 license</a>.</p>
            </article>
            <article class="faq-item">
                <h3>What applications is lsFusion designed for?</h3>
                <p>It is designed for data-intensive business applications with complex rules, transactions, forms, permissions and integrations—such as ERP, WMS and custom internal systems.</p>
            </article>
            <article class="faq-item">
                <h3>Can developers use Java or SQL?</h3>
                <p>Yes. Java interoperability, SQL access and integration mechanisms are available when a project needs application-specific extensions.</p>
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        <p>Open the online environment, follow the examples, or review how lsFusion compares with conventional application development platforms.</p>
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