How to Integrate Lovable with Marvel

Marvel supports several ways to create prototype screens, and the right method depends on how polished your designs are at this stage. If you have Figma or Sketch designs ready, the fastest path is using Marvel's Figma plugin or Sketch plugin to import them directly. From Figma: install the Marvel plugin from the Figma Community, select the frames you want to prototype, and export them to your Marvel project. They import as screen images ready for hotspot linking. From Sketch: the Marvel plugin works identically — select artboards, export to Marvel. If you do not have polished designs yet, Marvel has a built-in design tool with basic shapes, text, and image placement sufficient for wireframes. This is faster than creating full Figma mockups for early-stage concepts. Alternatively, take photos of paper sketches and upload them as screens — Marvel supports image uploads in PNG, JPG, or PDF, and rough sketches work perfectly well for initial user testing. The goal at this stage is capturing the flow and layout, not pixel-perfect visual design. For each major screen in your app concept — home, detail page, form, confirmation, settings — create a corresponding Marvel screen. Marvel projects organize screens in a grid and support naming each screen clearly (e.g., 01-Home, 02-Item-Detail, 03-Cart, 04-Checkout). Good naming makes the next step (linking hotspots) much easier to navigate. Aim for coverage of your primary happy path first: the most common journey a user will take through the app. Add error states and edge cases only after validating the primary flow.

Hotspots are the clickable areas in Marvel that link screens together, creating the interactive prototype experience. In your Marvel project, click on any screen to enter its edit view. You create hotspots by drawing rectangles over interactive areas — buttons, navigation links, cards, input fields — and then selecting which screen that hotspot navigates to when tapped or clicked. For each hotspot, Marvel offers transition animations (push left/right, fade, slide up) that simulate real navigation behavior. For a mobile app's primary button, a 'Push left' or 'Slide up' transition feels natural. For modal dialogs or overlays, use 'Fade' or 'Slide up from bottom'. Using transitions that match expected native behavior makes prototypes feel more realistic and produces more reliable user testing data. Cover all the critical interactions in your primary flow. If your home screen has 5 items in a list, you only need to link one of them — testers understand the pattern and the prototype does not need every possible path. Focus your hotspot coverage on: the primary CTA buttons, the main navigation elements, and any branching decision points that are core to your UX hypothesis. Secondary features and edge cases can be non-interactive. Once hotspots are added to all key screens, click the 'Play' button in Marvel to enter full-screen prototype mode. Walk through the flow yourself first and verify every intended interaction works as expected. Check that the flow reaches a logical end point (a confirmation screen, a success state, or a circular loop back to home) so testers are not left stranded.

Marvel generates a shareable prototype link that works on any device without installation. Click the 'Share' button in your Marvel project to get a public URL. Send this link to your target users — ideally 5-8 people who represent your actual intended users — along with a brief description of what you want them to try. Keep the instructions minimal: 'Imagine you want to track your daily habits. Use this prototype to explore how you would set up and track your first habit.' Marvel's free plan supports unlimited prototype sharing and basic analytics showing which screens were visited and how long users spent on each. This basic data reveals drop-off points where users got stuck or confused. The paid plan adds Marvel's user testing features: recorded sessions with screen capture and click tracking, which provide much richer insight but are not required for early validation. The most valuable feedback method is a moderated session where you watch someone use the prototype in real time (via video call with screen share). Ask them to think aloud as they navigate: 'What would you tap next? What do you expect to happen?' Note confusion moments, unexpected navigation attempts, and places where they look for something that is not there. Do not explain how to use the prototype — confusion is the data. After collecting feedback from 5+ users, look for patterns: Are multiple people making the same mistake? Is a key action consistently missed? Does the onboarding flow lose people before they reach the core feature? These patterns tell you what to change in the prototype before building in Lovable. Iterate the Marvel prototype (which is free and fast) until the patterns of confusion disappear, then proceed to Lovable.

Prototype iteration in Marvel is fast because you are only moving screens and hotspots, not writing code. Based on the user testing feedback, make the necessary changes: reorder screens if the flow confused people, add a step that was missing, remove an unnecessary screen that nobody needed, or redesign a layout that consistently caused confusion. A validated prototype is not one that is perfect — it is one where users can successfully complete the primary task without significant confusion, and where you are confident the app addresses a real problem in a way that makes sense to the target user. The bar for validation depends on your context: for an internal team tool, informal sign-off from team members may be sufficient. For a consumer product or one you will spend significant Lovable credits building, five users successfully completing the flow without confusion is a reasonable threshold. Once you have a validated prototype, document the approved screens: take clear screenshots of every screen in its final state and organize them as your Lovable build reference. Note for each screen: the screen name/purpose, the primary action (what the main CTA does), any data that needs to come from Supabase (lists, user data, dynamic content), and any conditional states (empty state, loaded state, error state). This documentation becomes the spec for your Lovable build. Pay special attention to the transitions and interactions users found natural in the prototype. If users expected a bottom sheet for the add-item form, build it as a bottom sheet in Lovable. If users intuitively swiped to go back, build swipe navigation. The prototype has revealed the mental model — honor it in the build.

With a validated prototype in hand, you start the Lovable build with significantly more confidence than if you had designed and built simultaneously. Open your Lovable project and begin screen by screen, using your Marvel screenshots as visual references alongside the Lovable chat panel. For each screen, write a Lovable prompt that describes both the visual structure (from the Marvel screenshot) and the functional requirements (data, auth, interactions). The functional requirements are the key addition beyond what Marvel showed — Marvel screens were static mockups, but Lovable will implement real database connections, authentication, and live state management. Start with the most-used screens: the main dashboard or home screen that users spent the most time on in testing, then the primary workflow screens, then secondary and settings screens. For each Marvel screen that showed a list of items, specify in the Lovable prompt that the data comes from Supabase — Lovable will generate the database schema, RLS policies, and query logic. For any screen that required login to access, include authentication requirements in the prompt. As you build, compare each Lovable output against its corresponding Marvel screen. The layout and content structure should match closely. The colors and typography may differ if you did not have precise Figma specs — if visual accuracy is important, extract color values from your Marvel screens (color-picking from screenshots) or ask your designer to provide the exact values. If you encounter a complex interaction that Marvel prototyped but Lovable struggles to implement correctly, describe the intended behavior clearly: 'When the user taps the card, a bottom sheet slides up containing the detail view. The bottom sheet is draggable and can be dismissed by swiping down.' Clear behavioral descriptions of the Marvel interactions you validated help Lovable generate the right component structure.