Prototyping, designs users can touch before code lands, decisions made with evidence, not opinions.
Prototyping is the cheapest way to be wrong before it gets expensive. We build interactive prototypes, high enough fidelity to test, low enough fidelity to throw away, and run them past real users so the engineering team builds the version that worked, not the version that seemed plausible.
What we build
Figma prototypes for flow-level testing
Multi-screen flows wired with proper interactions, conditional logic, and component state. Users navigate the prototype like a real product; we observe where they get stuck. Fast to iterate, easy to throw out.
Framer for the in-between fidelity
When Figma can't do the interaction (real form input, complex states, drag-and-drop), Framer carries it. Closer to production fidelity, still cheaper than engineering.
Rive for micro-interactions
Component-level interaction prototypes (the right hover, the right toggle, the right transition) prototyped in Rive and exported as runtime files. The animation team and the engineering team share the same source.
ProtoPie for sensor + device interactions
Mobile prototypes that need camera, gyroscope, or haptics, ProtoPie handles them. Useful for native app prototypes where the interaction depends on the device.
User testing built into the prototyping cycle
Every significant prototype gets tested with 5 representative users. Sessions recorded; insights synthesised; the design either ships or iterates. No prototype lives without a test backing the next decision.
Disposable by design
Prototypes aren't engineering scaffolding. They're throwaways. The engineering build references the design spec that emerged from the prototype, not the prototype itself. Throwing the prototype away when it's done its job is the point.
Where this fits
You're about to commit engineering time to a major new feature and the design hasn't been touched by a user yet.
Your team is debating two design directions and you need evidence, not more meetings.
Your last release had a usability issue that a $200 prototyping session would have caught.
Tech stack
- Figma
- Framer
- Rive
- ProtoPie
Want this for your team?
30 minutes with a founder or senior engineer. We'll scope what you need and tell you straight whether Stacklane fits.
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