Prototyping & Interaction Design

Why Does Prototyping Matter?

A static design in Figma is only half the work. Users don't interact with static images — they tap, scroll, type, and delete. Prototyping is what transforms a static design into a living experience that users can actually interact with.

Benefits of prototyping:

Test ideas quickly: Before a developer writes a single line of code, you can test the entire flow
Clear communication: Instead of explaining to a developer "the user taps here and goes there," let them see and try it
Catch problems early: A problem found in a prototype takes minutes to fix. The same problem found after development takes days
Persuade decision-makers: Presenting an interactive prototype is far more powerful than showing static screens
User testing: You can run tests with real users on the prototype

Fidelity Levels

Not every prototype needs the same level of detail. Choose the appropriate level based on your goal:

1. Low-Fidelity Prototype

Form: Hand-drawn sketches on paper or simple wireframes
Goal: Test the basic flow — are the steps logical?
When to use: At the start of a project when exploring different solutions
Time: Minutes to hours
Tools: Paper and pencil, Whimsical, Balsamiq

2. Mid-Fidelity Prototype

Form: Interactive wireframes with grayscale colors and real content
Goal: Test page structure, element arrangement, and navigation
When to use: After you've defined the basic flow and want more detail
Time: Hours to a day
Tools: Figma, Sketch

3. High-Fidelity Prototype

Form: The final design with all details — colors, fonts, images, and interactions
Goal: Test the complete experience and get final approval
When to use: Just before development or for detailed user testing
Time: Days
Tools: Figma, Principle, ProtoPie

Important tip: Don't start with a high-fidelity prototype. Start low and gradually increase fidelity. If you build a high-fidelity prototype from the start and discover the flow is wrong, you will have wasted days of work.

Prototyping in Figma

Figma has a powerful built-in prototyping system. Let's learn the basics:

Setting Up Prototype Mode

Click on the Prototype tab in the right panel
Select the frame you want as the starting point
Click Set as Starting Frame — this is the first screen the user will see

Adding Interactions

Every interaction in Figma consists of three parts:

1. The Trigger — what starts the interaction:

On Click / On Tap: when the user taps — the most common
On Hover: when the mouse passes over the element (desktop only)
On Drag: when an element is dragged
While Pressing: while holding down
After Delay: after a set time — suitable for splash screens

2. The Action — what happens:

Navigate To: transition to another screen
Open Overlay: open a window on top of the current screen (Modal, Dropdown)
Close Overlay: close the popup window
Swap Overlay: swap one window for another
Back: return to the previous screen
Scroll To: scroll to a specific element on the page

3. The Transition — how the motion happens:

Instant: immediate change with no animation
Dissolve: fade — the screen gradually disappears and the new one appears
Move In/Out: the screen slides in or out from a direction
Push: the new screen pushes the old one
Slide In/Out: sliding motion
Smart Animate: the smartest option — Figma automatically animates matching elements

Smart Animate in Detail

Smart Animate is the most powerful feature in Figma prototyping. It works on a simple principle: if there is an element with the same name in two screens, Figma will animate it from its position in the first screen to its position in the second.

Example: You have a small card on a list screen. When the user taps it, they go to a detail screen that has the same card, but larger. If the name is the same in both screens, Smart Animate will create a smooth expand animation.

Tip: Name your layers in an organized and consistent way. This not only helps with Smart Animate — it also makes working with developers much easier.

Types of Interactions

1. Micro-interactions

Small movements that happen in response to a user action:

Toggle Switch: changes from On to Off with a sliding motion
Like button: changes its shape and color when tapped
Input field: borders change color when the user focuses on it
Checkbox: a checkmark appears with a small motion

Movements associated with transitioning between screens:

Push Transition: the new screen pushes the old one — suitable for forward navigation
Slide from Bottom: a screen rises from below — suitable for modals and bottom sheets
Fade: dissolve — suitable for swapping content on the same page
Hero Animation: an element grows and transforms from the first screen to the second

3. Loading Interactions

Skeleton Animation: gray elements that shimmer (Shimmer Effect)
Progress Bar Animation: a bar that fills up gradually
Pull to Refresh: pull down to refresh content

4. Gesture Interactions

Specific to mobile:

Swipe to Delete: swipe left or right to delete an item
Pinch to Zoom: zoom in with two fingers
Long Press: long press to open an options menu

Interaction Design Principles

1. Feedback

Every user action must have a response:

Tap a button → color or size change
Submit a form → confirmation message
Input error → clear error message

If a user taps something and nothing happens, they will assume there's a problem.

2. Consistency

The same action must produce the same result everywhere:

All primary buttons behave the same way
Forward navigation always uses the same motion
Going back always uses the same motion (but reversed)

3. Appropriate Speed

Interactions must be fast enough not to slow the user down, and slow enough for the user to notice:

Micro-interactions: 100-200ms
Screen transitions: 200-400ms
Large elements (Modal, Page): 300-500ms

Rule: If the animation is under 100ms the user won't feel it. If it's over 500ms they'll feel the app is slow.

4. Anticipation

The motion must be predictable — meaning the user can anticipate what will happen:

A button grows slightly on hover → anticipation that it's tappable
A screen moves from the right → anticipation that it will move to the right when going back

5. Natural Motion

Motions in nature aren't linear — things start slow, accelerate, then decelerate before stopping. This is called Easing:

Ease-in-out: the smoothest motion — starts and ends slowly. Best for most cases
Ease-out: starts fast and slows down. Suitable for elements entering the screen
Ease-in: starts slow and speeds up. Suitable for elements leaving the screen
Linear: constant speed — looks mechanical and unnatural. Avoid it

Micro-interactions in Detail

Micro-interactions are the details that differentiate an ordinary app from an excellent one. They are small movements that make the experience feel alive and satisfying.

Anatomy of a Micro-interaction

Every micro-interaction consists of 4 parts:

Trigger: what starts the interaction — a tap, mouse hover, data input
Rules: exactly what happens — color change, motion, sound
Feedback: what the user sees or feels
Loops & Modes: does the interaction repeat? Does it change over time?

Examples of Successful Micro-interactions

Instagram Like button: the heart grows and is colored with a pulsing animation
Pull to Refresh: the icon moves with the finger then spins
Typing indicator in chat apps: the three animated dots
LinkedIn profile strength bar: "Your profile is 70% complete"
Password field shake when wrong: a quick shake animation that conveys "No, that's wrong"

Don't Overdo It

Micro-interactions must actually be micro. If every element on the screen is moving and bouncing, the experience will become exhausting and distracting. The rule: an interaction must serve a purpose — if it has no clear function, remove it.

Building an Interactive Prototype in Figma — Step by Step

Let's build a prototype for a complete login flow:

Step 1: Prepare the Screens

Design the following screens:

Welcome screen
Login screen
Verification screen
Home screen
Login error state

Step 2: Define the Flow

Welcome → Login (tap "Sign In" button)
Login → Verification (tap "Submit" after entering data)
Login → Error State (wrong credentials)
Verification → Home (enter the correct code)

Step 3: Add Interactions

Select the "Sign In" button on the Welcome screen
From the Prototype panel, drag a connection to the next screen
Set: On Click → Navigate To → Login
Transition: Smart Animate, 300ms, Ease-in-out

Step 4: Add Overlays

Error modal: On Click → Open Overlay → Position: Center → Background: Dim
Close button: On Click → Close Overlay

Step 5: Add Component Interactions

Change button states (Default → Hover → Pressed) using Interactive Components. Each state becomes a Variant in a Component Set.

Press Play (▶) to try the prototype
From Share, copy the link and send it to anyone to try
Enable Allow Commenting so they can leave feedback

Advanced Prototyping Tools

When your needs exceed Figma's capabilities:

ProtoPie: for complex interactions based on real data and mobile sensors
Principle: for smooth and complex animations on macOS
Framer: for interactive prototypes with real code (React)
Origami Studio (Meta): for advanced interactions with React Native integration

Tip: Figma is sufficient for 90% of your needs. Don't move to another tool unless you have a specific reason.

Common Prototyping Mistakes

1. Prototyping Everything

Not every button in the app needs to work in the prototype. Focus on the core flows you're going to test.

2. Unrealistic Interactions

The prototype must represent the real experience. Don't add fantastical animations that won't be implemented in development.

3. Ignoring Error States

A successful prototype includes error paths — what happens if the user enters wrong data? What if the internet connection drops?

A prototype that no one has tried has no value. Share it with the team and users, and collect their feedback.

Practical Exercise

Build an interactive prototype for a food delivery app:

Home screen: restaurant list + search + filters
Restaurant page: dish menu with the ability to add to cart
Cart: order summary + payment button
Order confirmation: summary + success message

Required interactions:

Screen transitions (Smart Animate)
Add to cart (Micro-interaction — counter that increments)
Order confirmation modal (Overlay)
Empty cart state (Empty State)
Button press effect (Hover + Pressed states)

This exercise brings together everything you've learned — start with the basic flow and then add the details.