Capsula AI: iPhone app for content creation
Role: Sole Product Designer
Duration: Early 2024 (3 weeks)
Team: 1 PM, 2 iOS Developers
Domain: iOS · B2C · Creator Tools · Mobile AI
Context
Capsula AI is a mobile-first AI application that helps content creators generate and style video captions directly on their iPhone.
The project started from scratch - with only an idea - and was designed and shipped to the App Store within 3 weeks.
The core hypothesis was that for modern creators, the smartphone is the primary working tool, while most captioning solutions remain desktop-first or overly complex.
The goal was to deliver instant value while keeping creators in full control of quality and visual style.
Challenges
Very tight timeline
Full design cycle and App Store launch in 3 weeks.
Mobile constraints
Large amounts of text, settings and timing on a small screen.
AI trust
Subtitles needed to be fast, accurate, customizable, and fully editable.
Solo designer
UX, UI, flows, caption editing logic, motion, onboarding, and App Store assets were fully owned by me.
Users & Use Cases
Target users
Mobile-first content creators.
Primary goal
Add visually appealing captions quickly and share instantly.
Core flow
Open app → add video → AI generates captions → edit captions → choose style → share
Solutions
What was done and what benefits were achieved for each solution:
IOS focused
Designed around:
bottom navigation
one-hand usage
gesture-based interactions
Live caption preview
Captions are edited directly on top of the video, eliminating context switching and reducing friction.
Editable AI output
AI delivers instant results while allowing users to:
fix recognition errors
adjust text
change caption styles in real time
Minimal UI for complex tasks
A deliberately minimalist interface keeps focus on content while handling text-heavy editing on mobile.
Onboarding focused on fast value
To minimize first-time friction and ensure users experience value immediately, a lightweight onboarding flow was designed.
Research, Discovery & Validation
Capsula AI was rolled up in October 2024. For discovery & research, I used different technics:
Customer review & CustDevs, competitors analisys
Ran user tests, quick corridor tests, and customer interviews.
Prototype / MVP test
Got feedback from users through support and product analytics.
Impact
4.6 rating in Apple App store.
Stable in-app purchases.
Clear early user interest and validation.
Results, Reflections and Takeaways
Designed and shipped a mobile AI caption editor from idea to App Store in just 3 weeks as a sole product designer.
Coming from a B2B SaaS background, this project was a conscious shift into consumer mobile UX, where:
speed matters more than configurability
UI should disappear rather than explain itself
AI only creates value when it delivers instant results with user control
This experience significantly strengthened my mobile-first and AI-driven product thinking.