06 / Estratégia Cast · EdTech · 2020Shipped on iOS and Android

Study in motion.

An audio-learning product built around persistent playback, offline access and resilient states.

Estratégia Cast home with persistent mini-player
Estratégia Cast player speed control
Estratégia Cast offline library

Player · Offline · Search · Product states

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01 / Player continuity

Keep listening without losing context.

The experience kept the active lesson visible across discovery, album detail and playback controls.

Home with a persistent audio mini-player
Persistent playback across navigation
Album detail with lessons and persistent player
Album structure and listening context
Expanded audio player with speed control
Playback speed for different study rhythms

02 / Offline learning

Offline was a first-class state.

Availability, access limits and download behavior needed to remain understandable before and after the connection disappeared.

Offline audio library
Downloaded lessons in one dedicated library
Album detail with locked lessons and offline availability
Access and availability at lesson level
  1. 01Make availability legible before connectivity changes.
  2. 02Keep playback and progress visible across navigation.
  3. 03Separate access limits from technical failures.

03 / Resilient states

Design the moments people notice last.

Loading, empty and connection states preserved orientation and offered a clear path forward.

Search loading skeleton
Loading · Preserve the expected structure
Search empty state
Empty · Explain the result without blame
Connection error state with retry action
Error · Offer one clear recovery action

04 / Interaction prototype

Prototype continuity, not isolated screens.

The prototype connected album detail, offline availability, playback progress and favorites in one continuous study flow.

Interaction prototype using demonstration content · Album · Offline · Playback · Favorite

05 / Product context

A full study product, not just a player.

Students already searched for ways to keep studying through audio. Estratégia Cast turned that demand into a dedicated product for discovery, playback and offline learning.

As part of a shared product effort, I contributed hands-on to the iOS and Android flows and resilient interaction states. The product launched publicly on the App Store and Google Play, with continued work in 2020 around download visibility, listened states and in-app feedback.

06 / Platform system

One product. Two platform systems.

The shipped experience covered the same product logic across iOS and Android without collapsing platform-specific behavior.

The final source files document equivalent breadth across signup, home, search, album, player, favorites, downloads, account and support. The system continued to expand after launch rather than ending at a single release.

  • 87iOS artboards in the final source
  • 87Android artboards in the final source
  • 2019–2020Launch and documented product evolution

07 / Launch reception

What the stores captured at launch.

At the captured launch moment, Estratégia Cast ranked #2 in Education on the Brazilian App Store. The Google Play capture recorded an equally strong early signal.

App Store

  • 4.7/5rating
  • 44ratings
  • #2Education

Google Play

  • 5.0/5rating
  • 27ratings
  • 1,000+installs

Historical store captures dated 4 November 2019. Ratings, ranking and installs are reported as observed launch reception, not as causal design impact.

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