AssistMate

AssistMate – Your Friend in Every Situation 🤝

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Inspiration

The idea for AssistMate came from a close friend of mine who was very shy. He struggled to talk with girls confidently and often felt sad about it. I wanted to create something that could give him guidance and boost his confidence whenever he needed it. When I learned about AI capabilities, I realized I could build a personal AI assistant to help anyone get expert advice anytime, anywhere—not just my friend, but students, seniors, job seekers, anyone facing life's challenges.

What it does

AssistMate is your friend in every situation. => How it works:

  • You define a role once—just a name and description (like "Career Coach" or "Cooking Expert")
  • The AI remembers your last 10 messages, so answers are personal and context-aware
  • Choose from three modes based on your needs: Economy: Fast, simple replies (free, 10 questions/day) Balanced: Clear, well-structured answers Detailed: Comprehensive, professional insights

=> Features:

  • Create unlimited roles for different situations
  • Search through your roles easily
  • Track your message count
  • Try premium plans with 3-7 day trial periods
  • Safe AI that avoids harmful or unsafe advice

How we built it

Tech Stack:

  • Built with Kotlin and Compose Multiplatform
  • Powered by Google Gemini 2.0 Flash Lite for AI responses
  • RevenueCat for subscription management (1 offering, 12 products, 4 entitlements)

Key Implementation:

  • Roles stored as system prompts for context-aware conversations
  • Last 10 messages summarized and remembered for continuity
  • Three subscription tiers (Economy/Balanced/Detailed) with weekly/monthly options
  • Search functionality to find previously created roles
  • Safety measures to ensure responsible AI responses
  • Message counting and tracking system

Challenges we ran into

Technical:

  • Designing AI that remembers context but stays lightweight and fast
  • Started with Compose Multiplatform for iOS too, but hit issues I haven't resolved yet (Android-only for now)
  • Implementing subscription management and message counting seamlessly

Product:

  • Balancing free vs premium features without limiting user creativity
  • Making answers personal, reliable, and trustworthy across different roles
  • Finding the right pricing that's accessible but sustainable

Personal:

  • Building alone with limited time—progress was slow
  • Learning to say no to feature requests to keep it simple

Accomplishments that we're proud of

✅ Created an AI assistant that truly remembers context and adapts to user needs ✅ Users can create unlimited expert roles, making it deeply personal ✅ Successfully implemented three modes for different user budgets and needs ✅ Made AI accessible with 10 free questions daily forever ✅ Designed honest pricing ($2-18/month) with transparent trial periods ✅ Built safety measures so AI avoids harmful advice ✅ Achieved 86-90% profit margins, proving social good can be sustainable Most proud of: Helping my shy friend gain confidence, then realizing this could help millions of others too.

What we learned

Technical:

  • Integrating AI with custom roles and system prompts creates truly personal experiences
  • People value continuity and context in AI conversations
  • Memory management (summarise last 10 messages) is the sweet spot between context and performance

Product:

  • Designing flexible subscription models is crucial for user adoption
  • Simplicity wins—two screens are enough if they're the right two screens
  • Free tiers build trust, which converts to paid users

Design:

  • Safety and responsible AI design are essential for building trust
  • Clear button copy and transparent pricing matter more than flashy features

Personal:

  • Building in public doesn't require daily posts—honesty matters more
  • Community feedback beats my assumptions every time
  • You can build something meaningful even with limited time

What's next for AssistMate

Short-term:

  • Fix iOS issues and launch on iOS (making it truly cross-platform)
  • Improve memory to handle longer conversations beyond 10 messages
  • Gather user feedback from early adopters to refine the experience

Medium-term:

  • Voice integration to make AssistMate even more interactive and accessible
  • Build Community - Community-shared roles so users can benefit from others' expertise
  • More AI models for specialized domains and capabilities

Long-term:

  • Expand to web version for desktop users
  • Partner with schools to help students like my friend
  • Scale globally while keeping the free tier sustainable

The mission: Help people gain confidence and get expert advice whenever they need it—just like I wanted to help my friend. 🚀

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Updates

posted an update —

Release note for updated app (Version - 1.4)

  • Edge-to-Edge UI – Sleek full-screen look for modern Android.
  • Navigation Drawer – Access all features easily in one place.
  • Manage Subscription – Now right from the home screen.
  • Share APK – Send AssistMate directly to friends.
  • Rate & Support Us – Show your love with a quick tap.
  • Smarter System Prompt – Blocks fraud, illegal, or unsafe advice.
  • Premium Fix – No more restarts after purchase.

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