Tendly

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  Organize open and completed tasks, with optional notes and due dates.

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  Select one of five unique eggs and give your new companion a name.

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  Track the growth of all five companions and see which friends you have fully raised.

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  View your daily goal, current progress, streak, and your pet’s mood at a glance.

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  Hatch your chosen companion through a simple swipe-based interaction.

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  Tendly is designed for mobile while remaining clean and usable on larger screens.

Inspiration

I recently bought a Tamagotchi—a Japanese digital pet you care for—and noticed how disciplined I became in looking after it. That inspired me to combine the idea with a to-do app to create the same sense of discipline.

What it does

The users create tasks, set a daily goal, and complete tasks to feed and grow one of five virtual pets. Each pet has different emotions and growth stages, while a demo mode lets judges explore everything immediately (activate in settings).

How we built it

I created the concept, visual style, pet designs, and product flow, then used Codex with GPT-5.6 to help implement and debug the task system, pet progression, onboarding, responsive design, and deployment.

Challenges we ran into

The hardest part was making tasks, daily progress, pet moods, and saved data work together reliably. I learned how much testing, iteration, and attention to small design details matter when turning an idea into a polished product—especially since this is the first app I’ve ever built.

Accomplishments that we're proud of

I discovered the hackathon with only two days remaining, so I’m especially proud that I managed to turn my idea into a complete, polished, and publicly deployed app within that time. This is also the first full app I’ve ever built, which makes finishing Tendly even more meaningful to me.

What we learned

We learned that there is far more to building an app than the initial idea. Beyond the main features, details like design, onboarding, persistence, responsiveness, testing, and deployment all play a major role in making a product feel complete.

What's next for Tendly

Next, we want to expand Tendly with more pets, accessories, environments, deeper progression, account syncing across devices and lots of cool animations for the pets to feel alive. We also plan to add smarter task organization and reminders while keeping the app simple, calm, and fun to use. This is also the first full app I have ever built, which makes completing Tendly even more meaningful to me.

Built With

• codex
• css
• github
• gpt-5.6
• html
• javascript
• local-storage
• next.js
• progressive
• react
• responsive-design
• shadcn/ui
• tailwind-css
• typescript
• vercel
• web