LidTap - NFC Supplements

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  LidTap - App icon

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  LidTap - Add your NFC tag

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  LidTap - Supplements list tab

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  LidTap - Tracking over time

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  LidTap - Notification

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  LidTap - Home screen widget

Inspiration

I take food supplements myself (zinc, magnesium, omega-3, and others), and I need iPhone reminders to make sure I actually take them, otherwise I forget. One day I thought: there has to be a better way to keep track of what I take. As I kept thinking about it, I realized I might not be the only one who wants this - and that some people have even stronger reasons to stay consistent, like pregnant women and parents of infants. And boom! That’s how LidTap was born.

What it does

LidTap lets you log a food supplement with an iPhone tap - literally. Stick any NFC tag on a bottle (they cost almost nothing), pair it with the app, and each time you hold your iPhone close to the tag, you log the dose and the time you took it. You can also set up notifications so the app reminds you when it’s time to take a supplement. All previous intakes are available both as a list and on a chart, so you always know what you took and when. Finally, a Home Screen widget shows at a glance which supplements you’ve already taken, and which ones are still left for the day.

How we built it

This is the first app I’ve ever built with native technology, Swift. I had very little experience with it, so Cursor and Grok wrote most of the code, while I focused on the design and the exact features. RevenueCat powers the subscriptions.

Challenges we ran into

Since it was my first time using native technologies, that was also the main challenge: figuring out how to actually build a native app. With a bit of research and help from AI, everything went smoothly. It was also my first time using external hardware (NFC tags) to communicate with an app. The implementation turned out to be pretty straightforward.

Accomplishments that we're proud of

I’m proud that I was able to ship a native app that actually helps me: I no longer forget my supplements, I can track every intake, and I have access to history, charts, and exports. I’m also proud that this is my first app that talks to external hardware - NFC tags.

What we learned

I learned that building a native app, and connecting it to NFC tags, is not as hard as I expected, especially with the help of AI.

What's next for LidTap - NFC Supplements

Even though LidTap has some friction (you need NFC tags), I want to get it in front of as many people as possible, especially people who rely on food supplements for real health reasons, like pregnant women and parents of infants.

Built With

• ios
• swift