Why I'm Building Acardai

I have 8 credit cards in my wallet.

For years I told myself that was fine. More cards meant more options, more points, more rewards. I was optimizing.

Except I wasn't.

I was swiping whatever card was on top. The one I'd last used. The one I happened to grab first. I had a Chase Sapphire Preferred, an Amex Gold, and a handful of others — and I was using all of them completely wrong.

I figured this out the hard way. I was going through my year-end statements, adding up what I'd actually earned, and something felt off. So I pulled up each card's reward structure and did the math — what I earned versus what I could have earned if I'd used the right card every time.

The gap was $640.

Not because I had bad cards. Because I had good cards I was using badly.

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The problem isn't the cards. It's the decision at the moment of purchase.

When you're standing at a grocery checkout, you're not thinking about which card earns 4x on supermarkets versus 3x on dining versus 1.5x on everything else. You're thinking about your groceries.

That moment — the split second before you tap or swipe — is where hundreds of dollars a year are won or lost. And nobody has built a good tool for it.

There are comparison sites that help you pick which card to apply for. There are spreadsheets for hardcore churners. There are Reddit threads with 200 comments that somehow still don't answer your specific question.

But there's nothing that just tells you: use this card, right now, for this purchase. Here's why.

That's the gap I'm building Acardai to fill.

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What Acardai does

You add the cards you already have. Acardai maps out exactly what each one earns across every spending category — groceries, dining, travel, gas, streaming, everything.

Then when you want to know which card to use, you ask. The AI looks at your specific setup and tells you the best card for that purchase, in plain English, with the math behind it.

It also tracks your card benefits — travel credits, dining credits, lounge passes — and reminds you before they expire unused. Because the $300 annual travel credit you forgot about is just as expensive as using the wrong card.

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Where we are

I started building this two weeks ago and the core is already done:

• Card catalog with real reward rates and category bonuses
• Wallet where you add your cards
• Recommendation engine — AI-powered, with a rule-based fallback so it never breaks
• Benefit tracking with expiry reminders
• Email notifications

271 tests passing. Build clean. Landing page is live.

What's left: loyalty tracking, travel planning, Stripe, and the full frontend. Then beta.

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Why now

Credit cards have never been more complicated. The best cards come with annual fees that are only worth it if you actually use the benefits. Sign-up bonuses require minimum spend. Category bonuses have caps. Transfer partners have ratios. The gap between a person who optimizes and a person who doesn't is growing every year.

Most people aren't going to become points hobbyists. They're not going to memorize rotating categories or track transfer partner sweet spots. They just want to know which card to tap.

Acardai is for them.

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Building in public

I'm sharing the journey openly — the progress, the numbers, the mistakes. If you're building something, I'd love to follow along. If you're someone with multiple credit cards who suspects you're leaving money on the table, the waitlist is at acardai.com.

Early access is free. I'd love your feedback.

— UB, founder of Acardai