About CardOptimizer
What is CardOptimizer?
CardOptimizer is a free tool that helps you check your eligibility for credit cards before you apply. Every credit card application triggers a hard inquiry on your credit report, and getting denied means you took that hit for nothing. We built CardOptimizer to prevent that.
The Problem We Solve
Credit card issuers have dozens of hidden rules that can block your approval or disqualify you from a welcome bonus — even if you have excellent credit. Chase rejects applicants who have opened 5+ cards in 24 months. Amex won’t give you a bonus on a card you’ve had before. Citi limits how often you can apply. These rules are scattered across forums, blog posts, and data points, making them hard to track.
CardOptimizer consolidates all of these rules into one place and checks them automatically based on your profile. Instead of spending hours researching, you get an instant eligibility assessment for every card.
How It Works
1. Tell us about your credit history
How many cards you’ve opened recently, what cards you hold, and any bonuses you’ve received.
2. We run eligibility checks
Your profile is analyzed against 21 issuer-specific rules covering Chase 5/24, Amex lifetime bonus, Citi velocity limits, family card restrictions, and more.
3. Get personalized recommendations
See which cards you’re eligible for, which ones are blocked, and exactly why — with links to detailed explanations.
Privacy First
All eligibility checks run locally in your browser using JavaScript. Your profile is stored in localStorage by default. If you create an account, your profile is also synced to our secure cloud database so you can access it across devices. We never track your eligibility data or share it with card issuers. Read our full privacy policy for details.
By the Numbers
131
Active cards
10
Issuers
20
Eligibility rules
About the Creator
Isaac Baek
Software Engineer · San Jose, California
CardOptimizer is built and maintained by Isaac Baek, a software engineer and former Meta engineer with a background in data systems. After tracking credit card issuer rules for personal use, he built CardOptimizer to automate the process and share it with others who want to avoid wasted hard pulls.
This is an independent project. CardOptimizer is not affiliated with any credit card issuer, bank, or financial institution. All rule analysis is based on publicly documented issuer policies and community-reported data points.
LinkedIn profileOur Sources
Card data is sourced from official issuer pages and verified against trusted community resources. Eligibility rules are based on widely reported data points from the credit card community, including Doctor of Credit, Reddit r/churning, and other established sources. We regularly review and update our data to reflect the latest changes.
Transparency
CardOptimizer does not currently earn revenue from card issuers or affiliate links. All application links point directly to official issuer pages. If this changes in the future, it will be disclosed here and will not influence eligibility results, rule evaluation, or recommendation ranking.
CardOptimizer does not provide financial advice. This tool only evaluates approval eligibility based on known issuer policies and historical data points.
Last reviewed: February 2026