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Guides & insights
Data-driven credit card guides, comparisons, and rewards strategies.
Chase Sapphire Preferred vs Reserve: The $700 Fee Gap and What It Actually Buys
Sapphire Reserve costs $700/year more than Sapphire Preferred. We total every credit on both cards — advertised max vs. what this app counts as reliable.
Marriott Bonvoy Boundless vs World of Hyatt: Same $95 Fee, Opposite Earn Shape
Marriott Boundless leads with a strong 2x baseline and capped bonus categories; Hyatt leads with a plain 1x and uncapped ones. Same fee, opposite structure.
Southwest Priority vs United Explorer: A $79 Fee Gap That the Earn Rates Don't Explain
Southwest Priority costs $229/year vs. United Explorer's $150 — Southwest's one credit models to $0 while United's Global Entry credit is real, usable value.
Apple Card vs Citi Double Cash: The "Up to 3%" Card Against the Flat 2% Card
Apple Card pays 1% by default, 2% only via Apple Pay, 3% only on direct Apple purchases. Citi Double Cash pays a flat 2% on everything, no conditions.
Amex Business Gold vs Chase Ink Business Preferred: Which Business Card Earns More?
Ink Preferred's fixed 3x travel, shipping, advertising, and internet/cable/phone categories vs. Amex Business Gold's auto-selected 4x top two from six eligible families. Compare fees, caps, and the conservatively valued credit.
Discover to Capital One Migration: What Cardholders Need to Know
Discover card accounts are moving to Capital One in waves through early 2027. Here is what stays the same, what changes, and what cardholders should do.
Capital One Quicksilver vs Citi Double Cash: Which Flat-Rate Card Actually Pays More?
Both are $0-fee 'flat rate' cards, but the rates aren't equal — Quicksilver pays 1.5%, Double Cash pays 2%. Here's where they match and where they don't.
United Explorer vs Delta SkyMiles Gold: Same $150 Fee, Very Different Credits
Both entry-level airline cards charge $150 and earn 2x on two categories each — but United Explorer's credit list models real usable value where Delta Gold's doesn't.
Is the Amex Platinum Worth It? The $895 Question, Answered With Math
The Amex Platinum charges $895/year but advertises thousands in credits. Here’s what the credit stack is realistically worth, and the spend level where the card actually pays for itself.
Credit Card Combinations Depend on Spending — Three Solver-Verified Pairings
There is no universal credit card combination. We show three 2-card pairings our CP-SAT solver verified for stated household, traveler, and everyday-spender profiles, with modeled net-value figures.
Wells Fargo Autograph vs Autograph Journey: Is the $95 Upgrade Worth It?
Autograph is free and earns 3x on six everyday categories. Autograph Journey charges $95 and trades several of those for higher travel rates. Here's the actual math.
Robinhood Platinum Card Goes Live: $695 Fee, Invite-Only for Now
Robinhood's new $695 Platinum card went live for invited users on July 22, 2026. What launched, who's affected, and why the optimizer isn't modeling it yet.
Chase Freedom Unlimited vs Chase Freedom Flex: The Everyday-Floor Tradeoff
Same $0 fee, same 3x dining, drugstore, and travel-portal rates. The real difference is what happens to spend outside those bonus categories.
Bank of America Customized Cash vs Citi Custom Cash: Pick-It-Yourself or Auto-Detect?
Both cards build their whole identity around one bonus category — the difference is whether you choose it or the card figures it out for you.
Chase Freedom Flex Is Dropping Its Foreign Transaction Fee — But Losing Cell Phone Protection
Starting September 20, 2026, Chase Freedom Flex loses its 3% foreign transaction fee and its cell phone protection benefit in the same update.
How Many Credit Cards Should You Have? A Framework, Not a Magic Number
There’s no universal right number — there’s a point where the next card stops paying for the hassle. Here’s how to find that point for your spending.
Does Applying for a Credit Card Hurt Your Credit Score?
The honest answer: yes, a little, temporarily — and it’s usually not a reason to avoid a multi-card strategy. What moves your score, factor by factor.
Business Credit Cards and Your Modeled Wallet: Do They Fit?
Ink Cash, Ink Unlimited, Ink Preferred, and Amex Business Gold can outearn personal cards — if you qualify. How they fit alongside a personal wallet.
Are Welcome Bonuses Worth Chasing? The Actual Math
A welcome bonus can be worth more than a year of category earning — or barely worth the paperwork. How to value one against its minimum-spend requirement.
How Bilt’s Rent Tiers Actually Work in 2026 (With the Math)
Bilt’s rent earning isn’t a flat rate — it’s a ratio ladder from 250 points a month up to 1.25x on your entire rent. The exact tier math, card by card.
Do Annual-Fee Cards Actually Out-Earn Free Wallets? We Made the Solver Choose
Four profiles solved twice — full catalog vs $0-fee cards only. Fee cards won by $50.45/year on average; the lightest spender’s optimal fee was $0.
Optimizing Credit Cards as a Couple: One Strategy or Two?
We solved a couple’s cards separately and together. Pooling spend at the same card count earned $98/year more — but merging onto fewer cards lost money.
Chase 5/24, Amex Lifetime Language, Citi 48 Months: The Rules That Shape Your Setup
A strong setup on paper can be unreachable if you apply in the wrong order. The issuer application rules that matter, sorted by how official they are.
Chase Freedom Flex vs Discover it Cash Back: Which Rotating-Category Card Wins?
Both cards run on 5% rotating quarterly categories. We compare the fixed-rate floor underneath — where these two $0-fee cards actually differ.
Hilton Surpass vs Hilton Aspire: Does the $400 Fee Gap Pay for Itself?
Hilton Honors Surpass ($150) vs Hilton Honors Aspire ($550): we compare earn rates and resort credits to find out when the pricier card actually wins.
Amex Platinum Tightens Centurion Lounge Access Starting July 8
Amex is limiting Centurion Lounge access to a 5-hour pre-departure window and closing the same-flight guest loophole. What changes and what doesn’t.
Amex Gold vs Amex Platinum: Which Amex Card Actually Pays for Itself?
Amex Gold ($325) vs Amex Platinum ($895): earn rates compared, plus which credits are realistically usable versus which just look good on paper.
Bilt Obsidian vs Amex Gold: Rent Rewards vs Food Rewards
Bilt Obsidian ($95) and Amex Gold ($325) solve different problems — one earns on rent, the other on dining and groceries. Here’s how the math works.
2-Card vs 5-Card Wallets: A Four-Profile Solver Report
We ran the live solver across four stated spending profiles at a 2-card limit and a 5-card limit, then reported the modeled net-value difference.
The 2026 Annual Fee Wave: Sapphire Reserve, Amex Platinum, and What It Means for Your Setup
Premium card fees jumped sharply — CSR to $795, Amex Platinum to $895. Here’s the new break-even math and how to decide whether to keep, downgrade, or switch.
Flat 2% Cards vs Category Cards: When Simple Wins
A flat 2% card beats complex category setups more often than enthusiasts admit — but loses badly in specific spending patterns. Here’s where the line is.
Understanding Spending Caps and Tiered Earn Rates
Many bonus rates have spending limits. How caps, tiers, and choose-your-category cards work — and how to model around them.
Comparing $0 Annual Fee Card Combinations
You don’t need to pay annual fees to earn strong rewards. These example 2-3 card setups cost nothing to hold and are modeled against stated spending profiles.
Cash Back vs Travel Rewards: Comparing Strategies
Simple cash back or transferable travel points? We compare the math, the personality fit, and the conditions under which each strategy may fit.
When Is an Annual Fee Card Worth It? The Break-Even Math
An annual fee card may earn more under one spending profile and less under another. Here’s how to calculate whether it pays for itself under your assumptions.
Credit Card Points for Beginners: What They Are, How They Work, and How to Use Them
New to credit card rewards? This guide covers everything — point currencies, transfer partners, redemption strategies, and how to avoid common mistakes.
Amex Gold vs Citi Strata Premier vs Chase Sapphire Preferred: Mid-Tier Rewards Comparison
Three mid-tier rewards cards compared head-to-head. We break down earn rates, transfer partners, and the math behind each card.
Capital One Savor vs Amex Blue Cash Everyday: Comparing No-Fee Cash Back Cards
Two $0-fee cash back cards compared: the Savor’s 3% dining/grocery/streaming combo vs the BCE’s 3% gas/grocery/online combo. We do the math.
How to Model Credit Card Rewards: A Systematic Strategy
A systematic approach to comparing credit card rewards under stated spending and redemption assumptions.
How OptimalCardSetup Models Your Credit Card Setup
A deep dive into the CP-SAT solver, integer programming, and how we distinguish proven-optimal results from the strongest valid setup found within a time limit.
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