BNPL Comparison 2026
Both are top-tier BNPL apps — but they serve very different shoppers. Klarna wins on breadth; Affirm wins on transparency for big purchases.
Best for everyday online shopping — Pay in 4 always 0%, Pay in 30 days, browser extension for any store, and the widest merchant network.
Best for big purchases — Amazon and Walmart integrations, longer terms up to 60 months, higher limits, and upfront rate disclosure before you commit.
| Feature | Klarna | Affirm |
|---|---|---|
| Pay in 4 (0% interest) | ✓ | ✓ (select stores) |
| Pay in 30 days | ✓ | ✗ |
| Monthly financing terms | 6–36 months | 3–60 months |
| Interest rate range | 0%–33.99% APR | 0%–36% APR |
| Rate shown before checkout | Partial | Always |
| Amazon integration | ✗ (virtual card) | ✓ (official partner) |
| Walmart integration | ✗ | ✓ |
| Browser extension | ✓ | ✗ |
| Partner stores | 500,000+ | 300,000+ |
| Max spending limit | Varies | Up to $17,500 |
| Late fees | Up to $7 | None |
| Credit check (Pay in 4) | Soft only | Soft only |
| In-store payments | ✓ | ✓ |
| App rating (iOS) | 4.7★ | 4.9★ |
This is the biggest difference between these two apps. Klarna's Pay in 4 and Pay in 30 are always free — no exceptions, no rate tiers. If you stick to those options, you will never pay interest.
Affirm charges 0%–36% APR depending on the merchant, your credit profile, and the loan term selected. At Amazon and Walmart, Affirm regularly offers 0% promotions. At other stores, expect rates from 10%–29% APR for monthly plans. The key upside: Affirm shows you the exact rate and total cost before you confirm — no surprises after checkout.
Bottom line: if 0% is your non-negotiable, Klarna's Pay in 4 is simpler. If you need a longer term and can tolerate some interest for a large purchase, Affirm's transparency makes it the safer choice over Klarna's monthly financing option.
Affirm is Amazon's official BNPL partner. That means you can split Amazon purchases into monthly payments directly at Amazon checkout — no extra apps, no workarounds. For Prime members who spend heavily on Amazon, this integration alone may justify using Affirm over Klarna.
Affirm also has native integrations at Walmart, Target, Best Buy, Peloton, Apple, and hundreds of major US retailers. These integrations often come with exclusive 0% APR promotions that aren't available through Klarna.
Klarna can still be used at Amazon via its virtual card, but you lose the native checkout experience and the 0% promotional rates that Affirm negotiates directly with these partners.
Affirm is one of the only major BNPL apps that charges zero late fees. If you miss a payment, you won't be hit with a penalty — though missed payments can still affect your credit for longer-term loans and will pause your ability to make new purchases.
Klarna charges up to $7 per late payment. That's lower than Afterpay ($8) but still a real cost if you miss multiple payments. For users who are occasionally late on bills, Affirm's no-late-fee policy is a meaningful difference.
The tradeoff: because Affirm doesn't charge late fees, it compensates through interest rates on financed purchases. For shorter Pay in 4 plans, neither late fees nor interest are major concerns — the real risk is with longer financing terms.
For most shoppers, keep both. Use Klarna for Pay in 4 and Pay in 30 on everyday purchases. Use Affirm when you're buying something big at Amazon, Walmart, or a major retailer — especially when a 0% promotional offer is available.