5 Best Buy Now, Pay Later Apps: Klarna vs Affirm vs Afterpay

Klarna is the name everyone knows in buy now, pay later. It is not the strongest company in the category on our numbers. Affirm scores 64 in the StartupHub directory against Klarna's 59, despite Klarna having raised nearly five times as much capital. That gap is the most useful thing in this comparison, and no BNPL roundup that ranks by brand recognition will show it to you.

StartupHub.ai tracks these as companies, so this runs on funding, headcount and our 0-100 score rather than on which logo you have seen at checkout most often. Screenshots were captured on 5 August 2026.

First, the Thing That Matters More Than Any Ranking

Buy now, pay later is credit. It is marketed as a payment method, it appears at checkout beside your card, and the language is deliberately soft, but you are borrowing money and agreeing to a repayment schedule.

That has consequences worth knowing before you pick a provider rather than after:

• Missed payments can cost you. Late fees, and in some cases interest, apply depending on the plan and provider.
• Some plans are reported to credit bureaus. Whether a given plan affects your credit file varies by provider, product and country. It is not safe to assume it does not.
• Longer plans often carry interest. The headline "pay in 4, interest free" product is not the same as the 12 or 24 month financing offered on larger purchases.
• Regulation is tightening. BNPL has moved steadily toward being regulated as consumer credit in the UK, EU and US, and the rules differ by market.

Check the specific plan's terms at checkout every time. The provider matters less than which product you are being offered.

1. Affirm: The Strongest Company on Our Numbers

Affirm scores 64, the highest here. Founded 2012 in San Francisco, roughly 3,097 employees, about $1.87 billion raised. It is publicly listed.

Affirm's positioning has always been the least coy in the category: it presents itself as financing, advertises no hidden fees, and offers a "check my purchasing power" flow before you shop rather than only at checkout. Longer-term plans may carry interest, which it states upfront instead of burying.

Best for: larger US purchases where you want the financing terms visible before you commit.

2. Afterpay: Simplest Pay-in-Four

Afterpay scores 61. Founded 2014 in Melbourne, about $1.01 billion raised, and now part of Block. It trades in the UK under the Clearpay brand.

Afterpay stayed closest to the original BNPL idea: split a purchase into four, pay over six weeks, no interest on the standard product, with late fees if you miss. That simplicity is the appeal. There is less to misread than with a provider offering both short instalments and long financing under one brand.

Best for: smaller retail purchases where you want one predictable structure and no interest on the standard plan.

3. Klarna: The Biggest Brand and the Broadest Product

Klarna scores 59. Founded 2005 in Stockholm, around 5,000 employees, roughly $9.44 billion raised: by far the most capital in this comparison, and more than five times Affirm's total.

Klarna is also the broadest product. It is no longer just a checkout instalment option but a shopping app with browsing, price tracking and a card, and it splits into shopper and business sides. That breadth is genuinely useful and it is also the reason to read carefully: "pay in 4" and longer financing sit under the same brand, and they are not the same deal.

Worth noting that Klarna runs a permanent phishing warning across the top of its own homepage, cautioning that scammers impersonate Klarna by email, SMS and phone. When a company that size keeps that banner up, treat unexpected "Klarna" messages accordingly and go to the app directly rather than following a link.

Why does it score below Affirm? The StartupHub Score weights capital efficiency and traction alongside scale. Klarna has raised roughly five times what Affirm has while operating a larger, more diversified and more capital-hungry business. It is the bigger brand. Affirm is currently the tighter company on the metrics we track.

Best for: shoppers who want the widest merchant acceptance and are comfortable checking which Klarna product they are being offered.

4. Sezzle: Best for Building Credit While You Pay

Sezzle scores 56. Founded 2016 in Minneapolis with about 431 employees and roughly $285 million raised, it targets shoppers who want instalments plus credit-building features, which is a real differentiator if building a file is part of your goal.

5. Zip: The Smallest of the Five

Zip scores 54, the lowest here. It is the smallest operation in this comparison and worth considering mainly where it has merchant coverage the larger names lack.

Neither is a bad product. Both are simply much smaller companies than Affirm, Klarna and Afterpay, and merchant acceptance follows scale.

Also worth knowing: PayPal

PayPal scores 77, the highest of any company mentioned on this page, but it is not a BNPL specialist: it is a payments giant founded in 1998 with nearly 37,000 employees that added Pay in 4 to an existing checkout position.

That is exactly its advantage. If you already use PayPal, the instalment option appears without onboarding to a new provider or handing your details to another company. Its score is not a verdict on the BNPL product specifically, and it belongs in the comparison for convenience rather than as the strongest instalment product.

Comparison Table

StartupHub Scores and company data as tracked in the StartupHub.ai directory. PayPal (score 77) is excluded from the table as a general payments company rather than a BNPL specialist.

Frequently Asked Questions

Which buy now pay later app is best?

On our company data, Affirm is the strongest at a StartupHub Score of 64, ahead of Afterpay at 61 and Klarna at 59. In practice the right answer depends on the purchase: Affirm for larger items where you want the financing terms visible upfront, Afterpay for simple pay-in-four on smaller retail, Klarna for the widest merchant acceptance.

Does buy now pay later affect your credit score?

It can. Whether a specific plan is reported to credit bureaus depends on the provider, the product and your country, and longer financing plans are more likely to be reported than short interest-free instalments. Missed payments are the bigger risk. Do not assume a plan is invisible to your credit file: check the terms of the specific plan at checkout.

Is Klarna better than Affirm?

Klarna is the bigger brand with wider merchant acceptance and a broader app. Affirm scores higher in our directory at 64 against 59, having raised about a fifth of Klarna's capital, which points to a tighter business on the metrics we track. For a large purchase, Affirm's upfront presentation of financing terms is the more transparent experience.

Is buy now pay later a loan?

Yes. It is consumer credit presented as a payment option. You receive goods now and owe scheduled repayments, with fees or interest if you miss them or choose a longer plan. Regulators in the UK, EU and US have been moving BNPL toward the same treatment as other consumer credit for exactly this reason.

Final Verdict

Affirm is the strongest company here on our numbers and the most transparent about the fact that it is lending you money. Afterpay is the cleanest simple option for smaller purchases. Klarna has the widest acceptance and the broadest app, and it is the one where you most need to check which product you are being offered, because pay-in-four and multi-year financing share a brand.

The honest advice for all of them: BNPL is at its best on a purchase you could already afford, used to smooth timing rather than to reach something out of budget. Used the other way, the provider you picked will not be what determines the outcome.