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Personal Finance · head to head

Affirm vs Increase

Affirm logo

Affirm

Personal Finance

Buy now pay later app offering short interest-free plans and longer plans that charge real APR interest

From
Free
Rated
-
Full reviewWebsite
Increase logo

Increase

APIs

Direct banking API for ACH, wires, real-time payments, accounts and cards

From
On request
Rated
-
Full reviewWebsite

The short version

  • Only Affirm has a free tier, so it costs nothing to try first.
  • Each has a real cost: Affirm longer instalment plans carry real interest, up to roughly 36 percent APR depending on the retailer, item and applicant, which is a genuine borrowing cost that the buy now pay later framing can obscure for shoppers who do not read the terms shown before accepting.; Increase the published per transaction rates exclude a monthly platform fee that Increase states varies by use case, so the transparent price page cannot produce a total cost and the material part of the deal is still negotiated privately.
  • They diverge on capability: Affirm covers Pay in 4, Increase covers ACH origination and receipt.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Affirm and Increase actually diverge.

Attributes where Affirm and Increase differ
AttributeAffirmIncrease
Starting priceFreeOn request
Pricing modelFree for short Pay in 4 plans; longer plans carry a disclosed APR up to roughly 36 percent, merchant pays a transaction feequote
Free tierYesNo
PlatformsiOS, Android, WebAPI, Web
CategoryPersonal FinanceAPIs

Identical on both: user rating (Not yet rated).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Affirm

  • Pay in 4
  • Monthly instalment loans
  • Soft credit check
  • No late fees
  • Affirm Card
  • Pre-purchase terms disclosure

Only in Increase

  • ACH origination and receipt
  • Domestic wires
  • Real-time payments
  • Bank accounts
  • Cards
  • Cheques
  • Sandbox and simulations
  • Audit and reconciliation data

What people use each for

The jobs each tool is most often brought in to do.

Affirm

  • A shopper financing a large purchase such as furniture or electronics who wants disclosed APR terms compared directly against a credit card before committingnot Increase
  • Someone using the short Pay in 4 plan for a smaller purchase who intends to pay it off within six weeks with no interestnot Increase
  • A borrower who has missed a payment before and specifically wants a lender that does not charge late feesnot Increase
  • A retailer offering point-of-sale financing to reduce cart abandonment on higher-ticket items, in exchange for paying Affirm a transaction feenot Increase

Increase

  • A payroll or treasury product that needs to originate same-day ACH and wires under its own control rather than through a payment processornot Affirm
  • A marketplace that must hold seller balances in ledgered accounts with real account and routing numbersnot Affirm
  • A fintech that wants FedNow and RTP payouts so recipients are paid outside banking hoursnot Affirm
  • An engineering team that needs the underlying return codes and settlement timing visible in order to build correct reconciliation and retry logicnot Affirm

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Affirm

  • Longer instalment plans carry real interest, up to roughly 36 percent APR depending on the retailer, item and applicant, which is a genuine borrowing cost that the buy now pay later framing can obscure for shoppers who do not read the terms shown before accepting.
  • Even with no late fees, Affirm reports many loans to credit bureaus, so a missed or late payment on a longer plan can affect a credit score in a way the marketing around interest-free short plans does not prepare shoppers for.
  • Approval and APR both vary by individual loan, so the same shopper can be offered interest-free terms on one purchase and a high APR on another, making the cost unpredictable until checkout.
  • Merchants pay a transaction fee to offer Affirm at checkout, a cost typically built into retail pricing, so shoppers who pay by other means still indirectly subsidise the option even if they never use it.
  • The Affirm Card blurs the line between buy now pay later and a general-purpose credit card, and using it for everyday spending on interest-bearing terms can compound borrowing cost in a way a single point-of-sale purchase would not.

Increase

  • The published per transaction rates exclude a monthly platform fee that Increase states varies by use case, so the transparent price page cannot produce a total cost and the material part of the deal is still negotiated privately.
  • Free allowances are deliberately small at ten account numbers and five physical cards, so any programme issuing accounts or cards at volume moves to quoted pricing almost immediately.
  • Banking is provided through partner banks, so programme approval, compliance obligations and the ability to launch at all depend on a bank relationship you do not control, and post-Synapse bank risk appetite has tightened considerably.
  • The API deliberately exposes payment rail mechanics rather than smoothing them, which is correct engineering but means a team without payments expertise will build reconciliation and return handling wrongly and only discover it when funds go astray.
  • Coverage is United States only, so a company with international payout needs runs a second provider and reconciles two ledgers, and the single API argument disappears at the first cross border customer.

Pricing, plan by plan

Affirm

Free
  • Pay in 4Free
    • No interest if paid on time over six weeks
    • No late fees for a missed payment
    • Soft credit check at application
  • Monthly instalmentsFree
    • APR disclosed before the loan is accepted, up to roughly 36 percent depending on retailer and applicant
    • Terms from three to 36 months depending on purchase amount
    • Payment history can be reported to credit bureaus

Increase

On request
  • Increase Platform$undefined/month
    • Monthly fee quoted by use case and not published
    • Next-day ACH origination listed at 0.50 US dollars per transaction
    • Same-day ACH origination listed at 2.00 per transaction

Which should you pick?

Choose Affirm if

  • You need pay in 4.
  • You want to start without paying.
  • You work on iOS, Android, Web.
  • You also want monthly instalment loans.
Affirm review

Choose Increase if

  • You need ach origination and receipt.
  • You work on API, Web.
  • You also want domestic wires.
Increase review

Questions people ask

Is Affirm or Increase better?
Neither clearly leads. Affirm starts at Free and Increase at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Affirm or Increase?
Affirm has a free tier; the other does not. Paid plans start at Free for Affirm and On request for Increase.
Does Affirm or Increase run on more platforms?
Affirm runs on iOS, Android, Web. Increase runs on API, Web.
Can I use Affirm for free?
Yes. Affirm has a free tier, so you can try it without paying. Increase starts at On request.
What is Affirm best used for?
Affirm is most often used for a shopper financing a large purchase such as furniture or electronics who wants disclosed apr terms compared directly against a credit card before committing, someone using the short pay in 4 plan for a smaller purchase who intends to pay it off within six weeks with no interest, a borrower who has missed a payment before and specifically wants a lender that does not charge late fees, a retailer offering point-of-sale financing to reduce cart abandonment on higher-ticket items, in exchange for paying affirm a transaction fee. Of those, a shopper financing a large purchase such as furniture or electronics who wants disclosed apr terms compared directly against a credit card before committing and someone using the short pay in 4 plan for a smaller purchase who intends to pay it off within six weeks with no interest are not what Increase is typically brought in for.
What can Affirm do that Increase cannot?
Affirm covers Pay in 4, Monthly instalment loans, Soft credit check, No late fees. Increase covers ACH origination and receipt, Domestic wires, Real-time payments, Bank accounts.

Answered from the vendors’ own pages

Affirm: Does Affirm always charge interest?

No, short Pay in 4 plans over six weeks are typically interest-free if paid on time; longer instalment plans of three to 36 months can carry a disclosed APR up to roughly 36 percent.

Increase: Does Increase publish its pricing?

Partly. Per transaction fees for ACH, wires, RTP, FedNow and cards are listed publicly. The monthly platform fee is not, and it is described only as varying by use case.

Affirm: Does Affirm charge late fees?

No, Affirm does not charge late fees for a missed payment, unlike some buy now pay later competitors, but missed payments can still be reported to credit bureaus.

Increase: Who holds the deposits?

Partner banks, not Increase itself. That relationship determines your programme approval, your compliance obligations and your risk if the bank changes appetite.

Affirm: Will using Affirm affect my credit score?

The initial application uses a soft credit check that does not affect your score, but Affirm reports many resulting loans to credit bureaus, so payment history on the loan itself can affect your score.

Increase: Is it international?

No. Increase covers United States rails only, so cross border payouts require a second provider.

Increase: How is it different from a middleware BaaS platform?

It exposes the rails rather than abstracting them, showing real return codes and settlement timing. That suits teams who understand payments and punishes teams who do not.

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