Head to head
Checkout.com vs Square
As a payments API, Square rates higher on the APIbenchmarks Index, 85.9 to 76.6, a 9.3-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | Checkout.com | Square |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 76.6 | 85.9 |
Specifications
| Checkout.com | Square | |
|---|---|---|
| Best for | Enterprise unified payments API | Omnichannel (online + in-person) payments |
| Free tier | Self-serve sandbox test account; live pricing sales-quoted | Free APIs/SDKs + sandbox; sellers pay per transaction |
| Pricing | Custom (flat or interchange++) | Per transaction (2.6% + $0.15 in-person) |
| Official SDKs | 11 languages | 12 languages |
Is Checkout.com better than Square?
On the APIbenchmarks Index, Square rates higher (85.9 vs 76.6). It leads on the four weighted criteria, but price is reported separately, so the best choice still depends on your budget.
Verdict in one line
Square leads by 9.3 points (85.9 vs 76.6) and wins 3 of 4 criteria; Checkout.com wins 1.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 84 | 86 | |
| Reliability | 88 | 86 | |
| Ecosystem & SDKs | 76 | 84 | |
| Accessibility | 52 | 88 |
Choose Checkout.com if… / choose Square if…
- →reliability matters most to you (88 vs 86)
- →your use case matches its focus: enterprise unified payments api
- →documentation & dx matters most to you (86 vs 84)
- →ecosystem & sdks matters most to you (84 vs 76)
- →accessibility matters most to you (88 vs 52)
- →you need broad SDK coverage (12 official SDKs vs 11)
- →your use case matches its focus: omnichannel (online + in-person) payments
Pricing side by side
- Model
- Custom (flat or interchange++)
- Free tier
- Self-serve sandbox test account; live pricing sales-quoted
- Interchange++ (IC++)Custom quote
- Flat-rate (blended)Custom quote
- Charity pricingFree processing
- Model
- Per transaction (2.6% + $0.15 in-person)
- Free tier
- Free APIs/SDKs + sandbox; sellers pay per transaction
- Square Free$0/mo
- Square Plus$49/mo
- Square Premium$149/mo
- Online API2.9% + 30¢
- ACH via API1%, $1 min, $5 cap
- Custom / EnterpriseCustom
Vendor-published pricing, verified 2026-06-27 (Checkout.com) and 2026-06-27 (Square).
SDK and language coverage
Both · 7
Node.jsPythonJavaPHPRuby.NETGo
Only Checkout.com · 4
iOS (Frames/Flow)Android (Frames/Flow)React NativeJavaScript (browser / Frames)
Only Square · 5
Web Payments SDK (JavaScript)In-App Payments SDK (iOS)In-App Payments SDK (Android)React Native pluginMobile Payments / Terminal SDK
Strengths and weaknesses
- +Interchange++ pricing gives full transparency into interchange, scheme fees, and the processor's margin
- +Intelligent Acceptance AI measurably lifts authorization rates (reported up to +9.5pp in beta; +1.9% for NordVPN)
- +Strong global coverage of card schemes plus local payment methods, wallets, and bank transfers
- –No publicly published rates; pricing is entirely quote-based and requires contacting sales
- –Integration can feel technical and benefits from dedicated developer resources
- –Support can be slower than expected for smaller or lower-priority issues
- +Single API and account unifies online, in-app, and in-person (omnichannel) payments
- +Transparent flat-rate pricing with no monthly fee, PCI fee, or minimums on the free tier
- +Broad payment-method support: cards, Apple/Google/Cash App Pay, ACH, Afterpay, gift cards
- –Risk-driven account freezes and fund holds with little notice are a recurring, serious complaint
- –Phone support limited to first 90 days; slow, hard-to-escalate help for complex issues
- –Flat-rate pricing becomes expensive at high volume versus interchange-plus processors
Checkout.com vs Square: questions
- Which has better documentation, Checkout.com or Square?
- Square scores higher on documentation and developer experience: 86 vs 84 out of 100.
- Which is more reliable, Checkout.com or Square?
- Checkout.com scores higher on reliability: 88 vs 86 out of 100.
- Do Checkout.com and Square have a free tier?
- Checkout.com: yes (Self-serve sandbox test account; live pricing sales-quoted). Square: yes (Free APIs/SDKs + sandbox; sellers pay per transaction).
- How are Checkout.com and Square priced?
- Checkout.com: Custom (flat or interchange++). Square: Per transaction (2.6% + $0.15 in-person).
- Which has more official SDKs?
- Square lists 12 official SDKs, Checkout.com lists 11.