Square vs Stripe for Solo Developers

Comparing Square and Stripe for solo developers. In-person commerce vs developer-first online payments. Features, pricing, and the honest verdict.

Quick Comparison

Feature	Square	Stripe
Type	All-in-one commerce platform with POS hardware	Developer-first online payments API
US online API rate	2.9% + 30c (Web Payments SDK / Checkout API)	2.9% + 30c per successful transaction
US in-person rate	2.6% + 15c card-present on Square Free	2.7% + 5c via Terminal, plus 10c per Tap to Pay auth
Manual / keyed entry	3.5% + 15c	2.9% + 30c (no separate keyed tier)
Monthly platform fee	None on Square Free (Plus tier exists, 30-day trial)	None, no setup or monthly fees
Latest server SDK	square 44.1.0 on npm (2026-05-20)	stripe 22.2.0 on npm (2026-05-27)
npm weekly downloads	about 205,570 (square)	about 11.93 million (stripe)
Learning Curve	Easy	Moderate
Best For	Devs building anything with an in-person component	Devs building pure online SaaS or marketplaces
Solo Dev Rating	7/10	9/10

Square Overview

Square started as an in-person card-reader company and grew into a full commerce platform. The POS hardware, the seller dashboard, the inventory management, and the online store are all under one account. For any business with a physical component, Square is the most coherent single-vendor stack you can pick.

Square's developer APIs have improved a lot. You can build custom checkout flows, integrate with their catalog, handle subscriptions, and even build apps on top of their POS. The docs are decent and the SDKs cover the major languages. It's no longer the obvious second choice for pure online payments, though Stripe still has a wider feature set there.

For solo developers, Square's appeal is the bundle. If you're building a product that involves any in-person commerce, gift cards, or local services, Square gives you the hardware, the dashboard, and the APIs in one account at one bill. The hardware works out of the box and the staff app on iPad is genuinely good.

Stripe Overview

Stripe is the developer-first online payments platform that became the default for indie SaaS, marketplaces, and any software-driven commerce over the last decade. The API is excellent. The docs are excellent. The dashboard is excellent. Almost every payment problem a solo dev is going to encounter has a Stripe-shaped solution already documented.

Beyond basic charges, Stripe offers subscriptions via Billing, customer portals, tax handling via Stripe Tax, invoicing, Connect for marketplaces, Issuing for virtual cards, Identity for KYC, Atlas for incorporation, and Capital for cash advances. The breadth is enormous and almost all of it works well together.

Stripe's pricing is straightforward at 2.9% + 30 cents per online transaction in the US, with regional variations. There are no monthly fees and no minimums. You only pay when you actually charge a card, which is exactly the right model for a solo dev who might not earn anything for the first few months.

Key Differences

Stripe is online-native. Square is in-person-native. Both have crossed over into the other's territory, but their DNA shows. Stripe's online flows, subscription handling, and developer experience are still better than Square's. Square's in-person hardware, POS, and inventory management are still better than Stripe's. Pick based on where most of your transactions will happen.

Stripe's developer experience is in a different league. The Stripe API is one of the best-designed APIs in the industry. The webhooks work, the test mode is reliable, the SDKs are first-class. Square's APIs are competent but less polished. For a solo dev who needs to integrate payments into a custom application, Stripe will save you days of friction.

Square charges less for in-person transactions. Square's in-person rate is 2.6% + 15 cents on the free plan versus Stripe's 2.7% + 5 cents through Terminal. The percentage favors Square, the fixed fee favors Stripe, so which wins depends on your average ticket size. On a $40 sale Square costs $1.19 and Stripe costs $1.13, so they are close enough that hardware quality usually decides it. Square also has better hardware. If you need a card reader on a counter, Square's options are more refined. Note that Stripe adds 10 cents per authorization when you use Tap to Pay on a phone.

Subscription billing is more mature on Stripe. Stripe Billing handles recurring revenue, proration, dunning, upgrades and downgrades, tax, invoicing, and customer self-service portals. Square has subscription support but it's less feature-complete and less developer-friendly. For SaaS specifically, Stripe is the right answer almost always.

International support is different. Stripe operates in many more countries than Square and is the easier choice for international businesses. Square has expanded internationally but coverage is narrower. If you're a solo dev outside the US, UK, Canada, or Australia, Stripe is probably the only one of the two that even serves your country.

By the Numbers (2026)

These figures were checked on 2026-05-29 against the vendors' own pages and the public npm registry.

Stripe

Online card payments are 2.9% + 30 cents per successful transaction for domestic US cards, with international cards adding 1.5% and currency conversion adding 1%.
In-person via Terminal is 2.7% + 5 cents for domestic cards, and Tap to Pay adds 10 cents per authorization.
There are no setup fees, monthly fees, or minimums.
Stripe Billing is 0.7% of billing volume pay-as-you-go, or a plan starting at $620 per month on a one-year contract.
Stripe Tax is 0.5% per transaction where you are registered on the no-code Basic plan, or $0.50 per transaction on the API plan.
Connect adds a 0.25% starting fee for platforms that deploy their own payments pricing.
The official Node SDK (stripe) is version 22.2.0, published to npm on 2026-05-27, and pulls about 11.93 million downloads per week. The stripe-node repository has about 4,428 GitHub stars and stripe-python has about 2,007.

Square

The online API rate (Web Payments SDK, Checkout API, Invoices API) in the US is 2.9% + 30 cents.
In-person card-present via the Mobile Payments SDK, Point of Sale API, or Square Terminal is 2.6% + 15 cents on the free plan. The Plus tier drops this to 2.5% and Premium to 2.4%.
Manually keyed, card-not-present transactions are 3.5% + 15 cents.
The hosted online store on the free plan is 3.3% + 30 cents, which is higher than the API rate, so building checkout yourself with the API actually costs less per charge.
ACH bank transfer on invoices is 1% with a $1 minimum.
Square APIs and SDKs are free to use with no monthly charges or additional processing fees beyond the per-transaction rates.
The official Node SDK (square) is version 44.1.0, published to npm on 2026-05-20, and pulls about 205,570 downloads per week. The square-nodejs-sdk repository has about 111 GitHub stars and square-python-sdk has about 114.

The download and star gap is the clearest single signal of where the developer community lives. Stripe's Node SDK sees roughly 58 times the weekly install volume of Square's, which translates into more Stack Overflow answers, more blog posts, and more LLM training data when you ask an assistant to scaffold a checkout.

Real Cost at Solo-Dev Scale

Take a common solo-dev workload of $5,000 in monthly online card volume spread across 100 transactions averaging $50 each. Both platforms charge the same headline online rate, so the processing math is identical.

Percentage fee: 2.9% of $5,000 is $145.00
Per-transaction fee: 100 charges times 30 cents is $30.00
Total online processing per month: $175.00 on both Stripe and Square

So at the raw charge level there is no winner. The real cost difference shows up once you add the layers a SaaS actually needs.

If that $5,000 is recurring subscription revenue, Stripe Billing on the pay-as-you-go plan adds 0.7% of billing volume, which is another $35.00 per month, bringing Stripe to $210.00. Square does not bill a separate percentage for its built-in subscription support, so its subscription path can stay at $175.00. That makes Square the cheaper subscription rail on paper.

The catch is that Stripe Billing buys you proration, dunning, upgrade and downgrade flows, hosted invoices, and a customer self-service portal out of the box. Replicating those on Square's thinner subscription feature set is engineering time, and for a solo dev one weekend of unpaid work usually costs more than $35 a month. If you add Stripe Tax at 0.5% per transaction you are at another $25.00 per month, pushing a fully managed Stripe SaaS stack to about $235.00 against Square's roughly $175.00 plus your own time.

The honest read is that Stripe costs more per dollar once you turn on its managed layers, and that premium is usually worth it because it replaces code you would otherwise write and maintain alone. If your product is plain one-off charges with no subscriptions or tax automation, the two are a dead heat at $175.00 and you should pick on developer experience, not price.

When to Choose Square

Your business involves in-person sales, services, or hardware
You want POS, inventory, and payments under one account
You're running a local services business as your side project
Hardware like card readers or terminals are part of your setup
Predictable bundled pricing matters more than API depth

When to Choose Stripe

You're building a pure online product, SaaS, or marketplace
You want the best-in-class developer experience and API
Subscriptions, billing, and customer portals are part of your stack
You're outside the US and need broader international support
You want access to a deep ecosystem of payment-adjacent products

The Verdict

For the typical solo developer audience reading this, Stripe is the answer almost every time. If you're building SaaS, marketplaces, digital products, or anything that lives entirely online, Stripe's developer experience and feature depth are why it became the default. Subscriptions alone are reason enough.

Square is the right answer in one specific situation, which is when your business has any real in-person component. If you're a developer who also runs a coffee cart, a side hustle reselling vintage gear at markets, or a service business that needs to take cards at the customer's location, Square's hardware and POS experience are worth choosing it for. The Square developer APIs are good enough that you can still build custom integrations on top.

The honest take is that this is not a head-to-head decision. Stripe and Square serve different problems even though both technically process card payments. Pick based on where the swipe happens, not based on the brand. For online-only, Stripe. For anything in person, Square. If you somehow need both, use both, since their account systems are separate enough that running them in parallel is fine.