Flex, Pay With HSA/FSA vs PayPal Payments Studio
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 1, 2026 for Flex, Pay With HSA/FSA, Nov 13, 2026 for PayPal Payments Studio.
The short answer
- On the Shopify App Store: Flex, Pay With HSA/FSA 5.0 from 7 reviews and PayPal Payments Studio 5.0 from 1 reviews.
- PayPal Payments Studio lists 1 features Flex, Pay With HSA/FSA’s listing doesn’t mention, including Payment messages.
Head to head
- Hong Kong
- Australia
- Germany
Momentum
New reviews each month
Review pace is the clearest public read on how fast an app is winning new merchants.
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureFlex allows merchants that qualify to accept HSA/FSA as a payment option directly in the checkout flow.
Guide customers from discovery to purchase with relevant PayPal messaging and express checkout options at key moments, building confidence and driving conversion.
- Accept HSA/FSA payments directly in the checkout flow
- Auto-substantiate during checkout
- Qualify your product with a Letter of Medical Necessity
- Express checkout with PayPal
- Flexible PayPal installment options
- PayPal rewards and benefits
All the numbers
Every figure, side by side
A green dot marks the app ahead on a measured figure. Estimates, gaps and apps that leave no storefront trace never take the lead.
Adoption
| Measure |  PayPal Payments Studio | |
|---|---|---|
| Detected stores | Not published | 374 |
| Net store change, 28 days | 0 | +11 |
| Stores added, 28 days | Not enough data | 13 |
| Big-brand share | Not enough data | 18% |
| Top store categories | Not published | Apparel & Accessories, Home & Garden, Sporting Goods |
| Top store countries | Not published | Hong Kong, Australia, Germany |
Reviews
| Measure | PayPal Payments Studio | |
|---|---|---|
| App Store rating | 5.0 ★ | 5.0 ★ |
| App Store reviews | 7(ahead) | 1 |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | PayPal Payments Studio | |
|---|---|---|
| Free plan | Not listed | Not listed |
| Lowest paid monthly plan | No monthly plan listed | No monthly plan listed |
| Longest free trial | Not listed | Not listed |
| Plans listed | Not published | Not published |
Listing
| Measure | PayPal Payments Studio | |
|---|---|---|
| Shopify category rank | Not enough data | #14 |
| Shopify App Charts | Not on this week’s charts | #4 in Payment experience |
| Built for Shopify | No | No |
| Launched | Nov 15, 2023 | May 20, 2026 |
| Languages | 1 | 1 |
| Developer | Flex | PayPal, Inc. |
FAQ
Flex, Pay With HSA/FSA and PayPal Payments Studio: common questions
- Which has better reviews, Flex, Pay With HSA/FSA or PayPal Payments Studio?
- On the Shopify App Store: Flex, Pay With HSA/FSA 5.0 from 7 reviews and PayPal Payments Studio 5.0 from 1 reviews.
- What features does each app list that the other doesn’t?
- PayPal Payments Studio lists 1 the others don’t mention, such as Payment messages. A feature missing from a listing may still be supported; this compares what each App Store listing says.
- Where does this comparison’s data come from?
- Shoplist crawls Shopify storefronts to detect which apps each store runs, and reads each app’s Shopify App Store listing for reviews, pricing, features and integrations. Store counts are as of Nov 1, 2026 for Flex, Pay With HSA/FSA, Nov 13, 2026 for PayPal Payments Studio; estimated figures are labeled.
How Shoplist compares apps
Store counts come from Shoplist’s crawl of Shopify storefronts, which detects the apps each store runs; they are as of Nov 1, 2026 for Flex, Pay With HSA/FSA, Nov 13, 2026 for PayPal Payments Studio. Reviews, ratings, plans, features and integrations come from each app’s Shopify App Store listing. 28-day figures are labeled when estimated, and a figure that is missing or estimated never decides who leads. Read the methodology.