Burst FSA/HSA vs Flex Extensions
Two Shopify apps, side by side: detected stores, momentum, reviews, plans, listed features and who runs each. Store counts as of Nov 13, 2026.
The short answer
- Flex Extensions lists 4 features Burst FSA/HSA’s listing doesn’t mention, including Editor tool, Snippets, Templates.
Head to head
- United States
- Canada
- Hong Kong
Standard
Coverage counts what each App Store listing names. Every feature, checked off app by app, is in Shoplist.
See every featureLet shoppers use their FSA/HSA dollars without changing how they check out. Burst identifies eligible products in your catalog, shows shoppers an eligibility badge on product pages and at checkout, and gives them what they need to claim reimbursement from their FSA/HSA account after purchase. Compliance is handled by Burst. Works with express checkout and recurring orders.
Flex Extensions (formerly Flex Marketing) works alongside the Flex Payments app to bring HSA/FSA to your Shopify store. It syncs your products to Flex and keeps HSA/FSA eligibility up to date across your catalog. Use the included template blocks to quickly add branding and an information modal that explains to your customers how they can unlock their HSA and FSA cards on your site.
- Express Checkout Compatible – Works with your store's express checkout buttons.
- Recurring Orders Supported – Native FSA/HSA support on repeat purchases.
- Automated Compliance Engine – Reimbursements + LMNs managed post-purchase.
- Promote eligible products with badges, banners, modals, and more
- Access pre-built assets directly in your theme customizer
- Highlight eligibility directly on product pages
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 |  Flex Extensions | |
|---|---|---|
| Detected stores | Not published | 440 |
| Net store change, 28 days | 0 | +41 |
| Stores added, 28 days | Not enough data | 41 |
| Big-brand share | Not enough data | 28% |
| Top store categories | Not published | Health & Beauty, Sporting Goods, Apparel & Accessories |
| Top store countries | Not published | United States, Canada, Hong Kong |
Reviews
| Measure | Flex Extensions | |
|---|---|---|
| App Store rating | Not published | Not published |
| App Store reviews | Not published | Not published |
| New reviews, 28 days | Not enough data | Not enough data |
| Reviewers a year or more in | Not enough data | Not enough data |
Pricing
| Measure | Flex Extensions | |
|---|---|---|
| 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 | 1 | Not published |
Listing
| Measure | Flex Extensions | |
|---|---|---|
| Shopify category rank | Not enough data | #42 |
| Shopify App Charts | Not on this week’s charts | #22 in Page builder |
| Built for Shopify | No | No |
| Launched | Nov 13, 2026 | May 21, 2025 |
| Languages | 1 | 1 |
| Developer | Burst Group, Inc. | Flex |
FAQ
Burst FSA/HSA and Flex Extensions: common questions
- What features does each app list that the other doesn’t?
- Flex Extensions lists 4 the others don’t mention, such as Editor tool, Snippets, Templates, Theme sections. 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 13, 2026; 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 13, 2026. 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.