battles / Platforms
Swell vs Sylius
Swell ($599/mo/mo, vibe code 5/10) vs Sylius ($1,200/mo/mo, vibe code 6/10). Sylius is the easier one to rebuild yourself — here is what you lose either way.
Platforms
$599/mo/mo
- MVP
- 2-3 weeks
- Full replacement
- 9-15 months
Platforms
$1,200/mo/mo
- MVP
- 2-3 weeks
- Full replacement
- 9-15 months
easier to rebuild
get the build prompt →price gap / year
$7,212/mo
running both / year
$21,588/mo
our call
Start with Sylius — highest vibe code, weakest moat.
Swell
A headless commerce API is a well-understood build. What Swell sells is not having to run it: uptime, dashboard, subscription billing and payment plumbing maintained by someone else.
you can rebuild
- Products, variants and pricing rules via API
- Cart, checkout session and order APIs
- Customer accounts and saved payment methods
- Webhook events for downstream systems
- A basic merchant dashboard
what you lose
- A maintained subscription billing engine with retries and dunning
- Hosted uptime and scaling during traffic spikes
- Prebuilt payment, tax and shipping integrations
- A dashboard non-developers can operate
real moats
- Maintained integrations across payments, tax and shipping
- Subscription billing correctness accumulated across merchants
- Operational reliability you would otherwise staff for
Sylius
Sylius is free; what you pay for is the Plus licence, the Symfony expertise and years of hardened cart, promotion and taxation code. An AI can generate a comparable core in weeks, but promotion rules and multi-channel pricing are where custom builds rot.
you can rebuild
- Catalog, taxon tree and product variant/option modelling
- Cart and checkout state machine with address and shipping steps
- Order, payment and shipment records with status transitions
- Admin CRUD screens for products, orders and customers
- Channel-based multi-currency and multi-locale storefronts
what you lose
- A battle-tested promotion engine with rule/action composition
- Symfony ecosystem bundles (workflow, security, messenger) already wired together
- The Sylius Plus features: RMA, multi-source inventory, B2B partner accounts
- A large pool of agencies and developers who already know the codebase
- Upstream security patches and LTS upgrade paths
real moats
- Agency and developer familiarity with the Symfony/Sylius conventions
- Plugin ecosystem covering payments, ERP connectors and marketplaces
- Years of edge cases baked into the promotion, tax and shipping engines
open source escape hatches
- vendure-ecommerce/vendure MIT
- medusajs/medusa MIT
- saleor/saleor BSD-3
Questions people ask
Which is easier to rebuild with AI, Swell or Sylius?
Sylius. It scores 6/10 on vibe code with a moat of 4/10, so an AI-assisted MVP takes about 2-3 weeks and a full replacement about 9-15 months.
Which one costs less, Swell or Sylius?
Swell at $599/mo/mo for a typical mid-market store. The gap between the two is about $7,212/mo a year.
What do I lose if I replace Swell?
A maintained subscription billing engine with retries and dunning Hosted uptime and scaling during traffic spikes Prebuilt payment, tax and shipping integrations
What do I lose if I replace Sylius?
A battle-tested promotion engine with rule/action composition Symfony ecosystem bundles (workflow, security, messenger) already wired together The Sylius Plus features: RMA, multi-source inventory, B2B partner accounts
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