battles / Subscriptions
Firmhouse vs Subbyx
Firmhouse ($250/mo/mo, vibe code 5/10) vs Subbyx ($250/mo/mo, vibe code 6/10). Subbyx is the easier one to rebuild yourself — here is what you lose either way.
Subscriptions
$250/mo/mo
- MVP
- 2 weeks
- Full replacement
- 6-12 months due to payment gateway tokenization, SEPA direct debit workflows, and rental return logic
Subscriptions
$250/mo/mo
- MVP
- 2-3 weeks
- Full replacement
- 3-4 months
easier to rebuild
get the build prompt →price gap / year
usage-based
running both / year
$6,000/mo
our call
Start with Subbyx — highest vibe code, weakest moat.
Firmhouse
While basic recurring checkout can be hacked together with Stripe Billing in a few days, Firmhouse handles complex EU payment methods (iDEAL to SEPA Direct Debit transitions), dunning, product swaps, and rental asset states. Rebuilding the billing cron jobs is easy; handling failed payment retries, mandate regulations, and payment gateway token migrations without churn is hard.
you can rebuild
- Hosted customer self-serve portal for pausing or skipping orders
- Basic recurring billing schedule creation and calendar management
- Product swap and frequency update controls
- Email notifications for upcoming charges and renewal receipts
- Discount code application for recurring orders
what you lose
- Out-of-the-box iDEAL-to-SEPA Direct Debit payment conversion flows
- Battle-tested automated dunning workflows designed for EU banking rules
- Pre-built Shopify subscription checkout widgets and portal embedding
- Rental lifecycle management tracking asset returns and maintenance statuses
- Zero-maintenance payment gateway token synchronization across providers
real moats
- Payment Gateway Token Lock-in (migrating Stripe/Mollie recurring tokens carries card churn risk)
- EU Regulatory & Banking Edge Cases (SEPA mandate timing, pre-notifications, GDPR audit logs)
- Operational Integrations (syncing recurring orders into 3PL fulfillment systems reliably)
open source escape hatches
- Lago AGPL-3.0
- Kill Bill Apache-2.0
- Active Merchant / Pay MIT
Subbyx
Building a basic Shopify subscription widget and customer portal using Shopify's native APIs is simple with modern AI tools. However, replicating robust payment retry logic, third-party app integrations (Klaviyo/Gorgias), and data migration tools makes a full custom replacement high-maintenance.
you can rebuild
- Product page subscription purchase option widget
- Customer self-service portal (pause, skip, swap, cancel)
- Basic recurring billing scheduling via Shopify Selling Plan API
- Simple email notifications for upcoming recurring charges
- Merchant dashboard for subscription plan configuration
what you lose
- Out-of-the-box integrations with Klaviyo, Attentive, and Gorgias
- Automated dunning smart retries for failed credit card charges
- Turnkey migration scripts to transfer customer payment tokens from other platforms
- Pre-built cancellation flow surveys with conditional discount logic
- PCI-compliant customer portal updates for payment methods
real moats
- Pre-built integrations with major D2C marketing platforms (Klaviyo, Gorgias, Attentive).
- Battle-tested dunning algorithms optimized over millions of historical rebill attempts.
- Turnkey migration utilities for importing contracts from Recharge, Bold, or Skio.
Questions people ask
Which is easier to rebuild with AI, Firmhouse or Subbyx?
Subbyx. 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 3-4 months.
Which one costs less, Firmhouse or Subbyx?
Firmhouse at $250/mo/mo for a typical mid-market store. The gap between the two is about usage-based a year.
What do I lose if I replace Firmhouse?
Out-of-the-box iDEAL-to-SEPA Direct Debit payment conversion flows Battle-tested automated dunning workflows designed for EU banking rules Pre-built Shopify subscription checkout widgets and portal embedding
What do I lose if I replace Subbyx?
Out-of-the-box integrations with Klaviyo, Attentive, and Gorgias Automated dunning smart retries for failed credit card charges Turnkey migration scripts to transfer customer payment tokens from other platforms
More battles
One e-commerce SaaS teardown every week.
Honest verdicts, build prompts and overlooked vertical SaaS opportunities. No tracking pixels, no drip sequence, unsubscribe in one click.
free forever · no third-party tracking · the prompts stay public