battles / Subscriptions
PayWhirl vs Subbyx
PayWhirl ($149/mo/mo, vibe code 6/10) vs Subbyx ($250/mo/mo, vibe code 6/10). PayWhirl is the easier one to rebuild yourself — here is what you lose either way.
Subscriptions
$149/mo/mo
- MVP
- 1-2 weeks
- Full replacement
- 3-6 months, due to complex dunning edge cases, gateway tokenization, and Shopify Selling Plans API maintenance
easier to rebuild
get the build prompt →Subscriptions
$250/mo/mo
- MVP
- 2-3 weeks
- Full replacement
- 3-4 months
price gap / year
$1,212/mo
running both / year
$4,788/mo
our call
Start with PayWhirl — highest vibe code, weakest moat.
PayWhirl
If running a custom application using Stripe, PayWhirl is redundant because Stripe Billing handles subscriptions natively. If running on Shopify, PayWhirl provides turnkey integration with Shopify's Subscription Contracts API, which requires significant plumbing to recreate safely.
you can rebuild
- Customer portal for skipping, pausing, or canceling subscriptions
- Recurring billing schedule generator
- Product swap and frequency adjustment UI
- Transactional payment reminder emails
- Order generation on successful payment cycles
what you lose
- Zero-code setup for non-technical store managers
- Turnkey alignment with Shopify's native Selling Plans API
- Multi-gateway fallback and vaulting infrastructure
- Pre-built PCI-compliant payment widget embeds
- Out-of-the-box dunning workflow configuration and retry logic
real moats
- Deep platform API integration maintenance (e.g. Shopify GraphQL changes)
- Payment gateway vaulting abstraction
- Turnkey compliance with customer-facing subscription governance regulations
open source escape hatches
- Lago AGPL-3.0
- Kill Bill Apache-2.0
- Stripe Billing + Custom Portal 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, PayWhirl or Subbyx?
PayWhirl. It scores 6/10 on vibe code with a moat of 3/10, so an AI-assisted MVP takes about 1-2 weeks and a full replacement about 3-6 months, due to complex dunning edge cases, gateway tokenization, and Shopify Selling Plans API maintenance.
Which one costs less, PayWhirl or Subbyx?
PayWhirl at $149/mo/mo for a typical mid-market store. The gap between the two is about $1,212/mo a year.
What do I lose if I replace PayWhirl?
Zero-code setup for non-technical store managers Turnkey alignment with Shopify's native Selling Plans API Multi-gateway fallback and vaulting infrastructure
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