ecomrestack

battles / ERP & Inventory

ERPAG vs Fishbowl Inventory

ERPAG ($99/mo/mo, vibe code 3/10) vs Fishbowl Inventory ($500/mo/mo, vibe code 3/10). ERPAG is the easier one to rebuild yourself — here is what you lose either way.

ERPAG
KEEP

ERP & Inventory

$99/mo/mo

Vibe code3/10
Moat3/10
MVP
3 weeks
Full replacement
12-18 months, due to complex multi-level BOM explosion algorithms, inventory COGS accounting, and multi-channel sync edge cases.

easier to rebuild

get the build prompt →
Fishbowl Inventory
KEEP

ERP & Inventory

$500/mo/mo

Vibe code3/10
Moat4/10
MVP
3-4 weeks
Full replacement
12-24 months, due to complex bill of materials (BOM), accounting sync, barcode hardware integration, and multi-location valuation models.
get the build prompt →

price gap / year

$4,812/mo

running both / year

$7,188/mo

our call

Start with ERPAG — highest vibe code, weakest moat.

ERPAG

While basic inventory CRUD and simple bill of materials can be generated by AI agents in a weekend, ERPAG's real value lies in manufacturing material requirements planning (MRP), COGS inventory valuation engines, and continuous integration with accounting platforms. Building a bespoke ERP introduces enormous risk for physical stock mismatches, bad tax reporting, and broken purchasing cycles.

you can rebuild

  • Single-level Bill of Materials (BOM) definition
  • Basic purchase order generation and vendor tracking
  • Simple stock level updates and reorder threshold alerts
  • Barcode printing and basic SKU lookup
  • Manual work order creation and status tracking

what you lose

  • Multi-level automated MRP material requirement calculations
  • Turnkey bi-directional sync with QuickBooks Online and Xero
  • Real-time COGS accounting valuation methods (FIFO, AVCO, Standard Costing)
  • Serial number and lot tracking with expiration date management
  • Native Shopify and WooCommerce real-time stock allocation sync

real moats

  • High switching costs from deeply embedded operational and historical inventory data
  • Tight accounting general ledger integration lock-in
  • Battle-tested inventory valuation calculations compliant with accounting standards

open source escape hatches

Fishbowl Inventory

While basic inventory tracking is simple to code, Fishbowl's core value lies in complex manufacturing workflows, LIFO/FIFO costing valuation, and deep two-way sync with QuickBooks. Rebuilding its accounting integrity, warehouse scanner logic, and multi-tier bill-of-materials requires massive domain-specific engineering.

you can rebuild

  • Multi-location stock level tracking
  • Simple purchase order generation
  • Basic barcode label printing and scanning logic
  • Reorder point alerts and safety stock triggers
  • Basic sales order channel consolidation

what you lose

  • Two-way deep synchronization with QuickBooks Desktop and QuickBooks Online
  • Multi-level Bill of Materials (BOM) and assembly work order execution
  • GAAP-compliant FIFO/LIFO/Average costing valuation models
  • Native support for handheld rugged barcode scanner hardware (Zebra, Honeywell)
  • Serial and lot number tracking with expiration date audit trails

real moats

  • Deep bi-directional QuickBooks GL integration with audit-proof accounting integrity
  • High switching costs due to complex BOM mappings and historical COGS data
  • Ecosystem integrations with legacy desktop hardware, shipping carriers, and accounting tools

open source escape hatches

Questions people ask

Which is easier to rebuild with AI, ERPAG or Fishbowl Inventory?

ERPAG. It scores 3/10 on vibe code with a moat of 3/10, so an AI-assisted MVP takes about 3 weeks and a full replacement about 12-18 months, due to complex multi-level BOM explosion algorithms, inventory COGS accounting, and multi-channel sync edge cases..

Which one costs less, ERPAG or Fishbowl Inventory?

ERPAG at $99/mo/mo for a typical mid-market store. The gap between the two is about $4,812/mo a year.

What do I lose if I replace ERPAG?

Multi-level automated MRP material requirement calculations Turnkey bi-directional sync with QuickBooks Online and Xero Real-time COGS accounting valuation methods (FIFO, AVCO, Standard Costing)

What do I lose if I replace Fishbowl Inventory?

Two-way deep synchronization with QuickBooks Desktop and QuickBooks Online Multi-level Bill of Materials (BOM) and assembly work order execution GAAP-compliant FIFO/LIFO/Average costing valuation models

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