ecomrestack

battles / ERP & Inventory

Erply vs Fishbowl Inventory

Erply ($450/mo/mo, vibe code 3/10) vs Fishbowl Inventory ($500/mo/mo, vibe code 3/10). Fishbowl Inventory is the easier one to rebuild yourself — here is what you lose either way.

Erply
KEEP

ERP & Inventory

$450/mo/mo

Vibe code3/10
Moat4/10
MVP
2 months
Full replacement
12-24 months, due to hardware device drivers, offline sync queues, and multi-location accounting edge cases.
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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.

easier to rebuild

get the build prompt →

price gap / year

$600/mo

running both / year

$11,400/mo

our call

Start with Fishbowl Inventory — highest vibe code, weakest moat.

Erply

Erply controls the operational plumbing of retail: physical receipt printers, payment terminal bridges, offline sync queues, and matrix item variants. Building a basic web inventory list with AI is easy, but maintaining network-resilient register hardware integrations and complex FIFO inventory ledgers across physical locations is not feasible with prompt-generated software.

you can rebuild

  • Product catalog management and matrix variant definitions
  • Customer records and simple loyalty points tracking
  • Basic manual stock adjustments and intra-warehouse transfer orders
  • Web-based register UI for touch-screen product selection
  • Standard sales dashboard reporting and inventory valuation metrics

what you lose

  • Native local hardware wrappers for receipt printers, cash drawers, and barcode scanners
  • Offline-first POS register state engine using local browser storage and sync queues
  • EMV credit card reader direct integrations (Ingenico, Verifone, PAX)
  • Fiscal memory cash register compliance modules for strict European tax jurisdictions
  • Automated purchase order generation based on historic reorder points

real moats

  • Hardware integration layer abstracting physical payment terminals and peripherals
  • Operational switching costs associated with retraining retail floor staff across multiple locations
  • Localized retail fiscal tax compliance and audit-trail engines

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, Erply or Fishbowl Inventory?

Fishbowl Inventory. It scores 3/10 on vibe code with a moat of 4/10, so an AI-assisted MVP takes about 3-4 weeks and a full replacement about 12-24 months, due to complex bill of materials (BOM), accounting sync, barcode hardware integration, and multi-location valuation models..

Which one costs less, Erply or Fishbowl Inventory?

Erply at $450/mo/mo for a typical mid-market store. The gap between the two is about $600/mo a year.

What do I lose if I replace Erply?

Native local hardware wrappers for receipt printers, cash drawers, and barcode scanners Offline-first POS register state engine using local browser storage and sync queues EMV credit card reader direct integrations (Ingenico, Verifone, PAX)

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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