App Overview

Spool Shelf icon

Spool Shelf

Daniel De Ciantis · Productivity

Spool Shelf is a hobbyist’s ultimate 3D printing filament inventory management tool

$6.99 · In-app purchases

PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

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Build Kit

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A product spec, screen plans, and build steps for your coding agent.

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What's included14 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Spool Shelf: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

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Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Implement better tagging and filtering options.

Assumption to check: Users find it difficult to organize tasks effectively.

Validate with people who use this workflow before building.

Hypothesis 2

Add functionality for setting up recurring tasks easily.

Assumption to check: Limited options for recurring tasks.

Validate with people who use this workflow before building.

Hypothesis 3

Integrate a calendar view for better scheduling.

Assumption to check: Lack of visual calendar integration.

Validate with people who use this workflow before building.

Hypothesis 4

Introduce shared tasks and project collaboration.

Assumption to check: No collaborative features for team projects.

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

Spool Shelf is a hobbyist’s ultimate 3D printing filament inventory management tool. Track inventory, orders, historical data, and more — all with just a tap! Spool Shelf makes the task of keeping inventory records up to date an absolute breeze! All of the most important information regarding your filament can be stored within Spool Shelf and is made easily accessible, so you can quickly find the exact filament you’re looking for — both in the app and in your workshop. Here are some of Spool Shelf’s key features: DASHBOARD • Get quick stats on the number of filaments in stock, out of stock, running low, and more. • View your total on-hand inventory value. • View inventory history ranging from the last 7 days to all time. • Product breakdown by material and manufacturer. • Get the total number of products, on-hand units, received orders, and more. INVENTORY • Track filament by the spool. • Assign a bin # to quickly locate a filament spool in your workshop. • Assign material and manufacturer to each filament for easier sorting. • Assign barcode and SKU. • View inventory history, including adjustment history per item. • Sort inventory by in stock, low stock, no stock, and more. ORDERS • Bulk-receive inventory items quickly and easily. • Assign supplier, shipping courier, tracking number, and order number for easier sorting. • Quickly duplicate an order for frequently purchased filaments. • Sort orders by pending, partially received, fully received, and cancelled. MORE • Powerful search allows you to quickly locate inventory items and orders by combining multiple queries into a single search. • Choose to be reminded when orders are expected to arrive, as well as when they are past due. • Sync inventory data automatically with iCloud, so it is accessible on multiple devices. FROM THE DEVELOPER Hey there! I designed Spool Shelf to make filament inventory management fun and intuitive, so 3D printing hobbyists (like me!) can easily manage their ever-growing filament stockpile. As a 3D printing hobbyist myself, I took great care when building Spool Shelf so that it works exactly as a hobbyist would expect. I am incredibly proud to share Spool Shelf with you, and I truly hope you enjoy using it as much as I enjoyed building it. If you love Spool Shelf, I’d love to hear about it! If you find a bug, have a feature request, or if something else is on your mind, I’d love to hear about that too! My goal is to make Spool Shelf the best it can be, and feedback like yours makes all the difference. You can reach out to me at [email protected] Happy printing!

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Screenshots

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Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
React Navigation
TypeScript
BUILD KIT DIFFICULTY
Intermediate

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.