App Overview

Tally :) icon

Tally :)

Lemonskin · Shopping

Full tutorial video (subtitles available): http://tallyvideo.lemonskin.net

$4.99 · In-app purchases

PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
3.8
5 ratings · Top 50%

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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Combine features and design from your favorite apps.

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What's included17 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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Free quick prompt For a smaller starting point

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 Tally :): map the core Shopping 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

Enhance search with filters and tags for easier navigation

Assumption to check: Limited item categorization and search functionality

Validate with people who use this workflow before building.

Hypothesis 2

Implement better user profile and subscription management

Assumption to check: Inadequate account management features

Validate with people who use this workflow before building.

Hypothesis 3

Add in-app support chat for immediate assistance

Assumption to check: Poor customer support responsiveness

Validate with people who use this workflow before building.

Hypothesis 4

Enable cloud sync for users' shopping lists across devices

Assumption to check: Lack of synchronization across devices

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

Full tutorial video (subtitles available): http://tallyvideo.lemonskin.net Tally is an application designed to facilitate your shopping. Create a list of products (either manually or by capturing the barcode) and check for errors on the supermarket receipt. It's a fact: when you have to go to the supermarket you need to fill a shopping list. How many times have you tried to keep everything in mind just to realize, upon returning home, you had forgotten a key ingredient for dinner or the cake of next day? Post-its, however, are pretty boring and, without a pen in hand (for example, when you're already going around the shelves), they can't be upgraded in a convenient and practical way. Our smartphone is always with us, then why not use it to make our life easier? Here at Lemonskin we like to go further. Why limit the app to a simple shopping list when it's possible to add tools that can automate the whole shopping process and may help you to verify the correctness of the receipt? There's no need to write all the time "bread, flour, milk, eggs, ..." when we have a camera in our pocket! With Tally creating a list is as simple as frame the finished product barcode (at home) or a new one (in the supermarket). You will need to enter the product name only the first time, from then on the application will learn to associate the correct code to the specific product. No problem if you buy a different brand of yogurt. Tally is capable to associate multiple codes to the same article. One of the most useful features of Tally is the ability to quickly check for errors on the receipt. It's happened to us all to pay a higher-than-expected total and, once at home, realize that a product, advertised as discounted, was instead charged full price. There are mistakes that occur more often than you think, and maybe some supermarket plays a bit around it. Tally has a specific section dedicated to the receipt verification. So you can, in seconds, find the inconsistency and show it to the cashier in order to be immediately reimbursed (or enjoy in case the error occurred is to your advantage). We purposely designed the interface of Tally to be simple and intuitive, but we have included powerful features that simplify your decisions during shopping. If you are not sure you want to buy a particular product but you don't want to take the risk to forget about it, you can have it in the list but disabled. That way it will always be at your fingertips and you can check how much it affects the final cost. Products database is always accessible via a special section and can be easily modified, extended or simplified. This will give you full control over your saved items. Tally, your definitive shopping assistant! :)

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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
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BUILD KIT DIFFICULTY
Starter

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.