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.
App Overview
GridSticker - Sticker Maker
GridSticker turns AI-generated sticker sheets into ready-to-send sticker packs for WhatsApp, Telegram, LINE, and iMessage.
$4.99 · In-app purchases
PRICE
$4.99
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 included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
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
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for GridSticker - Sticker Maker: map the core Graphics & Design 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
Offer advanced editing features like filters, shapes, and stickers library
Assumption to check: Limited customization options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social sharing options for stickers created
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more user-friendly design with guidance
Assumption to check: Clunky user interface for creating stickers
Validate with people who use this workflow before building.
Hypothesis 4
Add a community section for users to share and collaborate on stickers
Assumption to check: Lack of community features
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
GridSticker turns AI-generated sticker sheets into ready-to-send sticker packs for WhatsApp, Telegram, LINE, and iMessage. Drop in any sheet - 2x2, 3x3, 4x4, anything up to 10x10 - and GridSticker slices it into individual stickers automatically. The white backgrounds get removed cleanly. The white sticker outline gets added. Tweak the grid by hand if it gets it wrong. Then ship the pack to WhatsApp or Telegram in one tap, build a LINE Creator ZIP ready for upload, add to iMessage stickers via the share sheet, or save the high-res PNGs to Photos. WHAT REVIEWERS SAY "No more fumbling with different apps to generate stickers, remove backgrounds, cut etc. This app makes it a breeze. Be ready to spam your friends with so many customized stickers they are gonna ask you how you're doing it so quickly." - App Store review "Was surprised how easy it was to turn my images into usable stickers on WhatsApp! It's a lot of fun." - App Store review WHAT'S INSIDE - Grid-slicing for any sticker sheet - any layout, any size, up to 10 rows x 10 columns - Custom sticker tray - browse curated packs, drag the ones you want into your own mix - Automatic background removal using Apple's on-device Vision, your photos never leave your phone - White outline that makes a sticker read as a sticker, with adjustable width - Animated stickers. Drop a multi-frame sheet, line frames up with onion-skin, export as animated WebP for WhatsApp or as a GIF to Photos - Smooth corners via vector contour tracing, no staircase pixels along the edge - Erase brush for stray pixels the auto-cutout missed. Undo if you slip, and the brush sits where your thumb is whether you're lefty or righty - Per-tile fine-tuning when one sticker won't cooperate - Lossless WebP under WhatsApp's 100KB limit, lossy when it has to be - Hi-res Photos export with the transparent background intact WHO IT'S FOR - You generated emoji stickers in any of the popular AIs and want them as a real WhatsApp, Telegram, LINE, or iMessage pack - You scan or photograph drawings and want them clipped, outlined, and shareable - You run a Cricut and need clean white-bordered PNGs for Print-then-Cut projects EXPORT TO - WhatsApp: full sticker pack in one tap, static or animated - Telegram: full sticker pack via Telegram's own importer - LINE Creator: bundled ZIP with the right sticker dimensions, main image, and chat-tray icon, ready to upload at creator.line.me - iMessage: Share, then Add Sticker (iOS 17+) drops the tile into your sticker library - Photos: full PNG, transparent background, no compression - Photos GIF: for animated packs you want to share outside chat apps ONE PURCHASE, NO SUBSCRIPTIONS Pay once, use forever. All features included. No ads, no tracking, no subscription nags. Made on a small island, by one person. gridsticker.peterong.dev
Written user reviews are not shown here. Check current App Store reviews >
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.
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BUILD KIT DIFFICULTY
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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.
