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.
Buy and sell new or used airsoft gear on the largest airsoft-only marketplace
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for HopUp - Airsoft Marketplace: 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Buy and sell new or used airsoft gear on the largest airsoft-only marketplace. HopUp is the best way to buy, sell, and explore the airsoft community, with Purchase Protection included free on everything you buy through HopUp Payments. FOR BUYERS PURCHASE PROTECTION GUARANTEE Receive your item as described or your money back. It is included free on every item you buy through HopUp Payments, and the seller is not paid until 3 days after delivery or you write a review, whichever comes first. FIND THE GEAR YOU WANT Search new and used gear from players across the country. Filter by distance and condition, sort by price, browse by category, and switch between used listings and brand-new retail items. Favorite items to keep an eye on them and set keyword alerts so you know the moment what you want gets listed. BUY NOW, MAKE AN OFFER, OR BID Check out in seconds with a card or Apple Pay. Make an offer on most items and the seller can accept it right in your messages, or bid in live auctions. KNOW YOUR SELLER Every seller profile shows their star rating, reviews, vouchers from other players, and how long they have been on HopUp. FOR SELLERS LIST FOR FREE, PAY ONLY WHEN IT SELLS Add up to 10 photos and a short demo video, set your price, and publish in minutes. There is no listing fee. A selling fee applies only when your item sells. Alternatively, pay a small fee upfront for the listing and accept payment outside of HopUp on your own terms. LISTING COACH Get live tips while you write your listing: what to include, what buyers look for, and data-backed nudges like adding more photos so your item sells faster. OFFERS THAT WORK FOR YOU Accept offers of 50% or more of your asking price, and let HopUp automatically send a discount to buyers who favorited your item if it has not sold yet. DISCOUNTED, INSURED SHIPPING LABELS Buy a USPS, UPS, or FedEx label right from the sale at heavily discounted rates, insured for the full value of your item, with tracking added automatically. Prefer your own label? Add the tracking number or snap a photo of your receipt. SELLER PROTECTION AND FAST PAYOUTS You are protected from chargebacks and fraudulent buyers. Payouts are sent 3 days after delivery or as soon as the buyer leaves a review, and instant transfers are available. SELLER TOOLS Track how your listings perform with seller analytics, list multiple quantities of the same item, share your seller profile, and build your reputation with ratings & reviews. PRIVACY - BUILT IN MESSAGING Built-in messaging with photos and video, so there is no need to share personal contact info to discuss a deal. A SAFER PLACE TO TRADE GEAR Listings are reviewed by our team, every in-app report goes straight to us, and our support team is a message away, typically replying within 24 hours. WE WANT YOUR FEEDBACK Feedback is what drives us to improve HopUp. To suggest a feature or report a bug, use Send Feedback under Settings or email us at [email protected]. *HopUp is for airsoft only and we do not tolerate the sale of firearms, ammunition, knives or ballistic-rated body armor. HOPUP PREMIUM HopUp Premium is only $9.99/month: priority listing bumps, instant approval for your listings, and more. Try HopUp Premium free for 1 month as an introductory offer. HopUp uses AI to assist with the Listing Coach, Reviewing items listed for sale and more. Terms of service: hopupairsoft.com/terms Subscription Details • Payment will be charged to iTunes Account at confirmation of purchase • Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period • Account will be charged for renewal within 24-hours prior to the end of the current period, and identify the cost of the renewal • Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's Account Settings after purchase
Written user reviews are not shown here. Check current App Store reviews >
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
Assumption to check: Limited product filtering options
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent user review quality
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Slow loading times for product images
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited payment options
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.