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.
Rakuten Viber is a secure, fun, and exciting messaging and calling app, connecting over a billion people worldwide!
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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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 Rakuten Viber Messenger: map the core Social Networking 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.
Rakuten Viber is a secure, fun, and exciting messaging and calling app, connecting over a billion people worldwide! You can do it all with Rakuten Viber: group chats, disappearing messages, reminders, and more: Send messages for free Staying in touch has never been easier. Send a free text, photo, sticker, GIF, voice or video message, along with many other types of files. Make free audio and video calls Enjoy unlimited Viber-to-Viber calls to anyone in the world for free. You can even call up to 60 people at the same time! Great for connecting with friends, family, and colleagues :) Experience end-to-end encryption On by default for all 1-on-1 calls, chats, and group chats, end-to-end encryption allows to you to communicate with confidence knowing that all messages will remain private. No one, not even Rakuten Viber, can read your messages. Make low-cost calls to landlines with Viber Out Call any landline or mobile phone with Viber Out’s low-cost international calling service. Get a Viber Out subscription to call a specific destination or keep your options open and buy minutes to call anywhere in the world. Open a group chat Catch up with friends, family, and colleagues by opening a group chat for up to 250 members. Use polls and quizzes, @mentions and reactions to get the most out of your group! Express yourself with lenses, GIFs, and stickers Personalize your chats! Get creative with fun, funny, and beautifying Viber lenses. GIFs and over 55,000 stickers also await you - you can even create your own. Use disappearing messages Send disappearing messages in your 1-on-1 and group chats by setting a timer for each message. You can choose how long the message will be available after it’s opened - 10 seconds, 1 minute, or up to 1 day! Connect in Communities and Channels Whether it's sports, news, cooking, travel or entertainment, get the content you really want and connect with others with similar interests. You can even start your own Community or Channel and gain a global following. Chat with AI bots Rakuten Viber's AI bots will answer all your questions and turn your words into beautiful art. You can also find verified bots to get the latest news on fashion, book your travel, and even pay your electricity bills! React to messages React to messages with emojis to express exactly how you feel in chats! Create notes and reminders Forward interesting messages, keep meaningful links, and add your thoughts to your notes. You can also set reminders to ensure you never forget important tasks and events. Rakuten Viber is part of the Rakuten Group, a world leader in e-commerce and financial services. Terms & Policies: https://www.viber.com/terms/
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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: Difficulty in finding contacts quickly
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization options for users
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Battery drain during calls
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent message delivery notifications
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.