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
Sendbook: Climbing Logbook
Sendbook is the premium, offline-first climbing and bouldering logbook built entirely for the gym
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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 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.
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 Sendbook: Climbing Logbook: map the core Health & Fitness 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 social features like sharing logs, public routes, and challenges.
Assumption to check: Lack of community features for sharing logs and routes
Validate with people who use this workflow before building.
Hypothesis 2
Enhance progress charts with more detailed analytics and breakdowns.
Assumption to check: Limited data visualization for progress tracking
Validate with people who use this workflow before building.
Hypothesis 3
Integrate with APIs for climbing route databases and outdoor climbing information.
Assumption to check: No integration with external climbing databases
Validate with people who use this workflow before building.
Hypothesis 4
Create a guided onboarding experience to help users understand app features.
Assumption to check: Inadequate onboarding for new users
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
Sendbook is the premium, offline-first climbing and bouldering logbook built entirely for the gym. No subscriptions, no ads, and no internet connection required. Designed to be incredibly fast, Sendbook lets you log your ascents in seconds so you can get right back on the wall. Whether you are projecting V10s, chasing a new Grade Milestone, or just trying to build a consistent workout habit, Sendbook turns your climbing data into beautiful, actionable insights. LOG ASCENTS IN SECONDS • Track Bouldering, Top Rope, and Lead climbing seamlessly. • Log attempts, flashes, and redpoints with a single tap. • Save your beta: Tag route features (Crimps, Slopers, Overhangs, Dynos) and attach photos or videos directly to your ascent. STAY ON THE WALL • Built-in Rest Timer: Track your rest periods directly from your Lock Screen or the Dynamic Island with Live Activities. POWERFUL ANALYTICS • Visualize your progression with a 16-week Activity Heatmap and 30-day Grade Pyramid. • Track your all-time max grades and average session intensity with beautifully smoothed progression charts. ACHIEVEMENTS & MILESTONES • Unlock dozens of gamified achievements spanning Grade Milestones, Mastery, and Consistency. Discover hidden "Mystery" achievements as you push your limits. OWN YOUR DATA • 100% Offline-first. Lightning-fast logging even in concrete warehouse gyms with zero cell service. • Export and import your entire logbook via CSV. Your data belongs to you. • Switch instantly between 4 regional grading systems (V-Scale/YDS, Font/French, Font/UIAA, Kyū/Dan). MAKE IT YOURS • Customize the app with 10 vibrant accent color themes designed to pop against a true OLED-optimized dark mode.
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.
SUGGESTED BUILD STACK
React Native
Expo
TypeScript
Redux
react-native-chart-kit
@react-navigation/native
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.
