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.
In the middle of the rush for applying Artificial Intelligence (AI) and Machine Learning to training apps, Happy Fingers wants you, rather than the machine, to be the one that actually learns something.
$9.99 · 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 Happy Fingers by Eva Lopez: map the core Sports workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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: Limited variety of exercises.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Inconsistent user interface design.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of community features.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No feedback mechanism for exercises.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
In the middle of the rush for applying Artificial Intelligence (AI) and Machine Learning to training apps, Happy Fingers wants you, rather than the machine, to be the one that actually learns something. Happy Fingers has the following goals: • Answering all of your questions related to finger training for climbing; • Carefully guiding you in the process of choosing some training method or grip type; • Describing how to warm up; how to hang or how to perform each program; • Teaching you how to control the load to ensure the desired effects; • Offering alternatives to keep from stalling; • Preventing injuries, overtraining and excessive fatigue in your forearms; • Describing different training methods and the optimal exercise for each circumstance; • Providing a range of training programs for each method, level and athletic goal to choose from. I’m Eva López; climbing is my passion and the topic of my doctoral thesis on Finger Endurance and Strength Training in Climbing. I developed Happy Fingers with the aim of making you the main character in your growth process, looking at the reasons behind any hitch you find while training, offering strategies to keep your motivation or progressing in the long run. Of course, your personal situation, objectives and needs will always be part of the equation. All of the above is based on the most up to date research and what I’ve learned along my 20+ years of observation, analysis and experimentation. I have adapted all that knowledge to the individual characteristics of every person I’ve trained, including myself, to refine and complete the process. Linking Science & Experience, relating Theory & Practice, Evidence-based Training, all describe this educational resource that will help you get the most out of your workouts and your climbs. I want to make clear that the Happy Fingers app does not automatically churn out training programs from some initial evaluation. It's full of information and advice, but it will never command you to blindly follow some path. Individualization is a staple of training, the Holy Grail. You decide. You’re on the driver’s seat. CONTENTS: 1. Before You Hang. 11. Are dead hangs for me? 1.2. Terminology. 1.3. What gear do I need 2. The Basic Dilemmas 2.1. Strength or Muscular Endurance? 2.2. Which Method do I Choose? 2.3. Which Grip Type to Use? 3. Training Methods 3.1. Maximal Head Hangs. 3.2. Submaximal Dead Hangs. 3.3. Intermittent Dead Hangs. 4. The Finger Meets the Edge 4.1.Dead Hangs Technique. 4.2.Warming Up. 4.3. Control of the Load. Self-regulation. 5. Periodization 5.1. The Dead Hangs Session. 5.2. The Training Week. 5.3. Proposed Training Plans. 5.4. Improving in the Long-Term. 5.5. Monitoring and Directing your Training. 6. The Road to Perseverance 6.1. Staying Motivated. 6.2. Reducing the Risk of Injury. Future updates will bring even more contents, mainly in Methods, Programs and Physiological Adaptations. Strong Fingers are Happy Fingers Fingers with an Evidence-Based Approach are Happy Fingers Well-coached fingers, Happy Fingers
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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.