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
BackThen - Baby Book & Albums
The private family journal trusted with 240+ million memories
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
28,665 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for BackThen - Baby Book & Albums: map the core Lifestyle 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
Incorporate advanced tagging and filtering options for memories.
Assumption to check: Difficulties in organizing and searching for specific memories
Validate with people who use this workflow before building.
Hypothesis 2
Add direct sharing to social media platforms and messaging apps.
Assumption to check: Limited sharing options with family and friends
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to choose different themes or layouts for memory presentation.
Assumption to check: Lack of customizable memory themes or layouts
Validate with people who use this workflow before building.
Hypothesis 4
Optimize photo handling and storage to improve performance with large uploads.
Assumption to check: Performance issues with large photo uploads
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
The private family journal trusted with 240+ million memories. From bump to birthdays and beyond — save every photo, video and milestone in one safe place, beautifully organized by child. NEW! Transform your memories into premium Photo Books you can hold forever — created effortlessly from your most-loved moments already in BackThen. Our most requested feature, minus the hassle. WHY FAMILIES CHOOSE BACKTHEN 1. Private & secure — You control who sees what. No ads. No data-sharing. Ever. 2. Effortlessly organized — Photos auto-sorted by child on their own timeline. 3. Full resolution — We never compress your images. Your memories, kept at their best. 4. Timelapse magic — Watch how their face changes over time with our unique technology. 5. Photo Books & prints — Create premium keepsakes from the photos already in your app. 6. The whole family — Grandparents, aunts, uncles — everyone included on any device. DESIGNED FOR EVERY STAGE • Pregnancy Journal — Track bump photos, maternity moments & milestones • Newborn & Baby Book — Document firsts, growth markers & everyday memories • Growing Up — Build a lasting digital family album from year to year SAVE & ORGANIZE • Auto-organize from any device — mobile or desktop • Ordered chronologically from the moment you save — every photo and video in the right place • Photos at full resolution, videos at any length, unlimited milestones including height & weight • Each child gets their own timeline, viewed together or individually • Find any moment with instant scroll or search by date SHARE SECURELY • Invite family and friends — you set their permissions • Everyone gets notified when new memories are added • 100% private — no ads, no data-sharing, no exceptions LOOK BACK & ENJOY • Unique timelapse technology shows how their face changes • Fun sibling and cousin comparisons at the same age • Auto-created highlights, flashback reels and animated stickers PRINT YOUR FAVORITES • NEW: Premium Photo Books — beautifully laid out, printed to the highest quality • Auto-created calendars, montages and prints from your favorite photos • Available in the UK, US, Canada and Europe • Printed locally using your original-resolution photos for the best results TRUSTED BY MILLIONS • From the team behind Lifecake — the original online childhood journal, founded in 2012 • Connecting families across 182 countries • All devices welcome — iOS, email, web & other mobile platforms TRY IT FREE • 1GB free storage to try all features • VIP subscription: £4.99 / $6.49 / €5.99 per month • Nothing to lose — all your content returned if you choose to leave Questions? [email protected] Privacy: https://www.backthen.com/privacy Terms: https://www.backthen.com/terms
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
Advanced
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.
