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.
Some notes are worth a folder and a title
$0.99
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.
Your first Build Kit is free with a verified email.
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 JKST Note: map the core Productivity 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.
Some notes are worth a folder and a title. Most are not. JKST Note is for the other kind — the thought, the todo, the expense, the password you just made up — captured in seconds and then left alone. Tap the plus, pick a type, type, save. No folder to choose, no title to invent, no screen to navigate afterwards. The loop is capture and done. CAPTURE WITHOUT A DETOUR Start a new note from Control Center, the Lock Screen, or the Action button. Or say "Jot this in JKST Note" to Siri; five spoken shortcuts open the same capture form. Use the share sheet to send a webpage, selected text, or image into JKST Note. Attach a photo from your library or take one with the camera, or record audio for an on-device transcript. NOTES WITH A SHAPE A note here is a small typed card rather than a blank page. Seven types come built in — Jot, Todo, Log, Account, Expense, Contact, Link — each with its own fields, and you can invent your own on the phone: add a field, choose its kind, mark it required, prefilled, or secret. Editing a type never rewrites the notes you already captured. SECRETS THAT STAY SECRET Mark a field secret and its value is encrypted on your iPhone, shown as dots, and left out of search. Revealing it or copying it takes a fresh Face ID check every single time, however recently you unlocked the app. A revealed value re-hides after ten seconds. A copied one clears itself from the clipboard, and never travels to your Mac or iPad. Write down the six-word recovery code and a lost phone does not mean lost secrets. Skip it and your secrets live and die on this iPhone. The app tells you that plainly instead of burying it. NOTHING LEAVES YOUR PHONE No account. No server. No analytics. JKST Note makes no network requests at all, so there is nowhere for your notes to go. The whole app sits behind Face ID, and the app switcher shows a cover instead of your notes. FIND IT LATER One reverse-chronological stream, filter chips per type, and full-text search across everything you captured — except your secret values, which are never indexed. Deleted notes wait thirty days in Recently Deleted before they go. THE NAME Jot, Keep, Search, Trust. Also Jot, Keep, Secure, Type. Between them they name the five things this app is about, which is more than four letters usually manage. And, simply: Just keep stuff together. Requires iOS 18. iPhone only.
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 organization features for notes
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No cloud sync options
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface feels basic
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of reminders for notes
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.
Not assessed in a Build Kit yet.
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.