App Overview

Dictionary of Japanese Names icon

Dictionary of Japanese Names

CJKI · Reference

CJKI's Japanese Names Dictionary is a based on the CJK Dictionary Institute's comprehensive collections of millions of Japanese names and their variants -- the largest such repository in existence.

$3.99 · In-app purchases

PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
3.0
3 ratings · Below Average

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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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.

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.

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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Dictionary of Japanese Names: map the core Reference 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 advanced filters for name categories and meanings.

Assumption to check: Limited search functionality

Validate with people who use this workflow before building.

Hypothesis 2

Add user accounts for saving favorites and search history.

Assumption to check: Lack of user personalization

Validate with people who use this workflow before building.

Hypothesis 3

Create a modern design with better usability and aesthetics.

Assumption to check: Outdated UI design

Validate with people who use this workflow before building.

Hypothesis 4

Incorporate a community-driven feature for users to suggest names.

Assumption to check: Limited content updates

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

CJKI's Japanese Names Dictionary is a based on the CJK Dictionary Institute's comprehensive collections of millions of Japanese names and their variants -- the largest such repository in existence. Japanese names have been called the "Eighth Wonder of the World". Indeed, even native speakers often have difficulties in determining the correct pronunciation for a name written in kanji, or guessing the kanji for a name written in Latin characters. In extreme cases, one kanji name can be pronounced 36 ways, whereas one romanized name can be written in more than 100 ways. Q: Do you know how to read the name 一二三 and 海? A: Kirara and Marin. Q: Do you know to write in kanji the surname Hashizume? A: Here some possibilities: 橋詰, 橋爪, 橋都 and 橋誥. Q: Do you know how many different ways there are of writing Akiko? A: At least 168! Here are just a few: 明子, 晶子, 昭子, 彰子, 亜喜子, 亜希子, 安貴子 and many more. CJKI's Japanese Names Dictionary is a based on the CJK Dictionary Institute's comprehensive collections of millions of Japanese names and their variants -- the largest such repository in existence. The subset provided here consists of the most common 500,000 Japanese surnames and given names, accompanied by their hiragana readings, and over 800,000 of the most popular romanized variants, as well as frequency of use statistics. Distinctive Features --------------------------------- * Comprehensive coverage approx. 500,000 core names with over 800,000 romanized variants selected on the basis of frequency statistics. * Over 1.5 million indexed romanized names, allowing for a variety of romanized forms, including relatively rare ones. * Radical index with all radical variants for quick access for names of unknown pronunciation. * Enables finding the kanji version corresponding to any of the numerous romanized variants. For example, Jun'ichirō, which can be written in kanji in at least 87 ways such as 純一郎, 潤一朗 and 凖市郎, and has at least 168 romanized variants such as Jun'ichiro, Junichiroo, Junichirou, Junichiroh, and Zyun'itirô. * Bilingual bidrectional: English-Japanese and Japanese-English bundled in one application. * Designed for easy use by both Japanese and non-Japanese users alike. * User interface of superb design ensures maximum ease of use. * Bilingual interface: user interface in Japanese and English. * No Internet connection required. * History and Bookmarks ABOUT CJKI The CJK Dictionary Institute is directed by Jack Halpern, editor of the New Japanese-English Character Dictionary and The Kodansha Kanji Learner's Dictionary, now standard reference works. Be sure to check out our other dictionary apps available for the iPhone (search for "cjki").

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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
React Navigation
Zustand
Supabase
BUILD KIT DIFFICULTY
Intermediate

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.