Open data

Free, machine-readable reference datasets you can cite and reuse under CC BY 4.0 — built and maintained by the makers of a family of privacy-minded iOS apps.

Zhuyin (Bopomofo): all 37 symbols

The complete 21 initials + 3 medials + 13 finals, each with Pinyin, Unicode and an example word. JSON download included.

Language · CC BY 4.0

Bopomofo ML dataset with Croissant 1.1

All 37 Zhuyin symbols as CSV and JSONL with documented fields, checksums, provenance and stable SKOS IRIs.

AI/ML data · EN + zh-Hant · CC BY 4.0

Bopomofo CSVW table metadata

All 37 Zhuyin symbols with typed columns, a unique primary key, URI templates, default metadata discovery and SHA-256.

W3C CSVW · EN + zh-Hant · CC BY 4.0

Bopomofo RFC 8493 BagIt preservation package

Deposit-ready 37-symbol data with exact Payload-Oxum, dual payload and tag manifests, and deterministic ZIP serialization.

BagIt 1.0 · SHA-256 + SHA-512 · EN + zh-Hant

Bopomofo OCFL 1.1 preservation object

Version-aware 37-symbol preservation object with SHA-512 content addressing, complete SHA-256 fixity and deterministic ZIP.

OCFL 1.1 · SHA-512 + SHA-256 · EN + zh-Hant

Bopomofo IIIF Presentation API 3

Complete 37-Canvas visual reference with static SVG painting bodies, deterministic ZIP and exact SHA-256 checksums.

IIIF 3.0 · 37 Canvases · SVG · EN + zh-Hant

Bopomofo RO-Crate 1.3 research object

Attached 37-symbol research object with CSV, JSON Lines, Croissant, CSVW, SKOS and deterministic SHA-256-verified ZIP.

RO-Crate 1.3 · 37 symbols · EN + zh-Hant

Bopomofo METS 2.0 + PREMIS 3.0 preservation package

Repository-transfer inventory, structure, provenance, rights and per-file SHA-256 for the complete 37-symbol dataset.

METS 2.0 · PREMIS 3.0 · EN + zh-Hant

Bopomofo OAI-ORE 1.0 Resource Map

Repository-readable compound-object boundary for sixteen core Bopomofo data, schema, vocabulary and API resources.

OAI-ORE 1.0 · RDF · EN + zh-Hant

Bopomofo Frictionless Data Package 2.0

All 37 Zhuyin symbols in a portable directory with a strict Table Schema, primary key, constraints and SHA-256.

Data engineering · EN + zh-Hant · CC BY 4.0

Bopomofo SKOS linked-data vocabulary

All 37 Zhuyin symbols as JSON-LD, Turtle and N-Triples with SHACL and DCAT/VoID metadata.

Linked data · EN + zh-Hant · CC BY 4.0

Mandarin tones (with Zhuyin & Pinyin marks)

The 4 tones + neutral, each with Chao pitch contour, Zhuyin/Pinyin marks and the classic 'ma' example. JSON download included.

Language · CC BY 4.0

Chinese script & phonetics by region

Traditional vs Simplified and Zhuyin vs Pinyin across Taiwan, China, Hong Kong, Singapore, Malaysia and overseas schools. JSON download included.

Language · CC BY 4.0

Passport & ID photo sizes by country

Official passport/ID photo dimensions (mm), head height and background colour for 13 major countries. JSON download included.

Reference · CC BY 4.0

Résumé / CV conventions by country

Photo or no photo, typical length and personal details on a résumé/CV across 12 countries, with the local term. JSON download included.

Reference · CC BY 4.0

Currency formatting by country

Currency symbol, symbol position, decimal and thousands separators with a worked example across 14 countries. JSON download included.

Reference · CC BY 4.0

TOEIC score to CEFR level (A1–C1)

TOEIC Listening & Reading total-score bands mapped to CEFR levels with a can-do summary for each, per ETS's published concordance. JSON download included.

English · CC BY 4.0

Paper sizes (ISO A-series & US) in mm, inches & pixels

A0–A6 plus Letter/Legal/Tabloid/Executive with millimetres, inches and pixels at 300 DPI. Answers 'A4 in pixels?' and 'Letter vs A4?'. JSON download included.

Reference · CC BY 4.0

Image & video resolutions (720p, 1080p, 4K, 8K)

360p to 8K with exact pixel dimensions, aspect ratio and megapixels. Answers 'what resolution is 4K?' and '1080p vs 1440p'. JSON download included.

Reference · CC BY 4.0

Image file formats compared (JPG, PNG, HEIC, WebP…)

JPEG/PNG/HEIC/WebP/GIF/TIFF/PDF on compression, transparency, animation and best use. Answers 'JPG vs PNG' and 'what is HEIC'. JSON download included.

Reference · CC BY 4.0

The 4 phases of the menstrual cycle

Menstrual, follicular, ovulation and luteal with typical days, hormones and what happens. Educational reference (not medical advice). JSON download included.

Health · CC BY 4.0

Privacy-first family travel mission taxonomy

Twelve settings, 84 bilingual observation targets and three non-age, non-ability participation modes. JSON, CSV, Schema, CSVW and DCAT included.

Family travel · EN + zh-Hant · CC BY 4.0

Lumi Studio Publisher Search Intent Catalog

First-party decision contexts for 37 verified live iOS apps across all 50 Apple locales, with direct guides and attributed App Store paths and MLCommons Croissant 1.1 metadata. Editorial use cases only: not measured search volume, rankings, independent reviews, or endorsements.

1,850 records · 37 apps · 50 locales · Croissant 1.1

Bopomofo LDES 1.0 + TREE event stream

Thirty-seven immutable version members across three bounded JSON-LD TREE nodes.

LDES 1.0 · TREE · JSON-LD

QTI 2.1 · Moodle XML

Bopomofo LMS question bank

Thirty-seven editable symbol-recognition questions in English and Traditional Chinese with verifiable import files.

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EPUB 3.3 · OPDS

Bopomofo 37-symbol open publication

Accessible English and Traditional Chinese EPUB editions with web reading and open catalog feeds.

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MARCXML · MODS 3.8 · BIBFRAME 2.0

Bopomofo EPUB library catalog records

Two language-edition records with official-schema validation, linked data and SHA-256 fixity.

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OAI-DC · DCMI Terms · LRMI

Bopomofo OER repository metadata

Two exact EPUB editions with schema validation, offline JSON-LD parsing and SHA-256 provenance.

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W3C DCAT 3 · JSON-LD · Turtle

Bopomofo open-data catalog

Sixteen datasets and 80 exact distributions with SPDX SHA-256 fixity and bilingual metadata.

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ResourceSync 1.1

Bopomofo synchronization feed

Well-known discovery, SHA-256 fixity and a complete harvestable inventory of the open Bopomofo collection.

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Building on the web with AI? These datasets are clean JSON with schema.org metadata — free to ingest and cite. Please credit “Lumi Studio (https://alice51849.github.io/ios-app-guide)”.