# Fulin Labs

> Fulin Labs is Giovanni Fu Lin's independent software studio for language learning, link management, and creator publishing tools.

## Projects
- [Fulin Flashcard](https://fulinlabs.com/projects/flashcard/): lightweight offline browser spaced repetition for custom language vocabulary — app at https://flashcard.fulinlabs.com
- [HSK Studio by Fulin Labs](https://fulinlabs.com/projects/hsk-studio/): paste Chinese text, look up words in place, save vocabulary, and review it with spaced repetition — app at https://hsk.fulinlabs.com
- [ShortLink by Fulin Labs](https://fulinlabs.com/projects/shortlink/): hosted URL shortener for approved accounts with destination checks, analytics, custom aliases, QR codes, folders, and an API — app at https://s.fulinlabs.com
- [SchedulePost by Fulin Labs](https://fulinlabs.com/projects/schedulepost/): upload short-form video once and schedule it to implemented social publishing integrations — app at https://schedulepost.fulinlabs.com

## Tools
- [Chinese text analyzer](https://fulinlabs.com/tools/chinese-text-analyzer/): paste Chinese text for character counts, HSK 1-6 character coverage, the characters above that level, and reading time; computed in the browser from the official HSK 2012 word lists
- [Flashcard workload calculator](https://fulinlabs.com/tools/flashcard-workload-calculator/): estimates the steady-state reviews per day, ramp-up, and minutes per day a spaced repetition new-card rate settles at, with the interval model stated on the page
- [All tools](https://fulinlabs.com/tools/): browser-based tools on this site plus the tools hosted on the product sites

## Docs
- [About](https://fulinlabs.com/about/): who Fulin Labs is
- [Facts](https://fulinlabs.com/facts/): canonical studio, founder, product, and corrections information
- [Chinese reader comparison](https://fulinlabs.com/compare/paste-chinese-text-readers/): dated, source-backed comparison and methodology
- [Fulin Flashcard specification](https://fulinlabs.com/projects/flashcard/specification/): scheduling, storage, offline, and backup behavior
- [SchedulePost platform support](https://fulinlabs.com/projects/schedulepost/platform-support/): maintained implementation and verification matrix
- [All projects](https://fulinlabs.com/projects/): full project lineup
- [Blog](https://fulinlabs.com/blog/): build notes and write-ups on each project (English only)

## Topics
The blog grouped by subject. Each hub states what its cluster covers and lists every post on it.
- [All topics](https://fulinlabs.com/topics/): the seven clusters and their sizes
- [Reading Chinese](https://fulinlabs.com/topics/reading-chinese/): how many characters reading takes, judging whether a text is at your level, and keeping a daily habit
- [HSK levels and vocabulary](https://fulinlabs.com/topics/hsk-levels/): what each HSK level contains and how to use the syllabus as a reading yardstick
- [Spaced repetition and flashcards](https://fulinlabs.com/topics/spaced-repetition/): scheduling, the review workload a new-card rate settles at, and what makes a card answerable
- [Chinese learning app comparisons](https://fulinlabs.com/topics/chinese-app-comparisons/): Pleco, Anki, Duolingo, Du Chinese and others, compared by the job each is built for
- [Scheduling short-form video](https://fulinlabs.com/topics/scheduling-short-video/): per-platform rules for TikTok, Reels, and Shorts, and where "scheduled" means a reminder rather than a publish
- [Short links and click analytics](https://fulinlabs.com/topics/short-links/): what click data can and cannot tell you, UTM survival, QR codes, and link reputation
- [Build notes](https://fulinlabs.com/topics/build-notes/): how these products and this site are made, including the mistakes

## Languages
The home, projects, and about pages are also available in Spanish, Portuguese, German, and
French under /es/, /pt/, /de/, /fr/ (e.g. https://fulinlabs.com/es/projects/flashcard/).