Independent tools by the same creator, Yi Builds, for different parts of learning.
ReadTrace is an English reading practice tool: connect an answer to evidence in the passage, review a misreading, and try a new question.
The authored sample is available without an account. Photo import supports text recognition, correction and saving when configured; automatic teaching for arbitrary photos is not yet available.
EssayStep is an English essay writing coach for multilingual learners: plan your ideas, write your own draft, and revise with evidence-linked feedback.
Planning and writing work without login. AI feedback requires login and configured services. Feedback is formative, not an official IELTS, TOEFL or GRE score.
Own Words is a workplace English practice prototype: start with something you could not say, try a response, remove hints, and check it in a different situation.
The web demo supports typed practice and fictional example records. Live AI assessment and speech recognition are not connected. The Android app is in development.
Video Sensei is a video learning workspace that turns supported YouTube transcripts into time-aligned bilingual reading, contextual explanations, saved notes and practice.
Import and AI tools require an account and available provider services. Transcript availability varies by video. A translated explanation should be checked against the original segment.
AI English Shift combines AI concepts with English practice through authored readings, bilingual support, knowledge connections, dictation and transfer writing.
Learning materials can be explored without login. The contextual AI tutor requires a configured account. Support varies by lesson; an introductory page does not imply every course is available in that language.
Fusen is an everyday English note app currently being updated. No public download is offered here.
Understand a passage in ReadTrace or a video in Video Sensei. Explain it yourself, revise an argument in EssayStep, and practise a workplace response in Own Words. Explore technical concepts in AI English Shift. Each product maintains its own learning records; these links do not transfer your data.