01
Onyx音频播放器
Listen closely. Compare honestly.
Compare mixes at the same playhead, match loudness, and check what you hear with meters and blind ABX tests.
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Version 1.0.0 · macOS / Windows
Four girls · audio & music production · good stuff
OH SISTERS油头姐妹
We build the tools nobody made for us.
Read your message, replied with nonsense. Mental state: excellent. We really do have jobs. Show some respect — these are four client-daddies. We will be together forever, like sparrows on the same power line.
The tools
Seven desktop apps · built by us02
Flint格式转换
Drop files. Get the format you need.
Convert video, audio, images and documents locally, with crop, batch processing and MIDI rendering.
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Version 1.0.0 · macOS / Windows
03
JustPiano托盘钢琴
A piano, whenever an idea arrives.
Play with a MIDI keyboard or computer keys, then save your ideas as MIDI or WAV. Stands by silently in your Mac menu bar or Windows tray.
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Version 1.0.0 · macOS / Windows
04
JustGit版本管理
Your repositories, within reach.
Review changes, commit, sync repositories and recover from conflicts without leaving your desktop workflow. Stands by silently in your Mac menu bar or Windows tray.
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Version 1.0.0 · macOS / Windows
05
JustRecorder系统录音
Catch the sound. Keep the moment.
Record system audio with a shortcut and save clips without installing a virtual audio driver. Stands by silently in your Mac menu bar or Windows tray.
download
Version 1.0.0 · macOS / Windows
06
JustCleaner清理工具
Make space, with a way back.
Find removable caches, clean up app leftovers and restore retained files. The current release is for macOS. Stands by silently in your Mac menu bar.
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Tele2Local消息转本地笔记
Send a message. Find it on your disk.
Save Telegram messages and attachments into local Markdown files and folders, ready for your own tools.
download
Version 1.0.0 · macOS / Windows
08
Acknowledge
Music音乐手册
A full music handbook, for everyone.
Everything we had to learn sideways, from strangers, at 2am — written down properly this time, in an order that makes sense.
Handbook
Theory
ohsisters.net/acknowledgemusic ↗
09
Senra森罗 · 塔罗与占卜
Tarot and fortune telling, calculated properly.
Our own divination house. We are trying to make divination rigorous, scientific and correctly calculated — the occult deserves unit tests too. Every sound and every note in it was built by hand, by us.
Tarot
Divination
senra.observer ↗
Local tools & skills
Run these locally using their setup guides.
LittleChef家庭菜谱
Recipes, ingredients, cooking notes and menus in your own household cookbook.
Setup & source ↗Little Traveler旅行手册
Turn a trip brief into a bilingual itinerary with maps, bookings and practical notes.
Setup & source ↗Little Doctor健康档案
Organize medical reports into a readable local record for your next doctor visit.
Setup & source ↗Little Ledger家庭账本
Bring balances, bills and source documents into one readable household report.
Setup & source ↗Little Closet本地衣橱
Keep garment photos, outfits and your weekly wardrobe plan together.
Setup & source ↗House rules
Non-negotiable-
Subscribed to an LLM? Then burn every token.
The money is already gone. Leaving tokens unspent is losing twice.
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Either it is fun, or it saves us work.
You cannot step into the same river twice. (Is that relevant?)
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Collect the least information, do the most.
No accounts, no tracking, no newsletter. We do not want your email address.
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Study hard. Wash your hair every day.
Historically we manage one of the two.
Who we are
Four girls living in Shanghai who have known each other for over ten years, all of us working in music and audio. Friends since university — complaining together, slacking off together, poking at the world together.
Some of the steps we use every day simply have no decent tool. You have probably wanted the same ones — so here is our little corner, and everything we finish gets left here for you.
Sound design
Music production
Composition
Vibe coding
Good stuff