Quote from learner2007:
Matsui's platform was developed and is supplied to a number of brokers by Simplex. Orix, Joinvest and others I can't recall use it.
The platform is basically the same for all, but the features differ somewhat from broker to broker. The platform is stable and doesn't lag. The main drawback is that its charting is very basic and cumbersome to use. But regarding charting, that can be said for all the charting available here with the exception of TradeSignal which is offered by Himawari. Charting is important for me so I use eSignal. But if you are not daytrading and yet require a good charting package, I would recommend eSignal On Demand. You get most of the features in eSignal's main package and delayed data for $30. But if you need ranking lists, you must use a Japanese broker. Not knowing what type of trading you do makes it hard to say what might fit your needs. But in any event you just have to try one after another until you find what you like.
You may already know this but the main platforms available here in addition to those mentioned above are:
1. Rakuten's Market Speed.
2. SBI's Het.
3. Kabu.com's Kabu Machine
4. Okasan's ???
5.IDO's IDO Trader
There is no problem with short selling here . Most of the brokers encourage you to open the required margin account.
Hope this helps.