I just recently joined TI after their yearly $8.99 Trial Run. They gave 25% discount over their yearly subscription of $1068 or $801 with discount but you can easily find 20% discount on the Internet.
The main advantage to TI over free services is real time intraday scanning with alerts. As a daytrader, the ability to know what stocks are moving suddenly is essential. For that you need a dedicated service that can process the mountain of <1 minute price data for the entire universe of equity stocks.
I've explored other free options in order to see if I can replicate TI's functionality. For premarket scans for biggest movers, IBKR is excellent. I compare ThinkOrSwim, IBKR and TI's premarket scanners, I like IBKR the best. TI doesn't start processing until 6:45am EST. IBKR starts at 4am EST.
For intraday scanning, I've compared TI, IBKR, TOS, TradeStation. The advantages of TOS and TradeStation is that you can use their programming language (ThinkScript, EasyLanguage) to create custom scans which can replicate TI for free. The cons that I've found with ThinkScript is that even tho you can scan 1 minute data, setting it up in a watchlist which will allow alerts but at 3-5 minute interval. By then, the opportunity may be gone. TradeStation RadarScreen will only allow 1000 symbols for scanning. So you will have to first parse down a limited universe of stocks before you can scan. Big disadvantage since entire equity universe is >5700 symbols.
Con with TI is that to customize scans, you will need to dig through their large library of parameters. They don't have a programming language, rather they have a distinct parameter for every type of alert that you may want ie New High, New High Ask, New Ask (filtered). With a programming language, all of that is replaced much more neatly. Perhaps for non-programming people, it's not a con.
Trade-Ideas Stock Scanner Help - Alert and Filter Definitions and System Requirements
I haven't tried Scanz but would love if anyone has a detailed comparison of the 2 services. TI during the trial run had said they were coming out with next generation version this year.
Sometimes I feel that TI is lagging a bit as some of the intraday scans come 10-15 minute after the fact. It would great to see how Scanz vs TI compare with the same scan. Which one delivers it faster in real-time.
An example of a TI scan which I feel might be lagging.
Who users what and likes and dislikes of those setups ?