What is the fastest stock scanner which can provide actionable alerts?

[cassiopeia]

So far I've paid about a thousand dollars for premium scanners and stock alert systems. All of them seem lacking in some way for practical actionable trading. Has anyone found an alert system which instantly sounds as soon as a stock has (for example) increased more than 10 or 20% on the premarket open?

So far I've tried Tradingview premium, Momo Pro, Warrior trading, Benzinga and Trading Ideas.

I suspect some of these scan the market only once a minute, so the average delay is 30 seconds, which is far too late.

Warrior trading settings are fixed, with some scanners linked to volume or other criteria which delays the alert.

Trading view will alert immediately if an indicator setting or line is broken on a specifically chosen stock, so it can be done. Unfortunately I need a scanner covering all low float US stocks which tells me which one meets the criteria. Their screener can in theory be set to show the top gainers, but to update you need to keep refreshing, and there's no audible alert for the screener anyway.

Benzinga provides verbal tickers which meet criteria, but the ticker quickly disappears from the written list.

A trader on YouTube suggested the free Think or Swim scanner could be configured like warrior trading. This means setting up an account with them though.

I might try Trading Ideas again which everyone says is fast, but the last time I tried it seemed to give me false positives beyond what I had set, which deluged me with alerts.

 

[cassiopeia]

I think someone replied suggesting scanners which use multiple criteria which assist a manual trade are more important than speed.

Certainly relying on one variable such as price isn't a suitable strategy, this needs to be combined with other factors such as volume to confirm entry. The problem there is by definition once volume has increased a lot of traders & bots are already in, and have usually moved up the price before you can type out the ticker and performed a few due diligence checks. Your only option with these fixed multiple criteria scanners is to get in high at the height of the storm in the hope of getting out higher, scalping in effect

An alert based on a simple 10% trailing gain/stop or even 10% above the previous session high might provide more time to prepare for the necessary checks, so as the volume increases or/and the price passes key resistance levels you are ready to 'press go' just before the main rush. Of course the risk then is then the rush doesn't happen, but that type of approach is what I wish to try out.

Strictly speaking the advantage of speed might only apply to fast momentum trading, usually smallcap stocks with explosive potential after breaking news or a rumour.