What Is Thinkorswim?
Thinkorswim is a trading platform operated by Charles Schwab, offering charting, options analysis tools, a scripting language and a simulated paper-trading mode. Unlike a standalone charting site, it is attached to a live brokerage account, so analysis and order entry sit in the same window.
Covered on this page: TradingView.
Thinkorswim is a broker’s platform rather than a charting site, and that difference decides almost everything about how it should be used - starting with the fact that every chart on it sits next to a live order ticket.
How it works
It is operated by Charles Schwab, which acquired it along with TD Ameritrade, and it runs as a desktop application as well as in a browser and on mobile.
Charts, scanning, options tools and order entry share one window. The analysis you do and the position you take are not in separate places, which is the whole design.
It carries its own scripting language, thinkScript, for writing custom studies and scan conditions - similar in purpose to Pine Script and with a much smaller public library.
What the depth actually buys
The options tooling is the strongest part. Analysis of spreads, probability curves and position risk graphs are built in rather than bolted on, which is not true of most charting sites.
Paper trading is genuinely good. The simulated mode runs the same interface on delayed data, so you can learn the platform without learning it with money.
And the scanner works on the account’s own data feed. You are filtering the same universe you can trade, with no gap between what the screen shows and what you can act on.
A worked example
A new user opens the platform and sees a dozen panels. Charts, a watchlist, an options chain, an order ticket, a scanner and several analysis tabs are all present at once.
The reasonable response is to turn most of it off. Almost none of it is needed to answer the only questions that matter early on: what am I buying, how much, and where am I wrong.
The paper account is where the exploring belongs. Every feature behaves identically in simulation, so the learning curve can be climbed at no cost, which is a rare thing to be offered.
Simulation does not replicate everything. Fills are modelled rather than real, so slippage and partial fills in thin names are the part of the experience paper trading cannot teach you.
The original data
On this site’s shared series: median bar range 0.493, ninetieth percentile 1.101, largest bar 2.338. Direction runs average 2.01 bars with a longest of 11. A round trip costs 0.0098, about 2% of the median bar range.
The round trip is the figure to hold against a one-click platform. Commission-free equity trades are standard now, but the spread is not commission, and it is paid on every entry and exit regardless of what the ticket says.
And direction turning every 2.01 bars is what makes convenience expensive. A platform that shortens the distance between seeing something and acting on it will produce more trades in a market that offers a fresh-looking reason roughly every two bars.
What thinkScript is for
It is the platform’s own scripting language, used to write custom studies, custom scan conditions and alert logic that the built-in tools do not cover.
Its main advantage is the scanner. A condition written in thinkScript can be run across the whole tradable universe, so a rule you can describe precisely becomes a filter rather than something you check chart by chart.
Its main limitation is the ecosystem. There is no large public library of shared scripts, so most of what you run is either built in or written by you, and borrowed code is harder to come by.
Which cuts both ways. Less borrowed code means fewer impressive-sounding studies of unknown construction, and it also means the cost of a custom idea is your own time rather than a search.
Charting platform versus broker platform
A charting site separates looking from doing. You analyse in one place and place the order somewhere else, and the gap between the two is a pause.
A broker platform removes the pause deliberately. That is a feature for somebody executing a plan and a problem for somebody still forming one.
Neither arrangement is better in general. They suit different stages, and the honest question is which of the two failure modes you are more prone to - hesitating, or acting too easily.
The practical compromise is to use both. Analyse where you cannot trade, trade where you have already decided - which costs nothing, since both a charting site’s free tier and a paper account are free.
When it fails
The characteristic failure is confusing features with progress. The platform rewards exploration - there is always another study, another scan, another analysis tab - and the exploring feels like work.
Meanwhile the decisions stay unmade. What to trade, how much, where the idea is wrong and when to leave are questions no panel answers, and a platform this deep can absorb months without ever raising them.
A second failure is trading options because the tools are there. Good instrumentation for an instrument is not a reason to use that instrument.
A third is treating paper results as evidence. Simulated fills and real fills differ, and simulated psychology is not psychology at all.
A fourth is building elaborate thinkScript studies before establishing that the plain version of the idea works.
And a fifth is leaving the order ticket open while you analyse. The distance between a thought and a position should be longer than one click, and on this platform it is the user who has to supply that distance because the software deliberately does not.
Related
TradingView covers the standalone charting platform people compare it to. Paper trading covers what simulation can and cannot teach. And options covers the instrument its strongest tools are built for.
The thing that separates this from a charting site is one click. On a chart you look; here you look and the order button is right there. That is genuinely convenient and it removes a pause that was doing useful work, and nobody mentions that when they list the features.
— Michael Whitman
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