What Restrike does, what it will not do, and what happens to what you type into it.
It does arithmetic on numbers you enter. Given your account equity, the instrument you trade and the exposure you want, it works out how many contracts that is, what margin your broker will require, how far the market can fall before you are closed out, and when the next expiry window opens.
It does not recommend a position and does not forecast a return. Every figure it quotes from the backtest is hypothetical and describes past data.
No, and it never will. Restrike cannot place a trade or move money, on any plan. Brokerage import is read-only: it reads what you hold so you do not have to type it, and that is the entire extent of its access to your account.
This is not only a product decision. Discretionary execution is the line that would make this a regulated advisory product, and it is the line that matters.
No. Restrike is a calculator, and its author is not a registered investment adviser. Nothing on this site is a recommendation to buy or sell anything, and nothing here is personalised to your circumstances.
The tool deliberately labels position sizes by consequence rather than by adjective. It will tell you that a size came through the worst month in the sample, or that it did not. It will not tell you that a size is "safe".
No. The whole calculator works signed out, and while you are signed out nothing you type leaves your browser. It is kept in your own browser's local storage.
Signing in adds one thing: your holdings and position log sync across your devices. That is what changes the privacy answer, which is why it is worth stating plainly.
The whole calculator is free, with nothing held back, including syncing your log and holdings across devices.
Pro adds the two things that only help if they happen without you remembering: cycle reminders, an email when your window opens and again on your target day, and read-only brokerage import so your holdings do not have to be typed in.
From your own billing page, reachable from the pricing page while signed in. It is Stripe's portal, so cancelling does not depend on anyone here acting on a request.
Cancelling stops the reminders and the brokerage import. It does not touch your position log or your holdings, and it never traps a connection to your broker: disconnecting a brokerage works whether or not you are subscribed.
No. Payment is handled entirely by Stripe on Stripe's own pages. No card number ever reaches this site, and none is stored here.
Signed out: nothing. Signed in: your email address, your holdings, your position log, and your settings.
There are no passwords, because sign-in is by emailed link. Login tokens and session identifiers are stored only as hashes, so a copy of the database contains nothing anyone could sign in with.
Positions and balances, read-only, through SnapTrade. No brokerage credential ever passes through Restrike: you link your account on SnapTrade's own pages.
The list of calls this site is permitted to make is an allowlist that contains no trading endpoint, and it is checked by an automated test on every build rather than by memory.
Import never overwrites your table on its own. It shows you what came back and waits, because silently replacing a portfolio you typed by hand is not an import.
No. Brokerage data is cached and refreshed roughly once a day, so a position you opened or closed today can be missing or still showing. The Portfolio tab states how old the figures are every time you import, and anything out of date can be typed over.
You can remove your synced log and holdings from inside the tool without deleting your account, and disconnect a linked brokerage at any time, which also tells SnapTrade to forget it.
For full account deletion, email support@userestrike.com.
8,424 overlapping cycles of a monthly at-the-money short put on SPY from 1993 to 2026, closed at 50% of maximum profit, run across every start day so no single entry date sets the result. The span contains both 2008 and 2020.
The full method, and the figures that turned out to be wrong, are on the research page.
Check it rather than trusting it. Every page load re-prices six reference contracts and four margin cases and compares them against the values the backtest produced. The result is printed in the footer of the tool on every tab.
If that line is ever red, do not trust anything else on the page.
Because one contract size does not fit every account. A single SPY contract is already too large for many six-figure portfolios, while SPYM is roughly an eighth of it.
The Sizing tab shows, for your actual equity, what one contract of each is worth and the account size below which each becomes unusable. Two of them are also cash settled, which removes assignment entirely, and the index contracts fall under a different tax regime. Whether that is worth anything depends on your situation, and that is a question for a tax professional rather than for this site.