OptionSlam
optionslam.com
Earnings-focused options research: calendar, past post-earnings versus implied moves, an earnings volatility rating and a backtester, about $20 a month.
What it is
OptionSlam is built around one question: how much does a stock usually move when it reports earnings, and how does that compare with what the options market is pricing in? Each stock page shows past earnings dates, the move after each report, and whether the actual move landed inside or outside the implied move for weekly and monthly expirations. Its Earnings Volatility Rating (EVR) scores how sensitive a stock is to earnings, and an Earnings Index averages the rating across the S&P 500.
Visitors and free members can see basic stock statistics and previews of the calendar, screener and backtesting pages, with history limited to two quarters. The paid Insider membership opens the full earnings calendar with filters, the stock screener, implied move reports, the historical backtesting screener, the OSBTT options strategy tester, watchlists with email alerts, and full historical data.
The site is narrow on purpose. It does not offer a general options chain, flow feed or strategy builder, and its interface is older than most newer options tools.
Key features
- Earnings calendar
- Upcoming earnings with filters for members; free users see a preview.
- Implied move vs actual move
- Implied price move for weekly and monthly options next to each past post-earnings move, marked as inside or outside the implied range.
- Earnings Volatility Rating
- OptionSlam's own score of how strongly a stock reacts to earnings, with a history chart per stock and an S&P 500 Earnings Index.
- OSBTT backtester
- Options strategy testing tool for running historical tests of setups, included in Insider membership.
- Historical screener
- Screens stocks on past earnings behavior; full history for members, two quarters for free users.
- Watchlists and email alerts
- Multiple personal watchlists with optional email alerts for members.
Pricing
| Plan | Price | What you get |
|---|---|---|
| Free member | $0 | Basic stock statistics, live charts and previews of calendar, screener and backtesting; two quarters of history |
| Insider (monthly) | $19.95/mo | Full calendar, screener, implied move reports, OSBTT, watchlists and alerts, full history; auto-recurring via PayPal |
| Insider (annual) | $199/yr | Same access, non-recurring annual payment |
OptionSlam says continuous monthly members keep their rate; the annual non-recurring option may be subject to future price increases. No free trial is described on the membership page.
Free option: Basic stock statistics, free live charts and preview access to the earnings calendar, screener and backtesting pages, with historical data limited to two quarters.
Checked September 25, 2026 on optionslam.com. Prices change; confirm on the provider's site before you subscribe.
Strengths
- Puts past earnings moves and implied moves side by side for each stock
- Low price for the full membership
- Backtester included in the membership rather than sold separately
- Clear focus on one trading style
Limitations
- Free access is limited to previews and two quarters of history
- Only covers earnings-related research; no options chain, flow or strategy builder
- Monthly billing runs through PayPal
- The site's pages publish little detail about the backtester's data range or strategy list
Good fit for
- Options traders who trade around earnings announcements
- Traders comparing implied moves with historical reactions before selling or buying premium
- Budget-conscious traders who want a focused earnings tool
Look elsewhere if
- Traders who want general options analytics or flow (OptionStrat or a flow service fits better)
- Anyone who wants a modern, mobile-first interface
Compare
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OptionSlam questions
How much does OptionSlam cost?
The Insider membership is $19.95 a month on auto-recurring billing, or $199 for a non-recurring year.
What is the Earnings Volatility Rating?
It is OptionSlam's own score of how sensitive a stock's price is to earnings announcements, shown with a history chart on each stock page.
Is the OSBTT backtester included?
Yes, OSBTT is listed among Insider membership benefits and is not priced separately.
What can I see for free?
Basic stock statistics, live charts and previews of the earnings calendar, screener and backtesting tools, with only two quarters of history.
Written from OptionSlam's own website and documentation. All Trading Tools lists and compares tools; it does not recommend trades or give financial advice. Sources: optionslam.com, optionslam.com/insider_member, optionslam.com/backtesting.