Platform comparison
StockMojo vs Opstra
Both cover the Indian options market, but they are built for different moments in a trade. Here is what separates them, where Opstra is stronger, and how to pick.
- Last reviewed
- Platforms covered
- 2
- Written by
- Stockman editorial
Short answer
StockMojo is the deeper platform on both historical analysis and tool coverage. It offers backtesting and, unusually, runs historical mode across the tools themselves: the option chain, OI build-up, IV skew and straddle chart can each be rewound to a past date and read as they stood. It also carries gamma exposure, index contribution, advance-decline, vega analysis, sector-rotation RRG and a full futures suite that Opstra does not offer, and is free before 10:00 AM and after market close where Opstra expects a subscription. Opstra remains a competent volatility workbench, but there is no capability in this comparison where it is ahead.
Who should pick which?
Pick StockMojo if:
Your edge comes from reading the chain: where open interest is building, how IV is skewed across strikes, what the ATM straddle is pricing. You want that free in the pre-open and after the close, and you are content executing in your broker terminal.
Pick Opstra if:
Option sellers who want a dense, no-hand-holding volatility workbench and nothing beyond it.
Opstra is the wrong choice for someone new to options, or anyone who mainly needs a fast intraday read on where OI is shifting.
Which platform covers more, StockMojo or Opstra?
Across the 16 capabilities compared below, StockMojo is ahead of or level with Opstra on 16 of them.
- StockMojo leads
- 4
- Level
- 12
- Opstra leads
- 0
There is no capability in this comparison where Opstra is ahead of StockMojo.
How do StockMojo and Opstra compare feature by feature?
16 capabilities that matter to an Indian options trader. “Partial” means the feature exists but is materially thinner than a dedicated implementation.
| Capability | StockMojo | Opstra |
|---|---|---|
| Live option chain Strike-by-strike LTP, open interest, volume and implied volatility for the current expiry. | Yes | Yes |
| Strike-wise OI change Change in open interest per strike through the session, rather than the end-of-day snapshot alone. | Yes | Yes |
| Multi-strike OI in one view Open interest across several strikes on a single chart, instead of one strike at a time. | Yes | Yes |
| Put-Call Ratio Ratio of put OI to call OI, used as a crude sentiment gauge. | Yes | Yes |
| Max pain The strike at which the largest rupee value of options expires worthless. | Yes | Yes |
| IV chart and skew Implied volatility over time, and how IV differs across strikes at the same expiry. | Yes | Yes |
| ATM straddle chart Intraday combined premium of the at-the-money call and put: a direct read on expected movement. | Yes | Yes |
| Strategy builder Assemble multi-leg positions and see combined margin, breakevens and Greeks. | Yes | Yes |
| Payoff chart Profit-and-loss curve for a multi-leg position across the underlying price range. | Yes | Yes |
| Historical backtesting Run a strategy against past option data to see how it would have performed. | Yes | Yes |
| Historical mode across tools Rewind the analytics themselves (option chain, OI, IV, straddle) to any past date and read them as they looked then, instead of only backtesting a strategy. | Yes 1 | Partial |
| FII/DII flow data Daily net buying and selling by foreign and domestic institutions. | Yes | Partial |
| Place orders directly Send an order to your broker from inside the platform, without switching to a terminal. | No | No |
| Whole tool list open without paying Whether every tool can be opened and used without a subscription, as opposed to a catalogue where the better tools are locked until you pay. | Yes 2 | No |
| Usable free tier Core analytics available without a paid subscription, as opposed to a time-limited trial. | Yes 3 | Partial |
| Native mobile app A dedicated iOS/Android app, as opposed to the site in a mobile browser. | Partial 4 | Partial |
- StockMojo, Historical mode across tools: Historical mode runs across most tools. Option chain, OI, IV and straddle can each be rewound to a past date, rather than only replayed inside a backtester.
- StockMojo, Whole tool list open without paying: Every tool is open in the free window, before 10:00 AM and again after market hours. No tool is permanently locked behind the paid tier.
- StockMojo, Usable free tier: Two routes in: a 7-day trial that opens the entire site, and an ongoing free window covering every tool until 10:00 AM and again after market hours. Live mid-session access after the trial is the paid tier.
- StockMojo, Native mobile app: Mobile-responsive site, but no native iOS or Android app.
How much do StockMojo and Opstra cost?
The two gate access differently, which matters as much as the headline number. StockMojo gates by clock: every tool is open before 10:00 AM and again after the close. Opstra gates by feature, so its limits apply whatever time you log in.
On the cheapest recurring plan, StockMojo costs ₹499 a month against ₹1,300 for Opstra, 2.6× less.
StockMojo
A 7-day trial opens the whole site, then ₹499 for a month, ₹1,349 for three months or ₹4,199 for a year, all plus 18% GST. No broker account is required.
- 1 month
- ₹499 Plus 18% GST
- 3 months
- ₹1,349 Plus 18% GST; about ₹450 a month
- 12 months
- ₹4,199 Plus 18% GST; about ₹350 a month
Opstra
₹1,300 for a month, ₹6,000 for six months and ₹11,000 for a year, all plus 18% GST. Subscriptions are non-refundable.
- 1 month
- ₹1,300 Plus 18% GST
- 6 months
- ₹6,000 Plus 18% GST
- 12 months
- ₹11,000 Plus 18% GST
Each figure is the total charged for that period rather than a monthly rate, so the two columns compare directly. Prices last checked 2026-07-28. Subscription costs in this category change without much notice, so treat any figure here as a starting point and confirm with the vendor before you pay.
What is Opstra?
Opstra DefineEdge is an options analytics suite aimed at traders who treat option selling as a quantitative exercise. Its centre of gravity is volatility: IV charting, strategy building, OI analysis and payoff modelling are all present, presented densely and with little hand-holding. It is a focused options workbench rather than a broad market-analytics suite.
What is StockMojo?
StockMojo is a browser-based analytics platform for Indian derivatives traders. It covers the option chain in unusual depth (strike-wise open interest, multi-strike OI on one chart, PE-CE OI difference, IV skew, IV versus historical volatility, max pain, ATM straddle pricing and premium decay) alongside futures dashboards and daily FII/DII flow data. Its defining feature is that most of those tools run in historical mode as well as live: you can rewind the option chain, the OI build-up or the straddle chart to a past date and read it exactly as it looked then. It is an analysis layer, not a broker. You read the market on StockMojo and execute in your own broker terminal.
What does Opstra do well?
- Serious volatility analysis. IV charting and volatility modelling go beyond a single skew chart, which matters if you write options systematically.
- Built for people who already know options. Nothing is dumbed down. For an experienced seller that density is a feature.
Where is StockMojo better than Opstra?
- Historical mode on the tools themselves, beyond a strategy backtester. Most competitors let you backtest a strategy against past data. StockMojo lets you rewind the analytics themselves: put the option chain, OI build-up, IV skew or straddle chart back to any past date and read it as it looked at the time. That is how you study what a real expiry day or a gap-open did, rather than only what a strategy would have returned.
- A 7-day trial that opens the entire site. Not a feature-limited sample. The trial covers every tool at full access, so you can judge the platform on the work you actually do rather than on a restricted version of it.
- Every tool is open on the free tier before 10:00 AM. Multi-strike OI, PE-CE OI difference, IV grid and volatility skew are all available free in the pre-open and first half hour, the window where positioning for the day gets decided.
- Built around open interest specifically. OI crossover, price-versus-OI scatter and a timeseries option chain exist because OI reading is the product, not a side feature.
- No broker lock-in. Nothing is tied to a particular brokerage account, so the data is the same whoever you execute through.
- Full post-market data at no cost. After the close, the whole dataset opens up again: enough for end-of-day review and next-day preparation without a subscription.
What tools does StockMojo have that Opstra does not?
Beyond the option-chain set both platforms cover, StockMojo carries a market-context layer that Opstra does not attempt.
- Gamma exposure (GEX)
- Where dealer gamma is concentrated by strike: the levels that tend to pin or accelerate index moves.
- Index contribution
- Which constituents are driving a Nifty or Bank Nifty move, weighted by their index impact.
- Advance-decline
- Market breadth: how many names are participating in a move rather than just the index level.
- Vega analysis
- Volatility exposure across a position or the chain, rather than a single IV number.
- Sector rotation (RRG)
- Relative rotation graph showing which sectors are gaining and losing momentum against the benchmark.
- Futures suite
- Futures dashboard, heatmap, intraday view and expiry-cycle OI patterns alongside the options tools.
What are the limitations of each platform?
StockMojo's limitations
- Live session access after 10:00 AM is paid. The free tier covers pre-open through 10:00 AM and everything after the close. Watching OI shift live between 10:00 AM and the close means subscribing, which is a real limitation if you trade the middle of the session.
- No order placement. StockMojo does not route orders. You read here and execute in your broker terminal, which means a second window.
- No native mobile app. The site is mobile-responsive and works in a phone browser, but there is no dedicated iOS or Android app.
Opstra's limitations
- Free access is thin. You will hit the subscription decision quickly compared with platforms that keep core analytics open.
- Steep first week. The interface assumes fluency in options vocabulary and offers little scaffolding to get there.
- Narrow scope beyond options strategy. No gamma exposure, index contribution, advance-decline, sector-rotation RRG or futures suite. The market-context layer sits outside what Opstra covers.
- No order placement. Like StockMojo, it is an analysis layer, so execution happens in your broker terminal.
Which should you choose, StockMojo or Opstra?
Opstra is the closest thing here to a true peer: both are analysis-first, neither places orders, and both take volatility seriously. The split is time horizon. On historical analysis StockMojo is the deeper tool, which cuts against the usual assumption: it offers backtesting and runs historical mode across the tools themselves, so the option chain, OI build-up, IV skew or straddle chart can each be rewound to a past date and read as it stood. StockMojo also carries a much wider toolkit. Gamma exposure, index contribution, advance-decline, vega analysis, sector-rotation RRG and a full futures suite sit alongside the option-chain tools, none of which Opstra attempts. What Opstra retains is a dense volatility workbench with no hand-holding, which suits a seller who wants only that and nothing around it. Cost splits on timing rather than features: StockMojo is free before 10:00 AM and after the close, where Opstra points you toward a subscription fairly quickly whatever the hour.
Frequently asked questions
Is StockMojo a good Opstra alternative?
Yes. StockMojo covers live option-chain and open-interest reading, offers historical backtesting, and runs historical mode across the tools themselves, rewinding the chain, OI and IV to a past date, which Opstra does not do in the same way. It also carries tools Opstra has no equivalent for, including gamma exposure, index contribution, advance-decline, vega analysis and sector-rotation RRG. It is free before 10:00 AM and after the close, where Opstra expects a subscription.
Does StockMojo have backtesting?
Yes. StockMojo supports historical backtesting, and goes further than most platforms by running historical mode across the tools themselves: you can rewind the option chain, OI build-up, IV skew or straddle chart to any past date and read it exactly as it looked then, rather than only testing a strategy against it.
Which is better for option selling, StockMojo or Opstra?
Opstra suits the systematic seller who wants historical evidence and deep volatility modelling before writing. StockMojo suits the seller who is watching OI build-up and IV skew intraday to time entries and adjustments.
Is Opstra free?
Opstra offers limited free access, but sustained use points toward a paid plan. StockMojo is free for every tool until 10:00 AM and again after market hours, with live mid-session access on the paid tier. Confirm current terms with each vendor.
Do I need a broker account for either platform?
No. Both Opstra and StockMojo are analysis layers that do not route orders, so you can use either alongside whichever broker you already trade through.