Comparison

ZeroSigma vs ThetaForge

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

ZeroSigma

This app provides real-time options analytics for traders, focusing on dealer positioning and market structure. It tracks key exposure metrics and strike-level positioning to help understand potential price influences. The mobile interface offers a fast and focused way to monitor market data on the go.

Highlights
  • Real-time exposure metrics
  • Strike-level positioning insights
  • SPX/SPY dealer positioning
  • Fast mobile interface
  • Secure account access
  • Options flow and volume tracking
Features
Read full description

ZerσSigma is a real-time options analytics platform built for traders who want to understand dealer positioning and market structure. Track key exposure metrics across SPX, SPY, QQQ, and NDX, with explicit 0DTE and 1DTE views designed to separate today's positioning from the next expiration. Explore gamma exposure, delta exposure, vanna, charm, higher-order Greeks, volume, GEX Flow, and Dealer Directional Open Interest at the strike level. Switch between Normal and Delta-Adjusted gamma views and examine how positioning changes across strikes and expirations. ZerσSigma Mobile provides a fast, focused interface for monitoring market structure wherever you trade. Features: • SPX, SPY, QQQ, and NDX coverage • 0DTE and 1DTE positioning • Gamma Exposure with Norm and Δ-Adj views • Delta, Vanna, Charm, Theta, Speed, Vomma, and Zomma exposure • Dealer Directional Open Interest (DDOI) • GEX Flow and options volume • Strike-level positioning analysis • Real-time market data and exposure updates • Secure account-based access Create an account in the app to get started. Premium access requires an auto-renewable subscription. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/?utm_source=chatgpt.com Privacy Policy: https://zerosigma.co/privacy?utm_source=chatgpt.com

About

ThetaForge

Read full description

ThetaForge helps you model, visualize, and understand options strategies in a visual, educational environment. Build single-leg and multi-leg options structures, explore payoff behavior, adjust volatility assumptions, and test theoretical scenarios across price and time. Whether you are learning options mechanics or comparing complex strategy shapes, ThetaForge gives you a clear way to understand breakevens, defined risk, payoff behavior, and model-based outcomes. ThetaForge is designed as an educational strategy modeling tool — not a brokerage, signal service, or financial advisor. What you can do with ThetaForge Create and analyze options strategies including calls, puts, spreads, covered positions, and multi-leg structures. Visualize strategy payoff across a range of underlying prices. Explore breakevens, max profit, max loss, and risk-defined behavior. Adjust volatility assumptions to see how theoretical values may change. Model scenarios across price movement, time, and implied volatility. Compare strategy behavior before expiration and at expiration. Use strategy templates and guided explanations to better understand common options structures. Review neutral, risk-focused explanations that explain mechanics without telling you what to trade. Built for options learners and strategy builders ThetaForge is for people who want to understand how options strategies behave. It can help you explore questions like: How does this spread behave if the underlying moves up or down? Where are the breakeven points? How much risk is defined upfront? How does volatility affect the theoretical value of the position? What happens as time passes? How do multiple legs interact inside one strategy? Educational, visual, and privacy-conscious ThetaForge focuses on strategy modeling and theoretical analysis. It does not connect to brokerages, place trades, provide trade signals, or provide personalized investment recommendations. It is built to help you explore mechanics, structure, payoff, and risk in a clearer way. Important disclaimer ThetaForge is provided for educational and informational purposes only. It does not provide financial, investment, trading, tax, or legal advice. Options involve risk and are not suitable for all investors. Theoretical outputs, models, and scenarios are estimates only and may differ from real market prices, fills, liquidity, assignment behavior, taxes, fees, and other real-world outcomes. Always do your own research and consult a qualified financial professional before making financial decisions. License Agreement By downloading or using ThetaForge, you agree to Apple’s Standard End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

ZeroSigma4 screens
ThetaForge4 screens

Verdict

The call

The clearest difference is iOS requirement: ThetaForge at 13.0 against ZeroSigma's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. ZeroSigma sells 2 in-app purchases, starting at $79.00 per month and ThetaForge sells 2 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

ZeroSigma ships an update monthly, ThetaForge fortnightly. The most recent releases landed on October 6, 2026 and September 25, 2026 respectively.

Scorecard1 real difference · 9 level
ZeroSigma versus ThetaForge: the parameters behind the verdict, then further details
ParameterZeroSigmaThetaForge
PriceFreeFree
Rating5.0 (3 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings3 — better—
Update frequencyMonthlyFortnightly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS15.113.0 — better
Further details — not scored
Size31 MB70 MB
Age rating4+4+
DeveloperZeroSigmaOne Nonstop Engineer LLC

In-app purchases

2 purchases

ZeroSigma

Subscriptions2
  • ZeroSigma Premium$79.001 Month
  • ZeroSigma Premium$699.001 Year
2 purchases

ThetaForge

Subscriptions2
  • ThetaForge Pro Monthly$14.991 Month
  • ThetaForge Pro Yearly$134.991 Year

Questions

Is ZeroSigma free?
ZeroSigma is free to download, with in-app purchases available.
Is ThetaForge free?
ThetaForge is free to download, with in-app purchases available.
Do ZeroSigma or ThetaForge have ads?
Neither ZeroSigma nor ThetaForge shows ads.
Which is updated more often, ZeroSigma or ThetaForge?
ZeroSigma ships an update monthly, and ThetaForge fortnightly. Most recently, ZeroSigma was updated on October 6, 2026 and ThetaForge on September 25, 2026.

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