# ZeroSigma vs ThetaForge

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.

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.

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

## The numbers

| Metric | ZeroSigma | ThetaForge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/zerosigma/id6762913916/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | Freemium | — |
| Size | 31 MB | 70 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [ZeroSigma](https://appshunter.io/developer/1895074107) | [One Nonstop Engineer LLC](https://appshunter.io/developer/1896769831) |

## What reviewers say

### ZeroSigma

[App page](https://appshunter.io/ios/app/zerosigma/id6762913916)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZeroSigma Premium | $79.00 | per month |
| ZeroSigma Premium | $699.00 | per year |


### ThetaForge

[App page](https://appshunter.io/ios/app/thetaforge-options-analyzer/id6771045129)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ThetaForge Pro Monthly | $14.99 | per month |
| ThetaForge Pro Yearly | $134.99 | per year |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*