# OPTIModel vs TriggerTract

The clearest difference is update cadence: OPTIModel at every 2 months against TriggerTract's every 8 months. OPTIModel also leads on iOS requirement (8.0 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

OPTIModel ships an update every 2 months, TriggerTract every 8 months. The most recent releases landed on September 27, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | OPTIModel | TriggerTract |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 8 months |
| Monetization | Free | — |
| Size | 16 MB | 31 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 12+ |
| Developer | [LUMC Leiden](https://appshunter.io/developer/534193927) | [Malda Shushku](https://appshunter.io/developer/1842459832) |

## What reviewers say

### OPTIModel

[App page](https://appshunter.io/ios/app/optimodel/id1235461963)

This app assists clinicians in making treatment decisions for patients with long bone metastases. It uses flowcharts to estimate survival and recommend local treatments based on metastasis characteristics.

**Highlights:** Long bone metastasis decision support, Survival estimation flowchart, Local treatment recommendation, Metastasis location and extent analysis, Clinical decision-making aid

**Features:** macOS Compatibility

**In-app purchases:** none


### TriggerTract

[App page](https://appshunter.io/ios/app/triggertract/id6753092295)

**In-app purchases:** none


## Frequently asked questions

### Is OPTIModel free?

OPTIModel is free to download, with no in-app purchases.

### Is TriggerTract free?

TriggerTract is free to download, with no in-app purchases.

### Do OPTIModel or TriggerTract have ads?

Neither OPTIModel nor TriggerTract shows ads.

### Which is updated more often, OPTIModel or TriggerTract?

OPTIModel ships an update every 2 months, and TriggerTract every 8 months. Most recently, OPTIModel was updated on September 27, 2026 and TriggerTract on October 8, 2026.

---

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