OPTIModel vs TriggerTract
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OPTIModel
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.
- Long bone metastasis decision support
- Survival estimation flowchart
- Local treatment recommendation
- Metastasis location and extent analysis
- Clinical decision-making aid
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This application is designed to aid clinicians in the decision-making of any patient presenting with long bone metastases. First users are guided through a flowchart to estimate the remaining survival. Subsequently, users are guided through a second flowchart to receive a recommendation for local treatment, based on the initial survival estimation and the location, extent, and presentation of the metastasis. This application does not serve as treatment protocol and no rights may be derived from this information by physicians or patients.
TriggerTract
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TriggerTract is a self-management app designed to support people living with Irritable Bowel Syndrome (IBS) and histamine intolerance (HIT). Built from personal experience, the app helps users better understand symptoms, identify patterns, and manage daily wellbeing. With TriggerTract you can: • Log symptoms, meals, drinks, bowel habits, and stool consistency • Receive AI-guided insights, wellbeing suggestions, Predictions, and Reports • Build personal safe and trigger food lists using the Explore feature • Save preferred locations with the integrated map feature • Use the app in guest mode or sign in with Google or Apple • Choose Light Mode or Dark Mode independently from device settings • Benefit from adaptive text sizing and an accessible user interface • Access a dedicated Guide tab on each screen to help you understand and use the app’s features In guest mode, information is stored securely on your device. In account mode, data is securely stored to support account access and synchronisation across sessions. TriggerTract is designed to support awareness and everyday wellbeing, but it is not a medical device and does not replace professional healthcare advice. Always consult a qualified healthcare professional regarding medical concerns, dietary changes, or supplements.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | OPTIModel | TriggerTract |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 2 months — better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 8.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 16 MB | 31 MB |
| Age rating | 12+ | 12+ |
| Developer | LUMC Leiden | Malda Shushku |
In-app purchases
OPTIModel
No in-app purchases
TriggerTract
No in-app purchases





