POTTER vs SIMPL
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
POTTER
This medical tool provides an accurate and user-friendly way to calculate emergency surgery risks. It's based on a machine learning algorithm derived from extensive research.
- Emergency surgery risk calculation
- Machine learning algorithm
- User-friendly interface
- Based on published research
- Highly accurate
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POTTER is a highly accurate and user-friendly emergency surgery risk calculator developed by George Velmahos (MD, PhD), Haytham Kaafarani (MD, MPH), Dimitris Bertsimas (PhD), and Jack Dunn (PhD). This Machine Learning Algorithm is the digital manifestation of the research found in the October 2018 Annals of Surgery publication, “Surgical Risk Is Not Linear: Derivation and Validation of a Novel, User-friendly, and Machine Learning-based Predictive OpTimal Trees in Emergency Surgery Risk (POTTER) Calculator.”
SIMPL
This app facilitates workplace-based assessments for medical professionals, enabling the evaluation of entrustable professional activities within medical education settings.
- Workplace-based assessments
- Entrustable professional activities
- Medical education implementation
- Professional development tracking
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SIMPL: Society for Improving Medical Professional Learning makes it feasible to implement workplace-based assessments, including assessment of entrustable professional activities, across medical education.
Screenshots
Verdict
The clearest difference is update cadence: SIMPL at every 2 weeks against POTTER's every 8 months. SIMPL also leads on ratings volume (16 vs 5). POTTER's advantage is rating (4.4 vs 4.1) and review sentiment (50% vs 40%). On price, ads, in-app purchases and monetization model 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.
POTTER holds the better App Store score, 4.4 against 4.1. Both are backed by a comparable volume of ratings — 5 and 16 respectively. Written reviews point the same way: 50% of POTTER's written reviews are positive against 40% of SIMPL's.
POTTER ships an update every 8 months, SIMPL every 2 weeks. The most recent releases landed on June 1, 2026 and September 3, 2026 respectively.
| Parameter | POTTER | SIMPL |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (5 ratings) — better | 4.1 (16 ratings) |
| Positive reviews | 50.0% of reviews — better | 40.0% of reviews |
| Number of ratings | 5 | 16 — better |
| Update frequency | Every 8 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 11.2 — better | 15.0 |
| Further details — not scored | ||
| Size | 8 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Interpretable AI LLC | Procedural Learning and Safety Collaborative, Inc |
Customer experience
POTTER
SIMPL
In-app purchases
POTTER
No in-app purchases
SIMPL
No in-app purchases
