CeDAR vs SIMPL
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CeDAR
This app helps predict the risk and financial impact of wound complications after ventral hernia repair. It uses a mathematical equation based on patient health status to offer individualized outcomes and educational materials about hernias and treatments.
- Predicts postoperative wound complication risks
- Estimates financial impact of complications
- Provides individualized patient outcomes
- Offers educational materials on hernias
- Calculates risk based on user-answered questions
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Hernia repairs are among the most common operations performed in the world. Historically, quality was measured almost solely by recurrence rates. Now that routine mesh use has made these repairs much more durable, wound problems after surgery are the major reason for increased cost of surgery, including the added cost of other procedures, hospital stays and clinic visits because of wound problems up to a year after hernia repair. Because of their wounds, these patients often are not able to work and lose time and money because of specialty wound care, travel, clinic visits and/or hospital stays. We believe assessing and understanding a patient's preoperative health status can significantly impact postoperative outcomes. The Carolinas Equation for Determining Associated Risks (CeDAR) predicts the risks and financial impact of wound-related problems following ventral hernia repair. The complex mathematical equation, which was calculated from data taken from patients around the world after their surgery, has been independently tested and found to be accurate and reliable. With the aid of mobile app technology, CeDAR now provides surgeons and patients with a powerful tool that can predict individualized wound outcomes after abdominal hernia surgery. Moreover, it offers patients detailed educational materials about many types of hernias and their treatments. Users simply answer eight questions about themselves, including height and weight. Based on these answers, a percentage chance of developing specific postoperative complications requiring treatment is calculated along with the corresponding cost of this treatment. These results can then be used to discuss an individual patient's risk for wound problems after surgery and what they can change to improve their odds for a good result.
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 rating: CeDAR at 5.0 against SIMPL's 4.1. CeDAR also leads on iOS requirement (8.0 vs 15.0). SIMPL's advantage is update cadence (every 2 weeks vs every 18 months) and ratings volume (16 vs 2). 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.
CeDAR holds the better App Store score, 5.0 against 4.1. That said, the two scores are not equally well evidenced: SIMPL has 16 ratings behind it against 2, so its average is the more settled of the two.
CeDAR ships an update every 18 months, SIMPL every 2 weeks. The most recent releases landed on October 12, 2026 and October 5, 2026 respectively.
| Parameter | CeDAR | SIMPL |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 4.1 (16 ratings) |
| Positive reviews | — | 40.0% of reviews |
| Number of ratings | 2 | 16 — better |
| Update frequency | Every 18 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 | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 37 MB | 37 MB |
| Age rating | 12+ | 4+ |
| Developer | Carolinas Surgical Innovation Group, LLC | Procedural Learning and Safety Collaborative, Inc |
Customer experience
CeDAR
SIMPL
In-app purchases
CeDAR
No in-app purchases
SIMPL
No in-app purchases








