Head-to-head review
NBMEcalc vs AMBOSS Step 2 CK Predictor
AMBOSS's predictor is a free hook to drive subscription upgrades — it only works inside their ecosystem. NBMEcalc is source-agnostic. Here is the comparison.
Feature-by-feature
| Feature | NBMEcalc | AMBOSS Predictor |
|---|---|---|
| Works without AMBOSS subscription | ||
| Exam-specific NBME forms | ||
| UWSA 1 & 2 input | ||
| Free 120 input | ||
| CMS Form subject input | ||
| Multi-input weighted aggregation | ||
| 95% confidence interval | ||
| Personalized study plan | ||
| Free unlimited use | ||
| Mobile / PWA | ||
| Detailed methodology document |
NBMEcalc
- Works without AMBOSS subscription
- Exam-specific NBME forms
- UWSA 1 & 2 input
- Free 120 input
- CMS Form subject input
- Multi-input weighted aggregation
- 95% confidence interval
- Personalized study plan
- Free unlimited use
- Mobile / PWA
- Detailed methodology document
AMBOSS Predictor
- Works without AMBOSS subscription
- Exam-specific NBME forms
- UWSA 1 & 2 input
- Free 120 input
- CMS Form subject input
- Multi-input weighted aggregation
- 95% confidence interval
- Personalized study plan
- Free unlimited use
- Mobile / PWA
- Detailed methodology document
When AMBOSS Predictor makes sense
If you are already a heavy AMBOSS user — questions, library, and SA — their built-in predictor is convenient and well-integrated. You get a quick estimate inside the same tab.
When NBMEcalc wins
- You used UWorld + NBMEs (no AMBOSS subscription required)
- You want to combine multiple sources for a tighter prediction
- You want a 95% confidence interval (AMBOSS gives a point estimate only)
- You want a personalized study plan based on your weak rotations
- You don't want to be locked into a specific Q-bank brand
Bottom line
AMBOSS Predictor is a feature, not a tool. NBMEcalc is a dedicated, source-agnostic predictor. If you use multiple Q-banks (most students do), NBMEcalc combines them into a single multi-source estimate.
Try the source-agnostic alternative
Works with UWorld, NBME, UWSA, Free 120, and CMS forms — run the Step 2 CK predictor or the Step 1 predictor.