USMLE Step 2 CK

Know your number before exam day.

Enter your NBME and UWSA forms. Get the range a calibrated model projects, see how it did on real students, then drill the weak system in the app that carries the same gauge.

269 real score reports80% within 7 points, out of sample7,700+ questionsApp Store 4.8
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FREE TO START · iOS 17+ · BUILT BY A MED STUDENT WHO SCORED 270
Readiness checkSAME MATH AS THE APP

Your practice forms, one projection

Form
Score
Days before exam
Form
Score
Days before exam
Projected Step 2 CK
246to260
most likely 25355th percentileTight band
Add your exam date in the full check for the pass-line verdict and the trajectory. Nothing you type leaves this page.
33 / 40
r/step2 posters the model never trained on landed inside their range
+9
average climb from practice average to the real score, at the middle
4
median points off, out of sample, updated every Monday
6
forms a typical student takes; the last two weeks are the signal

It shows its work, every Monday.

The full record →

Every new student who gets a real score is judged against the frozen model. The misses stay on the board. This is the same card that sits under the readiness gauge in the app.

Track recordupdates every Monday
7/10
of the last 10 students to get their real score landed inside the range the model gave them. Typical miss 7 points.
5 formsr/
0
1 formr/
-36
6 formsr/
-7
9 formsr/
+1
8 formsr/
-4
6 formsr/
-10
7 formsr/
-4
3 formsr/
-7
Points off, newest first. r/ marks an r/step2 score report. Calibrated on 239 published outcomes: 70% within 7 points.
Why the model is flatter than "add 10"

Students under 235 climbed about 20 points; students over 265 climbed about 2. The line bends because low averages contain bad days. The data, 269 students →

Why your last form counts most

A form from three weeks out carries half the weight of one from this week. Old forms read low because of when they were taken, not which form.

Which forms lie

NBME 9 prints about 6 points low, UWSA 2 about 5 high, UWSA 3 about 8 low. Modern NBMEs are equated and left alone. The corrections are applied for you.

The app

The same projection, with a gauge that moves when you study.

7,700 questions written the way a Step 2 attending asks them: pattern to diagnosis, then the next best step as a full management chain. Spaced repetition that drains your misses. A readiness gauge with its track record attached.

  • Buzzwords, CK Gold, Next Best Step chains
  • Visual Dx: 890+ images
  • Weekly leagues and a results screen that scores every round
  • Readiness gauge with the track record
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Free to start. Pro unlocks the full bank and the coach. 1,200+ students.
Step Gunner home screenRound results with the accuracy ringWeekly league

Read the evidence.

Everything on this site is grounded in data you can check: published score reports, a frozen model, a public record.

ResearchI pulled 269 NBME to Step 2 score pairs off Reddit. Here is what actually predicts your score.

Climb by starting band, the recency half-life, which forms read off scale, and the model's out-of-sample record.

Read →GuidesClerkship guides with honest resource stacks

What to do each week of the rotation and where Step Gunner fits, with real deck counts.

Browse →MethodologyHow the predictor works, constant by constant

The anchor, the shrinkage, the band widths, the form offsets, and the live out-of-sample numbers, imported from the same code that runs the calculator.

Open →

From the App Store

Verbatim, from 5-star reviews.

★★★★★

“This app makes studying so effortless and fun. Highly recommend.”

5-star App Store review, "Best Step 2 supplement"
★★★★★

“Gotten me multiple questions on practice tests. Helpful for those not keen on the Anki burden but who like spaced repetition.”

5-star App Store review

Run your numbers, then go study.

The calculator is free and stays free. The app is where the number starts moving.

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