# StatRedPen: Stats Exam Grader — Rubric scores, red-pen fixes

> Rubric scores, red-pen fixes (iPhone/iPad app by 丽佳 施.)

- Source: https://appshunter.io/ios/app/statredpen-stats-exam-grader/id6794589846 (this page in markdown: same URL + `.md`)
- Developer: [丽佳 施](https://appshunter.io/developer/1894580777)
- Category: Education, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 5 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China)
- Released: 2026-07-28
- Data updated: 2026-08-12
- User reviews in markdown: https://appshunter.io/ios/app/statredpen-stats-exam-grader/id6794589846/reviews.md

## What is StatRedPen?

Preparing for a statistics essay exam or an oral exam, with nobody to grade your practice answers? Type (or transcribe) your answer and get an instant 100-point rubric score with red-pen feedback — computed entirely on your device. Grading needs no internet connection and no account.

KEY FEATURES
- Question bank for statistics majors: 5 written prompts (Central Limit Theorem, Type I/II errors, correlation vs. causation, least squares & R², Bayes' theorem) plus 3 oral prompts (explaining p-values, confidence intervals, sampling bias)
- Rubric scoring across 5 areas: concept coverage, logical structure, terminological precision, completeness, clarity — 20 points each
- Red-pen feedback: hints for missing concepts, quoted corrections of classic misconceptions, structure suggestions
- Built-in model answers that pass the app's own rubric with a perfect score
- Next-practice recommendation, practice history, streak and best-score stats
- Oral practice: type your transcript, or on supported devices use on-device speech transcription and record-and-replay
- Import a prepared .txt answer file

EVERY FEATURE IS FREE
All 8 questions, unlimited grading, red-pen feedback, model answers, speech transcription and history. Nothing is locked, there is no trial, and there is no subscription.

ADS, AND HOW TO REMOVE THEM
A small banner ad (Google AdMob) sits at the bottom of the question list, history, guide and result screens — never on the answer-writing screen or the purchase screen, and it collapses while the keyboard is up. Serving that banner is the only thing the app uses the network for, and on first launch iOS shows the tracking permission (ATT) prompt. Choosing "Ask App Not to Track" keeps every feature working; you simply see non-personalized ads. A single "Remove Ads" purchase hides the banner for good (one-time, not a subscription). It unlocks no extra features, because nothing is locked.

YOUR ANSWERS STAY WITH YOU
No account is required. Answers, recordings and practice history are stored on your device only and are never sent to a developer server.

Note: scores come from rule-based on-device analysis, are for study support only, and do not guarantee real exam results. The interface is available in Korean, English, Japanese and Simplified Chinese; the questions, model answers and feedback are Korean-language study content.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| 완전판 해금 | $0.99 | one-time |
| Remove Ads | $0.99 | one-time |



## Version history (last 3 releases)

### 1.0.2 — 2026-08-02

Improvements and bug fixes.

### 1.0.1 — 2026-07-29

Bug fixes and stability improvements.

### 1.0 — 2026-07-28

No release notes.

## More apps by 丽佳 施

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- [Ember — Private Diary](https://appshunter.io/ios/app/ember-private-diary/id6769777961)

All apps by 丽佳 施: https://appshunter.io/developer/1894580777

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-12.*