REXX vs n4Studies Plus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
REXX
This platform collects and analyzes student learning data, progress, and evaluations for health science training programs. It offers features for inputting learning information, submitting work, and receiving qualitative and quantitative feedback from supervisors.
- Learning record input and progress tracking
- Formative feedback provision
- Submit work via scanning
- Submit work via sending
- Qualitative and quantitative evaluation
- Data analysis and visualization
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REXX is a “Data Intelligence Platform for Health Science Training Program” which facilitates the data collection of student learning records, progress and evaluation. Also, REXX will analyze and visualize the recorded data to support any data utilization activity along their programs. Main Features on REXX Mobile Application Learning Record: Easily input learning information. Check the progress. Also find the formative feedback. Submit by Scanning: A submit method when the supervision is needed. Submit by Sending: Convenient when delivering work over a long distance. Evaluation: Qualitative and quantitative validation from supervisor.
n4Studies Plus
This app simplifies sample size and study power calculations for various research designs. It offers tools for regression, survival analysis, diagnostic studies, and more, helping users find calculations in minutes.
- Sample size calculation for regression
- Sample size for survival analysis
- Sample size for diagnostic and cross-over studies
- Sample size for population means and proportions
- Sample size for case-control and cohort studies
- Study power calculations
- Email output sharing
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Ease to calculate the sample size with n4Studies Plus. n4Studies Plus makes it easy to calculate the sample size and the power of a study in various study designs. It comes with ABSOLUTELY NO WARRANTY. However, It can be helped to learn and find the ways to calculate the sample size and power of the study in minutes. Key features: • Calculate the sample size for simple and multiple linear regression, logistic regression • Calculate the sample size for survival analysis e.g. compare 2 survival curves, compare for equality between 2 hazard rates etc. • Calculate the sample size for diagnostic study, cross-over study • Calculate the sample size for estimating an infinite population mean, finite population mean, infinite population proportion and finite population proportion • Calculate the sample size for comparing two population means and two population proportions • Calculate the sample size for the Case-Control for study, Matched Case-Control study, Cohort study, Randomized Controlled Trial, Non-inferiority trial and Equivalence trial • Calculate the power of a study for comparing two population means and two population proportions • Calculate the power of a study for the Case-Control for study, Matched Case-Control study, Cohort study, Randomized Controlled Trial, Non-inferiority trial and Equivalence trial • Sample size and power calculations for measures of Agreement (both Kappa statistic and Intraclass correlation coefficients) • You can send a output via Email to your colleagues
Screenshots
Verdict
The clearest difference is price: REXX at Free against n4Studies Plus's $7.99. REXX also leads on review sentiment (13% vs 0%) and device support (3 vs 1). On update cadence, ads and in-app purchases 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
REXX is free to download; n4Studies Plus costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.
REXX ships an update monthly, n4Studies Plus every 2 months. The most recent releases landed on June 10, 2026 and September 15, 2026 respectively.
| Parameter | REXX | n4Studies Plus |
|---|---|---|
| Price | Free — better | $7.99 |
| Rating | — | 3.0 (1 ratings) — better |
| Positive reviews | 12.5% of reviews — better | 0.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Monthly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12 — better | 16.0 |
| Further details — not scored | ||
| Size | 62 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | VERNITY COMPANY LIMITED | Chetta Ngamjarus |
Customer experience
REXX
n4Studies Plus
In-app purchases
REXX
No in-app purchases
n4Studies Plus
No in-app purchases







