Comparison

REXX vs n4Studies Plus

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

REXX4 screens
n4Studies Plus4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

REXX ships an update monthly, n4Studies Plus every 2 months. The most recent releases landed on June 10, 2026 and September 15, 2026 respectively.

Scorecard5 real differences · 5 level
REXX versus n4Studies Plus: the parameters behind the verdict, then further details
ParameterREXXn4Studies Plus
PriceFree — better$7.99
Rating—3.0 (1 ratings) — better
Positive reviews12.5% of reviews — better0.0% of reviews
Number of ratings—1 — better
Update frequencyMonthly — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS12 — better16.0
Further details — not scored
Size62 MB16 MB
Age rating4+4+
DeveloperVERNITY COMPANY LIMITEDChetta Ngamjarus

Customer experience

REXX

Written reviews8 reviews
Positive12.5%
Neutral0.0%
Negative87.5%

n4Studies Plus

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral100.0%
Negative0.0%

In-app purchases

None

REXX

No in-app purchases

None

n4Studies Plus

No in-app purchases

Questions

Is REXX free?
REXX is free to download, with no in-app purchases.
Is n4Studies Plus free?
n4Studies Plus costs $7.99, with no in-app purchases.
Do REXX or n4Studies Plus have ads?
Neither REXX nor n4Studies Plus shows ads.
Which is updated more often, REXX or n4Studies Plus?
REXX ships an update monthly, and n4Studies Plus every 2 months. Most recently, REXX was updated on June 10, 2026 and n4Studies Plus on September 15, 2026.

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