n4Studies vs SELF U
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
n4Studies
This application simplifies sample size and study power calculations for various research designs. It offers tools for estimating population means and proportions, comparing groups, and analyzing different study types like case-control and randomized controlled trials. Results can be easily shared via email.
- Calculate sample size for infinite/finite populations
- Compare two population means/proportions
- Calculate sample size for various study designs
- Calculate study power for comparisons
- Calculate study power for various study designs
- Share results via email
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Ease to calculate the sample size with n4Studies. n4Studies makes it easy to calculate the sample size and the power of a study. It comes with ABSOLUTELY NO WARRANTY. However, It can help 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 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 • 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 • You can send a result via Email to your colleague
SELF U
This platform offers a comprehensive online learning experience with courses taught by experts across various subjects. Access lessons anytime, anywhere, and manage your learning journey conveniently. Enhance your skills and knowledge with a wide range of educational content.
- Anywhere, Anytime Learning
- Class Booking Management
- Full Coverage of Study Areas
- Expert and Famous Instructors
- Self-Development Courses
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SELF U is the best one-stop online classroom and the most innovative online learning platform which covers in all areas of study, taught by many experts and famous instructors. It is the easiest, fastest and the most convenient way for everyone to study online. - Anywhere, Anytime: The most rigorously intensive way to study and enhance yourself! With the most innovative features of SELF U, you can learn and manage your class booking without the limitation of time and place. Also, you can instantly access to SELF U anywhere and anytime. - Full coverage in all study areas! By using SELF U, you can learn all areas of study, from English Language, English for Entrance/Admission, English for University Examination to Self-development and other subjects, all concluded in this one-stop application. - Learn with expert and famous instructors! SELF U is the platform that you can learn full coverage subjects taught by expert and famous instructors, i.e. Kru P Nan Enconcept who has been teaching many students that became No.1 in every tests of Thailand.
Screenshots
Verdict
n4Studies and SELF U both sit at 5.0 stars, but that hides the real split: 100% of n4Studies's written reviews are positive against 41% of SELF U's. n4Studies also leads on in-app purchases (none vs 7) and chart position (#186 vs unranked). SELF U's advantage is price (Free vs $1.99) and update cadence (every 5 weeks vs every 4 months). On rating, ratings volume and ads 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
SELF U is free to download; n4Studies costs $1.99 up front. SELF U sells 7 one-off in-app purchases. n4Studies asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for n4Studies against 5.0 for SELF U. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 100% of n4Studies's written reviews are positive against 41% of SELF U's.
n4Studies ships an update every 4 months, SELF U every 5 weeks. The most recent releases landed on August 7, 2026 and June 11, 2026 respectively.
| Parameter | n4Studies | SELF U |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 5.0 (1 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews — better | 41.2% of reviews |
| Number of ratings | 1 | 1 |
| Update frequency | Every 4 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Best chart rank | #186 — better | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 8 MB | 120 MB |
| Age rating | 4+ | 4+ |
| Developer | Chetta Ngamjarus | XeerSoft Thailand Co,Ltd. |
Customer experience
n4Studies
SELF U
In-app purchases
n4Studies
No in-app purchases
SELF U
- Pack Read Around (Lesson 1-4)$64.99
- Advanced Vocab + Reading$119.99
- Advanced Vocab & Reading$119.99
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- Complete 5,000 Vocabularies$139.99
- Ultimate Writing ปี 2559$174.99
- Advanced Writing (เทอม 1/61)$209.99
- Advanced Admission (เทอม 1/60)$299.99
