iSurvey vs NexSample
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iSurvey
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Survey Application for Synbiotix clients
NexSample
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NexSample is a free sample size calculator for clinical research, designed for medical residents, fellows, postgraduate students, and researchers. It includes 26 calculators covering the most common study designs in clinical trials, observational research, and diagnostic studies, along with calculators for agreement, reliability, and regression that are hard to find elsewhere. Whether you are planning a thesis, protocol, dissertation, grant proposal, or manuscript, NexSample helps you calculate sample size quickly and accurately, with full formulas and references shown for every calculation.
Screenshots
Verdict
The clearest difference is update cadence: NexSample at weekly against iSurvey's every 3 months. iSurvey's advantage is iOS requirement (9.3 vs 15.1). On price, ads, in-app purchases and device support 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
iSurvey ships an update every 3 months, NexSample weekly. The most recent releases landed on September 13, 2026 and September 22, 2026 respectively.
| Parameter | iSurvey | NexSample |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 9.3 — better | 15.1 |
| Further details — not scored | ||
| Size | 31 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Synbiotix Ltd | M Jeeva Sankar |
In-app purchases
iSurvey
No in-app purchases
NexSample
No in-app purchases
