PsyPad vs Standard Deviation Calc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PsyPad
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PsyPad is an open source platform for facilitating visual psychophysics experiments on an iPad. Using customisable staircases or MOCS, the researcher can control presentation of any stimuli that can be precomputed as PNG image files, including movies. Features include participant accounts, up to 4 response buttons, comprehensive log files, and remote test configuration using the PsyPad server. A demo mode with access to a public gallery of tests also makes PsyPad useful for teaching. The project is open source, with repositories for the application code and example server code. https://github.com/davidlawson/PsyPad https://github.com/davidlawson/PsyPad-Server
Standard Deviation Calc
Calculate standard deviation for sample or population data. Input numerical values to find standard deviation, count, sum, mean, variance, and more. Get quick statistical insights with this easy-to-use tool.
- Calculate standard deviation
- Sample or population data
- Compute mean and variance
- Count numerical values
- Sum of numbers
- List of differences
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Use this app to calculate standard deviation for a population or sample data set. Enter your numerical values, and the app will instantly calculate standard deviation, variance, mean, count, sum, and other supporting statistics. Results are estimates for informational purposes only. We are very happy to serve you. If you have any requests, don't hesitate to contact us. - https://www.facebook.com/phan.nhatdang.3/ - phannhatd@gmail.com
Screenshots
Verdict
The clearest difference is in-app purchases: PsyPad at none against Standard Deviation Calc's 1. Standard Deviation Calc's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement 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. Standard Deviation Calc sells 1 one-off in-app purchase. PsyPad asks for nothing beyond the download.
PsyPad ships an update every 4 months, Standard Deviation Calc every 5 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | PsyPad | Standard Deviation Calc |
|---|---|---|
| Price | Free | Free |
| Rating | — | 3.8 (12 ratings) — better |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | — | 12 — better |
| Update frequency | Every 4 months — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 13.5 — better | 14.0 |
| Further details — not scored | ||
| Size | 4 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrew Turpin | Phan Nhat Đang |
In-app purchases
PsyPad
No in-app purchases
Standard Deviation Calc
- Remove ads$1.99
Questions
Is PsyPad free?
Is Standard Deviation Calc free?
Do PsyPad or Standard Deviation Calc have ads?
Which is updated more often, PsyPad or Standard Deviation Calc?
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