# ContactFlow vs Standard Deviation

The clearest difference is price: Standard Deviation at Free against ContactFlow's $0.99. Standard Deviation also leads on update cadence (every 2 months vs every 18 months) and iOS requirement (13.0 vs 17.0). ContactFlow's advantage is rating (5.0 vs 1.0). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Standard Deviation is free to download; ContactFlow costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ContactFlow holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

ContactFlow ships an update every 18 months, Standard Deviation every 2 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | ContactFlow | Standard Deviation |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/contactflow/id931378221/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/standard-deviation-calculator/id6444146244/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 58.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 18 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 5 MB | 21 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Fabien FOULON](https://appshunter.io/developer/296570792) | [Ahmad Sattar](https://appshunter.io/developer/1458483953) |

## What reviewers say

### ContactFlow

[App page](https://appshunter.io/ios/app/contactflow/id931378221)

This utility app offers a new way to view and manage your contacts. It provides a photo wall, map view, and birthday notifications to help you rediscover your connections. Available on iPhone, iPad, and Apple Watch.

**Highlights:** Apple Watch App, Photo Wall View, Contacts Map, Birthday Notifications, Birthdays Widget, Universal Application

**Features:** macOS Compatibility

**In-app purchases:** none


### Standard Deviation

[App page](https://appshunter.io/ios/app/standard-deviation-calculator/id6444146244)

Easily calculate standard deviation with this iOS app. Enter your data values, choose between sample or population calculations, and get step-by-step results instantly. It offers a unique and attractive design for a seamless user experience.

**Highlights:** Calculate sample and population standard deviation, Enter comma-separated data values, View step-by-step solutions, Calculate mean, deviation, and variance, Unique and attractive design, Reset function for new data

**In-app purchases:** none


## Frequently asked questions

### Is ContactFlow free?

ContactFlow costs $0.99, with no in-app purchases.

### Is Standard Deviation free?

Standard Deviation is free to download, with no in-app purchases.

### Which has better reviews, ContactFlow or Standard Deviation?

ContactFlow is rated higher. ContactFlow averages 5.0 out of 5 from 2 ratings, while Standard Deviation averages 1.0 from 1 ratings.

### Do ContactFlow or Standard Deviation have ads?

Neither ContactFlow nor Standard Deviation shows ads.

### Which is updated more often, ContactFlow or Standard Deviation?

ContactFlow ships an update every 18 months, and Standard Deviation every 2 months. Most recently, ContactFlow was updated on November 1, 2026 and Standard Deviation on November 3, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*