Comparison

ContactFlow vs Standard Deviation

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

Head to head
About

ContactFlow

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
Read full description

ContactFlow for iOS will help you rediscover your contacts. Just tap on a contact to display all associated informations. Features : • Apple Watch App • Photo Wall View • Contacts map • List View • Birthdays Widget • Birthday notifications • Source/Group selection • Universal application Official website of ContactFlow http://www.contactflow.fr

About

Standard Deviation

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
Read full description

SD calculator is an iOS application developed for the calculation of standard deviation problems. It includes entering data values and selecting the type of standard deviation i.e. sample or population. Features of standard deviation calculator Design The design of this application is unique and its style and theme are attractive. This app is designed to top all the other apps out there in the design department. Input field The input field is easy to use to enter data and get the result. Simply, add the comma-separated values and choose the type of standard deviation. Multiple options There are multiple options available in this application as you can get the mean, sample standard deviation, population standard deviation, deviation (difference of data values from the mean), square of deviation, sample variance, and population variance. Results The step-by-step solution will be provided just after hitting the calculate button for the sample and population data. This will help you to ease up the lengthy and time-consuming calculation in a fraction of a second. How to use a standard deviation calculator? This application is easy to use, but just in case you need a guide, here it is. • First of all, enter the comma-separated values into the input box. • Select the type of the standard deviation i.e. sample or population. • Press the calculate button. • The step-by-step result will show just after pressing the calculate button • Hit the reset button to enter new data.

Screenshots

ContactFlow4 screens
Standard Deviation4 screens

Verdict

The call

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.

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

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
ContactFlow versus Standard Deviation: the parameters behind the verdict, then further details
ParameterContactFlowStandard Deviation
Price$0.99Free — better
Rating5.0 (2 ratings) — better1.0 (1 ratings)
Positive reviews58.8% of reviews—
Number of ratings2 — better1
Update frequencyEvery 18 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod, Mac — better
Requires iOS17.013.0 — better
Further details — not scored
Size5 MB21 MB
Age rating4+4+
DeveloperFabien FOULONAhmad Sattar

In-app purchases

None

ContactFlow

No in-app purchases

None

Standard Deviation

No in-app purchases

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.

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