Comparison

UnitConverter byNSDev vs おたよりカレンダー

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

Head to head
About

UnitConverter byNSDev

This tool converts between 26 different types of units, displaying conversion rates and allowing you to specify decimal places. It supports a vast array of units across categories like length, mass, volume, and more.

Highlights
  • Converts 26 types of units
  • Displays conversion rates
  • Customizable decimal places
  • Supports numerous units in various categories
  • User-submitted unit requests
Features
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Tool to convert each of 26 types of units. When you select a unit of value that you enter, you create a table to calculate all the other units. It also displays the conversion rate. You can also specify the number of decimal places. 23 units in Length 18 units in Area 31 units in Volume 15 units in Mass 5 units in Angle 4 units in Temperature 7 units in Time 3 units in Frequency 5 units in Force 17 units in Pressure 6 units in Energy 6 units in Power rate 13 units in Speed 14 units in Acceleration 2 units in Dynamic viscosity 4 units in Kinematic viscosity 3 units in Magnetic flux density 2 units in Magnetic flux 7 units in Luminance 4 units in Illuminance 3 units in Radiation - source activity 2 units in Radiation - absorbed dose 2 units in Radiation - equivalent dose 2 units in Radiation - exposure 7 units in Infomation 7 units in Resolution Because we want to support units around the world, We will wait for the name and unit conversion information. Please enter your review.

About

おたよりカレンダー

Features
Read full description

Organize school newsletters with your camera. Just take a photo of a newsletter from school, nursery, or kindergarten — Otayori Calendar automatically extracts due dates and supplies, and puts them on your calendar. ■ Main features [Camera scan] Snap a photo and the app extracts due dates and supplies automatically. No typing needed. [Calendar view] See this month's and next month's school events at a glance in a monthly calendar. [Supplies checklist] On the morning of the event, open the app and check items off one by one. [Multiple children] Assign a color to each child so you can tell whose newsletter it is instantly. [Manual entry] Add a title, due date, and supplies by hand when a photo isn't practical. [Widgets] See upcoming due dates and supplies on your Home Screen and Lock Screen — without opening the app. ■ Privacy Photos and the text recognition run entirely on your device. Your photos are never sent anywhere. Data leaves your device only when you use these features: · Add to Google Calendar: the title, date, and supplies of the event you choose · Family sharing: delivered to the people you share with via iCloud · Ads: information required for ad delivery ■ Requirements iOS 17.0 or later / iPhone An in-app purchase is available to remove ads.

Screenshots

UnitConverter byNSDev3 screens
おたよりカレンダー4 screens

Verdict

The call

The clearest difference is review sentiment: おたよりカレンダー at 100% against UnitConverter byNSDev's 20%. おたよりカレンダー also leads on update cadence (every 3 days vs every 5 months). UnitConverter byNSDev's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price 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

Both are free to download. おたよりカレンダー sells 2 one-off in-app purchases. UnitConverter byNSDev asks for nothing beyond the download.

UpkeepUpdate frequency

UnitConverter byNSDev ships an update every 5 months, おたよりカレンダー every 3 days. The most recent releases landed on October 4, 2026 and October 10, 2026 respectively.

Scorecard6 real differences · 2 level
UnitConverter byNSDev versus おたよりカレンダー: the parameters behind the verdict, then further details
ParameterUnitConverter byNSDevおたよりカレンダー
PriceFreeFree
Positive reviews20.0% of reviews100.0% of reviews — better
Update frequencyEvery 5 monthsEvery 3 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better17.0
Further details — not scored
Size4 MB6 MB
Age rating4+4+
DeveloperNIHON SYSTEM DEVELOPER CORPORATIONKUREHO

Customer experience

UnitConverter byNSDev

Written reviews20 reviews
Positive20.0%
Neutral35.0%
Negative45.0%

おたよりカレンダー

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

UnitConverter byNSDev

No in-app purchases

2 purchases

おたよりカレンダー

One-time2
  • Remove Ads$1.99
  • Plus$9.99

Questions

Is UnitConverter byNSDev free?
UnitConverter byNSDev is free to download, with no in-app purchases.
Is おたよりカレンダー free?
おたよりカレンダー is free to download, with in-app purchases available.
Do UnitConverter byNSDev or おたよりカレンダー have ads?
おたよりカレンダー shows ads; UnitConverter byNSDev does not.
Which is updated more often, UnitConverter byNSDev or おたよりカレンダー?
UnitConverter byNSDev ships an update every 5 months, and おたよりカレンダー every 3 days. Most recently, UnitConverter byNSDev was updated on October 4, 2026 and おたよりカレンダー on October 10, 2026.

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