Comparison

UnitConverter byNSDev vs Instructions

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
Read full description

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

Instructions

Features
Read full description

Key Features - Register, save, search, and share PDFs - Import PDFs shared from other apps - Organize PDFs into categories - No account required - Supports web page registration - Simple and intuitive interface Keep manuals and technical documents at your fingertips—offline! This app lets you register and manage PDF manuals and reference materials so you can search and read them anytime, even without an internet connection. You can also bookmark websites for quick online access when needed. Perfect for professionals and tech users who want to organize manuals, guides, and documentation in one place—and stay productive, even when offline.

Screenshots

UnitConverter byNSDev3 screens
Instructions4 screens

Verdict

The call

The clearest difference is in-app purchases: UnitConverter byNSDev at none against Instructions's 1. UnitConverter byNSDev also leads on ads (none vs shown). Instructions's advantage is update cadence (fortnightly vs every 5 months). On price, device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Instructions sells 1 one-off in-app purchase. UnitConverter byNSDev asks for nothing beyond the download.

UpkeepUpdate frequency

UnitConverter byNSDev ships an update every 5 months, Instructions fortnightly. The most recent releases landed on October 29, 2026 and October 30, 2026 respectively.

Scorecard3 real differences · 5 level
UnitConverter byNSDev versus Instructions: the parameters behind the verdict, then further details
ParameterUnitConverter byNSDevInstructions
PriceFreeFree
Positive reviews20.0% of reviews—
Update frequencyEvery 5 monthsFortnightly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size4 MB15 MB
Age rating4+17+
DeveloperNIHON SYSTEM DEVELOPER CORPORATIONKazuhisa Kobayashi

In-app purchases

None

UnitConverter byNSDev

No in-app purchases

1 purchases

Instructions

One-time1
  • Remove Ads$4.99

Questions

Is UnitConverter byNSDev free?
UnitConverter byNSDev is free to download, with no in-app purchases.
Is Instructions free?
Instructions is free to download, with in-app purchases available.
Do UnitConverter byNSDev or Instructions have ads?
Instructions shows ads; UnitConverter byNSDev does not.
Which is updated more often, UnitConverter byNSDev or Instructions?
UnitConverter byNSDev ships an update every 5 months, and Instructions fortnightly. Most recently, UnitConverter byNSDev was updated on October 29, 2026 and Instructions on October 30, 2026.

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