Comparison

IsI Calculator vs Calclassic

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

Head to head

Classic calculator

About

IsI Calculator

Features

Read full description

This app offers a complete calculator with many well-known features for your everyday calculations required. functions: addition subtraction multiplication Division Percent account Potentiation high 2 and 3 Since Version 1.2 the app is now useable on Apple Watch.

About

Calclassic

Features

Read full description

It is a calculator that evokes nostalgia and respect each time you use it.

Screenshots

IsI Calculator2 screens

Calclassic2 screens

Verdict

The call

The clearest difference is device support: IsI Calculator at 4 against Calclassic's 2. IsI Calculator also leads on iOS requirement (9.0 vs 17.0). On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

IsI Calculator ships an update fortnightly, Calclassic every 9 days. The most recent releases landed on October 26, 2026 and October 27, 2026 respectively.

Scorecard2 real differences · 4 level

IsI Calculator versus Calclassic: the parameters behind the verdict, then further details
Parameter	IsI Calculator	Calclassic
Price	Free	Free
Update frequency	Fortnightly	Every 9 days — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPad, iPod, Apple Watch — better	iPhone, iPad
Requires iOS	9.0 — better	17.0
Further details — not scored
Size	15 MB	3 MB
Age rating	4+	4+
Developer	Dominic Barra	Yutaka Taketoshi

In-app purchases

None

IsI Calculator

No in-app purchases

None

Calclassic

No in-app purchases

Questions

Is IsI Calculator free?

IsI Calculator is free to download, with no in-app purchases.

Is Calclassic free?

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

Do IsI Calculator or Calclassic have ads?

Neither IsI Calculator nor Calclassic shows ads.

Which is updated more often, IsI Calculator or Calclassic?

IsI Calculator ships an update fortnightly, and Calclassic every 9 days. Most recently, IsI Calculator was updated on October 26, 2026 and Calclassic on October 27, 2026.