Comparison

Hidden calc vs Smart Calc+

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

Head to head

Smart Calculator App

About

Hidden calc

Features

Read full description

Calculator that allows to hide input values and calculation results while using the app

About

Smart Calc+

Read full description

Your ultimate tool for basic algebra, trigonometry (sin, cos), logarithms (log), and more. Perform quick and accurate calculations with a built-in history log to keep track of all your calculations.

Screenshots

Hidden calc2 screens

Smart Calc+3 screens

Verdict

The call

The clearest difference is ads: Smart Calc+ at none against Hidden calc's shown. Smart Calc+ also leads on update cadence (every 3 days vs every 2 weeks) and iOS requirement (13.4 vs 15.8.3). On price, 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

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Hidden calc ships an update every 2 weeks, Smart Calc+ every 3 days. The most recent releases landed on October 10, 2026 and October 15, 2026 respectively.

Scorecard3 real differences · 3 level

Hidden calc versus Smart Calc+: the parameters behind the verdict, then further details
Parameter	Hidden calc	Smart Calc+
Price	Free	Free
Update frequency	Every 2 weeks	Every 3 days — better
Ads	Yes	No — better
In-app purchases	No	No
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	15.8.3	13.4 — better
Further details — not scored
Size	35 MB	22 MB
Age rating	4+	4+
Developer	Hideaki Uchikoshi	Rahman Usta

In-app purchases

None

Hidden calc

No in-app purchases

None

Smart Calc+

No in-app purchases

Questions

Is Hidden calc free?

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

Is Smart Calc+ free?

Smart Calc+ is free to download, with no in-app purchases.

Do Hidden calc or Smart Calc+ have ads?

Hidden calc shows ads; Smart Calc+ does not.

Which is updated more often, Hidden calc or Smart Calc+?

Hidden calc ships an update every 2 weeks, and Smart Calc+ every 3 days. Most recently, Hidden calc was updated on October 10, 2026 and Smart Calc+ on October 15, 2026.