Comparison

ThetaCalc vs Hidden calc

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

Head to head

ThetaCalc

Free

🔧 Utilities

★ 4.34 ratingsView app →

About

ThetaCalc

This utility app provides a Reverse Polish Notation (RPN) calculator. Users can extend its functionality by programming custom functions and equations using JavaScript.

Highlights

Reverse Polish Notation (RPN) calculator
User-programmable functions
JavaScript equation support
Extensible functionality

Features

Read full description

ThetaCalc is a RPN (Reverse Polish Notation) calculator which can be extended by functions and equations programmed by the user in JavaScript.

About

Hidden calc

Features

Read full description

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

Screenshots

ThetaCalc4 screens

Hidden calc2 screens

Verdict

The call

The clearest difference is ads: ThetaCalc at none against Hidden calc's shown. Hidden calc's advantage is update cadence (every 2 weeks vs every 3 months) and iOS requirement (15.8.3 vs 17.6). 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

ThetaCalc ships an update every 3 months, Hidden calc every 2 weeks. The most recent releases landed on October 29, 2026 and October 10, 2026 respectively.

Scorecard3 real differences · 7 level

ThetaCalc versus Hidden calc: the parameters behind the verdict, then further details
Parameter	ThetaCalc	Hidden calc
Price	Free	Free
Rating	4.3 (4 ratings) — better	—
Positive reviews	100.0% of reviews	—
Number of ratings	4 — better	—
Update frequency	Every 3 months	Every 2 weeks — better
Ads	No — better	Yes
In-app purchases	No	No
Monetization	Free	—
Devices	iPhone, iPad	iPhone, iPad, iPod — better
Requires iOS	17.6	15.8.3 — better
Further details — not scored
Size	1 MB	35 MB
Age rating	4+	4+
Developer	Felix Stehli	Hideaki Uchikoshi

In-app purchases

None

ThetaCalc

No in-app purchases

None

Hidden calc

No in-app purchases

Questions

Is ThetaCalc free?

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

Is Hidden calc free?

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

Do ThetaCalc or Hidden calc have ads?

Hidden calc shows ads; ThetaCalc does not.

Which is updated more often, ThetaCalc or Hidden calc?

ThetaCalc ships an update every 3 months, and Hidden calc every 2 weeks. Most recently, ThetaCalc was updated on October 29, 2026 and Hidden calc on October 10, 2026.