Comparison

SwiftRPN vs Hidden calc

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

Head to head
About

SwiftRPN

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SwiftRPN is an RPN (Reverse Polish Notation) calculator that aims to be quick to open and easy to use. = RPN Stack Work quickly and efficiently using the RPN Stack by pushing and popping values. The stack will always show what series of inputs led to each output, so you won't lose context during complicated expressions. = Extended Types SwiftRPN can understand scalar types like integers and real numbers, as well as vectors and square matrices of sizes 2, 3, and 4. When operating purely in the scalar integer domain, SwiftRPN can promote up to BigInts to avoid floating point imprecision. = Operators SwiftRPN has 84 built-in operators with included documentation and examples. All the expected operators (basic arithmetic, exponents, logarithms) are present, as are: - Rounding functions (floor/ceil/trunc/round) - Unit conversions - Bitwise operations (and/or/not/xor/shift left/shift right) - Statistics (avg/min/max/sum/std dev/NPV) - Trigonometry (sin/cos/tan + arc/hyperbolic variants) - Vector operations (dot/cross/normalize/length/swizzle) - Matrix operations (identity/inverse/transpose + translation/scale/rotation matrix generators) = Unit Conversions SwiftRPN has 74 built-in units, and can convert between units within families, including: - Angle - Area - Colors (3 and 4 components) - Coordinate systems (2D and 3D) - Length - Mass - Storage (Base 10 [SI, 1000 bytes in a kb] and Base 2 [1024 bytes in a kb]) - Temperature - Time - Volume = Value Representation SwiftRPN recognizes values represented in binary, octal, decimal, and hexidecimal. You can: - Enter values in one representation, and convert them to another - See the result of bitwise operations in binary automatically - View vec3 and vec4 components (truncated) in hexidecimal when working with colors.

About

Hidden calc

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

Screenshots

SwiftRPN4 screens
Hidden calc2 screens

Verdict

The call

The clearest difference is ads: SwiftRPN at none against Hidden calc's shown. Hidden calc's advantage is update cadence (every 2 weeks vs every 14 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

SwiftRPN ships an update every 14 months, Hidden calc every 2 weeks. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

Scorecard3 real differences · 5 level
SwiftRPN versus Hidden calc: the parameters behind the verdict, then further details
ParameterSwiftRPNHidden calc
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 14 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.615.8.3 — better
Further details — not scored
Size3 MB35 MB
Age rating4+4+
DeveloperPatrick GelvinHideaki Uchikoshi

In-app purchases

None

SwiftRPN

No in-app purchases

None

Hidden calc

No in-app purchases

Questions

Is SwiftRPN free?
SwiftRPN 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 SwiftRPN or Hidden calc have ads?
Hidden calc shows ads; SwiftRPN does not.
Which is updated more often, SwiftRPN or Hidden calc?
SwiftRPN ships an update every 14 months, and Hidden calc every 2 weeks. Most recently, SwiftRPN was updated on October 24, 2026 and Hidden calc on October 10, 2026.

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