Universal Converter. vs ThetaCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Universal Converter.
This utility app provides a comprehensive conversion calculator for a vast array of units across 64 categories. It offers automatic calculations based on input changes and supports regional decimal separators for ease of use.
- 64 conversion categories
- 1333 units supported
- Automatic value calculation
- Supports regional decimal separators
- Simple and easy to use interface
- Engineering and educational utility
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Universal Converter is a conversion calculator that can quickly and easy translate different units of measure. It consists of 64 Categories with 1333 Units and 53742 Conversions. 1.Acceleration 2.Angle 3.Area 4.Astronomy 5.Brix & Baume Degrees 6.Charge Converter 7.Charge Density (Linear) 8.Charge Density (Surface) 9.Charge Density (Volume) 10.Color Finder11. 11.Cooking 12.Current 13.Current Density (Linear) 14.Current Density (Surface) 15.Data Transfer 16.Density 17.Electrical Capacitance 18.Electrical Conductance 19.Electrical Conductivity 20.Electrical Field Strength 21.Electrical Inductance 22.Electrical Resistance 23.Electrical Resistivity 24.Electric Potential 25.Energy/Work 26.Flow Rate (Mass) 27.Flow Rate (Volume) 28.Fluid 29.Force 30.Frequency 31.Fuel Consumption 32.Hardness 33.Length 34.Light (Illuminance) 35.Light (Luminance) 36.Magnetic Flux 37.Mass 38.Memory (Computer) 39.Metric Weight 40.Metrology 41.Moment of Force 42.Moment of Inertia 43.Money Counter 44.Percentage 45.Permeability 46.Power 47.Prefixes 48.Pressure 49.Radiation 50.Roman Number 51.Sound 52.Specific Heat Capacity 53.Specific Volume 54.Temperature 55.Thermal Conductivity 56.Thermal Expansion 57.Time 58.Torque 59.Typography 60.Velocity 61.Viscosity (Dynamic) 62.Viscosity (Oil & Water) 63.Viscosity (Kinematic) 64.Volume Key Features: Automatic calculation of values is done based on; changes in input values changes in input units changes in output units - Can use either ( . ) dot or ( , ) comma as decimal separator, based on regional settings of the device. - Easy and Very Simple to Use. - A Complete Engineering & Educational Utility
ThetaCalc
This utility app provides a Reverse Polish Notation (RPN) calculator. Users can extend its functionality by programming custom functions and equations using JavaScript.
- Reverse Polish Notation (RPN) calculator
- User-programmable functions
- JavaScript equation support
- Extensible functionality
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ThetaCalc is a RPN (Reverse Polish Notation) calculator which can be extended by functions and equations programmed by the user in JavaScript.
Screenshots
Verdict
Universal Converter. and ThetaCalc both sit at 4.3 stars, but that hides the real split: 100% of ThetaCalc's written reviews are positive against 0% of Universal Converter.'s. ThetaCalc also leads on price (Free vs $4.99) and update cadence (every 3 months vs every 24 months). Universal Converter.'s advantage is ratings volume (12 vs 4). On rating, ads, 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
ThetaCalc is free to download; Universal Converter. costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 4.3 for Universal Converter. against 4.3 for ThetaCalc. Both are backed by a comparable volume of ratings — 12 and 4 respectively. Written reviews are what separate them: 0% of Universal Converter.'s written reviews are positive against 100% of ThetaCalc's.
Universal Converter. ships an update every 24 months, ThetaCalc every 3 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | Universal Converter. | ThetaCalc |
|---|---|---|
| Price | $4.99 | Free — better |
| Rating | 4.3 (12 ratings) — better | 4.3 (4 ratings) |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 12 — better | 4 |
| Update frequency | Every 24 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 5 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | V PUGAZHENTHI | Felix Stehli |
Customer experience
Universal Converter.
ThetaCalc
In-app purchases
Universal Converter.
No in-app purchases
ThetaCalc
No in-app purchases
