# Simple Age Calculator vs ThetaCalc

The clearest difference is price: ThetaCalc at Free against Simple Age Calculator's $0.99. ThetaCalc also leads on update cadence (every 3 months vs every 22 months) and ratings volume (4 vs 1). Simple Age Calculator's advantage is rating (5.0 vs 4.3). On review sentiment, ads, in-app purchases and device support there is nothing between them.

ThetaCalc is free to download; Simple Age Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Simple Age Calculator holds the better App Store score, 5.0 against 4.3. Both are backed by a comparable volume of ratings — 1 and 4 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Simple Age Calculator ships an update every 22 months, ThetaCalc every 3 months. The most recent releases landed on October 8, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | Simple Age Calculator | ThetaCalc |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/simple-age-calculator/id829285271/reviews)** | [4.3 (4 ratings)](https://appshunter.io/ios/app/thetacalc/id1521614636/reviews) |
| Number of ratings | 1 | **4** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Size | 1 MB | 1 MB |
| Requires iOS | **17.5** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Scott Fyfe](https://appshunter.io/developer/829285274) | [Felix Stehli](https://appshunter.io/developer/1521614638) |

## What reviewers say

### Simple Age Calculator

[App page](https://appshunter.io/ios/app/simple-age-calculator/id829285271)

Instantly calculate a person's age in years by entering their date of birth. The app also features customizable icons to quickly identify if someone is 16, 18, 21, or older, making it ideal for age verification.

**Highlights:** Calculate age from date of birth, Identify ages 16, 18, 21+, Customizable age thresholds, Quick age verification tool, Supports iPhone and iPad

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### ThetaCalc

[App page](https://appshunter.io/ios/app/thetacalc/id1521614636)

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:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Simple Age Calculator free?

Simple Age Calculator costs $0.99, with no in-app purchases.

### Is ThetaCalc free?

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

### Which has better reviews, Simple Age Calculator or ThetaCalc?

Simple Age Calculator is rated higher. Simple Age Calculator averages 5.0 out of 5 from 1 ratings, while ThetaCalc averages 4.3 from 4 ratings.

### Do Simple Age Calculator or ThetaCalc have ads?

Neither Simple Age Calculator nor ThetaCalc shows ads.

### Which is updated more often, Simple Age Calculator or ThetaCalc?

Simple Age Calculator ships an update every 22 months, and ThetaCalc every 3 months. Most recently, Simple Age Calculator was updated on October 8, 2026 and ThetaCalc on October 1, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*