Simple Age Calculator vs ThetaCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Simple Age Calculator
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.
- Calculate age from date of birth
- Identify ages 16, 18, 21+
- Customizable age thresholds
- Quick age verification tool
- Supports iPhone and iPad
Read full descriptionHide full description
Enter a person's date of birth and instantly see their age in years. Also with handy icons indicating if they are 16, 18, 21 or over. You can customise the three ages. Perfect for use in bars, tattoo parlours or anywhere else where it is essential to check a person's age. Made by sfyfe.com
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
Read full descriptionHide full description
ThetaCalc is a RPN (Reverse Polish Notation) calculator which can be extended by functions and equations programmed by the user in JavaScript.
Screenshots
Verdict
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.
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; 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.
| Parameter | Simple Age Calculator | ThetaCalc |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 4.3 (4 ratings) |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 4 — better |
| Update frequency | Every 22 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.5 — better | 17.6 |
| Further details — not scored | ||
| Size | 1 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Scott Fyfe | Felix Stehli |
Customer experience
Simple Age Calculator
ThetaCalc
In-app purchases
Simple Age Calculator
No in-app purchases
ThetaCalc
No in-app purchases
Questions
Is Simple Age Calculator free?
Is ThetaCalc free?
Which has better reviews, Simple Age Calculator or ThetaCalc?
Do Simple Age Calculator or ThetaCalc have ads?
Which is updated more often, Simple Age Calculator or ThetaCalc?
Other comparisons
