# Complex RPN Calculator vs LabTimer

Complex RPN Calculator and LabTimer both sit at 3.8 stars, but that hides the real split: 91% of LabTimer's written reviews are positive against 52% of Complex RPN Calculator's. LabTimer also leads on ratings volume (174 vs 22) and iOS requirement (10.0 vs 16.4). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

LabTimer holds the better App Store score, 4.0 against 3.8. That said, the two scores are not equally well evidenced: LabTimer has 174 ratings behind it against 22, so its average is the more settled of the two. Written reviews point the same way: 52% of Complex RPN Calculator's written reviews are positive against 91% of LabTimer's.

Complex RPN Calculator ships an update every 5 months, LabTimer every 11 months. The most recent releases landed on August 23, 2026 and August 26, 2026 respectively.

## The numbers

| Metric | Complex RPN Calculator | LabTimer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (22 ratings)](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330/reviews) | **[4.0 (174 ratings)](https://appshunter.io/ios/app/labtimer/id292202454/reviews)** |
| Number of ratings | 22 | **174** |
| Positive reviews | 51.7% of reviews | **90.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 11 months |
| Monetization | Free | Free |
| Size | 1 MB | 1 MB |
| Requires iOS | 16.4 | **10.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [John Coddington](https://appshunter.io/developer/291826333) | [0x0c](https://appshunter.io/developer/292202457) |

## What reviewers say

### Complex RPN Calculator

[App page](https://appshunter.io/ios/app/complex-rpn-calculator/id291826330)

This scientific calculator utilizes a four-level stack and natively handles complex numbers. It allows users to input and view numbers in both polar and rectangular formats, remembering its state and offering 10 memory locations.

**Highlights:** Complex number support, Four-level stack, Polar and rectangular formats, State persistence, 10 memory locations, Scientific calculations

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- ✅ Great RPN functionality
- ✨ Complex number support
- 🆓 Free to use
- 🚫 No ads or in-app purchases
- 💻 Works on macOS

**What reviewers complain about**

- 🎨 SwiftUI design is ugly
- 🐌 Slow keyboard response
- 🖱️ Clunky operation
- 📉 Complex number operations limited
- ⚠️ Broken on newer iOS versions (historically)

**Reported bugs**

- Mutes other apps when used
- Slow keyboard response after update
- X^3 calculation incorrect for large imaginary numbers
- App crashes on opening/button press (historical iOS 9 issues)
- App starts upside down in landscape on iPad (historical iOS 8 issue)

**Requested features**

- Turn off key click sound
- Customize number display
- See the stack
- Fix slow entry response
- Fix imaginary number calculation (X^3)


### LabTimer

[App page](https://appshunter.io/ios/app/labtimer/id292202454)

This app provides multiple configurable timers for various uses, from scientific experiments to everyday tasks like cooking and workouts. It features a clear display, customizable labels, and the ability to repeat count-down timers.

**Highlights:** Four configurable timers, Count-up and count-down modes, Large display and buttons, Customizable text labels, Repeat count-down functionality, Disables iPod sleep

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Simple, clean, and intuitive user interface
- 🎯 Multiple timers (up to 16) running simultaneously
- ⏱️ Ability to count up and count down
- 🔄 Timers continue running in background/other apps
- 💾 Saves timer settings for future use

**What reviewers complain about**

- 🐛 Notifications not working properly on iPad
- 🐛 App crashes or won't open on some iOS versions
- 🐛 Alarm doesn't work when app is locked/in background
- 📱 No landscape/auto-rotate orientation support
- 🔊 Alarm sound too short and soft

**Reported bugs**

- iPad notifications not displaying correctly
- App fails to open on iPhone X with iOS 14.4
- Alarm non-functional on iOS 5 in lock mode
- No audio output on iOS 9.x
- Timer stops when iPhone enters sleep mode (older versions)

**Requested features**

- Landscape orientation support (especially for iPad)
- Keyboard/direct number input for faster time entry
- Multiple selectable alarm sounds/tones
- Ability to customize alarm volume independently
- Countdown voice announcements


## Frequently asked questions

### Is Complex RPN Calculator free?

Complex RPN Calculator is free to download, with no in-app purchases.

### Is LabTimer free?

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

### Which has better reviews, Complex RPN Calculator or LabTimer?

LabTimer is rated higher. Complex RPN Calculator averages 3.8 out of 5 from 22 ratings, while LabTimer averages 4.0 from 174 ratings.

### Do Complex RPN Calculator or LabTimer have ads?

Neither Complex RPN Calculator nor LabTimer shows ads.

### Which is updated more often, Complex RPN Calculator or LabTimer?

Complex RPN Calculator ships an update every 5 months, and LabTimer every 11 months. Most recently, Complex RPN Calculator was updated on August 23, 2026 and LabTimer on August 26, 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.*