# bcRPN vs echo

The clearest difference is price: bcRPN at Free against echo's $2.99. bcRPN also leads on device support (3 vs 1) and iOS requirement (15.0 vs 26.0). echo's advantage is update cadence (every 3 days vs every 22 months). On ads and in-app purchases there is nothing between them.

bcRPN is free to download; echo costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

bcRPN ships an update every 22 months, echo every 3 days. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | bcRPN | echo |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/bcrpn/id1614744829/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 3 days** |
| Monetization | Free | — |
| Size | 0 MB | 3 MB |
| Requires iOS | **15.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Paul Wilkins](https://appshunter.io/developer/1614739840) | [Arjun Mahanti](https://appshunter.io/developer/1028057606) |

## What reviewers say

### bcRPN

[App page](https://appshunter.io/ios/app/bcrpn/id1614744829)

This utility app functions as a Reverse Polish Notation calculator. It handles complex numbers and utilizes extended precision for all calculations, offering an unlimited stack depth and an undo feature for up to 10 operations.

**Highlights:** Reverse Polish Notation (RPN) input, Complex number calculations, Extended precision math, Unlimited stack depth, Undo functionality (up to 10 operations)

**Features:** macOS Compatibility

**In-app purchases:** none


### echo

[App page](https://appshunter.io/ios/app/echo-quick-notes/id6753983671)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is bcRPN free?

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

### Is echo free?

echo costs $2.99, with no in-app purchases.

### Do bcRPN or echo have ads?

Neither bcRPN nor echo shows ads.

### Which is updated more often, bcRPN or echo?

bcRPN ships an update every 22 months, and echo every 3 days. Most recently, bcRPN was updated on October 7, 2026 and echo on October 2, 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.*