# GCM DIALER vs RainbowCalc

The clearest difference is rating: GCM DIALER at 5.0 against RainbowCalc's 2.0. GCM DIALER also leads on ads (none vs shown) and monetization model (free vs ad-supported). RainbowCalc's advantage is update cadence (fortnightly vs monthly) and device support (3 vs 1). On price, ratings volume and in-app purchases there is nothing between them.

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

GCM DIALER holds the better App Store score, 5.0 against 2.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

GCM DIALER ships an update monthly, RainbowCalc fortnightly. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | GCM DIALER | RainbowCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/gcm-dialer/id1281520214/reviews)** | [2.0 (1 ratings)](https://appshunter.io/ios/app/rainbowcalc/id6479331134/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Fortnightly** |
| Monetization | **Free** | Ad-supported |
| Size | 60 MB | 34 MB |
| Requires iOS | 18.6 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [GCM TECH SOLUTIONS](https://appshunter.io/developer/1281520213) | [Andre Silva](https://appshunter.io/developer/1719182490) |

## What reviewers say

### GCM DIALER

[App page](https://appshunter.io/ios/app/gcm-dialer/id1281520214)

This communication app facilitates high-quality audio and video calls within closed groups. It offers features like audio conferencing for seamless group discussions.

**Highlights:** High-quality audio calling, Audio conferencing, Video calling, Closed group communication

**Features:** macOS Compatibility

**In-app purchases:** none


### RainbowCalc

[App page](https://appshunter.io/ios/app/rainbowcalc/id6479331134)

This calculator app offers extensive customization with a wide color picker for backgrounds and keys, enhancing usability and accessibility. It includes a calculation history with sharing options and supports basic arithmetic, percentages, and square roots.

**Highlights:** Customizable background and key colors, Advanced color picker, Calculation history, Share calculations, Basic operations, Percentage calculations, Square root calculations

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

**In-app purchases:** none


## Frequently asked questions

### Is GCM DIALER free?

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

### Is RainbowCalc free?

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

### Which has better reviews, GCM DIALER or RainbowCalc?

GCM DIALER is rated higher. GCM DIALER averages 5.0 out of 5 from 1 ratings, while RainbowCalc averages 2.0 from 1 ratings.

### Do GCM DIALER or RainbowCalc have ads?

RainbowCalc shows ads; GCM DIALER does not.

### Which is updated more often, GCM DIALER or RainbowCalc?

GCM DIALER ships an update monthly, and RainbowCalc fortnightly. Most recently, GCM DIALER was updated on October 29, 2026 and RainbowCalc on October 27, 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.*