# Phonal Tonal vs Flex Calculators

The clearest difference is price: Flex Calculators at Free against Phonal Tonal's $0.99. Flex Calculators also leads on update cadence (every 10 days vs every 11 months). Phonal Tonal's advantage is in-app purchases (none vs 1). On ads, device support and iOS requirement there is nothing between them.

Flex Calculators is free to download; Phonal Tonal costs $0.99 up front. Flex Calculators sells 1 one-off in-app purchase. Phonal Tonal asks for nothing beyond the download.

Phonal Tonal ships an update every 11 months, Flex Calculators every 10 days. The most recent releases landed on November 10, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Phonal Tonal | Flex Calculators |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.8 (23 ratings)](https://appshunter.io/ios/app/phonal-tonal/id344326827/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 83.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 10 days** |
| Monetization | Paid | — |
| Size | 3 MB | 37 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Kelvin Sherlock](https://appshunter.io/developer/293876735) | [An Le](https://appshunter.io/developer/1863975090) |

## What reviewers say

### Phonal Tonal

[App page](https://appshunter.io/ios/app/phonal-tonal/id344326827)

Explore the history of phone phreaking with this app. It generates classic phone tones like Blue Box and Red Box for nostalgic, fun, or educational experiences. Discover a variety of tones used in the past.

**Highlights:** Generates historical phone tones, Includes Blue Box, Red Box, Green Box tones, Supports Special Information Tones, DTMF tone generation, Nostalgic and educational purposes

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

**In-app purchases:** none


### Flex Calculators

[App page](https://appshunter.io/ios/app/flex-calculators/id6761326502)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is Phonal Tonal free?

Phonal Tonal costs $0.99, with no in-app purchases.

### Is Flex Calculators free?

Flex Calculators is free to download, with in-app purchases available.

### Do Phonal Tonal or Flex Calculators have ads?

Neither Phonal Tonal nor Flex Calculators shows ads.

### Which is updated more often, Phonal Tonal or Flex Calculators?

Phonal Tonal ships an update every 11 months, and Flex Calculators every 10 days. Most recently, Phonal Tonal was updated on November 10, 2026 and Flex Calculators on November 5, 2026.

---

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