# Flex Metronome vs DrPhos' Ionic Compounds

The clearest difference is price: Flex Metronome at Free against DrPhos' Ionic Compounds's $0.99. Flex Metronome also leads on iOS requirement (14.0 vs 17.0). DrPhos' Ionic Compounds's advantage is update cadence (every 3 weeks vs every 3 months) and ratings volume (8 vs 1). On rating, review sentiment, ads and in-app purchases there is nothing between them.

Flex Metronome is free to download; DrPhos' Ionic Compounds costs $0.99 up front. Flex Metronome sells 2 in-app purchases, starting at $0.99 per month and DrPhos' Ionic Compounds sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for Flex Metronome against 4.9 for DrPhos' Ionic Compounds. That said, the two scores are not equally well evidenced: DrPhos' Ionic Compounds has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Flex Metronome ships an update every 3 months, DrPhos' Ionic Compounds every 3 weeks. The most recent releases landed on November 11, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Flex Metronome | DrPhos' Ionic Compounds |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flex-metronome/id1438005944/reviews)** | [4.9 (8 ratings)](https://appshunter.io/ios/app/drphos-ionic-compounds/id6473097401/reviews) |
| Number of ratings | 1 | **8** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 5 MB | 15 MB |
| Requires iOS | **14.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [YASUHIRO SEKINE](https://appshunter.io/developer/1438005943) | [Monte L Helm](https://appshunter.io/developer/1715082616) |

## What reviewers say

### Flex Metronome

[App page](https://appshunter.io/ios/app/flex-metronome/id1438005944)

Create complex rhythm patterns like polyrhythms, swing, and ethnic grooves with this intuitive metronome app. Save your custom creations and utilize a library of editable presets for your musical needs.

**Highlights:** Create polyrhythms, Implement swing rhythms, Design ethnic grooves, Support odd time signatures, Save custom patterns, Edit preset rhythms

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $0.99 | per month |
| Premium Yearly | $9.99 | per year |


### DrPhos' Ionic Compounds

[App page](https://appshunter.io/ios/app/drphos-ionic-compounds/id6473097401)

This app helps students learn and practice forming correct chemical formulas for ionic compounds. It supports a wide range of ions, including polyatomic ones, and dynamically generates formulas with proper subscripts and parentheses. It's designed to reinforce naming rules and charge balancing through an interactive interface.

**Highlights:** Extensive cation and anion list, Support for polyatomic ions, Real-time formula generation, Subscript and parenthesis formatting, Reinforces naming rules, Charge balancing practice

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ionic Compound Builder | Free | one-time |
| Science Calculator | $0.99 | one-time |
| Significant Figures Counter | $0.99 | one-time |
| Quadratic Equation Solver | $0.99 | one-time |
| Kinetics | $0.99 | one-time |
| Naming Compounds | $0.99 | one-time |
| Reaction Balancer | $0.99 | one-time |
| Stoichiometry | $0.99 | one-time |
| Solution Concentrations | $0.99 | one-time |
| pH Calculator | $0.99 | one-time |


## Frequently asked questions

### Is Flex Metronome free?

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

### Is DrPhos' Ionic Compounds free?

DrPhos' Ionic Compounds costs $0.99, and also offers in-app purchases.

### Which has better reviews, Flex Metronome or DrPhos' Ionic Compounds?

Flex Metronome is rated higher. Flex Metronome averages 5.0 out of 5 from 1 ratings, while DrPhos' Ionic Compounds averages 4.9 from 8 ratings.

### Do Flex Metronome or DrPhos' Ionic Compounds have ads?

Neither Flex Metronome nor DrPhos' Ionic Compounds shows ads.

### Which is updated more often, Flex Metronome or DrPhos' Ionic Compounds?

Flex Metronome ships an update every 3 months, and DrPhos' Ionic Compounds every 3 weeks. Most recently, Flex Metronome was updated on November 11, 2026 and DrPhos' Ionic Compounds on November 4, 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.*