# Washington CDL Test Prep vs DrPhos' Ionic Compounds

Washington CDL Test Prep and DrPhos' Ionic Compounds both sit at 5.0 stars, but that hides the real split: 100% of DrPhos' Ionic Compounds's written reviews are positive against 0% of Washington CDL Test Prep's. DrPhos' Ionic Compounds also leads on update cadence (every 3 weeks vs every 39 months) and ratings volume (8 vs 1). Washington CDL Test Prep's advantage is price (Free vs $0.99) and iOS requirement (15.0 vs 17.0). On rating, ads, in-app purchases and device support there is nothing between them.

Washington CDL Test Prep is free to download; DrPhos' Ionic Compounds costs $0.99 up front. Washington CDL Test Prep sells 10 one-off in-app purchases 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 Washington CDL Test Prep 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 are what separate them: 0% of Washington CDL Test Prep's written reviews are positive against 100% of DrPhos' Ionic Compounds's.

Washington CDL Test Prep ships an update every 39 months, DrPhos' Ionic Compounds every 3 weeks. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Washington CDL Test Prep | DrPhos' Ionic Compounds |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/washington-cdl-test-prep/id1083696151/reviews)** | [4.9 (8 ratings)](https://appshunter.io/ios/app/drphos-ionic-compounds/id6473097401/reviews) |
| Number of ratings | 1 | **8** |
| Positive reviews | 0.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 39 months | **Every 3 weeks** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 10 MB | 15 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kelvin Beecroft](https://appshunter.io/developer/301291170) | [Monte L Helm](https://appshunter.io/developer/1715082616) |

## What reviewers say

### Washington CDL Test Prep

[App page](https://appshunter.io/ios/app/washington-cdl-test-prep/id1083696151)

Prepare for your Washington Commercial Learners Permit and CDL endorsements with comprehensive practice tests and state-specific content. This app offers detailed explanations and personalized learning paths to help you succeed on your written exams.

**Highlights:** 580+ practice questions, State-specific content, Multiple-choice, true/false, fill-in-the-blank, Detailed explanations, Personalized learning paths, User-friendly interface

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Air Brakes Cheat Sheet | $2.99 | one-time |
| Cargo Cheat Sheet | $2.99 | one-time |
| Passenger Cheat Sheet | $2.99 | one-time |
| School Bus Cheat Sheet | $2.99 | one-time |
| Air Brakes | $2.99 | one-time |
| School Buses | $4.99 | one-time |
| Tank Vehicles | $4.99 | one-time |
| Hazardous Materials | $7.99 | one-time |
| CDL Class B Learners Permit | $9.99 | one-time |
| CDL Class A Learners Permit | $12.99 | one-time |


### 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 Washington CDL Test Prep free?

Washington CDL Test Prep 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, Washington CDL Test Prep or DrPhos' Ionic Compounds?

Washington CDL Test Prep is rated higher. Washington CDL Test Prep averages 5.0 out of 5 from 1 ratings, while DrPhos' Ionic Compounds averages 4.9 from 8 ratings.

### Do Washington CDL Test Prep or DrPhos' Ionic Compounds have ads?

Neither Washington CDL Test Prep nor DrPhos' Ionic Compounds shows ads.

### Which is updated more often, Washington CDL Test Prep or DrPhos' Ionic Compounds?

Washington CDL Test Prep ships an update every 39 months, and DrPhos' Ionic Compounds every 3 weeks. Most recently, Washington CDL Test Prep was updated on November 2, 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.*