# FieldTripMe™ vs DrPhos' pH Calculator

The clearest difference is price: FieldTripMe™ at Free against DrPhos' pH Calculator's $0.99. FieldTripMe™ also leads on rating (5.0 vs 3.7) and in-app purchases (none vs 11). DrPhos' pH Calculator's advantage is update cadence (every 10 days vs every 4 months) and ratings volume (3 vs 1). On ads and device support there is nothing between them.

FieldTripMe™ is free to download; DrPhos' pH Calculator costs $0.99 up front. DrPhos' pH Calculator sells 11 one-off in-app purchases. FieldTripMe™ asks for nothing beyond the download.

FieldTripMe™ holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

FieldTripMe™ ships an update every 4 months, DrPhos' pH Calculator every 10 days. The most recent releases landed on October 3, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | FieldTripMe™ | DrPhos' pH Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fieldtripme/id1498502138/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/drphos-ph-calculator/id6477762321/reviews) |
| Number of ratings | 1 | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 10 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 56 MB | 15 MB |
| Requires iOS | **15.6** | 17.2 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Robert Richman](https://appshunter.io/developer/1498502137) | [Monte L Helm](https://appshunter.io/developer/1715082616) |

## What reviewers say

### FieldTripMe™

[App page](https://appshunter.io/ios/app/fieldtripme/id1498502138)

This app enhances school field trips by providing teachers with student location tracking, navigation, and secure messaging. It also delivers learning points and activities, alerting educators to checkpoints and boundary crossings.

**Highlights:** Student location tracking, Trip navigation, Learning points and activities delivery, Checkpoint and boundary alerts, Secure teacher-student messaging, Trip planning via website

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

**In-app purchases:** none


### DrPhos' pH Calculator

[App page](https://appshunter.io/ios/app/drphos-ph-calculator/id6477762321)

This tool instantly calculates pH, pOH, and ion concentrations for strong and weak acids and bases. It supports molarity and scientific notation, ensuring accurate results for general chemistry problems.

**Highlights:** Calculate pH, pOH, [H⁺], or [OH⁻], Handles strong and weak acids/bases, Supports Ka and Kb values, Built-in molarity and scientific notation, Automatic pH + pOH = 14, Clean, focused layout

**Features:** macOS Compatibility

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Science Calculator | $0.99 | one-time |
| Quadratic Equation Solver | $0.99 | one-time |
| Significant Figures Calculator | $0.99 | one-time |
| Molar Mass Calculator | $0.99 | one-time |
| Stoichiometry | $0.99 | one-time |
| pH Calculator | $0.99 | one-time |
| Ionic Compound Builder | $0.99 | one-time |
| General Chemistry Naming | $0.99 | one-time |
| Solution Concentrations | $0.99 | one-time |
| Reaction Balancer | $0.99 | one-time |
| Kinetics Calculator | $0.99 | one-time |


## Frequently asked questions

### Is FieldTripMe™ free?

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

### Is DrPhos' pH Calculator free?

DrPhos' pH Calculator costs $0.99, and also offers in-app purchases.

### Which has better reviews, FieldTripMe™ or DrPhos' pH Calculator?

FieldTripMe™ is rated higher. FieldTripMe™ averages 5.0 out of 5 from 1 ratings, while DrPhos' pH Calculator averages 3.7 from 3 ratings.

### Do FieldTripMe™ or DrPhos' pH Calculator have ads?

Neither FieldTripMe™ nor DrPhos' pH Calculator shows ads.

### Which is updated more often, FieldTripMe™ or DrPhos' pH Calculator?

FieldTripMe™ ships an update every 4 months, and DrPhos' pH Calculator every 10 days. Most recently, FieldTripMe™ was updated on October 3, 2026 and DrPhos' pH Calculator on October 6, 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.*