# DrPhos Science Calculator vs Abacus Plus+

The clearest difference is in-app purchases: Abacus Plus+ at none against DrPhos Science Calculator's 10. Abacus Plus+ also leads on update cadence (every 4 days vs every 3 weeks). DrPhos Science Calculator's advantage is iOS requirement (18.5 vs 26.5). On price, ads and device support there is nothing between them.

Both are free to download. DrPhos Science Calculator sells 10 one-off in-app purchases. Abacus Plus+ asks for nothing beyond the download.

DrPhos Science Calculator ships an update every 3 weeks, Abacus Plus+ every 4 days. Both last shipped on September 24, 2026.

## The numbers

| Metric | DrPhos Science Calculator | Abacus Plus+ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Size | 11 MB | 10 MB |
| Requires iOS | **18.5** | 26.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Monte L Helm](https://appshunter.io/developer/1715082616) | [Vijayvir Singh](https://appshunter.io/developer/1469680736) |

## What reviewers say

### DrPhos Science Calculator

[App page](https://appshunter.io/ios/app/drphos-science-calculator/id6747954398)

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

**In-app purchases (10)**

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


### Abacus Plus+

[App page](https://appshunter.io/ios/app/abacus-plus-plus/id6789564318)

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

**In-app purchases:** none


## Frequently asked questions

### Is DrPhos Science Calculator free?

DrPhos Science Calculator is free to download, with in-app purchases available.

### Is Abacus Plus+ free?

Abacus Plus+ is free to download, with no in-app purchases.

### Do DrPhos Science Calculator or Abacus Plus+ have ads?

Neither DrPhos Science Calculator nor Abacus Plus+ shows ads.

### Which is updated more often, DrPhos Science Calculator or Abacus Plus+?

DrPhos Science Calculator ships an update every 3 weeks, and Abacus Plus+ every 4 days. Most recently, DrPhos Science Calculator was updated on September 24, 2026 and Abacus Plus+ on September 24, 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.*