# Expression Solver vs SPI

The clearest difference is ads: SPI at none against Expression Solver's shown. Expression Solver's advantage is update cadence (monthly vs every 4 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Expression Solver ships an update monthly, SPI every 4 months. The most recent releases landed on October 5, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Expression Solver | SPI |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 4 months |
| Monetization | Ad-supported | — |
| Size | 47 MB | 50 MB |
| Requires iOS | **15.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Francesco Varotti](https://appshunter.io/developer/1501752853) | [BluCloud Srl Semplificata](https://appshunter.io/developer/914061639) |

## What reviewers say

### Expression Solver

[App page](https://appshunter.io/ios/app/expression-solver/id1555902561)

This app provides step-by-step solutions for mathematical expressions, helping users improve their math skills. It features a specialized keyboard for easy input of complex numbers and offers practice exercises with detailed explanations.

**Highlights:** Instant expression solving, Step-by-step explanations, Math keyboard for complex input, Practice exercises with solutions, Intuitive interface

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

**In-app purchases:** none


### SPI

[App page](https://appshunter.io/ios/app/spi/id6753811833)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Expression Solver free?

Expression Solver is free to download, with no in-app purchases.

### Is SPI free?

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

### Do Expression Solver or SPI have ads?

Expression Solver shows ads; SPI does not.

### Which is updated more often, Expression Solver or SPI?

Expression Solver ships an update monthly, and SPI every 4 months. Most recently, Expression Solver was updated on October 5, 2026 and SPI on October 9, 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.*