# Equation vs 555 Timer & Oscillators Pro

The clearest difference is update cadence: Equation at monthly against 555 Timer & Oscillators Pro's every 3 months. Equation also leads on price ($1.99 vs $4.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Equation costs $1.99 and 555 Timer & Oscillators Pro $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Equation ships an update monthly, 555 Timer & Oscillators Pro every 3 months. The most recent releases landed on August 16, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Equation | 555 Timer & Oscillators Pro |
| --- | --- | --- |
| Price | **$1.99** | $4.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 3 months |
| Size | 30 MB | 22 MB |
| Requires iOS | **15.1** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### Equation

[App page](https://appshunter.io/ios/app/equation-solver-pro/id1618982773)

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

**In-app purchases:** none


### 555 Timer & Oscillators Pro

[App page](https://appshunter.io/ios/app/555-timer-and-oscillators-pro/id6504415162)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Equation free?

Equation costs $1.99, with no in-app purchases.

### Is 555 Timer & Oscillators Pro free?

555 Timer & Oscillators Pro costs $4.99, with no in-app purchases.

### Do Equation or 555 Timer & Oscillators Pro have ads?

Neither Equation nor 555 Timer & Oscillators Pro shows ads.

### Which is updated more often, Equation or 555 Timer & Oscillators Pro?

Equation ships an update monthly, and 555 Timer & Oscillators Pro every 3 months. Most recently, Equation was updated on August 16, 2026 and 555 Timer & Oscillators Pro 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.*