# Attendly by Coding Ladies vs Engineering Formulas

The clearest difference is in-app purchases: Attendly by Coding Ladies at none against Engineering Formulas's 3. Engineering Formulas's advantage is update cadence (every 2 months vs every 6 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Engineering Formulas sells 3 in-app purchases, starting at $4.99 per 7 days. Attendly by Coding Ladies asks for nothing beyond the download.

Attendly by Coding Ladies ships an update every 6 months, Engineering Formulas every 2 months. The most recent releases landed on October 7, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Attendly by Coding Ladies | Engineering Formulas |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Size | 37 MB | 45 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Claude Amadu](https://appshunter.io/developer/1692016774) | [Mobin Akhter](https://appshunter.io/developer/1812505286) |

## What reviewers say

### Attendly by Coding Ladies

[App page](https://appshunter.io/ios/app/attendly-by-coding-ladies/id6741072948)

**Features:** macOS Compatibility

**In-app purchases:** none


### Engineering Formulas

[App page](https://appshunter.io/ios/app/engineering-formulas-engiref/id6758258119)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium | $4.99 | per 7 days |
| Yearly Premium | $29.99 | per year |
| Lifetime Access | $54.99 | one-time |


## Frequently asked questions

### Is Attendly by Coding Ladies free?

Attendly by Coding Ladies is free to download, with no in-app purchases.

### Is Engineering Formulas free?

Engineering Formulas is free to download, with in-app purchases available.

### Do Attendly by Coding Ladies or Engineering Formulas have ads?

Neither Attendly by Coding Ladies nor Engineering Formulas shows ads.

### Which is updated more often, Attendly by Coding Ladies or Engineering Formulas?

Attendly by Coding Ladies ships an update every 6 months, and Engineering Formulas every 2 months. Most recently, Attendly by Coding Ladies was updated on October 7, 2026 and Engineering Formulas on October 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.*