# DevIndex vs FormulaPad

The clearest difference is in-app purchases: DevIndex at none against FormulaPad's 1. DevIndex also leads on update cadence (weekly vs every 2 months) and iOS requirement (15.1 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. FormulaPad sells 1 one-off in-app purchase. DevIndex asks for nothing beyond the download.

DevIndex ships an update weekly, FormulaPad every 2 months. The most recent releases landed on September 30, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | DevIndex | FormulaPad |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | — | Free with in-app purchases |
| Size | 37 MB | 3 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Dao Duong](https://appshunter.io/developer/1851400410) | [小倩 徐](https://appshunter.io/developer/6771586178) |

## What reviewers say

### DevIndex

[App page](https://appshunter.io/ios/app/devindex/id6758738242)

**Features:** macOS Compatibility

**In-app purchases:** none


### FormulaPad

[App page](https://appshunter.io/ios/app/formulapad/id6785820497)

A local-first math notebook calculator for iPhone. Type natural formulas, reuse variables, and save calculations as notes. Includes practical templates and unit conversions for everyday math needs.

**Highlights:** Natural formula input, Variable reuse, Calculation history, Math notes, Practical templates, Unit conversion, Function plotting

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FormulaPad Pro | $0.99 | one-time |


## Frequently asked questions

### Is DevIndex free?

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

### Is FormulaPad free?

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

### Do DevIndex or FormulaPad have ads?

Neither DevIndex nor FormulaPad shows ads.

### Which is updated more often, DevIndex or FormulaPad?

DevIndex ships an update weekly, and FormulaPad every 2 months. Most recently, DevIndex was updated on September 30, 2026 and FormulaPad on September 29, 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.*