# Formula Box (LaTeX) vs KeyStart

The clearest difference is ads: KeyStart at none against Formula Box (LaTeX)'s shown. KeyStart also leads on update cadence (every 13 months vs every 49 months) and monetization model (free vs ad-supported). Formula Box (LaTeX)'s advantage is rating (1.3 vs 1.0) and ratings volume (3 vs 1). 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.

Formula Box (LaTeX) holds the better App Store score, 1.3 against 1.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Formula Box (LaTeX) ships an update every 49 months, KeyStart every 13 months. The most recent releases landed on June 9, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Formula Box (LaTeX) | KeyStart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.3 (3 ratings)](https://appshunter.io/ios/app/formula-box-latex/id1366207056/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/keystart/id6749829964/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | 42.9% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 49 months | **Every 13 months** |
| Monetization | Ad-supported | **Free** |
| Size | 10 MB | 24 MB |
| Requires iOS | **15.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [坤宁 毛](https://appshunter.io/developer/1201945856) | [Bernhard Mitas](https://appshunter.io/developer/1802023240) |

## What reviewers say

### Formula Box (LaTeX)

[App page](https://appshunter.io/ios/app/formula-box-latex/id1366207056)

This app allows users to write and edit mathematical and scientific formulas using LaTeX notation. It features a smart equation solver, a public formula library, and the ability to save and organize personal formulas. Calculations can be performed offline with high precision.

**Highlights:** LaTeX-powered formula editor, Smart equation solver, Public formula library, Personal formula collection, Variable presets, High-precision results

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

**In-app purchases:** none


### KeyStart

[App page](https://appshunter.io/ios/app/keystart/id6749829964)

This utility app provides a reliable pitch tool for choirs, a cappella groups, and vocalists. Select your desired key, play the correct chord or note, and ensure your group starts singing in tune.

**Highlights:** Choir pitch tool, A cappella group support, Vocalist tuning, Key selection, Chord and note playback, Singing in tune

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

**In-app purchases:** none


## Frequently asked questions

### Is Formula Box (LaTeX) free?

Formula Box (LaTeX) is free to download, with no in-app purchases.

### Is KeyStart free?

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

### Which has better reviews, Formula Box (LaTeX) or KeyStart?

Formula Box (LaTeX) is rated higher. Formula Box (LaTeX) averages 1.3 out of 5 from 3 ratings, while KeyStart averages 1.0 from 1 ratings.

### Do Formula Box (LaTeX) or KeyStart have ads?

Formula Box (LaTeX) shows ads; KeyStart does not.

### Which is updated more often, Formula Box (LaTeX) or KeyStart?

Formula Box (LaTeX) ships an update every 49 months, and KeyStart every 13 months. Most recently, Formula Box (LaTeX) was updated on June 9, 2026 and KeyStart on September 19, 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.*