# FlyTimer vs Custom Formulas

The clearest difference is price: FlyTimer at Free against Custom Formulas's $3.99. Custom Formulas's advantage is update cadence (every 5 days vs every 2 months) and chart position (#186 vs unranked). On ads, in-app purchases and device support there is nothing between them.

FlyTimer is free to download; Custom Formulas costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

FlyTimer ships an update every 2 months, Custom Formulas every 5 days. The most recent releases landed on May 26, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | FlyTimer | Custom Formulas |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/custom-formulas/id1623368630/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | — | Paid |
| Best chart rank | — | **#186** |
| Size | 4 MB | 1 MB |
| Requires iOS | 26.0 | **15.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Derek Riendeau](https://appshunter.io/developer/878864321) | [Anthony Dunk](https://appshunter.io/developer/704471943) |

## What reviewers say

### FlyTimer

[App page](https://appshunter.io/ios/app/flytimer/id878864318)

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

**In-app purchases:** none


### Custom Formulas

[App page](https://appshunter.io/ios/app/custom-formulas/id1623368630)

**Currently charting:** #186 Top Paid · Utilities (US App Store)

This utility app allows users to create and manage complex calculations with multiple inputs and outputs. Formulas can be linked, grouped into categories, and customized for display precision. Share your custom calculations easily via email.

**Highlights:** Multiple input/output formula support, Linked formulas via variable names, Formula categorization, Customizable variable display order, Adjustable output decimal precision, Email formula sharing

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

**In-app purchases:** none


## Frequently asked questions

### Is FlyTimer free?

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

### Is Custom Formulas free?

Custom Formulas costs $3.99, with no in-app purchases.

### Do FlyTimer or Custom Formulas have ads?

Neither FlyTimer nor Custom Formulas shows ads.

### Which is updated more often, FlyTimer or Custom Formulas?

FlyTimer ships an update every 2 months, and Custom Formulas every 5 days. Most recently, FlyTimer was updated on May 26, 2026 and Custom Formulas on September 18, 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.*