FlyTimer vs Custom Formulas
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FlyTimer
Read full descriptionHide full description
FlyTimer - Flight & Duty Time Tracking Professional flight logging with automated Canadian Aviation Regulations compliance monitoring for helicopter pilots. Features Smart Timing One-tap start/stop flight recording Runs when locked or in airplane mode Automatic Transport Canada aviation rounding Continues timing in background Simple Fuel Burn calculator Counter buttons for Landings and Lifts Compliance Tracking Flight duty periods (CAR 703 Day VFR) 60hr/70hr duty rules monitoring Rest period calculations Flight time limits (daily/weekly/monthly) Timezone-aware compliance Flight Management Customizable fields (cycles, landings, bucket drops) Daily summaries and searchable history Flight notes and custom data Email reports and exports Professional flight ticket generation Data & Sync Multi-device iCloud sync Optional company integration via PilotFiles.com Works 100% offline - no subscription required Your data stays on your devices Aviation Rounding Transport Canada standard 6-minute increments: 00-02=0.0, 03-08=0.1, 09-14=0.2, etc.
Custom Formulas
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.
- Multiple input/output formula support
- Linked formulas via variable names
- Formula categorization
- Customizable variable display order
- Adjustable output decimal precision
- Email formula sharing
Read full descriptionHide full description
This app is easy to use, but unlike simpler apps, multiple entered values can be fed into multiple formulas and multiple output values can be displayed. The output of one formula in a group can be fed into the next by using the same variable name. Related formulas can be grouped into categories to make them easy to find. e.g. Maths formulas, Surveying formulas, Loan interest formulas etc. The order of variables displayed to the user can be changed, as can the number of decimal digits of precision shown in the output fields. You can easily share formulas with other users of the app by emailing them. Three example formulas are pre-installed with the app. In order of increasing complexity they are: slope percentage, compound interest, and point scale factor.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | FlyTimer | Custom Formulas |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Best chart rank | — | #186 — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 15.4 — better |
| Further details — not scored | ||
| Size | 4 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Derek Riendeau | Anthony Dunk |
In-app purchases
FlyTimer
No in-app purchases
Custom Formulas
No in-app purchases





