TakeoffAlert vs Vnav4+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TakeoffAlert
This app monitors your aircraft's takeoff performance in real-time, comparing actual data against planned performance. It provides intuitive feedback on your aircraft's position relative to runway requirements during takeoff.
- Real-time takeoff monitoring
- Actual vs. planned performance comparison
- Intuitive data display
- Input takeoff data (TODA, Roll, Stopping Distance)
- Monitor takeoff position
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What is TakeoffAlert? TakeoffAlert is advanced takeoff monitoring app that monitors your takeoff performance through the takeoff event. This data is displayed to the pilot an easy to understand and intuitive format providing value feedback on their aircraft's ACTUAL takeoff performance versus the takeoff planned performance. How does TakeoffAlert work? Simple. 1. Enter your takeoff data: Runway Takeoff Distance Available (TODA); Takeoff Roll; Stopping Distance (see User Guide); Review and Execute the data. 2. When in takeoff position tap the "In Takeoff Position" button to begin monitoring the takeoff. That's it! TakeoffAlert begins monitoring your takeoff, providing realtime feedback about the aircraft is in relation to the runway and the calculated takeoff roll and stop requirements. *** DEVICE REQUIREMENTS *** Wifi ONLY iPads require an EXTERNAL GPS** connected to the iPad (such as Bad Elf Pro). iPod Touch requires an EXTERNAL GPS** connected to the iPod Touch (such as Bad Elf Pro). ** Appareo Stratus 1/2/3 and uAvionix Sentry GPS NOT Supported.
Vnav4+
This navigation app offers four specialized calculators for vertical flight path management. It includes tools for general climb/descent rates, instrument procedure descent angles, obstacle departure climb rates, and top of descent calculations.
- Generic rate of climb calculator
- Generic rate of descent calculator
- Instrument procedure descent angle calculator
- Obstacle departure rate of climb calculator
- Top of descent calculator
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This is a Vertical Navigation app. it has four different climb or descent calculators. A generic rate of climb and rate of descent calculator. A rate of of descent calculator for those Instrument procedures where there is a published vertical descent angle. An obstacle departure rate of climb calculator. And, a top of descent calculator.
Screenshots
Verdict
The clearest difference is update cadence: Vnav4+ at daily against TakeoffAlert's every 9 months. TakeoffAlert's advantage is iOS requirement (15 vs 17.0). On price, rating, ratings volume and ads 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for TakeoffAlert against 5.0 for Vnav4+. Both are backed by a comparable volume of ratings — 2 and 1 respectively.
TakeoffAlert ships an update every 9 months, Vnav4+ daily. The most recent releases landed on October 6, 2026 and October 17, 2026 respectively.
| Parameter | TakeoffAlert | Vnav4+ |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) | 5.0 (1 ratings) |
| Number of ratings | 2 — better | 1 |
| Update frequency | Every 9 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15 — better | 17.0 |
| Further details — not scored | ||
| Size | 15 MB | 5 MB |
| Age rating | 4+ | 17+ |
| Developer | Raymond Chase | William Downing |
Customer experience
TakeoffAlert
Vnav4+
In-app purchases
TakeoffAlert
No in-app purchases
Vnav4+
No in-app purchases









