Phenol55 vs TruAirspeed
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Phenol55
Manage your wine collection from your iOS device. View detailed bottle information, read or write tasting notes, and schedule pickups or deliveries. This app is exclusively for members cellaring wine with the service.
- Manage wine collection
- View bottle images
- Read tasting notes
- Write tasting notes
- Schedule pickup/delivery
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PHENOL55 enables members to manage their wine collection from their iOS device. Zoomable full bottle images View wine details and inventory totals Read professional tasting notes Write your own tasting notes Schedule a pick-up or delivery for your wine in inventory PHENOL55 is only available to members that are cellaring their wine with PHENOL55.
TruAirspeed
This utility calculates true airspeed, pressure altitude, density altitude, and Mach number. It accounts for compressibility effects and offers unit choices and keypad styles. Users can also input a correction factor for their airspeed indicator.
- True airspeed calculation
- Pressure and density altitude calculation
- Mach number calculation
- Compressibility effects accounted for
- Choice of input/result units
- Calculator or telephone keypad options
- Airspeed indicator correction factor
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TruAirspeed is a True Airspeed Calculator for the iPhone and iPad. It's a bit different from other true airspeed calculators, in which the pressure altitude is an input. This requires resetting the altimeter to the standard sea level pressure of 29.92"Hg to read the pressure altitude. With TruAirspeed, you input the indicated altitude and the Kollsman window's pressure setting — the app then calculates the pressure altitude, density altitude, true airspeed and mach number for you. The calculations involved take full account of compressibility effects, but not shock waves, so it's limited to subsonic, non-transonic flight only. You have a choice of units for inputs and results, and you may choose either a calculator-style keypad (top row: 7-8-9) or a telephone-style keypad (top row: 1-2-3). You may also set a correction factor for your bird's airspeed indicator/pitot-static system, if you know it (mine is 0.95).
Screenshots
Verdict
The clearest difference is update cadence: Phenol55 at every 2 months against TruAirspeed's every 24 months. Phenol55 also leads on rating (4.3 vs 4.1). On price, ratings volume, ads and in-app purchases 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.
Phenol55 holds the better App Store score, 4.3 against 4.1. Both are backed by a comparable volume of ratings — 6 and 8 respectively.
Phenol55 ships an update every 2 months, TruAirspeed every 24 months. The most recent releases landed on September 16, 2026 and June 2, 2026 respectively.
| Parameter | Phenol55 | TruAirspeed |
|---|---|---|
| Price | Free | Free |
| Rating | 4.3 (6 ratings) — better | 4.1 (8 ratings) |
| Positive reviews | — | 71.4% of reviews |
| Number of ratings | 6 | 8 — better |
| Update frequency | Every 2 months — better | Every 24 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 — better | 15.6 |
| Further details — not scored | ||
| Size | 49 MB | 8 MB |
| Age rating | 17+ | 4+ |
| Developer | Riverbend | James Petty |
Customer experience
Phenol55
TruAirspeed
In-app purchases
Phenol55
No in-app purchases
TruAirspeed
No in-app purchases
