XFR vs TRASOL
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
XFR
Connect your Magnetospeed chronograph to your iOS device to manage velocity data. Organize multiple data series, email results, or back them up with iCloud. Adjust device settings and clear data directly from your phone.
- Transfer velocity data
- Manage multiple data series
- Email data
- iCloud backup
- Clear device data
- Adjust device settings
Read full descriptionHide full description
This app allows Magnetospeed (MS) chronograph users to transfer velocity data to their iOS device. A user can manage multiple data series within the app and also send data via email or back it up with iCoud. The app can also clear the current data from the MS device and also change/adjust the MS device settings. Note: The XFR app needs permission to access your iPhone's microphone.
TRASOL
This advanced ballistic calculator provides real-time environmental data and trajectory predictions for precision shooting. It features a heads-up display for automatic target solutions, moving target tracking, and shot logging capabilities.
- Real-time sensor integration
- Heads-up display (HUD)
- Moving target tracking
- Unlimited equipment profiles
- Cloud backup/sync
- Long-range accuracy up to 5000 yards
- Scope turret calibration
Read full descriptionHide full description
Stop adjusting – start hitting. Utilize the most effective ballistic software ever invented. Simple, intuitive and now integrated with smart sensors. With the tap of a button you can calibrate density altitude, Coriolis, cant and slope in real-time. Fully integrated with our new heads-up display, TRASOL enables you to capture video and snapshots, as well as track moving targets. TRASOL was developed for precision shooters who desire first round hit accuracy out to 5000 yards. FEATURES • Interfacing HUD • Automatic device sensor input • Unlimited equipment profiles • Cloud backup/sync for equipment data • Range up to 5000 yards (4572 meters) • Highly accurate trajectory prediction • Moving target speed tracking • Scope turret calibration • Cold bore adjustment • Light/dark color themes • Built-in tutorials HEADS-UP DISPLAY There is genius in simplicity. TRASOL is the first ballistic application to incorporate Heads-Up Display technology. By using your iPhone’s or iPad’s built-in camera and onboard sensors, TRASOL allows users to point their device at their target and automatically generate absolute accuracy solutions. The HUD environment has highly intuitive drag-and-drop tools for quick input of range and wind, and the device’s sensors do the rest. The HUD also allows tracking of moving targets to provide very accurate lead solutions. Photo/video capturing capability allows you to log your shots easily and share them with your friends. REFINED ACCURACY Utilizing proprietary algorithms, TRASOL is the most accurate ballistics calculator on the planet. No more need to alter manufacturer bullet data to get your hits; we developed new algorithms using Doppler radar data to create the most predictive flight path possible. In live-fire testing of TRASOL’s predictions the following results were documented (.338LM ammunition, using manufacturer's published data): • Within 0.1 MRAD up to 1400 yards • Within 0.5 meters up to 1700 yards • Within 1.1 meters at 2200 yards
Screenshots
Verdict
The clearest difference is rating: XFR at 4.6 against TRASOL's 4.0. XFR also leads on in-app purchases (none vs 1) and ratings volume (824 vs 40). TRASOL's advantage is update cadence (every 10 months vs every 35 months) and review sentiment (52% vs 43%). On price, ads, device support and iOS requirement 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. TRASOL sells 1 one-off in-app purchase. XFR asks for nothing beyond the download.
XFR holds the better App Store score, 4.6 against 4.0. That said, the two scores are not equally well evidenced: XFR has 824 ratings behind it against 40, so its average is the more settled of the two. Written reviews complicate that: 43% of XFR's written reviews are positive against 52% of TRASOL's, so the app with the better star average is not the one people write more warmly about.
XFR ships an update every 35 months, TRASOL every 10 months. The most recent releases landed on September 19, 2026 and September 23, 2026 respectively.
| Parameter | XFR | TRASOL |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (824 ratings) — better | 4.0 (40 ratings) |
| Positive reviews | 43.3% of reviews | 52.4% of reviews — better |
| Number of ratings | 824 — better | 40 |
| Update frequency | Every 35 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 17 MB | 11 MB |
| Age rating | 4+ | 17+ |
| Developer | Nielsen-Kellerman Co. | Desert Tech |
Customer experience
XFR
TRASOL
Bugs and requests
XFR
Reported bugs
3 issues- Won't sync to iPhone
- Doesn't work on iPhone 7, iPhone X, iPhone 14 Pro Max
- Delayed syncing, have to unplug and plug back in iPhone
Requested features
5 requests- Ability to separate load data from one continuous session
- More useful database features like Chronolog or Caldwell apps
- User-adjustable color scheme
- Active syncing between iPhone and iPad
- iCloud syncing for data access across devices
TRASOL
Not enough reviews yet to summarise bugs or requests.
In-app purchases
XFR
No in-app purchases
TRASOL
- Full TRASOL Upgrade$39.99









