XFR vs TrueData
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
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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.
TrueData
This app calculates ballistic data for rifles and bullets, factoring in weather and distance. It offers advanced features like muzzle velocity and BC truing, extensive bullet libraries, and customizable rifle and bullet profiles. Exportable trajectory tables and real-time weather integration enhance accuracy for shooters.
- Ballistic calculations
- Real-time weather integration
- Extensive bullet libraries
- Customizable rifle and bullet profiles
- Trajectory table generation
- Muzzle velocity and BC truing
- Spin drift calculation
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Set up your rifles and bullets, refresh the weather and drag out your distance. Turret clicks are calculated on the fly and displayed instantly. Includes the full Sierra and Barnes bullet libraries and Doppler Data, plus: • Muzzle Velocity truing feature • BC truing feature • Barnes Doppler Library • Sierra Doppler Library • Multiple weather input options for any scenario or equipment • Elevation offset option for rifle zero • Intuitive, modern interface • Quickly dial in the wind and target distance • Calculates multiple click adjustments in MRAD or MOA • Supports combinations of metric and imperial • Supports ICAO and US Metro units • Supports G7, G1 and many other drag models • Supports either single, or up to 6 BC entries • Create and save your own rifles and bullets • Quickly view and duplicate bullets and rifles • Calculates spin drift • Retrieves weather at your location • Allows overriding temperature, humidity, air pressure • Automatically detects shooting angle (up/dn) • Generates trajectory tables showing zero and transonic zone • Ability to export trajectories as CSV/TSV/Pipe and PDF Report • Displays equivalent 1 MOA & MRAD when choosing distance • Displays equivalent 1 click of current scope at distance • Haptic feedback for positive button presses • Export your settings, rifles and bullets to Google Drive, DropBox, Email... • Import your settings, rifles and bullets to make switching devices easier • Add multiple distances to view a convenient Target Card • Connect your Bluetooth weather device for real-time changes (currently supports Calypso, Kestrel, Skywatch and WeatherFlow) • Account for weather conditions while zeroing (Zero Weather) • Allow for variations in powder temperature with a simple interface • Allow for chronograph distance in bullet velocity • Fine tune your exact Wind Direction in a popup • Convenient Training Timer • Quick compass option in the Wind card • Virtual Range Finder estimates your target distance via GPS • Select basic or detailed form entry options in settings • Adjust your rifle's Scope Scale Factor • Round trajectories to your scope's clicks
Screenshots
Verdict
The clearest difference is review sentiment: TrueData at 100% against XFR's 43%. TrueData also leads on rating (5.0 vs 4.6) and update cadence (every 4 weeks vs every 35 months). XFR's advantage is ratings volume (825 vs 11) and iOS requirement (11.0 vs 15.6). On price, ads, in-app purchases and monetization model 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.
TrueData holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: XFR has 825 ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 43% of XFR's written reviews are positive against 100% of TrueData's.
XFR ships an update every 35 months, TrueData every 4 weeks. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.
| Parameter | XFR | TrueData |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (825 ratings) | 5.0 (11 ratings) — better |
| Positive reviews | 43.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 825 — better | 11 |
| Update frequency | Every 35 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 11.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 17 MB | 32 MB |
| Age rating | 4+ | 17+ |
| Developer | Nielsen-Kellerman Co. | Sierra Bullets LLC |
Customer experience
XFR
TrueData
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
TrueData
Not enough reviews yet to summarise bugs or requests.
In-app purchases
XFR
No in-app purchases
TrueData
No in-app purchases








