Comparison

SIG BDX vs TrueData

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

SIG BDX

This application connects a rangefinder to a riflescope, displaying an illuminated holdover dot for precise aiming. It facilitates syncing devices and provides ballistic data for accurate shots up to 800 yards.

Highlights
  • Sync rangefinder with riflescope
  • Display illuminated holdover dot
  • Measure target distance
  • Ballistic data integration
  • Connect The Dot™ system
Features
Read full description

The KILO BDX rangefinders use Applied Ballistics and Bluetooth® to illuminate the exact holdover dot in SIERRA3BDX riflescopes. For the most accurate and ethical shot, just Connect The Dot™. - DOWNLOAD: Download the app - SYNC: Sync the app with your rangefinder - BOND: Use the app to bond the rangefinder with the riflescope - RANGE: Press the RANGE button to measure the distance of your target - POWER SELECTOR RING: When the SIERRA3BDX riflescope is actively paired with a KILO BDX rangefinder, the blue LED on the power selector ring will be illuminated solid blue. This Blue LED will flash quickly 8X for one second whenever the riflescope has received a new holdover reticle update from the rangefinder. The BDX system works out to 800 yards with 1 MOA of accuracy - CONNECT THE DOT™: It’s time for hunting. Once the riflescope is turned on, range the target and the new hold is lit up out to 800 yards

About

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.

Highlights
  • 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
Features
Read full description

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

SIG BDX4 screens
TrueData4 screens

Verdict

The call

The clearest difference is review sentiment: TrueData at 100% against SIG BDX's 33%. TrueData also leads on rating (5.0 vs 3.4). SIG BDX's advantage is ratings volume (69 vs 12). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

TrueData holds the better App Store score, 5.0 against 3.4. That said, the two scores are not equally well evidenced: SIG BDX has 69 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 33% of SIG BDX's written reviews are positive against 100% of TrueData's.

UpkeepUpdate frequency

SIG BDX ships an update every 3 weeks, TrueData every 4 weeks. The most recent releases landed on November 11, 2026 and November 9, 2026 respectively.

Scorecard3 real differences · 7 level
SIG BDX versus TrueData: the parameters behind the verdict, then further details
ParameterSIG BDXTrueData
PriceFreeFree
Rating3.4 (69 ratings)5.0 (12 ratings) — better
Positive reviews33.3% of reviews100.0% of reviews — better
Number of ratings69 — better12
Update frequencyEvery 3 weeks — betterEvery 4 weeks
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.015.6 — better
Further details — not scored
Size137 MB32 MB
Age rating4+17+
DeveloperSig Sauer, Inc.Sierra Bullets LLC

Customer experience

SIG BDX

All ratings68 ratings
Positive50.0%
Neutral20.6%
Negative29.4%
Written reviews42 reviews
Positive33.3%
Neutral21.4%
Negative45.2%

TrueData

All ratings11 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

SIG BDX

No in-app purchases

None

TrueData

No in-app purchases

Questions

Is SIG BDX free?
SIG BDX is free to download, with no in-app purchases.
Is TrueData free?
TrueData is free to download, with no in-app purchases.
Which has better reviews, SIG BDX or TrueData?
TrueData is rated higher. SIG BDX averages 3.4 out of 5 from 69 ratings, while TrueData averages 5.0 from 12 ratings.
Do SIG BDX or TrueData have ads?
Neither SIG BDX nor TrueData shows ads.
Which is updated more often, SIG BDX or TrueData?
SIG BDX ships an update every 3 weeks, and TrueData every 4 weeks. Most recently, SIG BDX was updated on November 11, 2026 and TrueData on November 9, 2026.

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