Comparison

BulletDrop+ vs SIG BDX

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

Head to head
About

BulletDrop+

Calculate bullet trajectory, energy, and drift with precise inputs. Store custom loads, fetch weather data, and choose output units for accurate shooting predictions. Ideal for handloaders and shooters to understand cartridge performance.

Highlights
  • External ballistics calculation
  • iCloud support for load data
  • Store commonly used datasets
  • Selectable drag function
  • Selectable output units (inches, MOA, mils)
  • Fetch weather conditions
Features
Read full description

A simple, easy to use external ballistics calculator. It accepts inputs of bullet weight, ballistic coefficient, muzzle velocity, sight height, zero range, wind speed & angle, etc and calculates velocity, energy, flight path, and drift. Features: * iCloud support. Store load data on iCloud and have it available on all your iCloud-enabled iOS devices. * Clean & simple user interface. * Store commonly used datasets. * Selectable drag function for ballistic coefficients calculate based upon models. * Selectable output units: inches, MOA, & mils. * Selectable max range and range increments under Settings. * Fetch weather conditions for your location. BulletDrop+ is intended for hand loaders and shooters of all varieties. It give them an idea what various cartridges and load recipes will do at the range. As alway, the information provided by BulletDrop+, or any other calculator, is no substitute for actual range time. Get out and shoot!

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

Screenshots

BulletDrop+4 screens
SIG BDX4 screens

Verdict

The call

The clearest difference is rating: BulletDrop+ at 3.9 against SIG BDX's 3.4. BulletDrop+ also leads on review sentiment (51% vs 33%) and iOS requirement (13.0 vs 16.0). SIG BDX's advantage is in-app purchases (none vs 6) and update cadence (every 3 weeks vs every 4 months). On price, ratings volume, ads and device support 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. BulletDrop+ sells 6 one-off in-app purchases. SIG BDX asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

BulletDrop+ holds the better App Store score, 3.9 against 3.4. Both are backed by a comparable volume of ratings — 76 and 68 respectively. Written reviews point the same way: 51% of BulletDrop+'s written reviews are positive against 33% of SIG BDX's.

UpkeepUpdate frequency

BulletDrop+ ships an update every 4 months, SIG BDX every 3 weeks. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.

Scorecard6 real differences · 4 level
BulletDrop+ versus SIG BDX: the parameters behind the verdict, then further details
ParameterBulletDrop+SIG BDX
PriceFreeFree
Rating3.9 (76 ratings) — better3.4 (68 ratings)
Positive reviews51.4% of reviews — better33.3% of reviews
Number of ratings76 — better68
Update frequencyEvery 4 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPodiPhone, iPad
Requires iOS13.0 — better16.0
Further details — not scored
Size2 MB137 MB
Age rating4+4+
DeveloperMark DescalzoSig Sauer, Inc.

Customer experience

BulletDrop+

All ratings76 ratings
Positive68.4%
Neutral13.2%
Negative18.4%
Written reviews74 reviews
Positive51.4%
Neutral18.9%
Negative29.7%

SIG BDX

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

In-app purchases

6 purchases

BulletDrop+

One-time6
  • Chocolate Bar$0.99
  • Cup of Coffee$1.99
  • Doughnut$2.99
Show 3 more
  • Coffee-themed Beverage$4.99
  • Bag of Coffee$14.99
  • Sack of Coffee$29.99
None

SIG BDX

No in-app purchases

Questions

Is BulletDrop+ free?
BulletDrop+ is free to download, with in-app purchases available.
Is SIG BDX free?
SIG BDX is free to download, with no in-app purchases.
Which has better reviews, BulletDrop+ or SIG BDX?
BulletDrop+ is rated higher. BulletDrop+ averages 3.9 out of 5 from 76 ratings, while SIG BDX averages 3.4 from 68 ratings.
Do BulletDrop+ or SIG BDX have ads?
Neither BulletDrop+ nor SIG BDX shows ads.
Which is updated more often, BulletDrop+ or SIG BDX?
BulletDrop+ ships an update every 4 months, and SIG BDX every 3 weeks. Most recently, BulletDrop+ was updated on October 13, 2026 and SIG BDX on October 14, 2026.

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