BulletDrop+ vs SIG BDX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- External ballistics calculation
- iCloud support for load data
- Store commonly used datasets
- Selectable drag function
- Selectable output units (inches, MOA, mils)
- Fetch weather conditions
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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!
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.
- Sync rangefinder with riflescope
- Display illuminated holdover dot
- Measure target distance
- Ballistic data integration
- Connect The Dot™ system
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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
Verdict
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
Both are free to download. BulletDrop+ sells 6 one-off in-app purchases. SIG BDX asks for nothing beyond the download.
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.
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.
| Parameter | BulletDrop+ | SIG BDX |
|---|---|---|
| Price | Free | Free |
| Rating | 3.9 (76 ratings) — better | 3.4 (68 ratings) |
| Positive reviews | 51.4% of reviews — better | 33.3% of reviews |
| Number of ratings | 76 — better | 68 |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 13.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 2 MB | 137 MB |
| Age rating | 4+ | 4+ |
| Developer | Mark Descalzo | Sig Sauer, Inc. |
Customer experience
BulletDrop+
SIG BDX
In-app purchases
BulletDrop+
- Chocolate Bar$0.99
- Cup of Coffee$1.99
- Doughnut$2.99
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- Coffee-themed Beverage$4.99
- Bag of Coffee$14.99
- Sack of Coffee$29.99
SIG BDX
No in-app purchases
Questions
Is BulletDrop+ free?
Is SIG BDX free?
Which has better reviews, BulletDrop+ or SIG BDX?
Do BulletDrop+ or SIG BDX have ads?
Which is updated more often, BulletDrop+ or SIG BDX?
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