Nikon SpotOn vs SIG BDX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Nikon SpotOn
This app calculates precise aiming points for Nikon BDC reticle riflescopes. It also provides instant sighting references for other Nikon riflescopes with various reticle types. The tool helps users determine optimal shooting solutions before firing a shot.
- Precise aiming points for BDC reticles
- Sighting references for other Nikon reticles
- Rangefinder integration
- Load comparison
- Atmospheric condition adjustments
- Field reference chart creation
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Spot On Ballistic Match Technology provides precise aiming points for any Nikon BDC reticle riflescope and instant reference for sighting in other Nikon riflescopes with plex, MilDot or standard crosshair reticles. All you need is a rifle, a Nikon riflescope and a rangefinder…SpotOn does all the work for you, showing you what the possibilities are before you ever fire a shot! Includes sections for handloaders, atmospheric conditions, comparing loads as well as the ability to create and email a field reference chart.
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: SIG BDX at 3.4 against Nikon SpotOn's 2.1. SIG BDX also leads on update cadence (every 3 weeks vs every 6 months) and review sentiment (33% vs 22%). Nikon SpotOn's advantage is ratings volume (380 vs 68) and iOS requirement (14.5 vs 16.0). 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.
SIG BDX holds the better App Store score, 3.4 against 2.1. That said, the two scores are not equally well evidenced: Nikon SpotOn has 380 ratings behind it against 68, so its average is the more settled of the two. Written reviews point the same way: 22% of Nikon SpotOn's written reviews are positive against 33% of SIG BDX's.
Nikon SpotOn ships an update every 6 months, SIG BDX every 3 weeks. Both last shipped on October 22, 2026.
| Parameter | Nikon SpotOn | SIG BDX |
|---|---|---|
| Price | Free | Free |
| Rating | 2.1 (380 ratings) | 3.4 (68 ratings) — better |
| Positive reviews | 21.9% of reviews | 33.3% of reviews — better |
| Number of ratings | 380 — better | 68 |
| Update frequency | Every 6 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.5 — better | 16.0 |
| Further details — not scored | ||
| Size | 7 MB | 137 MB |
| Age rating | 4+ | 4+ |
| Developer | Nikon Inc. | Sig Sauer, Inc. |
Customer experience
Nikon SpotOn
SIG BDX
Bugs and requests
Nikon SpotOn
Reported bugs
4 issues- App crashes when selecting bullet or ammo
- Incorrect muzzle velocity and ballistic data
- Scope options not showing up for some users
- Weather data not loading properly
Requested features
4 requests- Ability to save multiple scope and ammo profiles
- Option to manually input barrel length
- Metric unit support
- Improved weather data integration
SIG BDX
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Nikon SpotOn
No in-app purchases
SIG BDX
No in-app purchases
Questions
Is Nikon SpotOn free?
Is SIG BDX free?
Which has better reviews, Nikon SpotOn or SIG BDX?
Do Nikon SpotOn or SIG BDX have ads?
Which is updated more often, Nikon SpotOn or SIG BDX?
Other comparisons
