WindFX vs SIG BDX
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WindFX
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For all the activities related to the use of the wind (sailing, paragliding, ...) the analysis of the weather makes it possible to choose each day the most favorable site or sites according to their characteristics: type, orientations of the wind, minimum speed ... Today this analysis of the weather forecast requires to consult several websites or dedicated apps and to decide according to our knowledge of the sites. However the more the number of sites increases the more it becomes complicated. In addition we often have one or more local sites for which we want to know frequently if the weather conditions are consistent with the activity. In that case the choice of site can be done at the last minute since they are nearby. But for remote sites that require a car(plane) trip we want to be informed in advance. The purpose of WindFX is to facilitate and automate this analysis of the weather forecast and to quickly present for a selected period the favorable site (s) according to previously defined choice criteria. WindFx is universal and can be used by a windsurfer as well as a paraglider. Only a few criteria like the speed range are different between windsurfing and paragliding. Here are some examples of research: -what are the favorable sites for this weekend in a radius of 100km? -which is the optimum planning for the next 5 days,... WindFX is useful with all activities in which the direction and strength of the wind are to be taken into account. -all seaside water sports: kitesurfing, windsurfing, sand yachting ... -all free flight activities: paragliding, hang gliding, .. -All activities of radio controlled flight: plane, glider, drone, slope, ...
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 price: SIG BDX at Free against WindFX's $1.99. SIG BDX also leads on update cadence (every 3 weeks vs every 4 months). WindFX's advantage is iOS requirement (12.0 vs 16.0). On ads, in-app purchases 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
SIG BDX is free to download; WindFX costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
WindFX ships an update every 4 months, SIG BDX every 3 weeks. The most recent releases landed on September 24, 2026 and October 14, 2026 respectively.
| Parameter | WindFX | SIG BDX |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | — | 3.4 (68 ratings) — better |
| Positive reviews | — | 33.3% of reviews |
| Number of ratings | — | 68 — better |
| Update frequency | Every 4 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 1 MB | 137 MB |
| Age rating | 4+ | 4+ |
| Developer | pyd.app | Sig Sauer, Inc. |
In-app purchases
WindFX
No in-app purchases
SIG BDX
No in-app purchases









