# SIG BDX — SIG Ballistic Data Xchange > Connects rangefinder to riflescope for illuminated holdover dot aiming. (iPhone/iPad app by Sig Sauer, Inc..) - Source: https://appshunter.io/ios/app/sig-bdx/id1403025894 (this page in markdown: same URL + `.md`) - Developer: [Sig Sauer, Inc.](https://appshunter.io/developer/1114396362) - Category: Sports, Entertainment - Price: Free - Rating: 3.50/5 from 65 App Store ratings · 41 written reviews indexed - Age rating: 4+ - Requires: iOS 16.0 · 135 MB - Languages: American English - Released: 2018-08-05 - Data updated: 2026-08-27 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/sig-bdx/id1403025894/reviews.md ## What is SIG BDX? 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 ## Key features - Sync rangefinder with riflescope - Display illuminated holdover dot - Measure target distance - Ballistic data integration - Connect The Dot™ system ## Recent user reviews (10 of 41) All indexed reviews: https://appshunter.io/ios/app/sig-bdx/id1403025894/reviews.md ### 1/5 — Time not synching on Echo MV50 *2026-03-13* Time is off by about 13 hours on the monocular and the only way to sync it is through the app. Called customer service and was told they’re aware and engineers are working on it and just wait for a possible update with no time frame. Not sure why it can’t be fixed for such an expensive piece of equipment. ### 5/5 — Currently no bugs for me *2026-02-17, version 459* Right now the App is awesome to use. I pair it with some HDX Kilo6K binoculars and have not had an issue for a while. Initially the app had to be synced with my binoculars for the binoculars to get the correct temperature or else it would default to -18°C and that could throw my shot off by one or two tenths of a MIL. The app updated my binoculars just fine and I have not seen the -18° glitch since 🙏🤞 and it’s been over six months. I do wish I could plug in values on the ballistics page without needing to be Bluetooth connected to a device. ### 4/5 — 300 PRC *2026-02-13* I love the combo and have no issues at all. Only wish there was more options for ballistics instead of having to enter in the caliber and all the info. I mainly use a 300 PRC and 450 BM. ### 1/5 — Time not synching on Echo MV50 *2025-12-30* Time is off by about 13 hours on the monocular and the only way to sync it is through the app. Called customer service and was told they’re aware and engineers are working on it and just wait for a possible update with no time frame. Not sure why it can’t be fixed for such an expensive piece of equipment. ### 3/5 — It’s ok *2025-12-22, version 455* Seams to be a bit female as sometimes it works well other times not at all frustrating come on it guys please sort it out cheers ### 1/5 — Trash *2025-11-30, version 454* The app is awful compared to others like AGM and ATN. The live stream feature needs work. It’s slow and unreliable. ### 2/5 — App needs a lot of work *2025-07-26* This app is slow, lots of latency when streaming from a device three inches from the phone, it has no firmware update release notes and does not give Echo CV25 owners any alternate ballistic reticle choices. It is buggy when trying to download images or movies from the optic and does not offer thumbnails, kind of a basic third world app. ### 2/5 — fix this app *2025-06-10* for the love of god, modernize this UI, and fix longstanding bugs. it diminishes your hardware products. and have the pin drop automatically in onx hunt instead putting me in compass mode! ### 2/5 — Could be worse *2025-03-27* Sig, ‘doing Sig things’ could absolutely be worse by going ‘Full Sigtard-Heil’ and doubling-down in spamming in-app “Your P320 Will NOT Drop Fire No Matter How OFTEN Brandon Herrera Tells You It WILL” ad spots… Are you literally ALL SADOMASOCHISTS?!?! ### 1/5 — App is junk. *2025-01-18* Have a CV25 Thermal, app barely recognizes it, doesn’t allow me to retrieve videos or configure the device. JUNK. ## Frequently asked questions about SIG BDX ### What does the SIG BDX app do? The SIG BDX app connects your KILO BDX rangefinder to your SIERRA3BDX riflescope. It allows you to sync these devices and then displays an illuminated holdover dot directly in your riflescope, indicating the precise aiming point for your target. ### How does the 'Connect The Dot™' feature work? Once your rangefinder and riflescope are synced and paired, you simply press the RANGE button on your rangefinder to measure the distance to your target. The app then transmits this data, and the riflescope's reticle will illuminate the exact holdover dot needed for an accurate shot, up to 800 yards. ### Is there a cost to use the SIG BDX app? Based on the provided information, the SIG BDX app is available for free. There are no mentioned costs associated with downloading or using its core functionalities. ### What is the accuracy and range of the BDX system? The BDX system, when used with a paired KILO BDX rangefinder and SIERRA3BDX riflescope, offers 1 MOA of accuracy out to 800 yards. The riflescope's power selector ring will show a solid blue LED when actively paired and flash when a new holdover reticle update is received. ### What devices are compatible with the SIG BDX app? The SIG BDX app is designed to work with SIG KILO BDX rangefinders and SIERRA3BDX riflescopes. It facilitates the bonding process between these specific devices to enable the illuminated holdover dot feature. ## Version history (last 5 releases) ### 462 — 2026-07-01 - Fix for the Profile Editor page when using a Bravo6 ### 461 — 2026-04-13 Added thumbnails, a previously downloaded indicator, and the ability to delete ECHO 6 and ECHO MV, RV, and RQ photos and videos, and added new ECHO RQ and RV firmware files. ### 460 — 2026-03-06 Firmware update for the ECHO RV35, RV50, and RQ35. Additionally, WiFi problems on iOS 26 have been fixed. ### 459 — 2026-02-10 Update to the Bravo6T page ### 458 — 2026-02-04 ECHO MV50 firmware update ## Apps similar to SIG BDX | App | Rating | Price | Category | | --- | --- | --- | --- | | [Applied Ballistics Connect](https://appshunter.io/ios/app/applied-ballistics-connect/id1425018283) | 4.7 (3) | Free | Sports | | [Chairgun Elite Ballistic Tool+](https://appshunter.io/ios/app/chairgun-elite-ballistic-tool-plus/id1575685449) | 4.5 (393) | Free | Sports | | [Ballistic Calculator SBC Light](https://appshunter.io/ios/app/ballistic-calculator-sbc-light/id1450771572) | 4.6 (6,304) | Free | Sports | | [AB Quantum](https://appshunter.io/ios/app/ab-quantum/id785619104) | 4.7 (2,569) | Free | Sports | | [Kestrel LiNK Ballistics](https://appshunter.io/ios/app/kestrel-link-ballistics/id1059522399) | 2.8 (60) | Free | Sports | | [Ballistic X](https://appshunter.io/ios/app/ballistic-x/id1441335342) | 3.7 (140) | $7.99 | Sports | ## More apps by Sig Sauer, Inc. - [KILO2400ABS](https://appshunter.io/ios/app/kilo2400abs/id1114396363) - [SIG CONNECT](https://appshunter.io/ios/app/sig-connect/id1672417146) - [SIG Credit](https://appshunter.io/ios/app/sig-credit/id6737066638) All apps by Sig Sauer, Inc.: https://appshunter.io/developer/1114396362 ## Related topics [sig sauer bdx](https://appshunter.io/ios/topics/sig-sauer-bdx) · [sig sauer](https://appshunter.io/ios/topics/sig-sauer) · [sigconnect](https://appshunter.io/ios/topics/sigconnect) · [shotstat](https://appshunter.io/ios/topics/shotstat) · [precision rifle](https://appshunter.io/ios/topics/precision-rifle) · [innotech](https://appshunter.io/ios/topics/innotech) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*