By Igor Borisov

  • Category: Utilities
  • Release Date: 2009-06-17
  • Current Version: 3.72
  • Adult Rating: 4+
  • File Size: 13.99 MB
  • Developer: Igor Borisov
  • Compatibility: Requires iOS 8.0 or later.
Score: 3.5
From 473 Ratings


iStrelok is a ballistic trajectory calculator. - 773 reticles supported! Full list see here: - You can see holdovers on your reticle and scale holdovers to any magnification (if reticle is located in second focal plane). - Trajectory calibration ("Truing") feature. - abitity to change target type and select from: Round target (you can change diameter), Old IPSC Target, IPSC Target, IPSC Universal Target, IPSC Mini Target, IPSC A4 Target, IPSC A Target, Target number 4. And animals targets: Fox, Coyote, Wild Boar, Aoudad, Crow, Moose, Elk, Whitetail Deer, Rabbit, Rat, Pingeon, Marmot. - ability to input current altitude from internal GPS sensor - supports WeatherFlow WINDmeter (not WEATHERmeter) - iPhone internal barometer support Small, handy and accurate. Field-proven accuracy since 2001. Supports imperial units (yards, feet, inches, etc).



  • Good but go pro

    By Dung refuge
    This is a good app but my data is off for two of my rifles. Collected all the data I could and triple checked everything but the app didn’t match what I needed on my rifle to hit. My friend had the pro version with the G7 bullet ballistics. He plugged in the same data and the pro gave him what I had dialed in my rifle.
  • Great app

    By colohunter9
    Lots of reticles and accurate ballistics. I wouldn’t mind seeing an impact29 reticle from leupolds vx5 riflescope though
  • Great ballistics program and a responsive software developer

    By Bikerbob52
    Love the app and use it all the time for hunting. Simple and accurate with lots of features to customize ammunition, targets, and compensates for differing environmental conditions from zeroing conditions. The developer is very responsive to my requests for adding new reticles. I don’t know how well this will work for super long range bench rest shooters but it is a great tool for all of your practical hunting and sighting needs.
  • Disappointed

    By 308 pilot
    I have Strelock Pro and decided to spend the $5 to have iStrelock. I have to say I'm more than a bit disappointed. No bullet database, trajectory calibration is lame, moving target, and a few others. Just a little redecorating with the layout. Not worth the money. It's more of a lite version. The more I use it the more upset I am that I got it. Igor flopped on this one. No kidding I don’t need iStrleock. It appeared to have to couple more features than the other but I was WRONG!
  • Lots of potential

    By Hawgwild23
    The architecture of this app is great. However, I compared results of various load and calibers to some name brand site calculators. When it came to a .223 Federal Fusion 62 gr., it failed to calculate properly. I compared it to Federal and Winchester calculators and it was wrong. Federal and Winchester was almost identical. Anyone would love a cartridge like this app shows. I email the developer more than once and sent him the data. He said he found no problem.
  • Ballistic AE better

    By Shytbyrd
    This is an ok app, and it does work as advertised. That said, I’ve contacted Igor several times to inquire about giving the user the option to choose what outputs the user wants to see. I personally use MRAD only, and do not want to see the values for MOA or clicks - this just clutters up things showing useless data. Also leaves room for mistakes. For a couple of years I’ve been told that he would look into it and update the app - this is just lip service. Ballistic AE is a better app and only outputs the data you want.
  • Very Helpful App

    By Yamaha50th
    I would recommend this app for anyone starting to shoot long range and learning their scope reticle a bit more. I was telling my friend about this app but I do not see his scope in the list (Firefield 8-32x50) Would it be possible to add it??
  • Absolutely necessary for Precision Rifle Shooters

    By n.gardner
    As a PRS shooter this app is phenomenal. I have used this app in several long range matches at various ranges across America. If you have a precision long gun, you need this app. Don’t forget to change your weather!!! SGT_G
  • Latest version crashes

    By chsanders
    I’ve been very happy with the app up until this newest update. Everything seems to work except when I try look at the reticle and then it crashes.
  • Great App

    By ZSpicy
    Great app, works as it should. It's missing a few reticles. The biggest one I noticed is the 1-8 trijicon. That scopes pretty new though so hopefully it's updated soon. Update: Developer responded and added reticle I noted above. With such a responsive developer, the app is with every penny. Thank you!