# Kyanite Pro — Drilling calculators offline > Offline drilling and mud engineering calculators for oilfield professionals. (iPhone/iPad app by Mike Haynes.) - Source: https://appshunter.io/ios/app/kyanite-pro/id6802395850 (this page in markdown: same URL + `.md`) - Developer: [Mike Haynes](https://appshunter.io/developer/6802395852) - Category: Utilities, Productivity - Price: Free with in-app purchases (on sale, was $12.99) - Rating: 5.00/5 from 1 App Store ratings - Age rating: 4+ - Requires: iOS 18.0 · 40 MB - Languages: American English - Released: 2026-08-26 - Data updated: 2026-09-12 - Monetization: freemium - User reviews in markdown: https://appshunter.io/ios/app/kyanite-pro/id6802395850/reviews.md ## What is Kyanite Pro? A professional calculation and reference tool for the people who run the well: drilling and mud engineers, solids control hands, cementers, directional drillers and MWD hands. The calculators work completely offline. No ads and no tracking, and no account is needed to use them. You only sign in if you want to share records with your crew. FREE TO START The scientific calculator, field notes, reference charts, volume tables and the hitch calendar are free, along with the full calculator catalog so you can see what you are paying for. KYANITE PRO Unlocks the 120+ field calculators, kill sheets, cement job sheets, LCM build sheets, location volumes and chemical inventory. Start with a 3-day free trial, then $3.99 per month or $19.99 per year. It all keeps working with no signal. SHARE WITH YOUR CREW Keep one set of figures in front of everybody on location. Share tank gauge readings, chemical inventory, notes, LCM build sheets, kill sheets and cement jobs with the hands you work with, and every phone stays in step. Anything you enter with no signal goes up as soon as you have coverage, and your own records stay private until you choose to share them. 120+ CALCULATORS Drilling engineering: capacities, volumes, string displacement, pump output and strokes, circulation times, hydrostatic, gradient, EMW, ECD, MAASP, lag time and ROP. Drilling fluids: mud weight conversions, oil/water ratio, weighted mixing, barite and hematite addition, dilution, PV, YP, gel strength, API fluid loss, retort solids and alkalinity. Solids control: solids percentage, low and high gravity solids, dilution and discard volume, screen mesh, centrifuge and hydrocyclone. Cementing: slurry yield and density, mix water, additives by percent BWOC, sacks, annular volume with hole excess, top of cement, balanced plug, displacement and strokes. Directional and MWD: minimum curvature, dogleg severity, interpolation, closure and vertical section, build and tangent sections, projections ahead, slide footage and toolface. Well control: formation pressure from SIDPP, kill mud weight, initial and final circulating pressure, the step-down schedule, maximum allowable mud weight from a leak-off test, MAASP, influx height and gas expansion. KILL SHEET A full IADC-style vertical well kill sheet you fill in before you need it. Keep the pre-recorded half current on a quiet tour; if the well is shut in, enter SIDPP, SICP and pit gain and the sheet works the kill with a full step-down schedule. CEMENT JOB SHEET Lay out a primary job end to end: capacities, coverage, barrels, sacks and mix water, the annulus drawn to scale, and a pump schedule with cumulative strokes. Casing presets from 20 to 4-1/2 inch. LCM BUILD SHEET Design a lost circulation pill product by product from your own inventory. Pounds, sacks, concentration and cost per barrel, a stock check against what is on hand, and one tap to record it as used. CHEMICAL INVENTORY A real daily ledger: previous, received, used, transferred in and out, and adjustments for every product, every day. Tomorrow starts where today finished and historical days are never overwritten. BUILT FOR THE FIELD Large touch targets and big monospaced results, readable in gloves and in the sun. Dark and light mode, favorites and search. ENGINEERING INTEGRITY Every calculator shows its equation, units, assumptions and a verification status: VERIFIED, NEEDS VERIFICATION or EQUIPMENT SPECIFIC. IMPORTANT Kyanite Engineering is a calculation and reference aid, not a well control program and not a substitute for engineering judgement. All results must be verified by qualified personnel. Well control decisions must follow the operator's and contractor's program and the person in charge on location. Subscriptions renew automatically unless cancelled at least 24 hours before the period ends. Terms: https://qd9gebwlsmhsi73ipf973-web-kyanite-support.rork.live/terms Privacy: https://qd9gebwlsmhsi73ipf973-web-kyanite-support.rork.live/privacy ## Key features - Offline drilling calculators - Mud, cement, and directional drilling tools - Field notes and reference charts - Crew data sharing - Kill sheet and cement job sheet - Chemical inventory management ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | Kyanite Pro Monthly | $3.99 | per month | | Kyanite Pro Yearly | $19.99 | per year | ## Frequently asked questions about Kyanite Pro ### Does Kyanite Pro have ads? No, Kyanite Pro is ad-free. The description explicitly states 'No ads and no tracking' for all features, including those in the free tier and the premium subscription. ### What is the pricing for Kyanite Pro? Kyanite Pro offers a free starting tier with essential tools. The full version unlocks over 120 field calculators and job sheets with a 3-day free trial, followed by a subscription of $3.99 per month or $19.99 per year. ### Can I use Kyanite Pro without an internet connection? Yes, all calculators and features in Kyanite Pro work completely offline. Data syncs with your crew only when you have a signal, ensuring continuous usability in remote locations. ### What kind of calculators are included in Kyanite Pro? Kyanite Pro includes over 120 calculators covering drilling engineering, drilling fluids, solids control, cementing, directional drilling, MWD, and well control. Specific tools include capacities, volumes, mud weight conversions, slurry yield, dogleg severity, and kill sheets. ### How does Kyanite Pro help with crew collaboration? You can share records like tank gauge readings, chemical inventory, notes, LCM build sheets, kill sheets, and cement jobs with your crew. This ensures everyone on location has the same up-to-date figures. ### What is the update frequency for Kyanite Pro? The app was last updated on September 11, 2026, with version 1.2.2. This indicates active development and regular updates to improve functionality and add new features. ### Is Kyanite Pro suitable for beginners? While designed for professionals, the free tier offers basic tools and the full calculator catalog is available to view before subscribing. This allows users to explore the app's capabilities before committing to a paid plan. ### What devices support Kyanite Pro? Kyanite Pro is available for iPhone and iPad, making it accessible to a wide range of mobile users in the field. ## Version history (last 3 releases) ### 1.2.2 — 2026-09-11 Announcements Home can now show a short note from us when something new ships, like a new calculator or a fix you asked for. Tap it to read the whole thing, or dismiss it and it is gone for good on that phone. No ads, no offers, no links out, and it works whether or not you have an account. Fixed Tanks, products and sheets shared with a crew would not delete. Deleting one now clears it off every phone on the crew the way it always should have. Adding a tank or a tank group while a crew is selected also saves it to that crew instead of quietly filing it under your own records. Everything else is unchanged: the calculators, charts and sheets still run with no signal and no login. ### 1.2.1 — 2026-09-07 The app is now called Kyanite Pro, with a new Texas oilfield app icon. The app itself stays free to download. Location Volumes now sync reliably between crew phones — tanks, daily gauge readings and tank groups all push and pull correctly. Updated the support contact address. ### 1.2.0 — 2026-08-26 No release notes. --- *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 2026-09-12.*