Directional Drilling Calc. vs Quail Tools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Directional Drilling Calc.
This application provides essential calculations for directional drilling in oil and gas exploration. It offers multiple methods for calculating directional drilling data and dogleg severity between survey points. Designed for ease of use, it supports professionals in the field.
- Angle Averaging Method
- Radius of Curvature Method
- Balanced Tangential Method
- Minimum Curvature Method
- Tangential Method
- Dogleg severity calculation
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Oilfield Directional Drilling Calculation is for anyone involved in Oil and Gas exploration and drilling. This application is an essential supporting tool. From this application You can easily find out any directional drilling data. Directional Drilling Calculation: - Angle Averaging Method - Radius of Curvature Method - Balanced Tangential Method - Minimum Curvature Method - Tangential Method - Calculate dogleg severity between 2 survey points based on Radius of Curvature Method - Calculate dogleg severity between 2 survey points based on Radius of Tangential Method App is very simple, easy to use. Good Luck in Your Job!
Quail Tools
Access essential specifications for Tubulars, BOPs, and API Casing offline. View detailed data like tool joint OD, make-up torque, and pressure ratings. Share spec sheets when an internet connection is available.
- Offline access to Tubular and BOP specs
- API Casing General Information table
- Detailed spec sheets for equipment
- Shareable spec sheets (online)
- Save spec sheets to device
- Tool joint OD, ID, torque, tensile
- BOP pressure rating, bonnet type, operating data
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The app allows users to select Tubulars or BOPS to view specs. Users will also have access to our newly added API Casing General Information table. The initial page will allow the user to select between three sections of the app: Tubulars, BOPs, or Casing. Upon selecting "Tubulars" or "BOPs, the user will be presented with a built in table that contains essential information. Therefore, it does not require an internet connection to function! This will allow for constant, unhindered access to tubular and BOP information such as: tool joint OD, tool joint ID, max make up torque, premium tensile, BOP height, BOP weight, BOP pressure rating, BOP bonnet type, BOP operating data, and BOP shear testing videos. Upon selecting the "API Casing - General Information" button, the user will have access to a built in table containing standard API casing information. You can now view essential specs in areas where there is little or no cell phone reception. When selecting "Tubulars" or "BOPs", simply tap the item to view the spec sheet. This retrieves the spec sheet from our website, which can be shared using the button on the top right. (Please note: this function does require an internet connection). From there, the spec sheet can also be saved to your phone, or any handled via another app. We hope you enjoy this app as much as we have. Please feel free to provide feedback via the contact us button in the app.
Screenshots
Verdict
The clearest difference is review sentiment: Quail Tools at 100% against Directional Drilling Calc.'s 0%. Quail Tools also leads on price (Free vs $0.99) and rating (5.0 vs 1.0). On ads, in-app purchases, device support and iOS requirement 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
Quail Tools is free to download; Directional Drilling Calc. costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Quail Tools holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: Quail Tools has 22 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 0% of Directional Drilling Calc.'s written reviews are positive against 100% of Quail Tools's.
Directional Drilling Calc. ships an update every 82 months, Quail Tools every 5 weeks. The most recent releases landed on September 4, 2026 and June 1, 2026 respectively.
| Parameter | Directional Drilling Calc. | Quail Tools |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 1.0 (4 ratings) | 5.0 (22 ratings) — better |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 4 | 22 — better |
| Update frequency | Every 82 months | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 13.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 50 MB |
| Age rating | 4+ | 4+ |
| Developer | zhandos uakanov | Austin Angelle |
Customer experience
Directional Drilling Calc.
Quail Tools
In-app purchases
Directional Drilling Calc.
No in-app purchases
Quail Tools
No in-app purchases
