Virtual Flange Slide Rule vs Drill Collar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Virtual Flange Slide Rule
Access essential measurements and dimensional data for API 6A integral flanges. This tool provides quick access to critical specifications for engineering and industrial applications.
- API 6A integral flange data
- Relevant measurements
- Dimensional data access
- Engineering specifications
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Valveworks USA presents the Virtual Flange Slide Rule. This application gives you access to all the relevant measurements and dimensional data for the API 6A integral flange.
Drill Collar
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Drill Collar app is database of Ideal Drill Collar Range. When select Open Hole Size, the app will show below data: - CASING SIZE TO BE RUN, inch - IDEIAL DRILL COLLAR RANGE, inch - API DRILL COLLAR SIZES WHICH FALL IN THE IDEAL RANGE, inch The minimum size drill-collar is calculated from the Lubinski and Hock equation. Easy. Simple. Useful. Work Safe!
Screenshots
Verdict
The clearest difference is price: Virtual Flange Slide Rule at Free against Drill Collar's $0.99. Virtual Flange Slide Rule also leads on update cadence (every 4 months vs every 36 months) and device support (3 vs 1). On ads, in-app purchases 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
Virtual Flange Slide Rule is free to download; Drill Collar costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Virtual Flange Slide Rule ships an update every 4 months, Drill Collar every 36 months. The most recent releases landed on October 2, 2026 and October 8, 2026 respectively.
| Parameter | Virtual Flange Slide Rule | Drill Collar |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 5.0 (13 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 13 — better | — |
| Update frequency | Every 4 months — better | Every 36 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 3 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | American Certified Equipment, Inc. | zhandos uakanov |
In-app purchases
Virtual Flange Slide Rule
No in-app purchases
Drill Collar
No in-app purchases
Questions
Is Virtual Flange Slide Rule free?
Is Drill Collar free?
Do Virtual Flange Slide Rule or Drill Collar have ads?
Which is updated more often, Virtual Flange Slide Rule or Drill Collar?
Other comparisons
