# TallyRig: Well Control Calc — Oilfield Calcs + Saved History

> Oilfield Calcs + Saved History (iPhone/iPad app by 嘉炜 丰.)

- Source: https://appshunter.io/ios/app/tallyrig-well-control-calc/id6758645641 (this page in markdown: same URL + `.md`)
- Developer: [嘉炜 丰](https://appshunter.io/developer/1759511819)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 13.0 · 32 MB
- Languages: American English
- Released: 2026-03-09
- Data updated: 2026-09-04
- User reviews in markdown: https://appshunter.io/ios/app/tallyrig-well-control-calc/id6758645641/reviews.md

## What is TallyRig?

17 oilfield & drilling calculators — with a digital tally-book history.

TallyRig is a focused, field-ready calculator set for drilling and well control workflows. Run the essentials fast, save every result, and share a clean record when you need it.

DESIGNED FOR THE RIG
• Sunlight Mode: high-contrast screens you can read outside
• Glove-friendly: big targets, minimal tapping
• Offline-first: works without a signal
• Trust the math: review the formula / show-work for each result

17 FIELD CALCULATORS, ORGANIZED BY CATEGORY
• Well Control: Kill Sheet (Wait & Weight), Kick Tolerance, Gas Migration, Trip Fill, BOP Check (API Std. 53)
• Pressure: Hydrostatic, EMW from Pressure, ECD
• Fluids: Mud Weight-Up (barite), Slug, Cementing
• Tubulars: Pipe Tally, Buoyancy, Capacity, Stuck Pipe (Free Point)
• Hydraulics: Pump Output, Flow, Annular Velocity, Bottoms-Up
• Utilities: Oilfield Unit Converter

FIND TOOLS FAST
Search, category filters, and a drag-to-arrange dashboard so your most-used calculators are always on top.

HISTORY THAT'S ACTUALLY USEFUL
• Save any calculation to a clean history timeline
• Share a result card or a history record with your team
• Sync across devices via iCloud (when enabled)

UNITS
Switch between Imperial and Metric (SI) where supported.

WHO IT'S FOR
Drilling engineers, toolpushers, drillers, mud engineers, wellsite supervisors, and well control trainees who want a fast, reliable pocket reference.

IMPORTANT
TallyRig is a calculation aid for reference and cross-checking. Always verify inputs and outputs and follow your company procedures and training.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| TallyRig Pro | $14.99 | one-time |



## Version history (last 2 releases)

### 1.1.0 — 2026-06-30

TallyRig is now a 17-calculator oilfield suite.

• 13 new calculators since launch — Kick Tolerance, Hydrostatic, EMW, Hydraulics, ECD, Buoyancy, Capacity, Mud Weight-Up, Slug, Gas Migration, Trip Fill, Pipe Tally + a full Unit Converter
• New dashboard: search, category filters, and drag-to-arrange so your most-used tools stay on top
• Tougher, unit-aware math — every calculator is proven across Imperial and Metric
• Polished result views with show-work formulas, saved history, and one-tap share
• Bug fixes and performance improvements

Like TallyRig? A quick rating genuinely helps a small team keep building. Thank you.

### 1.0 — 2026-03-09

No release notes.

## Apps similar to TallyRig

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [WellCalc](https://appshunter.io/ios/app/wellcalc/id6761081416) | — | Free | Utilities |
| [Mud Man Pro](https://appshunter.io/ios/app/mud-man-pro/id6765783852) | 5.0 (1) | Free | Utilities |
| [Workover Assistant](https://appshunter.io/ios/app/workover-assistant/id1117692519) | 5.0 (2) | Free | Utilities |
| [Oilfield Drilling & Blast Calc](https://appshunter.io/ios/app/oilfield-drilling-and-blast-calc/id6762048533) | — | Free | Utilities |
| [DrillOut Calcs](https://appshunter.io/ios/app/drillout-calcs/id6754534235) | 5.0 (2) | Free | Utilities |
| [Oil & Gas Calculator : OilCalc](https://appshunter.io/ios/app/oil-and-gas-calculator-oilcalc/id6756295889) | — | Free | Utilities |

## More apps by 嘉炜 丰

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All apps by 嘉炜 丰: https://appshunter.io/developer/1759511819

## Related topics

[well control](https://appshunter.io/ios/topics/well-control) · [well control tool](https://appshunter.io/ios/topics/well-control-tool)

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*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 2026-09-04.*