TallyRig: Well Control Calc
Oilfield Calcs + Saved History
About
This app provides a suite of 17 oilfield and drilling calculators designed for field use. It features a digital tally-book history to save and share results, with offline functionality and a user-friendly interface for rig environments. Supports multiple languages and unit systems.
What's New in TallyRig
1.2.0
September 8, 2026
TallyRig now speaks your language. • Português (Brasil) and Español — the whole app, not just the menus. Switch any time in Settings → Language; new installs follow your device language. • Guided first-run setup for new installs: your role, your rig's units and your most-used tools, configured in under a minute. Updating? Your existing settings and Pro unlock are untouched. • Smarter units: changing a unit in Settings now converts your entered values instead of clearing them — the physical quantity is preserved. • Made for iPad: layouts adapt to the bigger screen instead of stretching. • Cementing formula display fixed in metric yield units, plus stability and polish. Still 8 calculators free, forever.
MoreSubscriptions & In-App Purchases
$14.99
TallyRig Pro
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FAQ
What is TallyRig used for?
TallyRig is a calculation aid for reference and cross-checking in oilfield and drilling operations. It offers 17 specialized calculators for tasks like well control, pressure, fluids, tubulars, and hydraulics.
Does TallyRig work offline?
Yes, TallyRig is designed to be offline-first, meaning it works without a signal. This makes it reliable for use in remote or underground rig environments where connectivity may be limited.
Can I save and share calculations with TallyRig?
Yes, TallyRig allows you to save any calculation to a clean history timeline. You can then share a result card or a complete history record with your team.
What languages does TallyRig support?
TallyRig offers full in-app translation in English, Portuguese (Brazil), and Spanish. This includes all calculators, result views, and formula labels, which can be switched in the settings.
Is TallyRig suitable for outdoor use?
Yes, TallyRig includes a Sunlight Mode with high-contrast screens specifically designed for readability in outdoor conditions. The interface also features big targets and minimal tapping for glove-friendly operation.
How often is TallyRig updated?
The latest version of TallyRig is 1.2.0, which was last updated on September 8, 2026. Updates typically include improvements and new features based on user feedback and industry standards.
What devices can I use TallyRig on?
TallyRig is available for iPhone and iPad devices. It is designed to be a portable and convenient tool for professionals in the oilfield.
Does TallyRig have ads?
No, TallyRig does not contain advertisements. As a free application, it focuses on providing a clean and uninterrupted user experience for its specialized calculations.
