On-device, offline-first
Calculations run locally, in native Rust on Android and as WebAssembly in Chrome and on the web. The apps work without a connection and need no account, and calculation inputs are never sent anywhere.
CoreVecta LLC
CoreVecta builds offline-first calculation software: calculator apps for Android and Chrome, and a free calculator library on the web. Every number on screen comes from a verified calculation engine running on your device, and your inputs and results never leave it. No accounts, no ads, no tracking.
How CoreVecta software works
The same three rules hold across everything we ship. They are engineering constraints, not slogans; the trust page spells out what we do not claim.
Engine-verified numbers
Every displayed result is computed by a tested calculation engine and shown with its formula and inputs, so you can check the math. When an honest answer is not possible, the software says so instead of guessing.
Signed knowledge packs
Formulas, reference tables and rates ship as versioned, cryptographically signed packs. An app verifies a pack's signature before opening it, so the data you compute with is exactly what was published.
First-wave apps
Four calculator apps make up the first wave. The status badge on each card reflects the catalog as it actually stands, and each app's page lists its packs, pricing and questions in full.
ConvertVecta Convert anything - units, time zones, calendars, money, code Ask in plain English and convert anything - “how many ml in 2 cups”, “3pm Karachi to Los Angeles”, “350 °F to °C”. A chat-first, fully on-device conversion atlas: 170 categories and 3,651 units, a DST-correct world clock, 11 calendars, coordinates, colour, encodings and size charts - with premium interactive instruments. No accounts, no ads, no tracking; calculations run locally and the optional Pro purchase uses the network only for purchase verification, restore, and refund enforcement.
FinanceVecta A finance calculator that shows its formulas Time value of money, NPV, IRR, XNPV, XIRR, bond pricing, Black-Scholes options, depreciation, tax estimates and break-even analysis - a full finance calculator that shows its work, on your device. Every result comes with its formula and inputs, so you can check the math instead of trusting a black box. No accounts, no network, no tracking. Informational only - not financial or tax advice.
ConstructionVecta A construction estimator with reference code checks Slab volume, stair risers, framing counts and cost breakdowns - a construction estimator that checks against code (IRC stair rise/run, ADA ramp slope) and shows its source for every number. Every estimate comes with a trace: the formula, the code reference, and the pack it drew from. The code checks are a reference aid, not a compliance determination - verify against the adopted code and your local authority. Runs offline, no ads, no tracking.
EnergyVecta An energy calculator that shows its work Electricity bills from your tariff, appliance and standby costs, EV charging, generator fuel, UPS backup time, solar sizing and battery storage - 276 engine-verified calculators across ten signed packs, fully on your device. Scrub any input and watch every result update live, reverse-solve to the answer you want, and open any result to see the formula, the pack version and how sensitive it is to each input. No accounts, no ads, no tracking. Preliminary sizing reference - verify with a qualified installer or engineer.
Atlas: free online calculators
Atlas is CoreVecta's free calculator library on the web, covering finance, construction and energy: mortgage and loan math, concrete and framing estimates, electricity and solar sizing, and more. Each calculator page pairs the working tool with a plain-language explanation of the method, and the numbers come from verified calculation engines, the same engineering that powers the apps. There is nothing to install and no account to create.
Insights
Why Offline Expert / OEP: The primary executive series: regulated AI, controlled knowledge, evidence chains, deployment boundaries, signed packs, and controlled expert runtimes. Articles publish on this site first; the LinkedIn newsletter editions link back. Read the series.
Company
- Legal name
- CoreVecta LLC
- Jurisdiction
- Wyoming, USA
- Website
- https://corevecta.com
Public developer contact details must match the verified details entered in Google Play Console.
Policies and contact
Privacy Policy How app data, purchase processing, and local storage are handled. Terms of Use License, Pro upgrade, dated packs, refunds, and disclaimers. Security Security reporting, scope, safe harbor, and response targets. Support & refunds How to reach support, and the refund policy for Pro and packs.