Every tool you reach for.
One app. Offline.
200+ unit conversions, live currency and crypto, world clocks, a scientific calculator, stopwatch, GPS, electronics formulas, sun position and a worldwide size guide — on iPhone, iPad and Apple Watch.
Built for real work
Precise where it counts, instant everywhere else
Every calculation runs on your device. Only live rates and weather touch the network — and the last values stay cached for when they can't.
Convert
200+ units across 18 categories
Length, weight, temperature, volume, speed, area, time, data, energy, pressure, angle, torque, frequency, density, fuel economy and power — each conversion routed through a base unit so results stay exact.
- Instant multi-unit strip under every result
- Favourites and full history, kept on device
- Voice entry — speak the number, on-device
Calculate
A calculator that keeps its receipts
Scientific functions, undo and redo, adjustable precision, and a context-aware percent key — 200 + 10% gives 220, not 0.1. Every result lands in a history you can scroll back through.
- sin · cos · tan · log · √ · xʸ · π · e
- Undo, redo, and auto or fixed precision
- Hand a converted value straight to the keypad
Time
Stopwatch, countdown, interval
A centisecond dial with unlimited laps, a countdown that survives backgrounding, and interval training with HIIT, Tabata, Pomodoro, EMOM and Boxing presets ready to go.
- Laps stay accurate while you scroll or switch apps
- Export a session as CSV from the share sheet
- A Live Activity keeps the timer on the Lock Screen
Field tools
Ten electronics calculators, and the sky
Ohm's law, power, resistor and capacitor colour codes, LED series resistors, battery life, resistor networks, decibels, wire gauge and voltage dividers — plus sun azimuth, elevation, golden hour and twilight for wherever you are standing.
- Every calculation saved to a per-tool history
- Compass with Qibla bearing and a calibration warning
- GPS in decimal, DMS and UTM — copy it or drop a pin
The full kit
Everything in the dock
Tap any tool from the bar that follows you down the list. No menus to dig through.
Privacy by construction
Nothing to opt out of
UltraConvert has no account, no analytics SDK, no advertising network and no tracking identifier. There is no server holding your data, because there is no server.
Your data stays put
Conversions, favourites, history, saved pins and measurements live on your device. iCloud sync, if you use it, is Apple's private key-value store — we have no access.
Location is used, never stored
Approximate coordinates go to Open-Meteo to fetch a forecast and to drive the compass. We never receive or log them, and you can revoke access in Settings at any time.
Voice stays on device
Where the hardware supports on-device recognition, spoken numbers never leave your iPhone. Nothing is recorded and nothing is kept.
Offline is the default
Every unit conversion, calculation and formula works with no connection at all. Rates and weather simply serve their last cached values.
Across your devices
iPhone, iPad, Watch and widgets
One free download covers all of them, and they share your language and history through a private App Group.
iPhone
Portrait-locked, one-handed reach, Dynamic Type all the way up to the accessibility sizes.
iPad
A native layout in both orientations — wider lists, a centred dock and world clocks pinned to the header.
Apple Watch
Quick conversions with the Digital Crown, plus calculator, timer and compass on your wrist.
Widgets
Home Screen and Lock Screen families for rates, crypto, weather and world clocks.
Worldwide
Fully translated into 18 languages
Not just the buttons — permission prompts, the Watch app, the widgets and every legal text. Arabic is laid out right to left throughout. The app opens in your device's language automatically and falls back to English when it is not one of these.
Good to know
Questions, answered
Free, and it stays that way
No subscription, no in-app purchase, no ads. Download it once and every future update comes with it.
Download on theApp StoreRequires iOS 17.0 or later · iPhone, iPad and Apple Watch
Privacy Policy
Last updated: August 2026
Location
Your location is used for local weather and the compass. Approximate coordinates are sent to Open-Meteo to fetch a forecast; they are never linked to an identity and never stored by us. The compass runs entirely on your device. You can revoke access in iOS Settings at any time.
Camera, microphone and calendar
The camera is used only to switch on the flashlight — no image is captured or recorded. The microphone opens only while you are using voice entry, to write a spoken number into the field. On devices that support it, recognition happens entirely on-device; otherwise iOS processes it under Apple's privacy policy. Nothing is recorded or retained. Calendar access is requested only when you add a meeting.
Third-party services
UltraConvert requests public data from the sources below. Only what the request needs is sent — coordinates for weather, nothing personal for the rest. There is no account, no sign-in and no advertising network.
- Open-Meteo — weather forecast
- open.er-api.com — currency exchange rates
- CoinGecko — cryptocurrency prices
- gold-api.com — precious metal prices
- flagcdn.com — country flag images
Your data and your rights
Everything you create — conversions, favourites, history, saved pins and measurements — stays on your device. iCloud sync, when enabled, uses Apple's private key-value store, which we cannot access. We operate no server and hold no copy of your data, so there is nothing for us to hand over, correct or delete. To erase everything, delete the app or clear its data from inside the app. Your rights under GDPR and CCPA are fully preserved; you exercise them on your own device and through Apple.
No tracking
There is no analytics SDK, no advertising identifier (IDFA), no cross-app tracking and no App Tracking Transparency prompt — because there is nothing to track.
Children
UltraConvert is safe for all ages. It collects nothing and contains no social features, no user-generated content and no purchases of any kind.
Changes and contact
If this policy changes in a way that affects you, the date above changes and the new text ships with an app update; no change is applied retroactively to data already on your device. Questions:
Terms of Use
Last updated: August 2026
Licence
UltraConvert is licensed, not sold, to you under Apple's Licensed Application End User Licence Agreement (the standard EULA), for personal or commercial use on Apple devices you own or control. You may not redistribute, resell, reverse-engineer or extract parts of the app.
Accuracy and intended use
Conversions and formulas are implemented carefully and covered by an automated test suite, but they are tools, not certified measurements. Exchange rates, crypto prices, metal prices and weather come from third parties and can be delayed or wrong. Compass headings, GPS coordinates and sun times depend on your device's sensors and can drift. Do not rely on the app alone for navigation, medical, financial, legal, structural or any other safety-critical decision — always verify against an authoritative source.
Third-party data
Live data is fetched from independent providers who set their own terms and availability. We do not control them, cannot guarantee uptime, and are not responsible for the content or accuracy of what they return.
No warranty
The app is provided "as is", without warranty of any kind, to the fullest extent permitted by applicable law. To that same extent, we are not liable for any loss arising from its use. Nothing here limits rights you hold under mandatory consumer law in your country.
Price
The app is free. There is no subscription, no in-app purchase and no advertising. Any future paid feature would be introduced only as an explicit, separate choice.
Contact
Questions about these terms: