OmniUnits vs UnitDeck
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OmniUnits
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Convert faster. Search less. Get more done. OmniUnits is the unit converter that adapts to your workflow – not the other way around. Instead of endless lists and table-scrolling, you get structured, reusable conversion setups saved as presets and launched directly from your home screen via widgets. WHY OMNIUNITS? Custom Presets: Combine multiple units and categories into a single preset. Perfect for recurring tasks – whether 3D printing, lab measurements, or construction. Build Your Own Formulas: The built-in formula editor handles complex expressions like l*π*pow(d/2;2)*ρ/1000. Define variables, choose units, and calculate instantly – no separate calculator needed. Widget-First Approach: Configure widgets with your presets, favorite categories, or formulas. One tap from the home screen – and you’re right where you need to be. 35+ Unit Categories: From length, mass, and temperature to pressure, torque, and flow rate – all the way to magnetic fields, radioactivity, and currencies. Professional Precision: Control decimal places, scientific notation, and rounding – exactly how you need it. Conversion History: All calculations are saved and easy to look up. Full VoiceOver Support: OmniUnits is completely accessible. WHO IS OMNIUNITS FOR? Engineers & technicians who work with different unit systems daily. Students & scientists who need quick formula evaluation. Construction workers who need on-site conversions. Anyone who needs a reliable, fast conversion tool in everyday life. OmniUnits is free to use (limited amount of conversions per month). Unlock unlimited conversions, more presets, widgets, and formulas with OmniUnits Pro. Download OmniUnits now and experience unit conversion the way it should be: fast, structured, to the point.
UnitDeck
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UnitDeck is a fast unit converter and practical calculation toolbox built for real work. Choose your industry and UnitDeck places the conversions you use most on your Home screen. Convert common and specialist units, search by name or symbol, save favorites, keep conversion records, and add simple work notes without digging through long menus. BUILT AROUND YOUR WORK • Industry profiles for trade, logistics, construction, textiles, manufacturing, furniture, electrical work, HVAC, agriculture, energy, marine work, automotive work, and more • 121 conversion categories covering everyday and professional measurements • 25 practical trade calculators for common field and desk workflows • Search by unit name, symbol, or abbreviation • Favorites, recents, saved conversions, notes, configurable precision, and inch fractions FAST AND PRIVATE • Conversion inputs, saved records, and notes stay on your device • No account required • No advertising or cross-app tracking • Core conversion tools work offline UNITDECK PRO The free version includes a useful set of common conversions, tools recommended for your first industry, and limited previews of professional categories. UnitDeck Pro unlocks the complete professional toolbox with one lifetime purchase. It is not a subscription and does not auto-renew. Conversion results are provided for general information, estimation, and workflow assistance. Verify safety-critical, contractual, engineering, medical, financial, or regulated work against applicable standards and qualified professional guidance.
Screenshots
Verdict
The clearest difference is device support: UnitDeck at 2 against OmniUnits's —. On price, 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
Both are free to download. OmniUnits sells 3 one-off in-app purchases and UnitDeck sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
| Parameter | OmniUnits | UnitDeck |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | — | Every 2 weeks |
| Ads | — | No |
| In-app purchases | Yes | Yes |
| Devices | — | iPhone, iPad — better |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 9 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Florian Lenk | 建辉 刘 |
In-app purchases
OmniUnits
- OmniUnits Plus$1.99
- OmniUnits Pro$2.99
- OmniUnits Pro$3.99
UnitDeck
- UnitDeck Pro – Lifetime$3.99








