Unit Converter vs Spirio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Unit Converter
This app offers a comprehensive unit conversion tool with over 300 units across 27 categories. It supports compound units, date calculations, and conversions between various number systems, including historical units. The interface is designed for ease of use with smart keyboards and customizable display options.
- 27 conversion categories
- 300+ units
- Compound unit support
- Date calculator
- Fractions and number conversions
- Historical units
- Customizable interface
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Convert everything - 31 categories, 300+ units! Mila's Tools Unit Converter puts 31 converters in your pocket at no cost. Whether you need to convert temperatures for a recipe, check tire pressure in PSI, find your ring size across international standards, or calculate the days until a deadline, this app handles it all with precision and ease. What customers are saying: ***** "Get it! Nothing better than this!" ***** "This is the best quick ref tool I have come across to date" ***** "Undoubtedly the best conversion app in the App Store." ***** "Best app for me so far." ***** "Intuitive interface. The app design is so easy you'll actually use it." 31 CONVERSION CATEGORIES Angle · Area · Bits & Bytes · Blood Sugar · Capacitance · Cooking · Current · Data Transfer Rates · Dates · Density · Energy · Flow Rate · Force · Fractions · Frequency · Fuel Economy · Gauges · Illuminance · Length · Numbers · Power · Pressure · Ring Sizes · Shoes · Slope · Speed · Temperature · Time · Torque · Volume · Weight COMPOUND UNITS Work with real-world measurements like feet + inches, pounds + ounces, or gallons + quarts. Values auto-normalize — type 13 inches and see 1 foot 1 inch instantly. DATE CALCULATOR Find the exact number of days, weeks, months, and years between any two dates. Add or subtract time from a date with quick-action shortcuts like "90 Days from Today" or "End of Year." DATE CONVERTER See any date across 10 calendar systems — Gregorian, Islamic, Hebrew, Chinese, Persian, Indian National, Coptic, Ethiopic, Buddhist, and Japanese — plus Unix timestamps, Julian Day numbers, and ISO 8601 week dates. Tap the info icon for details on each calendar system. FRACTIONS & NUMBERS Convert between fractions, decimals, and percentages. Translate numbers into Roman numerals, binary, octal, and hexadecimal. Explore magnitudes from thousands to decillions. RING SIZES Convert between US, EU, Swiss, Japanese, Chinese (Mainland), and Hong Kong ring sizing standards. View inner diameter and circumference in millimeters for precise measurements. HISTORICAL UNITS Go beyond modern measurements with ancient Egyptian, Mesopotamian, Greek, Roman, and Biblical units of length. BUILT FOR PRECISION Choose automatic smart formatting or set manual decimal precision from 0 to 10 places. Locale-aware number formatting respects your region's separators and conventions. SMART CUSTOM KEYBOARDS Purpose-built keyboards for every input type — numeric, whole number, Roman numeral, binary, octal, and hexadecimal — so you never have to fight autocorrect. DESIGNED FOR YOU • Dark mode with rich, category-specific color themes • Comfortable or compact view styles • Show or hide any unit in any category • Available on iPhone, iPad, and Mac Download now and experience the most comprehensive unit conversion app available! - - - - - Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Spirio
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Spirio is the fastest way to start a guided breathing session — no account, no onboarding, works offline. Open the app, pick a pattern, tap Start. That's it. Three scientifically-grounded breathing patterns are built in: • Box Breathing (4-4-4-4) — used by Navy SEALs and athletes to build focus under pressure • 4-7-8 — the extended exhale that switches on your body's rest response in minutes • Physiological Sigh — a double-inhale that offloads CO₂ fast, the quickest stress reset known A smooth animated orb expands on inhale and contracts on exhale so you never have to look at numbers — just follow the circle. Haptic feedback marks every phase transition so you can breathe with your eyes closed. Spirio Pro unlocks: • Custom Patterns — set any inhale / hold / exhale / rest timing you want • Session History — see every session completed, total minutes breathed • Extended Sessions — up to 30 minutes for a full practice No subscription. One purchase, yours forever.
Screenshots
Verdict
The clearest difference is ads: Spirio at none against Unit Converter's shown. Unit Converter's advantage is iOS requirement (17.6 vs 26.0). On price, in-app purchases and device support 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. Unit Converter sells 3 in-app purchases, starting at $0.99 per month and Spirio sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
| Parameter | Unit Converter | Spirio |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (1.5K ratings) — better | — |
| Positive reviews | 87.7% of reviews | — |
| Number of ratings | 1.5K — better | — |
| Update frequency | Weekly | — |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.6 — better | 26.0 |
| Further details — not scored | ||
| Size | 13 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Scott DeSapio | 永 张 |
Bugs and requests
Unit Converter
Reported bugs
2 issues- Crashes or freezes on some devices
- Conversion results not displaying properly
Requested features
3 requests- Ability to customize order of conversion units
- Addition of more specialized units (e.g. astronomical distances)
- Improved scrolling functionality on all devices
Spirio
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Unit Converter
- Mila's Tools PRO Monthly$0.991 Month
- Mila's Tools PRO Yearly$4.991 Year
- Mila's Tools PRO Lifetime$9.99
Spirio
- Spirio Pro$4.99
Questions
Is Unit Converter free?
Is Spirio free?
Do Unit Converter or Spirio have ads?
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