Metrix vs Whos Free When?
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Metrix
Effortlessly convert between units and currencies as you type. Supports over 80 units across 14 categories, including international sizing and cooking measurements. Offers smart paste, compound formats, and offline currency conversion.
- Converts as you type
- 80+ units and 14 categories
- International sizing conversions
- Offline currency exchange rates
- Smart paste for values and units
- Compound measurement formats
- Customizable categories and units
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You're packing a suitcase and need to know if 23 kg is over the limit. You're halving a recipe and 350 g of flour means nothing in cups. You're pricing something abroad and want it in dollars without three taps. Metrix converts as you type. No buttons. No waiting. Every row updates with every digit. 14 categories. 80+ units. 80+ currencies refreshed daily. International sizes, instantly convert shoe, clothing, ring and bra sizes between US, EU, UK and Japan. No more guessing your size when shopping abroad. Common conversions, instantly: kg to lbs, cm to inches, celsius to fahrenheit, kilometers to miles, meters to feet, grams to ounces, grams to cups, liters to ml, mm to inches, EUR to USD, GBP to USD. Type the number, every related unit updates the moment you do. Free, always • Length: cm, inches, feet, meters, miles, yards, nautical miles • Weight: kg, grams, pounds, ounces, stone, milligrams • Temperature: Fahrenheit, Celsius, Kelvin • Time: seconds, minutes, hours, days, weeks, months, years • Currency: 80+ currencies, refreshed daily, works offline • Sizes: shoe, clothing, ring and bra (US, EU, UK, Japan) • Volume: liters, milliliters, gallons, pints, quarts • Cooking: cups, tbsp, tsp. Real fractions: see 1 ¾ cups, not 1.7500 • Area: square feet, square meters, acres, hectares • Speed: mph, km/h, knots, m/s • Torque: newton-meters, foot-pounds, inch-pounds, kgf·m • Energy: joules, kJ, calories, kWh, BTU • Pressure: Pascal, kPa, bar, PSI, atm, mmHg • Digital Storage: bytes, KB, MB, GB, TB • Favorites: pin the conversions you use every day • History: every result saved, tap any row to restore What makes it different Type a calculation in any cell. 4.5 × 3.2 right where you'd type the number, see the answer in square feet instantly. No separate calculator app. Smart paste. Copy "5 feet" or "72.5 kg" from anywhere. Tap Paste. Metrix sets the unit AND the value in one move. Compound formats. See height as "5 ft 10 in" or weight as "7 lb 3 oz" alongside the decimal. The way people actually read measurements. Currency that knows where you are. Open Currency anywhere in the world and your home currency is at the top. House icon marks it. Tap any other to set a new home. Customize everything. Reorder categories. Hide ones you'll never use. Reorder units inside any category. Make Metrix yours in 30 seconds. Locale-aware. Type 2,5 in Germany or 2.5 in the US, Metrix understands both. Numbers render in your local format (1.234,56 vs 1,234.56). iPhone and iPad. Native iPad layout with sidebar + always-on calculator-style numpad. iPhone uses the system keyboard with paste + operators above it. One purchase. No subscription. No ads. No tracking. No accounts. Works fully offline (currency uses cached rates when disconnected). Who it's for • Travelers checking luggage, prices, and clothing sizes abroad • Cooks scaling recipes between metric and imperial • Engineers, students, and runners who switch systems all day • Anyone tired of asking Google "how many feet in a meter" for the hundredth time
Whos Free When?
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Planning anything with a group shouldn't feel like a second job. WhosFreeWhen? is the simplest way to find a date that works for everyone. Create an event, share the link, and let everyone tap the days they're free. You'll instantly see which dates have the most availability, no back-and-forth, no spreadsheets, no chasing people down. How it works Create an event in seconds and share the link with anyone, they don't even need an account. Each person taps their available and unavailable days on the calendar. Long-press any day to see exactly who's free and who isn't. When you've got your date, use built-in polls to sort out the details: where to eat, what to watch, who's bringing what. Perfect for - Scheduling nights out, trips, or dinners with friends - Coordinating team meetups or work events - Planning family gatherings across busy calendars - Any group decision where timing is everything Key features - Shared availability calendar — see the whole group at a glance - Long-press any day to see who's available and who isn't - Group polls, settle decisions alongside your scheduling - Share via link or event ID, no app required to participate - Works as a guest or with a free account - Free account syncs your events across all your devices
Screenshots
Verdict
The clearest difference is update cadence: Metrix at every 3 days against Whos Free When?'s every 8 days. Whos Free When?'s advantage is iOS requirement (15.1 vs 17.0). On price, ads, 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. Metrix sells 1 one-off in-app purchase and Whos Free When? sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Metrix ships an update every 3 days, Whos Free When? every 8 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.
| Parameter | Metrix | Whos Free When? |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 3 days — better | Every 8 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 15.1 — better |
| Further details — not scored | ||
| Size | 20 MB | 23 MB |
| Age rating | 4+ | 4+ |
| Developer | Reply200 Inc. | Joe Cobain |
In-app purchases
Metrix
- Metrix Pro$5.99
Whos Free When?
- WhosFreeWhen Pro Lifetime$2.99









