Metric Converters vs CatKey
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Metric Converters
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This is the Converter Maniacs Mobile Metric Converter. It can convert between twenty different metric prefixes: Yotta, Zetta, Exa, Peta, Tera, Giga, Mega, Kilo, Hecto, Deka, Deci, Centi, Milli, Micro, Nano, Pico, Femto, Atto, Zepto, and Yocto. Not only can it convert between all of those prefixes, but it will also give you the formula and illustrate what you are converting with pictures. The app is fast, intuitive, and easy to use. It is a standalone app, which means that it will work perfectly fine in places with little or no Internet access. We hope this will become one of your favorite utility apps on your phone.
CatKey
This keyboard app provides dedicated Catalan language support, including spell checking and autocorrect, which were removed from iOS. It offers a seamless bilingual experience with Spanish and includes customizable features for a better typing experience.
- Catalan spell checking
- Autocorrect for Catalan
- Word prediction
- Bilingual switching
- Customizable keyboard height
- Offline functionality
- Theme customization
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CatKey is the only iOS keyboard dedicated to Catalan language support. When Apple removed Catalan spell checking in iOS 17.4, millions of Catalan speakers lost a basic tool. CatKey brings it back - and makes it better. BUILT FOR CATALAN SPEAKERS CatKey (teclat catala) was created because no existing keyboard treats Catalan as a first-class language. Gboard and SwiftKey support 75+ languages but none offer dedicated Catalan spell checking. CatKey is Catalan-first, not an afterthought. CORE FEATURES (FREE FOREVER) - Catalan spell checking (corrector ortografic) with a dedicated dictionary - Autocorrect that understands Catalan word structure - Word prediction with smart suggestions - Seamless Catalan-Spanish bilingual switching with automatic language detection - Full QWERTY layout with all Catalan characters via long-press (accents on a, e, i, o, u, cedilla c, interpunct) - Number and symbol keyboards - Haptic feedback with adjustable intensity - Sound feedback on key presses - Adjustable keyboard height: compact, standard, or tall - Space bar shows detected language (Catala, Espanol, English) - Step-by-step onboarding guide for first-time setup CATALAN PRO - ONE-TIME PURCHASE Upgrade once, own it forever. No subscriptions. - Enhanced word prediction with 5 candidates - Advanced autocorrect with deeper error detection - Dialect selection: Balearic and Valencian - Custom dictionary: add your own words - Theme customization with Catalan-inspired designs (Modernisme, Mediterranean, Trencadis) - Professional dictionaries (legal, medical, education) - Priority support PRIVACY FIRST CatKey works entirely offline. No data is collected, transmitted, or stored on any server. Your words stay on your device. Full Access is required only for the keyboard to function - it never sends your typing anywhere. IN-APP PURCHASE CatKey Pro is a one-time purchase of $3.99. No recurring charges. Restore purchases is supported for reinstallations. Download CatKey today and type confidently in Catalan.
Screenshots
Verdict
The clearest difference is price: CatKey at Free against Metric Converters's $0.99. CatKey also leads on update cadence (every 2 months vs every 38 months). Metric Converters's advantage is in-app purchases (none vs 1) and iOS requirement (14.1 vs 17). On ads 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
CatKey is free to download; Metric Converters costs $0.99 up front. CatKey sells 1 one-off in-app purchase. Metric Converters asks for nothing beyond the download.
Metric Converters ships an update every 38 months, CatKey every 2 months. The most recent releases landed on October 23, 2026 and October 21, 2026 respectively.
| Parameter | Metric Converters | CatKey |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | — | 1.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 38 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 14.1 — better | 17 |
| Further details — not scored | ||
| Size | 20 MB | 4 MB |
| Age rating | +4 | 4+ |
| Developer | H Valeur | 贺 周 |
In-app purchases
Metric Converters
No in-app purchases
CatKey
- CatKey Pro$3.99
Questions
Is Metric Converters free?
Is CatKey free?
Do Metric Converters or CatKey have ads?
Which is updated more often, Metric Converters or CatKey?
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