Prefix App vs Xwhy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Prefix App
Easily add prefixes to phone numbers without altering your contacts. Ideal for business users, it offers extensive customization for prefixes and your address book. Includes Siri and Apple Watch support for seamless integration.
- Add prefixes without editing contacts
- Multiple customizable prefixes
- Full and customizable address book
- Recent calls list
- Siri support
- Today widget and Apple Watch app
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Prefix App lets you put a prefix (or suffix) before any phone number without editing your address book. Perfect for business phones and special carrier plans. FEATURES • Full address book • Multiple customizable prefixes • Customizable suffix • Favorites • Recent calls • Direct call from the keypad • Today widget • Apple Watch app • SIRI support • Simple, intuitive and smart interface No more editing contacts or retyping numbers by hand!
Xwhy
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This research platform is focused on delivering a simple, a convenient and an effective way to understand human worlds better. As we respect personal data, the research app is a tool for a participant to indicate a perspective on a particular theme according to individual preferences. This direct-to-participant approach allows to conduct surveys and enables mobile ethnography with ease.
Screenshots
Verdict
The clearest difference is in-app purchases: Xwhy at none against Prefix App's 2. Xwhy also leads on ads (none vs shown) and iOS requirement (13.4 vs 18.0). Prefix App's advantage is update cadence (every 3 weeks vs every 3 months). On price 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. Prefix App sells 2 one-off in-app purchases. Xwhy asks for nothing beyond the download.
Prefix App ships an update every 3 weeks, Xwhy every 3 months. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.
| Parameter | Prefix App | Xwhy |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Positive reviews | 37.3% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 weeks — better | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, Apple Watch | iPhone, iPod |
| Requires iOS | 18.0 | 13.4 — better |
| Further details — not scored | ||
| Size | 13 MB | 16 MB |
| Age rating | 4+ | 4+ |
| Developer | Alain Lima | GRAPE MEDIA |
In-app purchases
Prefix App
- Call from Apple Watch$0.99
- Remove ads$1.99
Xwhy
No in-app purchases
