Prep AI vs Callday
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Prep AI
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Get ready for your next big opportunity with expert-level mock interview sessions with real-time voice AI. Improve your communication skills, practice your delivery, and build confidence to succeed in your next interview. Pay for Pro access with a 3 day free trial and get: - RealTime interviewing - Adaptive questions - Role-Specific interviews - Behavioral & technical questions - Realtime AI feedback - Speech analysis - Industry-based interviews - Job level adjustment - Interviewer personality - Voice and tone customization - Real-time emotion recognition Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Callday
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You know you should be calling. Instead there's always something else. Another course, another ad channel, another tool that promises clients without ever picking up the phone. And deep down you know: cold calling is still the most direct way to book meetings and close deals. The only thing between you and a full calendar is the next call you keep putting off. Callday is built for exactly that. It turns cold calling from the task you avoid into the habit that fills your calendar. One lead at a time, one decision per lead. You call. Callday handles the rest. YOUR FIRST LIST IS FREE Pick an industry and a city. Callday scans Google Maps and builds a call-ready list in minutes, with phone numbers, websites and ratings. Already have leads? Import any CSV or Excel file. HOW A CALLDAY WORKS 1. Build a new call list in minutes. 1. Open the list. Swipe right to call a lead, swipe left to let it go. 2. Log the outcome: meeting, call later, no answer, not interested. 3. Book a meeting and it lands in your calendar with a Zoom link. The confirmation email goes out from your own connected inbox, and the reminder is scheduled. No spreadsheet to keep up to date, no CRM to feed. Just the next call. Make today a Callday. Terms: https://callday.io/terms Privacy: https://callday.io/privacy
Screenshots
Verdict
The clearest difference is iOS requirement: Callday at 15.1 against Prep AI's 18.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Prep AI sells 1 in-app purchase, starting at $9.99 per 7 days and Callday sells 2 in-app purchases, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.
Prep AI ships an update weekly, Callday every 8 days. The most recent releases landed on October 4, 2026 and October 11, 2026 respectively.
| Parameter | Prep AI | Callday |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly โ better | Every 8 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPod โ better |
| Requires iOS | 18.0 | 15.1 โ better |
| Further details โ not scored | ||
| Size | 12 MB | 49 MB |
| Age rating | 4+ | 4+ |
| Developer | HamiltonZell, LLC | Jan-Erik Bettermann |
In-app purchases
Prep AI
- Pro Access3 Days trial$9.997 Days
Callday
- Callday Pro14 Days trial$14.991 Month
- Callday Pro14 Days trial$119.001 Year









