Pre vs 100k Mentor Challenge
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pre
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This app calculates the number of achievable gray levels according to the output resolution of a device and the halftone screen ruling used. The user simply enters the output resolution and halftone screen ruling, followed by clicking on a "Calculate" button.
100k Mentor Challenge
Connect with mentors or aspiring leaders to achieve career goals. This app helps diverse college students gain career advice, build networks, and boost confidence. Complete your profile to join the next mentorship match.
- Mentorship matching
- Career advice
- Networking opportunities
- Goal encouragement
- Profile completion
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Inspire the next generation of leaders or get the career advice, network, and encouragement you need to tackle your goals. Replace career anxiety with confidence! Download the app, complete your profile, and join the next mentorship match.
Screenshots
Verdict
The clearest difference is price: 100k Mentor Challenge at Free against Pre's $0.99. 100k Mentor Challenge also leads on update cadence (monthly vs every 38 months). Pre's advantage is ads (none vs shown) and iOS requirement (8.0 vs 15.1). On 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
100k Mentor Challenge is free to download; Pre costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Pre ships an update every 38 months, 100k Mentor Challenge monthly. The most recent releases landed on December 3, 2025 and October 14, 2026 respectively.
| Parameter | Pre | 100k Mentor Challenge |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | — | 4.2 (19 ratings) — better |
| Positive reviews | — | 50.0% of reviews |
| Number of ratings | — | 19 — better |
| Update frequency | Every 38 months | Monthly — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 8.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 1 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Manfred Breede | ProMazo, Inc. |
In-app purchases
Pre
No in-app purchases
100k Mentor Challenge
No in-app purchases
