Professor Index vs Chrom
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Professor Index
This app allows college students to rate and review professors and courses, providing insights into teaching effectiveness and course relevance. Students can compare professor profiles and make informed enrollment decisions based on peer feedback.
- Rate and review professors
- Get feedback on future professors
- Compare professor profiles
- Make data-informed enrollment decisions
- Gamified review incentives
Read full descriptionHide full description
Professor Index (PI) is a user-friendly mobile app that enables college students to voice their opinions on various aspects of their higher educational experience, ranging from the effectiveness of their professors’ teaching methodologies to the relevance of their course materials. Students can rate and review their professors, request and get feedback about their future professors and courses at a glance, compare different professor profiles, and ultimately, make data-informed class enrollment decisions. To enhance engagement and response rates, PI uses gamification and nudging algorithms to incentivize students to actively review their professors by rewarding meaningful, objective, and fair reviews.
Chrom
A color-guessing game where you swipe and guess to test your knowledge. It offers an interactive and engaging experience, similar to a dating app but focused on colors.
- Color guessing challenges
- Swipe-to-win mechanics
- Interactive learning experience
- Test color knowledge
- Engaging gameplay
Read full descriptionHide full description
What is Chrom? Chrom is the ultimate color-guessing game that lets you swipe, guess, and learn! Challenge your knowledge of colors with an engaging and interactive experience that feels just like your favorite dating app—only for colors!
Screenshots
Verdict
The clearest difference is rating: Chrom at 5.0 against Professor Index's 4.5. Chrom also leads on update cadence (daily vs monthly) and review sentiment (100% vs 88%). Professor Index's advantage is ratings volume (59 vs 3) and device support (3 vs 1). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
Chrom holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Professor Index has 59 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 88% of Professor Index's written reviews are positive against 100% of Chrom's.
Professor Index ships an update monthly, Chrom daily. The most recent releases landed on September 20, 2026 and June 3, 2026 respectively.
| Parameter | Professor Index | Chrom |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (59 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 88.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 59 — better | 3 |
| Update frequency | Monthly | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 13.0 — better | 17.5 |
| Further details — not scored | ||
| Size | 57 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Professor Index, LLC | Syam Shukla |
Customer experience
Professor Index
Chrom
In-app purchases
Professor Index
No in-app purchases
Chrom
No in-app purchases
