Piazza vs Idemat
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Piazza
This platform facilitates communication and learning for higher education. Students can ask and answer questions, while instructors can monitor student engagement. It provides real-time updates and a centralized space for class interactions.
- Ask and answer questions
- Real-time updates
- Centralized class communication
- Student engagement monitoring
- Mobile access for students and instructors
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Piazza is the leading social learning platform for higher education, used by hundreds of thousands of students and more than 15 thousand professors for centralized class communications and polling. If you're a student, the Piazza app lets you ask and answer questions in all your Piazza classes from your mobile device, and updates you in real time when your peers are engaged. If you're an instructor, the app gives you a simple way to check in on your students during those spare moments between meetings. Stay connected to your class with Piazza!
Idemat
This app helps designers assess the environmental impact of their material choices and processes. It provides extensive data on materials and processes to support sustainable product design, making life cycle assessment more accessible.
- Material and process environmental impact data
- Eco-costs and carbon footprint assessment
- Sustainable product design support
- Life cycle assessment integration
- Predefined end-of-life scenarios
- Visual rankings and detail screens
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Idemat is an essential and must-have tool for designers caring about the impact of their designs regarding material choice and related processes. Sustainable design plays an increasingly important role in society and product design. However, designers often struggle with choosing the right materials, think the process is too time consuming or lack the necessary support and inspiration to perform the task ahead. To address these challenges, Delft University of Technology initiated a MSc graduation project, which involved design firms, design professionals and design students - seeking an answer to the question: "How can we empower designers to create more sustainable products?" The Idemat app provides the answer. By bridging the gap between existing environmental knowledge and design practice, it brings life cycle assessment closer to the start of the design process – an area where more significant environmental gains can be realized. Integrating and building on the foundations of the existing IDEMATapp database by Delft University of Technology (available at www.ecocostsvalue.com), this app features an extensive collection of environmental impact data regarding materials and processes, which allows for the assessment of the eco-burden of products based on two distinct single indicators: eco-costs and carbon footprint. A clear navigational structure functions as a guiding hand. Predefined end-of-life scenarios are automatically applied to subsequent steps, greatly simplifying the selection process. The over 480 materials and processes are divided in distinct categories, allowing for fast look-up and comparison. Visual rankings and detail screens help the user to understand and act on the presented data, and share options allow for interesting finds to be shared to others. The means is in your hands, now it's up to you to act on it!
Screenshots
Verdict
The clearest difference is rating: Idemat at 5.0 against Piazza's 2.1. Piazza's advantage is update cadence (every 11 days vs every 8 months) and ratings volume (279 vs 3). 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.
Idemat holds the better App Store score, 5.0 against 2.1. That said, the two scores are not equally well evidenced: Piazza has 279 ratings behind it against 3, so its average is the more settled of the two.
Piazza ships an update every 11 days, Idemat every 8 months. The most recent releases landed on October 14, 2026 and October 1, 2026 respectively.
| Parameter | Piazza | Idemat |
|---|---|---|
| Price | Free | Free |
| Rating | 2.1 (279 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 14.2% of reviews | — |
| Number of ratings | 279 — better | 3 |
| Update frequency | Every 11 days — better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Piazza Technologies, Inc. | joost vogtlander |
Customer experience
Piazza
Idemat
Bugs and requests
Piazza
Reported bugs
4 issues- Inability to post or reply
- Randomly logs out users
- Fails to load posts and resources
- Incompatible with newer iOS versions
Requested features
5 requests- Dark mode option
- Ability to access course materials
- Improved formatting and editing tools
- Better organization of posts and discussions
- Seamless integration with web version
Idemat
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Piazza
No in-app purchases
Idemat
No in-app purchases









