Sona Mobile vs Grades
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sona Mobile
This mobile application grants users access to the Sona Systems platform. It is designed for participants, researchers, and principal investigators, requiring the specific URL of a Sona site for functionality.
- Access Sona Systems
- For participants
- For researchers
- For principal investigators
- Requires Sona site URL
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This app provides access to Sona Systems for users of the system. It works for participant users, researchers and principal investigators. You will need to know the URL of your Sona site in order to use this app.
Grades
Calculate the exact scores needed on future assignments to achieve desired grades and overall GPA. Customize your experience with icons and colors, and manage assignments with flexible grading options.
- Grade Calculator
- GPA Calculator
- Custom icons and colors
- Grouped assignments
- Weighted or Points grading
- Supports all GPA scales
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Grades shows what you need on your next test to hit your target grades and GPA. Features: - Grade Calculator - GPA Calculator - Custom icons and colors - Grouped assignments and extra credit - Weighted or Points grading - Supports all GPA scales - Light and dark modes - Super fast customer support Hope you find my app helpful! - Seth Radman, Georgia Tech ---------- Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.iubenda.com/privacy-policy/50447321
Screenshots
Verdict
The clearest difference is review sentiment: Grades at 70% against Sona Mobile's 20%. Grades also leads on rating (4.9 vs 2.7) and ratings volume (13K vs 10). Sona Mobile's advantage is in-app purchases (none vs 7) and iOS requirement (15.1 vs 18.0). On price, ads 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. Grades sells 7 in-app purchases, starting at $3.99 per month. Sona Mobile asks for nothing beyond the download.
Grades holds the better App Store score, 4.9 against 2.7. That said, the two scores are not equally well evidenced: Grades has 13K ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 20% of Sona Mobile's written reviews are positive against 70% of Grades's.
Sona Mobile ships an update every 3 months, Grades every 2 weeks. The most recent releases landed on July 25, 2026 and September 26, 2026 respectively.
| Parameter | Sona Mobile | Grades |
|---|---|---|
| Price | Free | Free |
| Rating | 2.7 (10 ratings) | 4.9 (13K ratings) — better |
| Positive reviews | 20.0% of reviews | 70.0% of reviews — better |
| Number of ratings | 10 | 13K — better |
| Update frequency | Every 3 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 18.0 |
| Further details — not scored | ||
| Size | 38 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | Sona Systems | Plutonium Apps, LLC |
Customer experience
Sona Mobile
Grades
Bugs and requests
Sona Mobile
Not enough reviews yet to summarise bugs or requests.
Grades
Reported bugs
3 issues- Courses and assignments disappearing after using the app
- Incorrect grade calculations when using grouped assignments
- Crashes after recent app updates
Requested features
5 requests- Add more than 4 classes in free version
- Ability to customize grade scales (e.g. GCSE, WAM)
- Option to add bonus points or extra credit
- GPA calculator that accounts for credit hours
- Calendar integration for assignment tracking
In-app purchases
Sona Mobile
No in-app purchases
Grades
- Grades Premium$3.991 Month
- Grades Premium$5.991 Month
- Grades Premium$7.991 Month
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- Grades Premium$9.991 Year
- Grades Premium$14.991 Year
- Grades Premium$19.991 Year
- Grades Premium$8.99
Questions
Is Sona Mobile free?
Is Grades free?
Which has better reviews, Sona Mobile or Grades?
Do Sona Mobile or Grades have ads?
Which is updated more often, Sona Mobile or Grades?
Other comparisons
