# SumDU vs lessonX

The clearest difference is update cadence: lessonX at every 3 weeks against SumDU's every 8 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SumDU ships an update every 8 months, lessonX every 3 weeks. The most recent releases landed on June 7, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | SumDU | lessonX |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sumdu/id698235283/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 14 MB | 25 MB |
| Requires iOS | **12.1** | 13.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [App Dev Academy Ltd.](https://appshunter.io/developer/1281918813) | [Serhii Hiba](https://appshunter.io/developer/1743663217) |

## What reviewers say

### SumDU

[App page](https://appshunter.io/ios/app/sumdu/id698235283)

Access your university schedule, including classes, professors, and rooms, all in one convenient app. Download your schedule for offline use and sync it with your device's calendar to avoid missing appointments.

**Highlights:** University schedule access, Professor and auditorium schedules, Offline schedule download, Calendar integration, Schedule for all groups

**In-app purchases:** none


### lessonX

[App page](https://appshunter.io/ios/app/lessonx/id6499497605)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SumDU free?

SumDU is free to download, with no in-app purchases.

### Is lessonX free?

lessonX is free to download, with no in-app purchases.

### Do SumDU or lessonX have ads?

Neither SumDU nor lessonX shows ads.

### Which is updated more often, SumDU or lessonX?

SumDU ships an update every 8 months, and lessonX every 3 weeks. Most recently, SumDU was updated on June 7, 2026 and lessonX on September 23, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*