# SiiAPP vs ValidApp CRT

The clearest difference is update cadence: SiiAPP at fortnightly against ValidApp CRT's every 39 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.

SiiAPP ships an update fortnightly, ValidApp CRT every 39 months. The most recent releases landed on September 16, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | SiiAPP | ValidApp CRT |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (5 ratings)](https://appshunter.io/ios/app/siiapp/id1488201798/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 12.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 39 months |
| Monetization | Free | — |
| Size | 61 MB | 17 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Oscar Mendez Hernandez](https://appshunter.io/developer/1488201797) | [Consejo Regulador del Tequila A. C.](https://appshunter.io/developer/1566031771) |

## What reviewers say

### SiiAPP

[App page](https://appshunter.io/ios/app/siiapp/id1488201798)

Easily access class schedules, teacher details, and professor reviews. View past academic cycles and customize your timetable. Offline access available for loaded information.

**Highlights:** Classroom and teacher lookup, Professor reviews and ratings, Customizable timetable design, Past academic cycle schedules, Offline access to data

**Features:** macOS Compatibility

**In-app purchases:** none


### ValidApp CRT

[App page](https://appshunter.io/ios/app/validapp-crt/id6449137052)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SiiAPP free?

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

### Is ValidApp CRT free?

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

### Do SiiAPP or ValidApp CRT have ads?

Neither SiiAPP nor ValidApp CRT shows ads.

### Which is updated more often, SiiAPP or ValidApp CRT?

SiiAPP ships an update fortnightly, and ValidApp CRT every 39 months. Most recently, SiiAPP was updated on September 16, 2026 and ValidApp CRT on September 15, 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.*