# SDTSI vs STSK9

The clearest difference is review sentiment: STSK9 at 100% against SDTSI's 33%. STSK9 also leads on rating (5.0 vs 3.9). SDTSI's advantage is in-app purchases (none vs 1) and ratings volume (47 vs 8). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. STSK9 sells 1 one-off in-app purchase. SDTSI asks for nothing beyond the download.

STSK9 holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: SDTSI has 47 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 33% of SDTSI's written reviews are positive against 100% of STSK9's.

SDTSI ships an update monthly, STSK9 every 2 weeks. The most recent releases landed on October 5, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | SDTSI | STSK9 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (47 ratings)](https://appshunter.io/ios/app/sdtsi/id1562849004/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/stsk9/id6468565276/reviews)** |
| Number of ratings | **47** | 8 |
| Positive reviews | 33.3% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 17 MB | 49 MB |
| Requires iOS | **14.5** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Neptune Media International CO., LIMITED](https://appshunter.io/developer/1498760234) | [STSK9](https://appshunter.io/developer/1710109116) |

## What reviewers say

### SDTSI

[App page](https://appshunter.io/ios/app/sdtsi/id1562849004)

Learn to train your own service dog with comprehensive distance education. This app offers resources and guidance for individuals seeking to certify their canine companions.

**Highlights:** Service dog distance training, Train your own dog, Certification resources, Educational content

**Features:** macOS Compatibility

**In-app purchases:** none


### STSK9

[App page](https://appshunter.io/ios/app/stsk9/id6468565276)

Access specialized online dog training courses and all your training videos in one convenient app. Receive updates and easily find your favorite content.

**Highlights:** Online dog training courses, Access all training videos, Push notifications for updates, Password-free video access, Save favorite posts

**Features:** Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Puppy University Program | $299.00 | one-time |


## Frequently asked questions

### Is SDTSI free?

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

### Is STSK9 free?

STSK9 is free to download, with in-app purchases available.

### Which has better reviews, SDTSI or STSK9?

STSK9 is rated higher. SDTSI averages 3.9 out of 5 from 47 ratings, while STSK9 averages 5.0 from 8 ratings.

### Do SDTSI or STSK9 have ads?

Neither SDTSI nor STSK9 shows ads.

### Which is updated more often, SDTSI or STSK9?

SDTSI ships an update monthly, and STSK9 every 2 weeks. Most recently, SDTSI was updated on October 5, 2026 and STSK9 on September 30, 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.*