# Stella vs Piday

The clearest difference is review sentiment: Piday at 100% against Stella's 18%. Piday also leads on rating (5.0 vs 4.5) and in-app purchases (none vs 10). Stella's advantage is ratings volume (3.6K vs 1) and iOS requirement (15.0 vs 17.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Stella sells 10 in-app purchases, starting at $5.99 per 7 days. Piday asks for nothing beyond the download.

Piday holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Stella has 3.6K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 18% of Stella's written reviews are positive against 100% of Piday's.

Stella ships an update every 8 days, Piday every 2 weeks. The most recent releases landed on November 8, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Stella | Piday |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (3.6K ratings)](https://appshunter.io/ios/app/stella-learn-spanish-ai/id6739937896/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/piday/id6760696150/reviews)** |
| Number of ratings | **3.6K** | 1 |
| Positive reviews | 17.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | **Free** |
| Size | 225 MB | 49 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [HONG KONG BETENSH LIMITED](https://appshunter.io/developer/1735878154) | [Erik Veland](https://appshunter.io/developer/1833854400) |

## What reviewers say

### Stella

[App page](https://appshunter.io/ios/app/stella-learn-spanish-ai/id6739937896)

Practice Spanish through AI-powered conversations and interactive lessons. Get instant feedback on pronunciation and grammar to build real-world speaking confidence. Personalized learning paths adapt to your progress, from beginner to advanced.

**Highlights:** AI conversation practice, Pronunciation and speaking training, Grammar and vocabulary lessons, Listening and reading comprehension, Interactive quizzes, Personalized learning paths

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stella AI PRO: Weekly | $5.99 | per 7 days |
| Stella AI PRO: Weekly | $7.99 | per 7 days |
| Stella AI PRO: Weekly Plan | $7.99 | per 7 days |
| Stella AI PRO: Month | $19.99 | per month |
| Free Trial Plan | $29.99 | per year |
| Stella AI PRO: Annual | $29.99 | per year |
| Stella AI PRO: Annual | $39.99 | per year |
| Stella AI PRO: Annual | $49.99 | per year |
| Stella AI PRO: Annual | $49.99 | per year |
| Stella AI PRO: Annual | $59.99 | per year |

**What reviewers like**

- 🤩 Fun and enjoyable app
- 👍 Good for beginners

**What reviewers complain about**

- 🤖 Inaccurate speech recognition
- 🤔 Limited content and lessons
- 🙄 Misleading advertising
- 💰 Overpriced for the features
- 🐛 Frequent app crashes and freezes

**Reported bugs**

- App freezing and crashing during lessons
- Incorrect answers marked as correct
- Inability to progress through lessons

**Requested features**

- More advanced lessons and content
- Improved speech recognition and feedback
- Addition of songs and music-based learning
- Better customer support and responsiveness


### Piday

[App page](https://appshunter.io/ios/app/piday/id6760696150)

This app reveals the precise location of any date within the first five billion digits of pi. Search for significant dates like birthdays or anniversaries and explore their placement in pi's infinite sequence. It supports various date formats and allows you to save and share your discoveries.

**Highlights:** Find today's date in pi, Search for any date in pi, See exact position of dates, Compare multiple date formats, Explore calendar heat map, Save favorite dates, Share discoveries as cards

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Stella free?

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

### Is Piday free?

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

### Which has better reviews, Stella or Piday?

Piday is rated higher. Stella averages 4.5 out of 5 from 3.6K ratings, while Piday averages 5.0 from 1 ratings.

### Do Stella or Piday have ads?

Neither Stella nor Piday shows ads.

### Which is updated more often, Stella or Piday?

Stella ships an update every 8 days, and Piday every 2 weeks. Most recently, Stella was updated on November 8, 2026 and Piday on November 5, 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.*