# Piday vs Blackjack Trainer

The clearest difference is in-app purchases: Piday at none against Blackjack Trainer's 4. Piday also leads on device support (4 vs 2). Blackjack Trainer's advantage is ratings volume (5 vs 1). On price, rating, review sentiment and update cadence there is nothing between them.

Both are free to download. Blackjack Trainer sells 4 in-app purchases, starting at $9.99 per year. Piday asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Piday against 5.0 for Blackjack Trainer. That said, the two scores are not equally well evidenced: Blackjack Trainer has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on November 5, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | Piday | Blackjack Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/piday/id6760696150/reviews) | [5.0 (5 ratings)](https://appshunter.io/ios/app/blackjack-trainer-strategy/id6789853035/reviews) |
| Number of ratings | 1 | **5** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 49 MB | 55 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | **iPhone, iPad, Mac, Apple Watch** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Erik Veland](https://appshunter.io/developer/1833854400) | [Appana Ventures LLC](https://appshunter.io/developer/6822964993) |

## What reviewers say

### 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


### Blackjack Trainer

[App page](https://appshunter.io/ios/app/blackjack-trainer-strategy/id6789853035)

Master blackjack strategy with this trainer. Learn optimal plays for any table rules, practice card counting, and improve your decision-making through interactive drills and instant feedback. Track your progress and build consistent habits for better gameplay.

**Highlights:** Adaptive basic strategy charts, Hi-Lo card counting drills, Instant feedback and explanations, Progress tracking and mastery heatmap, Offline practice mode, Daily habit building features

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Yearly | $9.99 | per year |
| Pro Yearly | $19.99 | per year |
| Pro Lifetime | $29.99 | one-time |
| Pro Lifetime | $59.99 | one-time |


## Frequently asked questions

### Is Piday free?

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

### Is Blackjack Trainer free?

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

### Which has better reviews, Piday or Blackjack Trainer?

Piday and Blackjack Trainer are both rated 5.0 out of 5 on the App Store, from 1 and 5 ratings respectively.

### Do Piday or Blackjack Trainer have ads?

Neither Piday nor Blackjack Trainer shows ads.

### Which is updated more often, Piday or Blackjack Trainer?

Piday ships an update every 2 weeks, and Blackjack Trainer every 2 weeks. Most recently, Piday was updated on November 5, 2026 and Blackjack Trainer on November 10, 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.*