# ESP Trainer vs Blackjack 21

The clearest difference is price: Blackjack 21 at Free against ESP Trainer's $0.99. Blackjack 21 also leads on update cadence (fortnightly vs every 14 months) and ratings volume (5.7K vs 293). ESP Trainer's advantage is in-app purchases (none vs 13) and review sentiment (75% vs 55%). On ads and device support there is nothing between them.

Blackjack 21 is free to download; ESP Trainer costs $0.99 up front. Blackjack 21 sells 12 in-app purchases, starting at $4.99 per month. ESP Trainer asks for nothing beyond the download.

Blackjack 21 holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Blackjack 21 has 5.7K ratings behind it against 293, so its average is the more settled of the two. Written reviews complicate that: 75% of ESP Trainer's written reviews are positive against 55% of Blackjack 21's, so the app with the better star average is not the one people write more warmly about.

ESP Trainer ships an update every 14 months, Blackjack 21 fortnightly. Both last shipped on November 1, 2026.

## The numbers

| Metric | ESP Trainer | Blackjack 21 |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [4.5 (293 ratings)](https://appshunter.io/ios/app/esp-trainer/id336882103/reviews) | **[4.7 (5.7K ratings)](https://appshunter.io/ios/app/blackjack-21-strategy-trainer/id597239290/reviews)** |
| Number of ratings | 293 | **5.7K** |
| Positive reviews | **75.2% of reviews** | 54.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Best chart rank | **#5** | #158 |
| Size | 16 MB | 69 MB |
| Requires iOS | **7.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Russell Targ](https://appshunter.io/developer/336882106) | [BlackJack Trainer 21 Training AG](https://appshunter.io/developer/1824121005) |

## What reviewers say

### ESP Trainer

[App page](https://appshunter.io/ios/app/esp-trainer/id336882103)

**Currently charting:** #5 Top Paid · Casino (US App Store)

Enhance your psychic abilities with this ESP trainer. Developed under a NASA program, it helps you improve clairvoyant skills through interactive color-square guessing games. Experience multi-sensory feedback and learn to recognize intuitive impressions.

**Highlights:** Color-square guessing game, Multi-sensory feedback (chime, vibration, visual), Score tracking and encouragement, Optional 'Pass' button for non-forced choices, Reinforcement for skill learning, Develop intuitive awareness

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

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and effective
- 🤩 Helps develop intuition
- 🧠 Trains psychic abilities
- 🎯 Accurate feedback on performance
- 🌟 Impressive high scores possible

**What reviewers complain about**

- 🔇 Loud, annoying sound effects
- 🔍 Lack of performance tracking/history
- 🐛 Occasional bugs and glitches
- 🤔 Questionable scientific validity

**Reported bugs**

- Freezing or crashing on some devices
- Inconsistent responsiveness of color squares
- Inability to disable sound effects

**Requested features**

- Volume/sound control options
- Performance tracking and statistics
- More difficulty levels or game modes
- Integration with other mindfulness apps


### Blackjack 21

[App page](https://appshunter.io/ios/app/blackjack-21-strategy-trainer/id597239290)

**Currently charting:** #158 Top Free · Casino, #180 Top Grossing · Casino (US App Store)

Master blackjack with this strategy trainer. Learn optimal decisions for hitting, standing, splitting, doubling, and surrendering through realistic hands and instant feedback. Improve your confidence and decision-making at the table without any real money or distractions.

**Highlights:** Practice real blackjack decisions, Get instant feedback on moves, View adaptive basic strategy table, Learn professional playing techniques, No money or card counting involved

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| All PRO features - monthly | $4.99 | per month |
| Flash Sale! PRO - monthly | $7.99 | per month |
| All PRO features - monthly | $7.99 | per month |
| All PRO features - monthly | $8.99 | per month |
| All PRO features - yearly | $23.90 | per year |
| All PRO features - yearly | $23.99 | per year |
| All PRO features - annually | $23.99 | per year |
| Flash Sale! PRO - yearly | $24.99 | per year |
| Pair Practice Mode | $1.99 | one-time |
| Soft Hand Training Mode | $1.99 | one-time |
| Custom Table Settings | $1.99 | one-time |
| All PRO features - lifetime | $49.99 | one-time |

**What reviewers like**

- 🚀 Great training
- 👍 Helpful for practicing basic strategy
- 👍 Solid interface
- 👍 Detailed feedback
- 👍 Easy to use UI

**What reviewers complain about**

- 🐛 Buggy with pop-ups and crashes
- 🔒 Subscription model for full functionality
- 🔒 Paywall for advanced features
- 👎 Lacks explanation for correct/incorrect moves
- 👎 Inaccurate basic strategy recommendations

**Reported bugs**

- Incorrect basic strategy recommendations
- Freezing and crashing issues
- Incompatibility with certain devices
- Subscription issues and unexpected charges

**Requested features**

- Allow continuing hands beyond initial deal
- Provide explanations for correct/incorrect moves
- Incorporate card counting and strategy deviations
- Customize settings to match casino rules
- Reset weakest hands chart


## Frequently asked questions

### Is ESP Trainer free?

ESP Trainer costs $0.99, with no in-app purchases.

### Is Blackjack 21 free?

Blackjack 21 is free to download, with in-app purchases available.

### Which has better reviews, ESP Trainer or Blackjack 21?

Blackjack 21 is rated higher. ESP Trainer averages 4.5 out of 5 from 293 ratings, while Blackjack 21 averages 4.7 from 5.7K ratings.

### Do ESP Trainer or Blackjack 21 have ads?

Neither ESP Trainer nor Blackjack 21 shows ads.

### Which is updated more often, ESP Trainer or Blackjack 21?

ESP Trainer ships an update every 14 months, and Blackjack 21 fortnightly. Most recently, ESP Trainer was updated on November 1, 2026 and Blackjack 21 on November 1, 2026.

### Which is more popular, ESP Trainer or Blackjack 21?

ESP Trainer currently peaks at #5 in the App Store charts, and Blackjack 21 at #158. Chart position reflects recent download velocity rather than total install base.

---

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