# Encyclopedia 1 by Informant vs Openings Mastermind

The clearest difference is review sentiment: Encyclopedia 1 by Informant at 100% against Openings Mastermind's 50%. Encyclopedia 1 by Informant also leads on rating (4.9 vs 4.3) and ratings volume (49 vs 6). Openings Mastermind's advantage is in-app purchases (none vs 1) and update cadence (fortnightly vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Encyclopedia 1 by Informant sells 1 one-off in-app purchase. Openings Mastermind asks for nothing beyond the download.

Encyclopedia 1 by Informant holds the better App Store score, 4.9 against 4.3. That said, the two scores are not equally well evidenced: Encyclopedia 1 by Informant has 49 ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 100% of Encyclopedia 1 by Informant's written reviews are positive against 50% of Openings Mastermind's.

Encyclopedia 1 by Informant ships an update every 3 months, Openings Mastermind fortnightly. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Encyclopedia 1 by Informant | Openings Mastermind |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (49 ratings)](https://appshunter.io/ios/app/encyclopedia-1-by-informant/id1256484830/reviews)** | [4.3 (6 ratings)](https://appshunter.io/ios/app/openings-mastermind/id6448386251/reviews) |
| Number of ratings | **49** | 6 |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 44 MB | 88 MB |
| Requires iOS | **8.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chess King](https://appshunter.io/developer/1096660597) | [Christian Heise](https://appshunter.io/developer/1632898424) |

## What reviewers say

### Encyclopedia 1 by Informant

[App page](https://appshunter.io/ios/app/encyclopedia-1-by-informant/id1256484830)

This educational tool offers systematic chess combinations for players around ELO 2000. It provides interactive lessons, hints, and explanations to improve tactical skills and game knowledge. The app includes a free section for testing before unlocking more advanced topics.

**Highlights:** Systematic chess combinations, Interactive lessons and explanations, Hints and mistake refutations, Theoretical sections with interactive play, Progress monitoring (ELO rating), Offline play, Tablet optimized

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Course | $9.99 | one-time |


### Openings Mastermind

[App page](https://appshunter.io/ios/app/openings-mastermind/id6448386251)

Master chess openings with this app. Import studies, explore with advanced engines, and practice specific lines through repetition. Track your progress and improve your game.

**Highlights:** Import Lichess Studies or PGNs, Explore openings with Stockfish 15, Practice openings by repetition, Smart practice queue, Track learning progress

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Encyclopedia 1 by Informant free?

Encyclopedia 1 by Informant is free to download, with in-app purchases available.

### Is Openings Mastermind free?

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

### Which has better reviews, Encyclopedia 1 by Informant or Openings Mastermind?

Encyclopedia 1 by Informant is rated higher. Encyclopedia 1 by Informant averages 4.9 out of 5 from 49 ratings, while Openings Mastermind averages 4.3 from 6 ratings.

### Do Encyclopedia 1 by Informant or Openings Mastermind have ads?

Neither Encyclopedia 1 by Informant nor Openings Mastermind shows ads.

### Which is updated more often, Encyclopedia 1 by Informant or Openings Mastermind?

Encyclopedia 1 by Informant ships an update every 3 months, and Openings Mastermind fortnightly. Most recently, Encyclopedia 1 by Informant was updated on November 2, 2026 and Openings Mastermind on November 3, 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.*