# Encyclopedia 2 by Informant vs Openings Mastermind

The clearest difference is review sentiment: Encyclopedia 2 by Informant at 100% against Openings Mastermind's 50%. Encyclopedia 2 by Informant also leads on rating (4.9 vs 4.3) and iOS requirement (8.0 vs 18.6). Openings Mastermind's advantage is in-app purchases (none vs 1) and update cadence (fortnightly vs every 4 months). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. Encyclopedia 2 by Informant sells 1 one-off in-app purchase. Openings Mastermind asks for nothing beyond the download.

Encyclopedia 2 by Informant holds the better App Store score, 4.9 against 4.3. Both are backed by a comparable volume of ratings — 15 and 6 respectively. Written reviews point the same way: 100% of Encyclopedia 2 by Informant's written reviews are positive against 50% of Openings Mastermind's.

Encyclopedia 2 by Informant ships an update every 4 months, Openings Mastermind fortnightly. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Encyclopedia 2 by Informant | Openings Mastermind |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (15 ratings)](https://appshunter.io/ios/app/encyclopedia-2-by-informant/id1256485183/reviews)** | [4.3 (6 ratings)](https://appshunter.io/ios/app/openings-mastermind/id6448386251/reviews) |
| Number of ratings | **15** | 6 |
| Positive reviews | **100.0% of reviews** | 50.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 4 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 2 by Informant

[App page](https://appshunter.io/ios/app/encyclopedia-2-by-informant/id1256485183)

This educational tool offers systematic chess training with intermediate-level combinations sorted by theme. It provides interactive lessons, hints, and explanations to help players improve their tactical skills and understanding of the game.

**Highlights:** Systematic chess combinations, Intermediate level training (ELO 2200), Themed sorting of tactics, Interactive theoretical lessons, Hints and mistake refutations, Play against computer, Rating monitoring

**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 2 by Informant free?

Encyclopedia 2 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 2 by Informant or Openings Mastermind?

Encyclopedia 2 by Informant is rated higher. Encyclopedia 2 by Informant averages 4.9 out of 5 from 15 ratings, while Openings Mastermind averages 4.3 from 6 ratings.

### Do Encyclopedia 2 by Informant or Openings Mastermind have ads?

Neither Encyclopedia 2 by Informant nor Openings Mastermind shows ads.

### Which is updated more often, Encyclopedia 2 by Informant or Openings Mastermind?

Encyclopedia 2 by Informant ships an update every 4 months, and Openings Mastermind fortnightly. Most recently, Encyclopedia 2 by Informant was updated on October 21, 2026 and Openings Mastermind on October 24, 2026.

---

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