# PMP formulas vs Six Sigma Society

The clearest difference is rating: Six Sigma Society at 5.0 against PMP formulas's 4.7. PMP formulas's advantage is ratings volume (49 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Six Sigma Society holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: PMP formulas has 49 ratings behind it against 1, so its average is the more settled of the two.

PMP formulas ships an update every 3 weeks, Six Sigma Society every 2 weeks. The most recent releases landed on November 1, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | PMP formulas | Six Sigma Society |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (49 ratings)](https://appshunter.io/ios/app/pmp-formulas/id843708116/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/six-sigma-society/id6569256151/reviews)** |
| Number of ratings | **49** | 1 |
| Positive reviews | 93.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free | Free |
| Size | 54 MB | 49 MB |
| Requires iOS | 17.0 | **16.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Yin Kai Leung Joseph](https://appshunter.io/developer/843708119) | [Six Sigma Society](https://appshunter.io/developer/1763881385) |

## What reviewers say

### PMP formulas

[App page](https://appshunter.io/ios/app/pmp-formulas/id843708116)

Prepare for your PMP exam with this comprehensive study tool. It offers strategic cheat notes, formulas with examples, and memorization aids. Engage with flashcards and quizzes to build confidence and ace the test.

**Highlights:** Strategic cheat notes, PMP formulas and derived formulas, Formulas with examples, Memorization aids for basic formulas, Flashcard challenge, Quiz challenge

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

**In-app purchases:** none

**What reviewers like**

- 👍 Free resource with valuable content
- 📚 Comprehensive formula collection
- 💡 Clear explanations and examples
- 🚀 Useful for on-the-go studying
- 💯 Helps in passing PMP exam

**What reviewers complain about**

- ❓ Some examples could be clearer
- 📉 Limited number of quiz questions
- 🤔 Potential for minor formula errors

**Reported bugs**

- Future Value Calculation is wrong
- Incorrect formula for Future Value (FV)

**Requested features**

- More quizzes focused on calculations
- More quiz questions overall
- Ability to choose quiz topics
- Discount on PMP exam app
- More situational questions in quizzes


### Six Sigma Society

[App page](https://appshunter.io/ios/app/six-sigma-society/id6569256151)

Access all your educational courses in one place, track your learning progress, and prepare for certification exams. Save content for quick retrieval and easily manage your studies.

**Highlights:** Access all courses, Monitor progress, Prepare for exams, Save content, Easy-to-use interface

**In-app purchases:** none


## Frequently asked questions

### Is PMP formulas free?

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

### Is Six Sigma Society free?

Six Sigma Society is free to download, with no in-app purchases.

### Which has better reviews, PMP formulas or Six Sigma Society?

Six Sigma Society is rated higher. PMP formulas averages 4.7 out of 5 from 49 ratings, while Six Sigma Society averages 5.0 from 1 ratings.

### Do PMP formulas or Six Sigma Society have ads?

Neither PMP formulas nor Six Sigma Society shows ads.

### Which is updated more often, PMP formulas or Six Sigma Society?

PMP formulas ships an update every 3 weeks, and Six Sigma Society every 2 weeks. Most recently, PMP formulas was updated on November 1, 2026 and Six Sigma Society on September 17, 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.*