# FlexPro Grip vs MASS Monster

The clearest difference is rating: MASS Monster at 5.0 against FlexPro Grip's 4.1. MASS Monster also leads on review sentiment (100% vs 67%). FlexPro Grip's advantage is in-app purchases (none vs 2) and ratings volume (27 vs 9). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. MASS Monster sells 2 in-app purchases, starting at $19.99 per month. FlexPro Grip asks for nothing beyond the download.

MASS Monster holds the better App Store score, 5.0 against 4.1. Both are backed by a comparable volume of ratings — 27 and 9 respectively. Written reviews point the same way: 67% of FlexPro Grip's written reviews are positive against 100% of MASS Monster's.

FlexPro Grip ships an update every 8 days, MASS Monster weekly. The most recent releases landed on October 30, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | FlexPro Grip | MASS Monster |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.1 (27 ratings)](https://appshunter.io/ios/app/flexpro-grip/id1630738994/reviews) | **[5.0 (9 ratings)](https://appshunter.io/ios/app/mass-monster-workout-planner/id6758273566/reviews)** |
| Number of ratings | **27** | 9 |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Weekly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 93 MB | 209 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [FlexProGrip](https://appshunter.io/developer/1596885871) | [Tylor Vandenbroeke](https://appshunter.io/developer/1871909520) |

## What reviewers say

### FlexPro Grip

[App page](https://appshunter.io/ios/app/flexpro-grip/id1630738994)

This app works with a specialized device to create customized training programs for baseball pitchers. It measures baseline strength and endurance to improve pitching performance, reduce injury risk, and accelerate recovery. Track your progress with saved workout history.

**Highlights:** Customized training protocols, Strength, endurance, and RPD testing, Objective data measurements, Injury risk reduction, Performance enhancement, Workout history tracking

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

**In-app purchases:** none


### MASS Monster

[App page](https://appshunter.io/ios/app/mass-monster-workout-planner/id6758273566)

This app provides structured training guidance and daily accountability to help users build muscle, improve routines, and stay motivated. It fosters community support through challenges and rewards consistency, offering a system for building lasting fitness habits.

**Highlights:** Structured training guidance, Daily accountability, Progress tracking, Community motivation, Rewards and milestones, Clean interface

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| MASS Elite | $19.99 | per month |
| MASS Pro | $49.99 | per month |


## Frequently asked questions

### Is FlexPro Grip free?

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

### Is MASS Monster free?

MASS Monster is free to download, with in-app purchases available.

### Which has better reviews, FlexPro Grip or MASS Monster?

MASS Monster is rated higher. FlexPro Grip averages 4.1 out of 5 from 27 ratings, while MASS Monster averages 5.0 from 9 ratings.

### Do FlexPro Grip or MASS Monster have ads?

Neither FlexPro Grip nor MASS Monster shows ads.

### Which is updated more often, FlexPro Grip or MASS Monster?

FlexPro Grip ships an update every 8 days, and MASS Monster weekly. Most recently, FlexPro Grip was updated on October 30, 2026 and MASS Monster on October 12, 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.*