# 100 Sit vs Reflex

The clearest difference is ads: Reflex at none against 100 Sit's shown. Reflex also leads on update cadence (every 2 days vs every 2 weeks). 100 Sit's advantage is iOS requirement (16.0 vs 18.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. 100 Sit sells 2 in-app purchases, starting at $3.99 per month and Reflex sells 2 in-app purchases, starting at $6.99 per year. Whichever you choose, the download price is not the number that matters.

100 Sit ships an update every 2 weeks, Reflex every 2 days. The most recent releases landed on October 30, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 100 Sit | Reflex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (139 ratings)](https://appshunter.io/ios/app/100-sit-ups-six-pack-trainer/id6466443313/reviews)** | — |
| Number of ratings | **139** | — |
| Positive reviews | 87.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Size | 370 MB | 2 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Foxyfitness GmbH](https://appshunter.io/developer/1658515547) | [Carsten Schaal](https://appshunter.io/developer/6772482501) |

## What reviewers say

### 100 Sit

[App page](https://appshunter.io/ios/app/100-sit-ups-six-pack-trainer/id6466443313)

This app acts as a personal fitness coach, using your device's motion sensor to automatically count sit-ups. It provides a structured training plan, voice coaching, and motivational features like leaderboards and streaks to help you achieve your core strength and abs goals.

**Highlights:** Automatic sit-up counting via motion sensor, Voice coaching for feedback, Global and friend leaderboards, Personalized training plans, Goal setting and reminders, Workout streaks tracking, Integration with Apple Health

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sit-Ups PRO | $3.99 | per month |
| Sit-Ups PRO | $19.99 | per year |

**What reviewers like**

- 👍 Motivates users to continue
- 👍 Reliable and trustworthy
- 👍 Fun and encouraging
- 👍 Good for home workouts
- 👍 Good motivation

**What reviewers complain about**

- 👎 Inaccurate counting
- 👎 Settings not intuitive
- 👎 Frequent premium upsells
- 👎 Usability issues on smartphones
- 👎 App becomes faulty after in-app purchase

**Reported bugs**

- Counts sit-ups inaccurately
- App freezes after in-app purchase
- Accidentally pay for premium due to screen sensitivity
- Pause ends too soon due to screen sensitivity

**Requested features**

- Allow filters to be set permanently
- Wish for a way to go back
- Language option for Russian
- Option to go back


### Reflex

[App page](https://appshunter.io/ios/app/reflex-reaction-test/id6814605779)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reflex Pro – Yearly | $6.99 | per year |
| Reflex Pro – Lifetime | $17.99 | one-time |


## Frequently asked questions

### Is 100 Sit free?

100 Sit is free to download, with in-app purchases available.

### Is Reflex free?

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

### Do 100 Sit or Reflex have ads?

100 Sit shows ads; Reflex does not.

### Which is updated more often, 100 Sit or Reflex?

100 Sit ships an update every 2 weeks, and Reflex every 2 days. Most recently, 100 Sit was updated on October 30, 2026 and Reflex on October 24, 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.*