# Interject! vs Serotonin Boost

The clearest difference is in-app purchases: Serotonin Boost at none against Interject!'s 2. Serotonin Boost also leads on update cadence (daily vs every 3 months) and ratings volume (19 vs 5). Interject!'s advantage is review sentiment (100% vs 91%). On price, rating, ads and device support there is nothing between them.

Both are free to download. Interject! sells 2 one-off in-app purchases. Serotonin Boost asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Interject! against 4.8 for Serotonin Boost. Both are backed by a comparable volume of ratings — 5 and 19 respectively. Written reviews are what separate them: 100% of Interject!'s written reviews are positive against 91% of Serotonin Boost's.

Interject! ships an update every 3 months, Serotonin Boost daily. The most recent releases landed on September 22, 2026 and June 10, 2026 respectively.

## The numbers

| Metric | Interject! | Serotonin Boost |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (5 ratings)](https://appshunter.io/ios/app/interject/id1238956121/reviews) | **[4.8 (19 ratings)](https://appshunter.io/ios/app/serotonin-boost/id1574734627/reviews)** |
| Number of ratings | 5 | **19** |
| Positive reviews | **100.0% of reviews** | 90.9% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Daily** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 1 MB | 64 MB |
| Requires iOS | 15.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 12+ |
| Developer | [Rory HINNEN](https://appshunter.io/developer/1227247169) | [Ahmed Alkazaz](https://appshunter.io/developer/1574734629) |

## What reviewers say

### Interject!

[App page](https://appshunter.io/ios/app/interject/id1238956121)

Generate unique, sometimes humorous, descriptions to express dislike or confusion. Share these generated phrases via text or social media to express your opinions.

**Highlights:** Generates unique disparaging phrases, Expresses dislike or confusion, Share via text messages, Tweet opinions to social media, Safe-for-work mode available, Can display mature language

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| little TIP | $0.99 | one-time |
| BIG Tip | $4.99 | one-time |


### Serotonin Boost

[App page](https://appshunter.io/ios/app/serotonin-boost/id1574734627)

This app aims to enhance your mood and mental well-being with inspirational quotes and relaxing Lofi music. Discover motivational messages from notable figures and unwind with a curated selection of ambient tunes.

**Highlights:** Motivational quotes, Celebrity and historian quotes, Free Lofi music, Relaxing audio, Positive vibes promotion

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Interject! free?

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

### Is Serotonin Boost free?

Serotonin Boost is free to download, with no in-app purchases.

### Which has better reviews, Interject! or Serotonin Boost?

Serotonin Boost is rated higher. Interject! averages 4.8 out of 5 from 5 ratings, while Serotonin Boost averages 4.8 from 19 ratings.

### Do Interject! or Serotonin Boost have ads?

Neither Interject! nor Serotonin Boost shows ads.

### Which is updated more often, Interject! or Serotonin Boost?

Interject! ships an update every 3 months, and Serotonin Boost daily. Most recently, Interject! was updated on September 22, 2026 and Serotonin Boost on June 10, 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.*