Interject! vs Serotonin Boost
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interject!
Generate unique, sometimes humorous, descriptions to express dislike or confusion. Share these generated phrases via text or social media to express your opinions.
- 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
Read full descriptionHide full description
Ever wish you had a slightly more elegant means of expressing your dislike for someone? Would you like to confuse your enemies and bamboozle onlookers? With a simple swipe, Interject! creates a unique description of the object of your ire! Send it in texts, or tweet your opinion to the world! (Please note: While this app starts in a safe-for-work mode, it will display bad words if properly encouraged. Probably not recommended for young children or politicians.)
Serotonin Boost
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.
- Motivational quotes
- Celebrity and historian quotes
- Free Lofi music
- Relaxing audio
- Positive vibes promotion
Read full descriptionHide full description
Serotonin Boost is an App that has several purposes. Serotonin Boost promotes overall good positive vibes and mental health. It has the capability to inspire you when you're feeling unmotivated with motivational quotes from your favorite celebrities to historians. It also can be used to listen to free Lofi music if you want to feel empowered to feeling relaxed. Most Sounds are credited to ZapSlat and images are credited to Unsplash. Street Fighter remix credited to Antoine Lavenant.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Interject! | Serotonin Boost |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (5 ratings) | 4.8 (19 ratings) — better |
| Positive reviews | 100.0% of reviews — better | 90.9% of reviews |
| Number of ratings | 5 | 19 — better |
| Update frequency | Every 3 months | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 64 MB |
| Age rating | 12+ | 12+ |
| Developer | Rory HINNEN | Ahmed Alkazaz |
Customer experience
Interject!
Serotonin Boost
In-app purchases
Interject!
- little TIP$0.99
- BIG Tip$4.99
Serotonin Boost
No in-app purchases
Questions
Is Interject! free?
Is Serotonin Boost free?
Which has better reviews, Interject! or Serotonin Boost?
Do Interject! or Serotonin Boost have ads?
Which is updated more often, Interject! or Serotonin Boost?
Other comparisons
