# Conversion Calculator vs Happened

The clearest difference is review sentiment: Conversion Calculator at 100% against Happened's 0%. Conversion Calculator also leads on rating (4.8 vs 3.7) and ratings volume (165 vs 3). Happened's advantage is in-app purchases (none vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. Conversion Calculator sells 1 one-off in-app purchase. Happened asks for nothing beyond the download.

Conversion Calculator holds the better App Store score, 4.8 against 3.7. That said, the two scores are not equally well evidenced: Conversion Calculator has 165 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 100% of Conversion Calculator's written reviews are positive against 0% of Happened's.

Conversion Calculator ships an update every 5 weeks, Happened monthly. The most recent releases landed on October 23, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Conversion Calculator | Happened |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (165 ratings)](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/happened-event-logger/id6553981795/reviews) |
| Number of ratings | **165** | 3 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Monthly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 7 MB | 2 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Collins Cheruiyot](https://appshunter.io/developer/1579009978) | [Pavel Shlyapnikov](https://appshunter.io/developer/1676899301) |

## What reviewers say

### Conversion Calculator

[App page](https://appshunter.io/ios/app/conversion-calculator-metric/id6468678523)

Easily convert between metric and imperial units for weight, length, temperature, area, and time. This app offers precise, fast results with a clean interface, working offline for daily, travel, school, or work needs.

**Highlights:** Metric and imperial unit conversion, Weight, length, temperature, area, time, Offline functionality, Precise and fast results, Clean and minimal interface, Over 100 measurement types

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited access forever | $8.99 | one-time |


### Happened

[App page](https://appshunter.io/ios/app/happened-event-logger/id6553981795)

Easily log life events with customizable tags and analyze them using various metrics. Track symptoms, hobbies, or any personal occurrence with a simple tap and visualize your data over time. The app prioritizes your privacy, storing data locally or in your iCloud.

**Highlights:** One-tap event logging, Four tag types: Valueless, Quantified, Balance, Binary, Timeline divided into five parts of the day, Drag and drop tag management, 10 types of visual metrics, Customizable time ranges for analytics, CloudKit data storage for privacy

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Conversion Calculator free?

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

### Is Happened free?

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

### Which has better reviews, Conversion Calculator or Happened?

Conversion Calculator is rated higher. Conversion Calculator averages 4.8 out of 5 from 165 ratings, while Happened averages 3.7 from 3 ratings.

### Do Conversion Calculator or Happened have ads?

Neither Conversion Calculator nor Happened shows ads.

### Which is updated more often, Conversion Calculator or Happened?

Conversion Calculator ships an update every 5 weeks, and Happened monthly. Most recently, Conversion Calculator was updated on October 23, 2026 and Happened on October 22, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*