# Danger Notes vs RayCrest Lab Calculator

The clearest difference is in-app purchases: RayCrest Lab Calculator at none against Danger Notes's 5. RayCrest Lab Calculator also leads on ads (none vs shown). Danger Notes's advantage is update cadence (every 10 days vs every 2 months) and ratings volume (2.3K vs 3). On price, rating, device support and iOS requirement there is nothing between them.

Both are free to download. Danger Notes sells 5 one-off in-app purchases. RayCrest Lab Calculator asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Danger Notes against 4.7 for RayCrest Lab Calculator. That said, the two scores are not equally well evidenced: Danger Notes has 2.3K ratings behind it against 3, so its average is the more settled of the two.

Danger Notes ships an update every 10 days, RayCrest Lab Calculator every 2 months. The most recent releases landed on October 17, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Danger Notes | RayCrest Lab Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (2.3K ratings)](https://appshunter.io/ios/app/danger-notes-write-or-die/id1435405127/reviews)** | [4.7 (3 ratings)](https://appshunter.io/ios/app/raycrest-lab-calculator/id6785651551/reviews) |
| Number of ratings | **2.3K** | 3 |
| Positive reviews | 83.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 10 days** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 13 MB | 7 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Villegas Ventures LLC](https://appshunter.io/developer/1082275065) | [RAYCREST SOFTWARE LLC](https://appshunter.io/developer/1847966144) |

## What reviewers say

### Danger Notes

[App page](https://appshunter.io/ios/app/danger-notes-write-or-die/id1435405127)

This app is designed to combat writer's block by requiring continuous typing to save your work. If you stop typing, all unsaved progress is permanently deleted, encouraging a consistent writing flow.

**Highlights:** Continuous typing required to save, Work deleted if typing stops, Fights writer's block, Encourages writing flow, Suitable for essays, books, and lyrics

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support Danger Notes via a Tip | $0.99 | one-time |
| Support Danger Notes via a Tip | $1.99 | one-time |
| Support Danger Notes via a Tip | $2.99 | one-time |
| Support Danger Notes via a Tip | $3.99 | one-time |
| Buy Me Coffee | $4.99 | one-time |

**What reviewers like**

- 🚀 Motivates writing
- 👍 Helps with writer's block
- 🚀 Boosts creativity
- 👍 Simple and easy to use
- 🚀 Encourages writing without overthinking

**What reviewers complain about**

- 🐛 Accidental deletion of work
- 🔍 Inability to pause or resume writing sessions
- 💡 Lack of formatting options (bold, italics, etc.)
- 🐛 Overlapping text when reaching page limit
- 💡 Inability to set word count goal instead of time

**Reported bugs**

- Accidental deletion of work
- Overlapping text when reaching page limit
- Glitches after updating to iOS 16

**Requested features**

- Add writing prompts
- Implement a pause/resume function
- Provide formatting options
- Allow setting word count goals
- Add a way to export or share written work


### RayCrest Lab Calculator

[App page](https://appshunter.io/ios/app/raycrest-lab-calculator/id6785651551)

This app assists researchers, students, and lab teams with essential calculations for preparing buffers, solutions, and dilutions. It provides practical guidance for weighing solids, mixing stocks, and titration, with built-in tools for buffer charts, recipes, and protocol timers.

**Highlights:** Buffer preparation guidance, Henderson-Hasselbalch recipes, Stock mixing and titration, Solution and dilution calculations, Mass/volume conversions, Protocol timers, Saved recipes and compounds

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

**In-app purchases:** none


## Frequently asked questions

### Is Danger Notes free?

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

### Is RayCrest Lab Calculator free?

RayCrest Lab Calculator is free to download, with no in-app purchases.

### Which has better reviews, Danger Notes or RayCrest Lab Calculator?

Danger Notes is rated higher. Danger Notes averages 4.8 out of 5 from 2.3K ratings, while RayCrest Lab Calculator averages 4.7 from 3 ratings.

### Do Danger Notes or RayCrest Lab Calculator have ads?

Danger Notes shows ads; RayCrest Lab Calculator does not.

### Which is updated more often, Danger Notes or RayCrest Lab Calculator?

Danger Notes ships an update every 10 days, and RayCrest Lab Calculator every 2 months. Most recently, Danger Notes was updated on October 17, 2026 and RayCrest Lab Calculator on October 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.*