Danger Notes vs RayCrest Lab Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Danger Notes
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.
- Continuous typing required to save
- Work deleted if typing stops
- Fights writer's block
- Encourages writing flow
- Suitable for essays, books, and lyrics
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Don’t stop typing. If you do, all your work will disappear and be gone forever. Danger Notes is the ultimate writing tool to help fight writer’s block. Whether you are writing a term paper, an essay, a book, your best-man speech, promising rap lyrics or just free writing, Danger Notes will help you fight writer’s block by forcing you to keep writing in order to save your progress from being deleted. The theory behind this wonderful writing tool, is that by pressuring you to keep writing, you will be forced to formulate an actual flow of written work instead of just staring at a blank document for 2 hours with no progress to show for. The more words you type the easier it will be to break past your writer's block and keep typing. Break writer's block with Danger Notes.
RayCrest Lab Calculator
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.
- Buffer preparation guidance
- Henderson-Hasselbalch recipes
- Stock mixing and titration
- Solution and dilution calculations
- Mass/volume conversions
- Protocol timers
- Saved recipes and compounds
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RayCrest Lab Calculator is a bench-side calculator for researchers, students, and lab teams who prepare buffers, solutions, dilutions, and timed protocols. Turn buffer parameters into practical prep guidance. Choose a buffer, set target pH, concentration, volume, temperature, and preparation preference, then generate steps for weighing solids, mixing stocks, or titration. Built-in tools include: - Buffer charts and filterable buffer selection - Henderson-Hasselbalch buffer recipes - Stock mixing and titration guidance - Solution and dilution calculations - Mass/volume, mole/volume, and molarity conversions - Protocol timers for repeated lab steps - Optional compound lookup and manual molecular weight entry - Saved recipes, compounds, and preferences Designed for iPhone and iPad, RayCrest Lab Calculator keeps everyday lab math organized in one place. Use quick calculations at the bench on iPhone, or the larger iPad layout for planning recipes, viewing buffer ranges, and checking multiple values. Local by default: Saved recipes, compounds, and preferences are stored locally on your device. The app does not include analytics, advertising SDKs, or tracking frameworks. Manual calculators work without online lookup; optional compound search may use network access only when you choose to look up compound information. RayCrest Lab Calculator is a calculation aid for research and educational lab workflows. Always verify units, pH, reagent compatibility, and safety requirements before preparing reagents.
Screenshots
Verdict
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.
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. 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.
| Parameter | Danger Notes | RayCrest Lab Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (2.3K ratings) — better | 4.7 (3 ratings) |
| Positive reviews | 83.7% of reviews | — |
| Number of ratings | 2.3K — better | 3 |
| Update frequency | Every 10 days — better | Every 2 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, Apple Watch — better |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 13 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Villegas Ventures LLC | RAYCREST SOFTWARE LLC |
Customer experience
Danger Notes
RayCrest Lab Calculator
Bugs and requests
Danger Notes
Reported bugs
3 issues- Accidental deletion of work
- Overlapping text when reaching page limit
- Glitches after updating to iOS 16
Requested features
7 requests- 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
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- Offer a desktop version
- Implement a daily writing reminder
RayCrest Lab Calculator
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Danger Notes
- Support Danger Notes via a Tip$0.99
- Support Danger Notes via a Tip$1.99
- Support Danger Notes via a Tip$2.99
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- Support Danger Notes via a Tip$3.99
- Buy Me Coffee$4.99
RayCrest Lab Calculator
No in-app purchases
Questions
Is Danger Notes free?
Is RayCrest Lab Calculator free?
Which has better reviews, Danger Notes or RayCrest Lab Calculator?
Do Danger Notes or RayCrest Lab Calculator have ads?
Which is updated more often, Danger Notes or RayCrest Lab Calculator?
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