Comparison

Danger Notes vs RayCrest Lab Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

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
Read full description

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.

About

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.

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
Read full description

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

Danger Notes4 screens
RayCrest Lab Calculator4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Danger Notes versus RayCrest Lab Calculator: the parameters behind the verdict, then further details
ParameterDanger NotesRayCrest Lab Calculator
PriceFreeFree
Rating4.8 (2.3K ratings) — better4.7 (3 ratings)
Positive reviews83.7% of reviews—
Number of ratings2.3K — better3
Update frequencyEvery 10 days — betterEvery 2 months
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS17.017.0
Further details — not scored
Size13 MB7 MB
Age rating4+4+
DeveloperVillegas Ventures LLCRAYCREST SOFTWARE LLC

Customer experience

Danger Notes

All ratings2,289 ratings
Positive95.7%
Neutral2.5%
Negative1.8%
Written reviews129 reviews
Positive83.7%
Neutral7.8%
Negative8.5%

RayCrest Lab Calculator

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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
Show 2 more
  • Offer a desktop version
  • Implement a daily writing reminder

RayCrest Lab Calculator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

5 purchases

Danger Notes

One-time5
  • Support Danger Notes via a Tip$0.99
  • Support Danger Notes via a Tip$1.99
  • Support Danger Notes via a Tip$2.99
Show 2 more
  • Support Danger Notes via a Tip$3.99
  • Buy Me Coffee$4.99
None

RayCrest Lab Calculator

No in-app purchases

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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