Comparison

Optogenetics Pro vs Diary Fast

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

Head to head
About

Optogenetics Pro

This tool helps researchers calculate the necessary optical power for optogenetics experiments involving light delivery to deep brain areas. It considers brain region scattering properties, opsin type, and optical fiber characteristics to estimate excitation depth as a function of optical power.

Highlights
  • Calculate required optical power
  • Estimate opsin excitation depth
  • Model light scattering in brain tissue
  • Input brain region properties
  • Input opsin properties
  • Input optical fiber properties
Features
Read full description

Optogenetics Pro is a tool which aids an investigator in calculating the required optical power for a given in-vivo experiment involving optogenetics or any other experimental approach that includes light delivery to deep brain areas via optical fibers. Different brain areas have different optical properties, which determine how light scatters and distributes, once it exits the optical fiber. To estimate the amount of light required for a given experimental design, knowledge about the specific scattering properties of the brain region of choice, the specific opsin to be used, and the properties of the optical fiber are required. Once a user inputs these parameters into the APP, it calculates the maximal depth at which excitation of the opsin can be expected. The penetration depth is plotted as a function of optical power (mW), such that a user can see how light scatters in the brain tissue under the specific circumstances. For the scientific basis of this calculator, please see Al-Juboori, Dondzillo, Stubblefield, Felsen, Lei, and Klug: Light scattering properties vary across different regions of the adult mouse brain, PlosONE, e67626(8) 2013. For additional information, please see www.optogeneticsapp.com. The pro and regular versions of the app are identical.

About

Diary Fast

Features
Read full description

Diary Fast – Private Daily Journal Record your thoughts, memories, and everyday moments quickly and easily. Diary Fast is a simple and private journal app designed for capturing life's important moments anytime, anywhere. Whether you want to write about your daily experiences, save personal reflections, track your goals, or keep meaningful memories, Diary Fast helps you create your own personal space. Fast & Simple Writing Start writing whenever inspiration comes. Create journal entries in just a few taps with a clean and intuitive experience designed for everyday use. Your Private Journal Your diary entries are stored locally within the app, giving you control over your personal records. No account is required, and your memories stay within your device. Keep Your Memories Organized Easily browse your previous entries and revisit special moments from your past. Keep your thoughts, ideas, and experiences organized in one place. Write Anywhere, Anytime Diary Fast works offline, allowing you to record your thoughts whenever you need, even without an internet connection. Designed for Everyday Life Use Diary Fast for: Daily journaling Personal reflections Travel memories Gratitude notes Life experiences Ideas and inspiration Personal goals Your story is unique. Start writing it today with Diary Fast — a simple way to capture, organize, and remember your moments.

Screenshots

Optogenetics Pro4 screens
Diary Fast4 screens

Verdict

The call

The clearest difference is ads: Optogenetics Pro at none against Diary Fast's shown. Diary Fast's advantage is update cadence (every 8 days vs every 45 months) and iOS requirement (13.0 vs 17.0). On price, in-app purchases 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Optogenetics Pro ships an update every 45 months, Diary Fast every 8 days. The most recent releases landed on October 7, 2026 and September 23, 2026 respectively.

Scorecard3 real differences · 6 level
Optogenetics Pro versus Diary Fast: the parameters behind the verdict, then further details
ParameterOptogenetics ProDiary Fast
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 45 monthsEvery 8 days — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS17.013.0 — better
Further details — not scored
Size365 MB69 MB
Age rating4+4+
DeveloperPopneuron Ltd.Ashore Limited

In-app purchases

None

Optogenetics Pro

No in-app purchases

None

Diary Fast

No in-app purchases

Questions

Is Optogenetics Pro free?
Optogenetics Pro is free to download, with no in-app purchases.
Is Diary Fast free?
Diary Fast is free to download, with no in-app purchases.
Do Optogenetics Pro or Diary Fast have ads?
Diary Fast shows ads; Optogenetics Pro does not.
Which is updated more often, Optogenetics Pro or Diary Fast?
Optogenetics Pro ships an update every 45 months, and Diary Fast every 8 days. Most recently, Optogenetics Pro was updated on October 7, 2026 and Diary Fast on September 23, 2026.

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