Comparison

Lucent vs CogniLog

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

Head to head
About

Lucent

Features
Read full description

Lucent uses neuroscience-backed visual focus training to prepare your brain for deep, distraction-free work in just 60 seconds. HOW IT WORKS Stare at a glowing horizontal line. Watch mesmerizing flares rise and fall. Let your gaze naturally focus. In 60 seconds, your brain's attention circuits activate and you're ready for hours of focused work. THE SCIENCE Based on research from Stanford's Huberman Lab, visual focus on a single point for 30-60 seconds triggers neurochemical changes that enhance concentration, increase goal-directed behavior, and reduce perceived effort during cognitive tasks. Key research: Visual focus increases task performance by 23% and reduces effort by 17% (NYU Study, Psychological Science 2019). WHY IT WORKS Your visual system is the gateway to your attention. By training your eyes to focus on a single point, you activate the neural circuits responsible for sustained concentration. This isn't meditation—it's neurochemical priming. WHAT YOU GET • 60-second visual focus sessions • No ads, no subscriptions • Science-backed methodology

About

CogniLog

This app helps you document your work, capturing decisions and reasoning. It allows an AI assistant to read your log and answer questions about your past activities. Entries are plain text with Markdown support, and a visual almanac helps you navigate your history.

Highlights
  • AI-powered work log analysis
  • Plain text entries with Markdown
  • Visual almanac for historical navigation
  • Project-based channels and #tags
  • Cross-device sync via iCloud
  • Import from other note-taking apps
Features
Read full description

CogniLog is a work log for anything worth remembering. It captures the story behind your work: the decisions, the dead ends, and the reasoning you would otherwise forget. Whether your days are made of code, meetings, deliverables, chapters, or experiments, you write it down once and get it back whenever you need it. The work log your AI can read. CogniLog's macOS version comes with a built-in connection (an MCP server) that lets an AI assistant you already use, like Claude, read your log and answer questions about your own work, even entries authored in the iOS version. Ask what you were doing last week, or why you made a call three months ago. Your assistant can even add entries of its own, so the two of you share one space that you both write to and read from. Write the way you already write. Entries are plain text with light Markdown, and they format as you type. Headings become headings, code becomes code. Drop in a #tag and CogniLog files it for you, and channels keep each project or context separate. No forms, no fields, just the log. See the year, drill to the moment. Capture is only half the job. The Almanac turns your log into a map. Scan whole months at a glance, hover any day for a summary of what happened, and drill from the year down to a single entry. Come back from a busy week, or a week away, and pick the thread back up. Built native, and it feels it. A real Mac app and a real iPhone app, not a website in a wrapper. Log from your Mac while you work, or catch a thought on your phone while you wait in line. Capture meets you where you are, from the menu bar to the lock screen widget, with optional daily and streak reminders. Yours, and only yours. No new accounts and no servers of ours. Your log stays on your devices and syncs through your own iCloud when you want it everywhere. Using the macOS version bring your history in from apps like Apple Notes, Day One, Obsidian, and Bear, or any Markdown files, viewing it on your iOS device; and take it all back out as plain Markdown any time. No lock-in, no ads, no tracking. Currently free. Everything in the app is free right now. If that ever changes, it won't change for the people already here. CogniLog is made by Rivet and Rune, a small studio building native tools and experiences.

Screenshots

Lucent3 screens
CogniLog4 screens

Verdict

The call

The clearest difference is iOS requirement: Lucent at 15.1 against CogniLog's 26.2. On price, ads, 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.

Scorecard1 real difference · 9 level
Lucent versus CogniLog: the parameters behind the verdict, then further details
ParameterLucentCogniLog
PriceFreeFree
Rating—5.0 (3 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—3 — better
Update frequency—Every 6 days
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone, Mac
Requires iOS15.1 — better26.2
Further details — not scored
Size36 MB51 MB
Age rating4+4+
DeveloperIgor StebliiRivet Rune LLC

In-app purchases

None

Lucent

No in-app purchases

None

CogniLog

No in-app purchases

Questions

Is Lucent free?
Lucent is free to download, with no in-app purchases.
Is CogniLog free?
CogniLog is free to download, with no in-app purchases.
Do Lucent or CogniLog have ads?
Neither Lucent nor CogniLog shows ads.

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