Lumen vs TodayFlow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lumen
This app acts as a browser that remembers what you read, building a personal knowledge base from engaged pages. It allows you to ask questions in plain English about your reading history, with answers generated by an on-device AI. All your data remains private and offline.
- On-device AI knowledge base
- Plain English questioning
- Automatic content organization
- Private and offline browsing
- Tracker blocking
- Source citation for answers
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Lumen is a browser with a memory. Most browsers forget the second you close a tab. Lumen does not. As you read, it quietly builds a personal knowledge base from the pages you actually engage with, and then lets you ask questions about any of it in plain English, answered by an AI model that runs entirely on your device. Nothing you read, nothing you ask, and nothing Lumen learns about you ever leaves your phone. WHAT IT DOES Lumen reads along with you. It distinguishes between pages you genuinely read and pages you opened and swiped away, and it extracts the meaningful content from the ones that stuck. That content gets summarized, embedded, and organized into a searchable knowledge base, all on-device. Later, when you want to find something, you do not have to dig through history or remember which tab it was in. You just ask: "What did I read about sourdough starters last week?" "Summarize that article about the new M-series chips." "What were the main arguments in that piece I read on Tuesday?" Every answer cites the pages it came from, so you can jump straight back to the source. AUTO-ORGANIZED Your reading sorts itself into a clean hierarchy: Topics, Websites, and Pages. Each level carries its own AI-generated summary, so you can scan what you have been learning at a glance. No tagging, no folders to maintain. Lumen handles it in the background. PRIVATE BY DEFAULT Lumen has no server. There is quite literally nothing to send. On-device LLM: a quantized Llama 3.2 model runs locally through Apple's MLX framework. Local SQLite storage: your reading history, summaries, and embeddings never leave the device. Built-in privacy: tracker blocking, third-party cookie blocking, and fingerprint resistance. Secure: HTTPS-only by default, with mixed-content blocking. No strings attached: no accounts, no sync, no telemetry, no ads. The AI weights download once on first launch (~700 MB). After that, everything works fully offline: browsing, reading, asking, answering. BUILT FOR iOS Lumen is written from scratch in Swift and SwiftUI, designed specifically for iPhone and iPad. It uses Apple's own frameworks wherever it can: NLEmbedding for semantic search, WKWebView for browsing, SQLite with FTS5 for full-text queries, and MLX Swift for on-device inference. Zero third-party trackers. Zero external services. WHO IT'S FOR While most browsers treat the web as a feed to scroll past, Lumen treats it as a library worth keeping. If you read a lot online and constantly think "I know I saw something about this recently but I cannot find it again," Lumen is for you. Researchers, students, writers, developers, and lifelong learners. You do not need to change how you browse. Browse normally, and Lumen takes care of the rest. REQUIREMENTS iOS 18 or later. iPhone with Apple Silicon recommended for the fastest on-device AI performance.
TodayFlow
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Take control of your day in one simple place. TodayFlow helps you capture what matters today without jumping between multiple apps. Type or speak naturally, and quickly log tasks, reminders, mood, expenses, and daily plans in seconds. Whether you need to remember something important, track how you feel, log spending, or review your schedule, TodayFlow keeps everything organized in a clean daily dashboard. WHY TODAYFLOW Smart daily input Write or say what happened, and TodayFlow helps turn it into the right entry. Quick task and reminder capture Log to-dos, due items, and reminders fast so nothing gets missed. Mood tracking made simple Check in with your mood and build a clearer picture of your days. Easy money log Track daily spending with quick expense entries and simple categories. Daily agenda view See your day at a glance with tasks, reminders, and events in one place. Useful home screen widgets Keep an eye on your priorities, upcoming items, mood, and daily totals without opening the app. Designed for low-friction planning TodayFlow is built for speed, clarity, and simple daily organization. GREAT FOR People who want one daily dashboard Users who track both life and productivity Anyone who wants a faster way to log daily activity People who prefer simple planning over complicated systems USE TODAYFLOW TO Plan your day Track your tasks Log reminders Monitor your mood Record expenses Review your agenda Stay focused with widgets TodayFlow gives you a lighter, smarter way to manage everyday life.
Screenshots
Verdict
The clearest difference is update cadence: TodayFlow at every 5 days against Lumen's every 2 weeks. 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Lumen ships an update every 2 weeks, TodayFlow every 5 days. The most recent releases landed on June 28, 2026 and September 22, 2026 respectively.
| Parameter | Lumen | TodayFlow |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 weeks | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone | iPhone |
| Requires iOS | 18.0 | 17.0 — better |
| Further details — not scored | ||
| Size | 28 MB | 2 MB |
| Age rating | 17+ | 4+ |
| Developer | Daniel Kosukhin | Vu Thi Hanh |
In-app purchases
Lumen
No in-app purchases
TodayFlow
No in-app purchases





