The Confidence App vs OneLine
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The Confidence App
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Confidence slipping when it matters most? The Keys Confidence course and app are a practical, proven, research-backed system aimed at addressing impostor syndrome and building confidence and resilience. Developed by Sara Seager, an MIT Professor, founded on over twenty years of experience mentoring and coaching.
OneLine
Capture your day in a single sentence with this simple journaling app. It allows you to track your mood, attach photos, and build writing streaks. Missed days can be filled in later, and your data is kept private on your device.
- One-line daily entries (up to 280 characters)
- Mood tracking with five expressive moods
- Attach photos to entries
- Fill in missed days later
- Build writing streaks
- Year in Review summary
- Biometric app lock (Premium)
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One line. Every day. Your story. OneLine is the beautifully simple journal that helps you capture each day in a single sentence. No pressure, no long-form writing, just one meaningful line that captures your moment. DAILY JOURNALING, SIMPLIFIED - Write one line per day (up to 280 characters) - Track your mood with five expressive moods - Attach photos to preserve visual memories - Daily writing prompts to spark inspiration MISSED A DAY? WRITE IT ANYWAY - Open any past day and fill it in later - A day you forgot is never locked away - Filling a gap puts your streak back together - Free, because writing in your own diary should be TRACK YOUR JOURNEY - Build writing streaks and stay consistent - See at a glance which days you journaled - Tap any day to open it right from your stats - See mood trends and patterns over time - On This Day: rediscover entries from past years YEAR IN REVIEW - Beautiful, interactive annual summary - Mood charts, writing activity graphs, and more - Tap any chart for detailed insights - Share your Year in Review as an image YOUR DATA, YOUR PRIVACY - Entries stay on your device and sync privately - Export your journal anytime as PDF or text - No ads, no tracking, no data collection - Lock your journal with biometric authentication (Premium) PREMIUM (One-time purchase, yours forever) - Photo memories on every entry - Biometric app lock - Streak shield: covers one forgotten day a month - Support independent development Everything else stays free: unlimited entries, filling in days you missed, search, export, activity map, Year in Review, On This Day, mood tracking, stats and cloud sync. Start your one-line-a-day habit today. It takes 30 seconds, but the memories last forever. --- Privacy Policy & Terms of Use: https://merzkevin.de/privacy-OneLine.html
Screenshots
Verdict
The clearest difference is in-app purchases: The Confidence App at none against OneLine's 1. OneLine's advantage is update cadence (every 10 days vs monthly). On price, ads, 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. OneLine sells 1 one-off in-app purchase. The Confidence App asks for nothing beyond the download.
The Confidence App ships an update monthly, OneLine every 10 days. The most recent releases landed on November 9, 2026 and October 31, 2026 respectively.
| Parameter | The Confidence App | OneLine |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Monthly | Every 10 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 57 MB | 3 MB |
| Age rating | 17+ | 4+ |
| Developer | Epiphyte LLC | Kevin Merz |
In-app purchases
The Confidence App
No in-app purchases
OneLine
- Premium$2.99
Questions
Is The Confidence App free?
Is OneLine free?
Do The Confidence App or OneLine have ads?
Which is updated more often, The Confidence App or OneLine?
Other comparisons
