Diary vs fuelOS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Diary
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Rich Text Journaling Beautiful Writing Experience: Create stunning journal entries with professional formatting options. Creative Expression: Use bold, italic, underline, headings, lists, quotes, and colors to make your entries come alive. Visual Storytelling: Add photos and images to capture memories alongside your words. Flexible Formatting: Customize your writing with indentation, links, and text highlighting for a truly personal touch. Smart Task Management Plan Your Days: Create and organize tasks with due dates and reminders to stay on track. Recurring Tasks: Automate your routines with daily, weekly, or custom recurrence options. Priority Labels: Highlight what matters most using customizable priority levels. Seamless Organization: Group and sort tasks by date, priority, or completion status—just like Google Tasks. Focus & Productivity: Keep your journal, goals, and daily plans all in one place for a calm, organized mind. Quick Actions: Check off completed tasks instantly and feel the satisfaction of progress. Mood Tracking & Self-Discovery Daily Mood Check-ins: Track your emotional well-being with an intuitive 5-point mood scale. Emotional Insights: Discover patterns in your mood and identify what affects your happiness. Visual Progress: See your emotional journey through beautiful charts and graphs. Personal Growth: Understand your emotional triggers and celebrate your progress over time. Multimedia Memory Keeping Photo Integration: Attach meaningful photos to your journal entries. Visual Gallery: Browse all your cherished memories in one beautiful gallery. Seamless Uploads: Easily add and manage images without disrupting your writing flow. Smart Organization Custom Tags: Create personalized tags to categorize your thoughts, moods, and tasks. Easy Search: Quickly find specific entries or tasks by tags, dates, or content. Time Travel: Relive past moments by filtering entries from any time period. Premium Benefits Cloud Sync & Peace of Mind Automatic Backup: Never lose your precious memories with seamless cloud backup. Access Anywhere: Continue your journaling and task planning across all your devices. Data Security: Your personal thoughts remain private and secure. Personal Security Biometric Unlock: Quick access with fingerprint or face recognition. PIN Protection: Extra security layer for your most intimate entries. Auto-Lock: Automatic protection when you're away. Personalization Dark/Light Mode: Comfortable writing in any lighting condition. Color Themes: Choose the perfect color scheme for your creative space. Font Selection: Select beautiful fonts that match your writing style. Universal Accessibility Global Language Support 18+ Languages Thoughtful Experience Gentle Reminders Daily Motivation: Optional gentle notifications to help you maintain your journaling and task habits. Guided Start: Helpful example entries and tasks to inspire your first steps. Why You'll Love It Transform your daily reflections, moods, and goals into a beautiful, organized journey of self-discovery. Whether you’re tracking your emotions, planning your day, or documenting life’s moments, this app helps you stay balanced, mindful, and inspired. Start your journey today—your future self will thank you for every note, mood, and task you complete.
fuelOS
Effortlessly track your nutrition with AI-powered food logging. Simply snap a photo, speak your meal, or scan a barcode to instantly understand your intake. Gain actionable insights into your diet to live healthier without the hassle of manual calorie counting.
- AI-powered food logging
- Photo, voice, and barcode scanning
- Effortless nutrition tracking
- Actionable dietary insights
- Micronutrient tracking (Pro)
- HealthKit integration (Pro)
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Everything you put in your body. One place. Food. Supplements. How you feel. Logged in the order you live them. fuelOS is built for people who take what goes in seriously. Anyone can pick it up. CAPTURE IN ONE GESTURE Snap a photo. Speak. Scan a barcode. The card appears and fills in as it reads, section by section. No forms. THE STACK Your supplements, vitamins, powders, and the rest of your routine, in one view. Point the camera at the bottle to add it. Log a dose in one tap from your Home Screen. Set reminders, then log, skip, or snooze. DOWN TO THE COMPOUND Macros and micronutrients, estimated by AI from the photo. fuelOS also estimates bioactive compounds in your food, like curcumin and beta-glucans. The detail you usually have to hunt for is already on the card. Estimates carry a ~, so a guess never reads like a scanned label. HOW YOU FEEL A daily check-in for energy, mood, and focus. Logged beside what you ate that day. CARRY IT EVERYWHERE Quick-log from the Home Screen widget or with Siri and Shortcuts. Meals and macros sync to Apple Health. Turn a streak or a strong day into a clean card, stating one true fact about your own data. FREE TO START A few free AI meal scans a day. Re-logging a past meal is always free. fuelOS PRO Unlimited logging. Micronutrient estimates. The analytics dashboard. Apple Health. Export your data, anytime. Take what goes in seriously. Start here. fuelOS uses AI to estimate nutrition from meals you log. All nutritional data is approximate and for informational purposes only. This app is not intended to diagnose, treat, cure, or prevent any disease or health condition. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about your diet or health. You may find the citations for peer-reviewed research papers we utilize to set the default values for calories and macros in Settings → Footer → "Sources" Terms of Use: https://fuelos.site/terms Privacy Policy: https://fuelos.site/privacy License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is ads: fuelOS at none against Diary's shown. Diary's advantage is update cadence (every 4 days vs every 3 weeks) and device support (3 vs 1). On price and in-app purchases 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. Diary sells 3 in-app purchases, starting at $0.99 per month and fuelOS sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
Diary ships an update every 4 days, fuelOS every 3 weeks. The most recent releases landed on October 14, 2026 and October 19, 2026 respectively.
| Parameter | Diary | fuelOS |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (12 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 12 — better |
| Update frequency | Every 4 days — better | Every 3 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 96 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Felipe Almeida | Abay Bektursun |
In-app purchases
Diary
- Monthly$0.991 Month
- 3 months$2.993 Months
- Annual$5.991 Year
fuelOS
- fuelOS Pro Monthly3 Days trial$9.991 Month
- fuelOS Pro Annual3 Days trial$89.991 Year









