Frequently Asked Questions

D³ (Daily Diet Diary) is a personal nutrition and wellness tracking app for iPhone and Android. You log your meals, exercise, how you felt, and a diet quality score each day. Over time, the app builds trends, charts, and patterns — all privately on your device, with no accounts and no internet required.

No. D³ requires no account, no sign-up, and no email address. You open the app and start logging. Your data stays on your device.

Yes, completely free. D³ has no ads, no in-app purchases, no premium tier, and no subscription. All features are available to everyone from the moment they download the app.

Yes. D³ works 100% offline. It doesn't connect to the internet for any feature. You can log entries, view trends, and generate reports without any network connection.

No — and that's intentional. D³ takes a different approach: you log what you ate in plain language (e.g., "grilled chicken, salad, olive oil dressing") and then give yourself a QUAL (diet quality) score from 0–100. This is faster than calorie counting and encourages reflection rather than arithmetic. Research suggests that diet quality awareness can be as effective as calorie tracking for many people.

QUAL is your subjective diet quality rating for the day, from 0 to 100. You decide what counts as a good day based on your own goals and standards. The app color-codes scores into four tiers: Excellent (≥85%), Good (≥70%), Watch (≥55%), and Poor (<55%). Over time, weekly and long-term averages reveal your trend.

S&S tracks your "indulgence servings" — things like desserts, chips, alcohol, or whatever you personally consider an indulgence. You define what counts as one serving in Settings, and you set a weekly budget (default: 12 servings/week). The app shows weekly totals and flags when you're over budget.

Yes. You can log any number of exercise sessions per day. Distance-based types (Walk/Hike, Run, Bike) are measured in miles; duration-based types (Gym, Yoga, Work, and others) are measured in hours and minutes. You can add a custom label to each session (e.g., "Morning yoga" vs. "Evening flow").

In Settings, you create custom tags for symptoms, moods, or any other conditions you want to track — like "Knee Pain," "Brain Fog," "Low Energy," or "Felt Great." On any given day, you can select applicable tags and add a freeform health note. These tags power the Trends charts and the Correlations engine.

As far back as you've been logging. The Trends view offers 3M, 6M, 1Y, and ALL options. The ALL setting shows every week of data on your device. Calendar and List views let you browse any past date.

Each bar represents one week of data. Bar height is proportional to that week's value relative to the peak in the selected range. The number shown to the right of each row is a meaningful aggregate — an average (for QUAL and S&S) or a total (for exercise hours, health tag days) across the entire range, not the scale maximum.

In the Month tab, tap the share icon (↑) in the header to export a monthly PDF, or choose a week from the "Weekly Report" card and tap Share. In the History tab (Trends view), tap the share icon in the date range row to export a trends report. Reports open your device's standard share sheet — AirDrop, Mail, Save to Files, print, and more.

Correlations are statistical patterns D³ detects between things you consume or do (food attributes, medication changes) and your health tag outcomes. The Correlations card appears on the Month and History/Trends screens once you have at least 30 logged entries. If no patterns meet the statistical thresholds, the card stays hidden — it only appears when there's something real to show.

Medication correlations require (1) a medication change event logged in Settings → Medications, (2) at least the lag period plus 7 days since the change (default lag: 30 days, so 37 days total), and (3) at least 3 logged entries before the change and 7 entries after. If you started tracking D³ at the same time as a medication change, there may be no "before" data to compare against, which means a meaningful comparison isn't possible yet.

In Settings → Foods, you can mark a food attribute as "watching" and specify a lag window (how many days after eating that food you might feel effects). When entering Meals, meal "chips" are automatically saved. Long press a chip and mark it with that food attribute (e.g., "Dairy" or "Gluten." D³ then scans your meal notes for days when you logged foods with that attribute, compares your health tag rates on those days (with lag applied) versus days without that food, and surfaces a result when the difference is ≥15% and the rates are high enough to be meaningful.

All your data is stored locally on your device using the operating system's built-in secure local storage. Nothing is synced to a cloud server, backed up to our systems, or transmitted anywhere.

When you uninstall D³, all your data is permanently deleted from your device. Because we have no cloud backup, this data cannot be recovered. If you want to preserve your history before uninstalling, export your reports as PDFs first.

Currently, D³ doesn't have a built-in export/import tool for migrating raw data between devices. If you back up your phone and restore from that backup to your new phone, apps using local storage are typically included in the backup, depending on your device settings. Check your iOS or Android backup settings to confirm. This is a feature we're considering for a future version.

No. D³ contains no analytics SDKs, no crash reporters, no usage tracking, and no telemetry of any kind. We have no visibility into how you use the app.