# Delta: TDEE Tracker — TDEE & Calorie Tracker > TDEE & Calorie Tracker (iPhone/iPad app by Marcel Timm.) - Source: https://appshunter.io/ios/app/delta-tdee-tracker/id6753978074 (this page in markdown: same URL + `.md`) - Developer: [Marcel Timm](https://appshunter.io/developer/1846068948) - Category: Health & Fitness, Lifestyle - Price: Free with in-app purchases (on sale, was $2.99) - Age rating: 17+ - Requires: iOS 17.0 · 17 MB - Languages: English - Released: 2026-01-07 - Data updated: 2026-08-27 - User reviews in markdown: https://appshunter.io/ios/app/delta-tdee-tracker/id6753978074/reviews.md ## What is Delta? Delta tracks your weight and calorie intake and calculates your real TDEE — not a formula estimate, your actual one. 10 days free. One payment for unlimited access. No subscription. Most apps give you a TDEE based on height, weight, age, and activity level. That number is a population average applied to you. It's a starting point, not a measurement. Delta starts there too, but transitions away from it as you log real data. By day 10 your estimate is derived entirely from what you actually eat and how your weight actually moves. The longer you log, the more accurate it gets. Log your weight each morning and your calorie intake each day. Delta averages the last 10 days to filter out noise from water retention and normal fluctuation. It combines your intake with observed weight change to estimate your true maintenance calories, then smooths that estimate over 28 days to avoid overreacting to short-term variance. The result is a daily calorie target adjusted for your goal — cut, maintain, or bulk — grounded in your data rather than population averages. Key features: Daily weight and calorie logging Adaptive TDEE that transitions from formula to fully empirical as you log 28-day smoothing for a stable, actionable number Goal-based calorie targets for cut, maintain, or bulk Apple Health integration — weight and TDEE baseline written automatically Daily reminders for weigh-in and calorie logging Why Delta? Δ is the symbol for change. Your weight change and calorie balance are what actually determine your TDEE. Delta measures both and gives you a number that reflects your reality, not someone else's average. ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Delta Unlimited | $2.99 | one-time | ## Version history (last 4 releases) ### 1.4 — 2026-04-07 Apple Health Delta now writes your daily weight and empirical TDEE baseline to Apple Health. Enable it in Settings → Write to Apple Health. Only one record per day is written — saving multiple times updates the existing entry rather than creating duplicates. Reminders Two separate daily reminders are now available in Settings — one for your morning weigh-in, one for your evening calorie log. Each has its own toggle and time picker so you can configure them independently. Journal improvements The journal now shows every day from your first entry to today. Missing days are clearly marked and can be filled in retroactively — including weight, with an interpolated estimate shown as a starting point. This makes it easy to catch up on days you forgot to log. Progress charts Weight and calorie charts now show a trend line. Start weight, current weight, and total change are shown below the weight chart. TDEE Calculation view The calculation detail view has been cleaned up. Once your estimate is fully empirical, redundant status text and the blended TDEE line are hidden. Lifetime progress and distance to goal are now shown alongside the window delta. About Delta The How It Works section now accurately describes Delta's actual calculation method, including the formula-to-empirical transition timeline and the 28-day smoothing window. Under the hood Shared data layer, static date formatters, and extracted calculation helpers — all invisible to users but making the app more reliable and easier to maintain going forward. ### 1.3 — 2026-03-27 This update is focused on under-the-hood improvements and UI polish. Reliability All parts of the app now share a single data store, so changes made in one screen are immediately reflected everywhere else without needing to restart or navigate away. Daily view Saving your entry now shows a brief confirmation banner instead of an alert you have to dismiss. The weight field gives you a clearer signal when it's required before saving. Lock and unlock actions now have a subtle haptic response. Journal Edited calorie entries briefly highlight to confirm they've been saved. Progress Charts now show a navigation title and the calorie summary layout has been cleaned up. TDEE Calculation view Once your estimate is fully established from your own data, the view no longer shows redundant status text — it simply confirms the estimate is active and shows your calculation detail. Settings The unlock button for Delta Unlimited is always accessible regardless of how many days you've logged. ### 1.2 — 2026-03-23 Delta is now free to try. Log your weight and calories for 10 days at no cost. Once your personal TDEE is fully established from your own data, a one-time purchase unlocks unlimited logging — no subscription, no recurring charge, ever. If you've used Delta before, you're automatically unlocked. Nothing to do. ### 1.1 — 2026-01-07 No release notes. ## More apps by Marcel Timm - [Prokopton](https://appshunter.io/ios/app/prokopton/id6754165468) All apps by Marcel Timm: https://appshunter.io/developer/1846068948 ## Related topics [tdee tracker](https://appshunter.io/ios/topics/tdee-tracker) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*