Onyx Tenet
Own your nutrition. Forever.
Adaptive TDEE that learns your metabolism. No account. No ads. All data stays on your device.
Free on iPhone and Android.
Most calorie apps rent you features. This one you own.
BUILT ON PRINCIPLE
The app is yours.
Every feature works offline, forever, with no account. No subscription. No feature gates. Download and start tracking.
Your data stays on your phone.
No account required. Everything lives on your device. Optional cloud backup if you choose. Nothing leaves without your explicit action.
Works without internet.
Log meals on a plane, in a basement, in airplane mode. The app is the database. No server required.
No ads. Not now, not ever.
No banners. No interstitials. No watching a video to unlock your calorie goal. This is a tool, not an ad platform.
FEATURES
Your metabolism, learned.
Static TDEE formulas guess. Onyx Tenet calculates. A 14-day rolling window of your intake and weight change produces a TDEE that's yours, not an estimate from a textbook. The longer you track, the more precise it gets.
Intelligence, not just numbers.
Thirteen types of AI-powered insight. Trends, projections, body composition shifts, recovery windows, metabolic adaptation. Your data tells a story. Onyx reads it for you.
Point. Tap. Logged.
Aim your camera at a plate or a menu. AI returns calories, protein, carbs, and fat in seconds. Free AI estimations included. No subscription, no credit card.
Scan any label.
OpenFoodFacts powers instant lookups across 3 million products. Results cache locally. Scan once, it's yours forever. No internet required after first lookup.
Three taps. Done.
Favourites, recents, and a quick-add strip put your most-used foods one tap away. Your history builds the library. No searching through 18 million unverified entries.
Build once. Log always.
Create recipes from individual ingredients. Scan barcodes directly in the picker. Log by serving, fraction, or custom amount. No workarounds, no limitations.
Data you can act on.
Calorie and macro charts. 7-day and 30-day rolling averages. Weight vs. intake overlays. Share cards for streaks and chart periods. Clean, calm, no gamification.
THE NUMBERS
Every feature in their paid tier. No subscription required.
| Onyx Tenet | MFP | MacroFactor | Cronometer | |
|---|---|---|---|---|
| Price | Free | Free + $80/yr | $72/yr | Free + $60/yr |
| Privacy / No account | ✓ Fully local | ✗ | ✗ Account req. | ✗ Account req. |
| Adaptive TDEE | ✓ | — | ✓ | — |
| AI Insights | ✓ 13 types | — | Weekly narrative | — |
| Label Scanning | ✓ Photo OCR | — | — | — |
| Body Composition | ✓ Recomp analysis | — | — | Basic |
| Offline | Full | Partial | Partial | No |
| Ads | Never | Yes (free) | No | Yes (free) |
| Barcode scanning | ✓ Free | Premium only | ✓ | ✓ |
Switch Easily
Bring your data with you.
Import your complete food log and weight history from any major calorie tracker. One CSV file, zero data left behind.
MyFitnessPal
Diary.csv
MacroFactor
CSV export
Cronometer
Nutrition.csv
Lose It!
CSV export
Replace or merge · Food logs · Weight history · Instant
FOR EARLY ADOPTERS
THE VANGUARD PROGRAM
Get every release first, and help shape where Onyx Tenet goes next.
New releases first
Run new builds before they reach the public. Every feature and fix lands in your hands first, ahead of the App Store and Play Store.
Direct line
Your feedback goes straight to the developer. No support tickets, no bots. Request features, report bugs, and watch them ship.
The dev log
See what is being built and why. Real-time notes on every change, so you always know what just landed and what is coming next.
No marketing. Only product updates. Unsubscribe any time.