Lumen vs MyNetDiary
Lumen and MyNetDiary compared on features, pricing and Editor Score — to help you pick the right health & lifestyle tool in 2026.
Quick verdict
Our Editor Score puts MyNetDiary 0.2 points ahead. Pick Lumen if you want handheld CO2 sensor with flow meter; choose MyNetDiary for staff-verified database of over two million foods with up to 108 nutrients per entry. On pricing, MyNetDiary is the one with a free or freemium plan, so it's the cheaper place to start.
Lumen vs MyNetDiary at a Glance
| Pricing | Subscription | Freemium |
| Free tier | ||
| Best for | handheld CO2 sensor with flow meter | staff-verified database of over two million foods with up to 108 nutrients per entry |
Lumen
Lumen is a portable metabolic device using a CO2 sensor and flow meter to read the carbon dioxide concentration in a single breath, indicating which fuel your body is using. It builds a daily plan of what to eat and when, flags muscle-loss risk, and guides fuelling around workouts.
- Puts a measurement that required a laboratory into a pocket
- Cites peer-reviewed validation rather than claiming to be science-backed
- University collaborations named rather than implied
- Removes calorie counting, which almost nobody sustains
- Infers from one gas where laboratory testing measures two
- Validation of the measurement is not validation of the outcome
- Transformation testimonials are selected individual results
MyNetDiary
MyNetDiary tracks calories and nutrition against a staff-verified database of more than two million foods carrying up to 108 nutrients each, with barcode scanning, AI photo logging, restaurant menu analysis, wearable integrations and dedicated support for GLP-1 medication users.
- Staff-verified database sourced from USDA and research data, rather than crowd-sourced entries of unknown quality
- Nutrient depth of up to 108 fields goes far beyond the calories-and-macros most trackers stop at
- Free tier keeps barcode scanning and full nutrient detail, so accurate logging costs nothing
- No advertising in an app you open several times a day around food and weight
- AI photo logging estimates portions from a two-dimensional image, which is inherently imprecise and unfixable
- The interface presents photo estimates with the same authority as scanned barcodes, which invites false confidence
- Stated user numbers and operating history are vendor claims with no published basis
Which Should You Choose?
Choose Lumen if…
- you want handheld CO2 sensor with flow meter
Choose MyNetDiary if…
- you want staff-verified database of over two million foods with up to 108 nutrients per entry
- a free or freemium plan is important
Lumen vs MyNetDiary: The Verdict
There's no one-size answer here: Lumen leans into handheld CO2 sensor with flow meter, while MyNetDiary is built for staff-verified database of over two million foods with up to 108 nutrients per entry. Weigh features and pricing for your workflow. MyNetDiary is the lower-cost place to start thanks to its free or freemium plan; the other is worth a trial if its feature set fits better.
Frequently Asked Questions
Is Lumen better than MyNetDiary?
Neither is universally better — it depends on your budget and which features matter most. The side-by-side breakdown above shows where each one wins.
What is the difference between Lumen and MyNetDiary?
Lumen (subscription) is best for handheld CO2 sensor with flow meter, while MyNetDiary (freemium) is best for staff-verified database of over two million foods with up to 108 nutrients per entry. See the full feature and pricing comparison above.
Is Lumen or MyNetDiary cheaper?
MyNetDiary has a free or freemium plan, so it's the cheaper way to start. For paid plans, check each tool's current pricing on its review page.
Which is better for beginners, Lumen or MyNetDiary?
MyNetDiary is usually the easier starting point thanks to a lower barrier to entry. Beginners should favour a free tier and a simple interface over raw power.
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About the Authors
AI Tools Comparison Analyst
Olivia runs side-by-side comparisons and benchmarks, digging into pricing, features, and real-world performance so readers can choose between competing AI tools with confidence.
Senior AI Tools Reviewer
Daniel reviews AI tools the slow way — by actually using them on real projects. His reviews cover what works, what breaks, and who each tool is genuinely a good fit for.
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Last updated October 2026. Comparisons are ranked by our Editor Score (features, value and pricing, blended with verified user reviews where a tool has them) — see our methodology.