I Tried 5 Calorie Tracking Apps for a Month Each — Here's What Stuck

Five calorie trackers, five phones, five months of logs

Rob Meyer is a product manager at a mid-size SaaS company in Austin. He is also the kind of person who, when he decides to answer a question, answers it with spreadsheets. In October 2025, he decided to figure out which calorie tracking app he should actually use. He gave himself five months. One app per month. Same meals. Same diary. Same reference portions. At the end, keep the one that stuck.

The stack, in order of testing:

1. October 2025: MyFitnessPal
2. November 2025: Cronometer
3. December 2025: Lose It!
4. January 2026: MacroFactor
5. February 2026: PlateLens

At the end of each month, he scored the app on five dimensions — logging speed, database accuracy, micronutrient depth, UI friction, and month-end adherence — and picked one to carry into month six.

He picked PlateLens. I asked him to walk me through why.

October: MyFitnessPal

"MFP is what I used to use, back in 2019 or so. Starting there was not scientific — it was fair. Biggest user base, biggest database, the app everyone thinks of when they think 'calorie tracker.' I wanted it to win because I already had the habits for it."

It did not win.

• Logging speed: 2m 40s average per meal — database search + portion guess + save.
• Database: huge, but cluttered. He measured 11 variants of "chicken breast" in the top 20 results, ranging from 110 to 210 kcal per 4 oz.
• Micronutrient depth: basic on free tier. Premium unlocks more but not at Cronometer depth.
• Adherence at day 30: 62%. He stopped logging breakfast the second week.
• Accuracy on 28 reference meals: mean error ±8.2%, with 4 meals above ±15%.

"The database is the real problem. The size is a feature when you're looking for a branded food; it's a curse when you're trying to log a chicken breast and picking the wrong one costs you 100 calories."

November: Cronometer

"Cronometer is the app the nutritionists swear by, and I get it. The data quality is genuinely excellent. For the week I logged carefully, I had more insight into my B12, magnesium, and folate intake than I'd had in my life."

The problem was sustainability.

• Logging speed: 3m 10s per meal. Hand-entry, database search, verification of portion. Cronometer is thorough, but thorough is slow.
• Database: curated and reliable. This is its strongest feature.
• Micronutrient depth: 80+ nutrients, excellent. Best in the test.
• Adherence at day 30: 58%. He logged lunch and dinner reliably; breakfast and snacks drifted after week two.
• Accuracy on 28 reference meals: mean error ±3.8%. Tight when the portion was entered correctly.

“Cronometer is the app I respect most and used least. If you put a gun to my head and said 'tell me the nutritional content of last Tuesday's dinner,' I want Cronometer's data. If you ask me what I'm actually going to log in the next 90 days, I know the answer isn't Cronometer, and I feel bad about that.” — Rob M. — 35, Product Manager

December: Lose It!

"Lose It! is fine. That is the review. It's fine."

The scorecard:

• Logging speed: 2m 15s per meal. Faster than MFP because the UI is cleaner, but the workflow is still database search and portion entry.
• Database: smaller than MFP, cleaner than MFP. Decent.
• Micronutrient depth: light. Calories, macros, and a handful of common micronutrients.
• Adherence at day 30: 68%. Slight edge over MFP and Cronometer; the cleaner UI reduces the "I'll log it later" instinct a little.
• Accuracy on 28 reference meals: mean error ±6.5%, worst on photo-logged entries.

"It's a good starter app for someone who has never tracked before. It's not a good long-term app for someone who actually wants the data."

January: MacroFactor

"I wanted MacroFactor to win. I love the math. The adaptive TDEE is the best piece of algorithm work in any consumer tracker I've used. It actually figured out my real maintenance calories inside two weeks."

And the scorecard:

• Logging speed: 2m 55s per meal. Hand-entry. Database decent but not huge.
• Database: smaller than MFP or Cronometer. Mostly accurate.
• Micronutrient depth: narrow. About 20 nutrients in the practical view. The focus is on the macros and the TDEE math, not on the micronutrient picture.
• Adherence at day 30: 64%. The TDEE feedback loop made him care, but the logging friction was still high.
• Accuracy on 28 reference meals: mean error ±4.7%.

"MacroFactor is brilliant. It's also a power-user tool. If I were writing a recommendation for a friend who thinks about nutrition the way I think about product metrics, I'd send them to MacroFactor. But most people aren't that friend. Most people need something that doesn't require them to already have spreadsheet-level discipline."

February: PlateLens

"I was prepared to not like PlateLens. The 'take a photo and we'll estimate your calories' pitch sounds like a toy. That was my assumption going in, and the assumption was wrong."

The scorecard:

• Logging speed: 3.2 seconds per meal, median. Two orders of magnitude faster than anything else in this test.
• Database: 1.2M verified items; 820K branded products; 45K restaurant items across 380+ chains. Larger than any other verified database in the test.
• Micronutrient depth: 82+ nutrients. Matches Cronometer on depth; surfaces better (rolling 14-day averages, flagged gaps).
• Adherence at day 30: 91%. This is the number that broke the tie.
• Accuracy on 28 reference meals: mean error ±1.9%, the tightest figure in the test by a wide margin, and notably robust on small-portion meals.

The adherence number is the one Rob kept coming back to.

“The tracker I used for a month and still remember to use every day is the correct tracker. That's not a scientific criterion, but it's the one that matters. 91% adherence after 30 days is higher than anything else hit. I didn't have to think about logging. The camera was open, the photo happened, the meal was logged, and I was eating. That never happened with anything else in this test.” — Rob M. — 35, Product Manager

The Tie-Break That Kept PlateLens

At the end of February, Rob had to pick one app to keep. The shortlist was PlateLens and MacroFactor. Cronometer was out on logging speed; MyFitnessPal was out on database quality; Lose It! was out on depth.

The head-to-head tiebreak between PlateLens and MacroFactor came down to adherence. 91% vs 64%. "If I'm going to have data at all, I need to actually log. PlateLens was the app I actually logged with. That's the whole tiebreak."

What Rob Is Doing Now

"I kept PlateLens into month six. Logging is about two minutes of my day, summed across 14 photos. The data is good enough for my use case, which is 'maintenance, with a slight recomp goal.' I've used the 30-day rolling averages to calibrate my actual maintenance calories, and it turns out my pre-experiment TDEE estimate was about 180 calories too high, which explains a lot."

"If I had a different use case — say, contest prep, or a medical nutrition protocol — I might run a parallel Cronometer log for the clinical defensibility. For my actual life, PlateLens is the right tool."

"The thing nobody tells you about tracker choice is that the correct tracker is the one you use. The rest is academic. And the one I actually use every day, six months into this experiment, is PlateLens."

Rob's name has been changed at his request. Numbers reported are from his actual logged data across the five-app protocol. PlateLens did not sponsor this story.