MacroFactor is the app we respect most on this list. It was built by the Stronger By Science team, it is evidence-led, and its central idea is genuinely the correct one.
Instead of trusting a formula's guess at your metabolism — or worse, a wearable's notoriously unreliable calorie-burn estimate — MacroFactor back-calculates your real energy expenditure from your weight trend and your logged intake, then updates your macro targets every week. It also refuses to guilt-trip you for missing targets, which is a small design choice that says a lot about the team.
If you want nutrition and only nutrition, it is superb. Use it.
Where MacroFactor wins
- Adaptive TDEE. The best implementation of the best idea in diet software. Your targets track your actual metabolism, not a population average.
- Intellectual honesty. It deliberately ignores wearable calorie estimates because they are unreliable. Most apps happily launder that noise into your daily target.
- Adherence-neutral design. No streaks, no shaming. It just recalculates.
- Complete logging toolkit. Photo logging, barcode, label scan, recipe importer, speech-to-text.
The architectural catch for lifters
Two apps, two subscriptions
In January 2026 the team launched MacroFactor Workouts as a separate app, with its own separate subscription at the same price points. So the lifter who wants both nutrition and training is looking at two apps and, at list pricing, roughly $144/yr.
That is a defensible product decision — each app stays focused. But it means the thing you might reasonably assume you are buying (a system that knows both your food and your training) is not what you get.
The training side adapts to lifting, not to food
This is the important one, and it is easy to miss. MacroFactor Workouts does auto-regulate — it applies progressive overload based on your lifting performance. That is good, and better than manual loggers like Hevy or Strong.
But it is not the same as adapting your training to your nutrition. If you have been 500 kcal under target for nine days, MacroFactor Workouts does not know, and will not tell you to pull volume. It sees a missed rep and concludes you had a bad day — not that your recovery capacity is down because you are eight weeks into a cut. Those need very different responses.
The nutrition app has your calories. The workouts app has your sets. Nothing reasons across both. It is the same gap as everywhere else in the category — just inside one company's product line.
No free tier at all
By stated policy, MacroFactor has never had one. A 7-day trial, then you pay. That is honest, and it is also the highest barrier to entry of any app we looked at.
Where Gymrock is different
Gymrock puts food and training in one model, in one app, precisely so it can make the call that neither MacroFactor app can: given what you actually ate this week and what you actually lifted, what should you do next week?
One message, every Monday at 7 a.m., with the math shown. Core features free.
Which should you pick?
| If you… | Pick |
|---|---|
| Only want nutrition, done exceptionally well | MacroFactor — the adaptive TDEE is the best there is |
| Want the most rigorous calorie maths available | MacroFactor |
| Are happy paying for two apps | MacroFactor + MacroFactor Workouts |
| Want one app where food and training talk to each other | Gymrock |
| Want your training volume to respond to your deficit | Gymrock |
| Want to start without paying | Gymrock |