SmartCrunch vs MacroFactor

The short answer#

Of everything in this category, MacroFactor is the app whose central idea is closest to ours. Both work out what you actually burn from what you actually logged, rather than predicting it from height, weight, age and a dropdown. On this site that mechanism is described as rare, and MacroFactor is the reason it is described as rare rather than as unique.

MacroFactor is a coaching product with an adaptive engine inside it. SmartCrunch is an adaptive engine with nothing else attached. Theirs costs money to use at all. Ours is free for everything the engine does, and charges only for a photo-to-estimate convenience that changes no computed number.

If you want weekly check-ins, macro programmes, a verified food database and a product that will actively coach you, MacroFactor is the better answer and it is worth its price. If you want the number and nothing else, on an iPhone, without an account or a subscription, keep reading.

What each one is#

MacroFactor, by Stronger By Science Technologies, describes itself as combining “coaching algorithms with proven nutrition and behavioral science”. Its own App Store text says the app “uses a dynamic algorithm to adapt to changes in your metabolism”, built on a “unique energy expenditure calculation”, with weekly check-ins that adjust your targets. It also carries a verified food database, barcode scanning, micronutrient breakdowns, habit and period tracking, and integrations. It opens with a seven-day trial of a premium, ad-free product — there is no free tier.

SmartCrunch is an iPhone calorie tracker built around one screen and one number. It solves maintenance backwards from your diary and your weight trend, publishes every threshold and constant it uses, and refuses to answer when the data cannot support an answer. There is no account and no server holding your diary.

The mechanism, side by side#

Both apps do the same arithmetic in principle: what you ate, against where your weight actually went. Neither of us invented it; it is energy balance.

Where the two differ is what surrounds it. MacroFactor turns the result into a coaching relationship — a weekly check-in, an adjusted programme, an explicit promise that the algorithm still works if you miss your targets. SmartCrunch turns the result into one number and gets out of the way.

There is also a difference in temperament worth naming, because it cuts against us as often as for us. SmartCrunch refuses more readily than it answers. It will not print a learned maintenance figure unless at least ten days carry a diary, at least 85% of the window is logged, the weigh-ins span a fortnight, and the answer lands inside a plausibility band — and when any of those fails it falls back and says which rung it fell to. Those thresholds are published in full. MacroFactor’s equivalents are not published, so this page cannot compare them; what their text does say is that their algorithm keeps working when adherence is poor, which is a genuinely different design choice from ours rather than a worse one.

Where MacroFactor is straightforwardly better#

• It coaches. Weekly check-ins, programmes, adjustments explained to you. SmartCrunch does none of that and is not going to.
• Its food database is verified. Ours is Open Food Facts — open, public, contributed by people, and correspondingly patchy. When a record is missing a field, our app tells you rather than filling the gap, but a gap is still a gap.
• Micronutrient depth. Their text advertises detailed breakdowns; we carry four figures — fibre, sugars, sodium, saturated fat.
• Habit and period tracking, integrations, Android. None of which we have.

Where SmartCrunch is different#

• The engine is free. The budget, the diary, the barcode scanner, the goal weight, the trend, Apple Health both ways, your entire history: no daily caps, no history window. The paid tier is one thing — estimating a meal from a photo or a sentence — and it changes no computed number.
• No account. No sign-up, no login, no server holding your diary. It lives on your iPhone. (One honest exception: if you use the paid photo estimate, that photo goes to our worker to be estimated.)
• The thresholds are published. Every constant on the method page is the one the app runs on, including the awkward ones and the one we raised after it hurt somebody.
• One screen. No tab bar; logging, goals, weight and settings open as sheets over a single canvas.

Price#

Measured on the US App Store on 7 September 2026. Apple’s in-app purchase list mixes current and legacy items, so what follows is the range it showed rather than a quoted price list — check the App Store for what you would actually be charged today.

Both open with a seven-day free trial. The difference is what happens when it ends: with MacroFactor the app stops, and with SmartCrunch you keep the budget, the diary, the scanner, the trend and the history, and lose only the estimator.

Which to choose#

Choose MacroFactor if you want the adaptive target and the coaching around it — programmes, check-ins, a verified database, deeper micronutrients — and you are happy to pay for the whole thing. It is a more complete product than ours and this page is not going to pretend otherwise.

Choose SmartCrunch if you want the same underlying idea for nothing, on one screen, with no account, and you would rather an app told you it does not have enough data than gave you a confident number it cannot support.

Claims about MacroFactor were checked against its public pages on 2026-09-07 and are not warranted to stay current — prices and features change without notice, and the vendor's own site is authoritative. SmartCrunch is not affiliated with, endorsed by or sponsored by MacroFactor; the name is used only to identify the product discussed. Corrections: support@smartcrunch.org.