Why we ask you to confirm every scan

The fastest possible food tracker would photograph your plate and write it straight to your history. No list, no checkboxes, no tap. Several apps work exactly that way, and on paper it is the better product: fewer steps, less friction, more meals logged.

Senumi puts a confirmation screen in the middle instead. That is a deliberate cost, so it is worth saying why we pay it.

What the extra tap buys

It keeps the error correctable. Food recognition is good at naming things and weak at quantifying them. That is not a temporary limitation: a photograph is a flat projection, and depth is inferred rather than measured. So there will be items that come back too large, too small, or occasionally wrong. If those go straight into your history, they are now indistinguishable from the ones that were right. If you see them first, one of them takes two seconds to fix.

It stops the log drifting away from the truth. A tracker is only useful as a record of what actually happened. The moment it becomes a record of what a model thought happened, every conclusion you draw from it is one step removed from your actual eating. The confirmation screen is what keeps those two things attached.

It makes the uncertainty visible. On the confirmation list you can see that the app has guessed "about 1 cup" rather than measured it. That framing carries into how you read the weekly chart, and it should: these are estimates, and an interface that hides the estimating encourages a confidence the numbers do not support.

What it costs

Honesty about the trade: it is slower, and slower means some meals go unlogged. We think that is the right side to err on for a health app, but it is a real cost and not a free win.

We try to make the tap cheap rather than remove it:

• The list arrives pre-ticked, so confirming an accurate scan is one button.
• Untick, do not delete. Removing something the model saw but you did not eat is a checkbox, not a menu.
• A correction is what gets recorded. The list is a draft; your edits are the version that enters your history.

Where the same thinking shows up

Nothing is written to your history until you say so, and nothing is quietly upgraded either. The same rule applies to the parts of the app that reach a server: scanning a lab result or asking the health assistant is something you initiate, not something that happens in the background because you opened the app.

The short version

A number you have checked is worth more than a number you were handed, even when the handed one is usually right. The tap is the difference.