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I was looking for "low cognitive load" calculators, meaning that the user does not need even to look for the "=" or "*" signs when asking for a multiplication.

It was not easy to find one, so I vibe coded a set of layouts to check out. At the end it seems one needs a circular layout to swipe multi-digit numbers. Not a surprise that Gboard does not support swipe for numbers. I found it was a problem for large numbers because people accidentally raises the finger when looking for the next digits, so the most detailed versions allow "swipe continuation":

- if one starts from the numerical keys, it is a new number

- if the finger starts from outside the keyring, it is a continuation

Beyond swipe and double keyboards, I have not found any other solution to determine when a number finishes. Pauses are not informative enough.

The vibe coding experience with layouts was, well, interesting. I gave feedback via screen captures but I am not sure the model even used them.