Overview
Built on the concept "Keep it fun, keep it moving forward," this iOS app visualizes your pace toward reaching a goal. By making it clear how much "you just need to do today," it offers a structure that lets you keep going without strain. It was released on the App Store on February 25, 2026.
For ongoing goals tracked by count—reading, studying, exercise, habit-building, work—it simultaneously visualizes your "remaining count," "remaining days," and "current pace." After release, it reached No. 1 in the paid Productivity category ranking on the App Store (as of February 26, 2026).
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Background of Development
"This year I'll read 50 books." "I'll run three times a week." Setting a goal itself isn't hard. But before you know it, you've forgotten about it. That experience is where PACE began.
A simple goal—how many times to do something, by when—somehow slips away amid daily work and life. We wanted to reduce that even a little. We finally realized that idea, which had been on our minds all along, in the form of an app.
This development was also an experimental project for ZUKAI. The attempt was to complete everything—design, UI, and implementation—solely through dialogue with generative AI. We proceeded without looking at any code, working only through exchanges in Japanese: implemented in one week from concept, released in ten days. The thinking that ZUKAI has cultivated—structuring information to make it visible—came to fruition as a product through the tool of AI.
Recommended Points
◾️Just look at the color to know how much to do today
Progress is shown in color across five levels: "fast / somewhat fast / on track / somewhat slow / slow." Without checking the numbers in detail, you can grasp your pace at a glance and set today's target.
◾️Your pace is automatically recalculated even on days you skip
Because the remaining pace updates each time you log, you can restart without panic even if you have an off day. It's a design that prioritizes continuing over aiming for perfection.
◾️Carries nothing unnecessary
No ads, one-time purchase, no login required, and data stored only on your device. We're thorough about a simple environment where you face only your goal each time you use it.
App Information
App name: PACE
Supported OS: iOS
Release date: February 25, 2026
Languages: Japanese / English
Developer: Tetsuro Kondoh