Kipinä is Finnish for spark

Small iPhone apps that show their work.

Each app does one job properly, keeps your data on your iPhone, and shows you exactly where its answers come from.

Hunch

Sleep & recovery experiments

Your score tells you how you are. Hunch finds out what changes it.

Test one change for 14 nights, like no caffeine after noon
See whether your sleep or recovery really moved, or it was just a normal week
Reads Apple Health and works everything out on your iPhone

Coming soon to the App StoreSee Hunch

Hunch's Today screen with recovery, training load, stress and steps rings

Sourced 107

Part 107 exam & chart practice

Study for the FAA drone pilot test with answers you can check.

Every answer cites the FAA rule it comes from, word for word
Practice the chart questions added to the test in October 2026
Full 60-question mock exams with the two-hour timer

Coming soon to the App StoreSee Sourced 107

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Under Part 107, what is a small unmanned aircraft?

AOne weighing less than 55 pounds on takeoff, including everything on board

BOne weighing less than 55 pounds without its payload

COne weighing no more than 25 pounds on takeoff

CorrectThe 55-pound limit is the total takeoff weight, including anything carried or attached, not the airframe alone.

Source: 14 CFR 107.3Small unmanned aircraft means an unmanned aircraft weighing less than 55 pounds on takeoff, including everything that is on board or otherwise attached to the aircraft.

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How we make apps

The same three rules for every app.

Private by default

No accounts, no ads, no tracking. What you put into an app stays on your iPhone.

Shows its work

Hunch shows you the two weeks it compared. Sourced 107 quotes the rule behind every answer.

One job each

Small, focused apps that do one thing properly, with prices stated up front.