A daily fair-play detective game: one mystery opens worldwide at midnight. Examine evidence, interview suspects, file your verdict, and share results spoiler-free.
Helpful apps,
bursting with practical solutions.
An independent studio crafting small, private apps for iPhone, iPad, Mac, and Android: games, collectors' catalogs, and everyday tools. No ads. No tracking. Built to work offline.
18 apps · 13 on the App Store · 15 on Google Play
A few of our favorites
Inquest
One case. One day. Solve it.
Washi Stash Tape Tracker
Never buy a duplicate roll
Periodic Table: Elements Lab
Chemistry study, beautifully illustrated
Nine Steep Tea Brew Timer
Gongfu tea timer & journal
Swaydar
Name the keystone lever
Postcard Archive
Private catalog for postcard collectors
Plumes
Bird feather ID & field guide
PartyPilot
Turn party notes into a host plan
Cari Art Design
Caricatures drawn just for you
Games & daily puzzles
A fresh challenge every day, fair, calm, and unhurried.
Rotate three concentric rings so every spoke adds up to the day's target. A calm, daily number puzzle for quick minds.
A cozy donut-decorating game for ages 4-6: add frosting, sprinkles, and candy, then show your creation to three funny judges. No ads, no tracking.
A daily persuasion-deduction puzzle: read one real-world pitch, spot the influence levers, and name the keystone that makes the whole thing collapse.
Collectors & catalogs
Quiet shelves for the things you love to keep track of.
An offline, private catalog for washi tape collectors. Track every roll's color, pattern, width, and shop, and get warned in Shopping Mode when you already own a similar one.
Record each card's front and back, place, era, condition, stamps, and postmarks. Search, stats, and a timeline, all on device.
Add plush as Owned, Wanted, or Trading, with photos, cuddle ratings, and purchase logs. Watch your completion grow, stored privately on device.
A calibrated, offline feather atlas built on the USFWS Feather Atlas. Identify a found feather, compare it at centimeter scale, and learn the legal context.
A private, offline ferment tracker with day clocks, feeding reminders, a photo log, and a built-in guide for your starters, brews, and batches.
Everyday tools
Small, sharp utilities that do one thing and respect your time.
Get reminded 60, 30, 7, and 1 day before a warranty lapses, so you book the repair while it's still covered. Manuals, receipts, and a one-tap Service Packet, offline.
795,000+ NGS survey marks bundled fully offline. Map them, read the full datasheet, and log every recovery, no account, no signal needed in the field.
A private, on-device helper for real jigsaw puzzles. Sort your pile into color buckets, pull out edges and corners, and get honest area hints.
A planning workspace that turns rough notes into a structured host plan: guest counts, quantities, shopping groups, budget, timeline, and invite copy.
A multi-infusion gongfu brewing companion: nine grounded presets, an auto-advancing steep timer, and per-infusion tasting notes for serious loose-leaf drinkers.
Learn & create
Study, reference, and make, beautifully and privately.
All 118 elements with original illustrations and sourced data, paired with an FSRS spaced-repetition system that schedules each card for the moment you're about to forget it.
A hands-free, on-device flashcard app. Turn notes into audio cards and get quizzed out loud through your earbuds while your hands and eyes are busy.
A private, room-by-room companion offering practical, budget-aware swaps with honest evidence levels. Fully offline, no accounts, no tracking.

Snap a selfie and watch a friendly character artist draw your caricature live, sketch to color, processed privately on device, with no uploads.
Software that minds its own business.
Every Rizk Corsight app follows the same promises, the reason they feel secure to use.















