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.
27 apps · 24 on the App Store · 24 on Google Play
An App Store unlock follows you across supported iPhone, iPad, and Mac versions. A Google Play unlock follows you across supported Android devices and compatible Chromebooks. Sign in with the same store account; Apple and Google purchases are separate.
Start with what you want to do, then compare platforms and store availability.
One case. One day. Solve it.
Never buy a duplicate roll
Chemistry study, beautifully illustrated
Gongfu tea timer & journal
Name the keystone lever
Private catalog for postcard collectors
Bird feather ID & field guide
Turn party notes into a host plan
Caricatures drawn just for you
Learn plants, not just names
Three candidates arrive without their names. You pick one — then the match comes back with the clues behind it. 1,871 plant species, matched on your device.
Butterflies and moths, offline
Notice the wings, body and markings before the name appears. 1,500 species of butterflies and moths, matched on your device.
Offline bug ID & field guide
Name the insect in front of you: 9,500+ species, entirely offline and private. Learn with Notice, Guess, Reveal. One-time purchase after a 3-day trial.
Meet your next field guide · Offline fish ID
Identify fish from a photo, even offline. Private on-device results, no subscription required, and clear traits that help you learn each species.
A fresh challenge every day, fair, calm, and unhurried.
One case. One day. Solve it.
One case. One day. Solve it.
A daily fair-play detective game: one mystery opens worldwide at midnight. Examine evidence, interview suspects, file your verdict, and share results spoiler-free.
730 · Available now
730 · Available now
Solve a shared daily case, then explore 730 mysteries at landmarks worldwide.
Daily arithmetic logic puzzle
Daily arithmetic logic puzzle
Rotate three concentric rings so every spoke adds up to the day's target. A calm, daily number puzzle for quick minds.
Ad-free kids baking game
Ad-free kids baking game
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.
Name the keystone lever
Name the keystone lever
A daily persuasion-deduction puzzle: read one real-world pitch, spot the influence levers, and name the keystone that makes the whole thing collapse.
Quiet shelves for the things you love to keep track of.
Never buy a duplicate roll
Never buy a duplicate roll
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.
Private catalog for postcard collectors
Private catalog for postcard collectors
Record each card's front and back, place, era, condition, stamps, and postmarks. Search, stats, and a timeline, all on device.
Private, offline plush collection tracker
Private, offline plush collection tracker
Add plush as Owned, Wanted, or Trading, with photos, cuddle ratings, and purchase logs. Watch your completion grow, stored privately on device.
Bird feather ID & field guide
Bird feather ID & field guide
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.
Sourdough, kombucha, kimchi & yogurt
Sourdough, kombucha, kimchi & yogurt
A private, offline ferment tracker with day clocks, feeding reminders, a photo log, and a built-in guide for your starters, brews, and batches.
Small, sharp utilities that do one thing and respect your time.
Warranty reminders, manuals, receipts & repair records — private, offline vault.
Warranty reminders, manuals, receipts & repair records — private, offline vault.
Never miss a covered repair window again. ManualNest reminds you — 60, 30, 7, and 1 day before a warranty expires — so you book the repair while it's still covered, not the week after.
Find & log NGS survey marks
Find & log NGS survey marks
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.
Jigsaw sorting helper
Jigsaw sorting helper
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.
Turn party notes into a host plan
Turn party notes into a host plan
A planning workspace that turns rough notes into a structured host plan: guest counts, quantities, shopping groups, budget, timeline, and invite copy.
Gongfu tea timer & journal
Gongfu tea timer & journal
A multi-infusion gongfu brewing companion: nine grounded presets, an auto-advancing steep timer, and per-infusion tasting notes for serious loose-leaf drinkers.
Study, reference, and make, beautifully and privately.
Chemistry study, beautifully illustrated
Chemistry study, beautifully illustrated
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.
Read old records & wills
Read old records & wills
Train your eye to read historic handwriting with guided letterforms, real manuscript practice, and private on-device study tools.
Daily paper-folding puzzle
Daily paper-folding puzzle
Fold a sheet along the clues, predict the punched pattern, and sharpen spatial reasoning in a calm daily puzzle.
Study with your ears
Study with your ears
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 calm guide to a cleaner home
A calm guide to a cleaner home
A private, room-by-room companion offering practical, budget-aware swaps with honest evidence levels. Fully offline, no accounts, no tracking.
Caricatures drawn just for you
Caricatures drawn just for you
Snap a selfie and watch a friendly character artist draw your caricature live, sketch to color, processed privately on device, with no uploads.
Know your sky, tides & seasons
Know your sky, tides & seasons
Tides, sky, weather, birds & blooms for your region — one calm page, on-device.
Plan the low tide. Meet life.
Plan the low tide. Meet life.
Low-tide windows for 33 US & Canada coasts, plus 73 species cards. No tracking.
Your data stays on your device. No accounts, no tracking.
Core features work without a connection whenever practical. Some apps use the internet for fresh data or updates.
Calm screens. We never sell your attention.
Pricing varies by app and store. The listing shows any purchase or paid unlock before you buy; there are no ads.
An App Store unlock follows you across supported iPhone, iPad, and Mac versions. A Google Play unlock follows you across supported Android devices and compatible Chromebooks. Sign in with the same store account; Apple and Google purchases are separate.
No. Results are educational suggestions, not expert advice. Never use an app alone for medical, edible, venomous, legal, or safety decisions.
This website is available in 24 languages. App language support varies, so check the store listing for the app you choose.
Every Rizk Corsight app follows the same promises, the reason they feel secure to use.
