Look after a living glass tank a few minutes a day: real water care, flick-to-cast fishing in nine places, a greenhouse, corals and a field journal. Free, offline, no account.
Riak is a calm aquarium you look after a few minutes a day.
It runs in any browser, installs as an app and keeps working offline.
Fish waste becomes ammonia, then nitrite, then nitrate. Test kits, water changes and filters keep the cycle healthy.
Flick up on the water to cast, flick again to strike, then crank the reel while you watch line tension against the fish's strength. Set the drag, or use phone motion to cast.
Pond, rice paddy, stream, mangrove, blackwater, lagoon, glacier lake, open ocean and harbour, each drawn with its own scenery, weather and time of day. Every one of the 47 species has its own drawn body and fins.
Five baits and five lures, tournaments against CPU anglers, 12 fishing quests and a catch album with trophy cards.
16 aquatic plants, 8 hardscape pieces, 3 substrates and 3 tank sizes. Happy adult pairs have fry, and colours mix from both parents.
Sow from the seed shelf, water trays and harvest cuttings or houseplants, with rare variegated sports. Frag and cross corals into named strains.
A short care list each day with a streak, plus daily fish, cutting and houseplant orders that pay shells.
A numbered field guide with Latin names for every species you find, true-shape silhouettes and hints for the rest, plus plants, coral strains and 18 milestones.
Open the app, pick a language and name your first tank.
Feed the starter fish and run a water test to see the cycle.
Fish the lily pond: flick up on the water to cast, strike when the float dips, then crank the catch in.
Pick something from the seed shelf in the greenhouse and come back when it is ready to harvest.
From the README’s “Run it locally” section. Full options, requirements and troubleshooting are there too.
Open the README$ python -m http.server 8000130 files in the repo · last updated 8 Nov 2026.
Browse the codeV1.2.1: hone pass - readable toggles, garden bench, field-guide journal
Flick fishing: cast by swipe, crank reel, tension vs fish strength, tackle, tournaments, quests, album, challenge links
Cozy aquarium PWA (tank care, fishing, greenhouse, reef lab, journal, focus)
Web app, PWA. You can try it in the browser with nothing to install.
The commands in the “Run it locally” box above come straight from the README. Paste them into a terminal; the README covers options and troubleshooting.
Everything stays in your browser (localStorage).
Not yet: it's marked “live” and still changing. The README always has the current state.
The source is public on GitHub under the MIT licence.
Juwen Lie, an R&D mechanical engineer in Batam, Indonesia, as an independent personal project.
A cozy aquarium that lives in your browser
