Our work

Products

Everything −4 Kelvin LLC builds and operates. Each product is a separate live service with its own site, its own legal documents and its own support route.

Nhom Nhom

Find your people. Do the thing.

Nhom is a social app for local and online events. Browsing a lobby takes one tap, and each one carries its own social layer so plans actually happen rather than dying in a comment thread.

What makes it different

  • Social preferences. Lobbies declare who they suit — energy, purpose, age range — so you filter for your people rather than scrolling a feed.
  • More than a meetup. Every lobby has group chat, a feed, and recurring groups, so the group outlives the event.
  • Local and online. One lobby for your street or your server; join in person or from anywhere.
  • Compete for real. Ranked lobbies, matches and leaderboards turn a casual meetup into something worth showing up for.

Categories

Sports & outdoors · Food & drink · Gaming & screens · Night out & social · Dates & meetups (18+)

Availability

Web now, in English and Tiếng Việt. Add to the home screen from the browser menu; Android and iOS apps are in development.

Social & communityEvents English & Tiếng ViệtWeb · Android & iOS coming
The Nhom home screen, showing the tagline, signup and quick starts

Mines of Idle Doomath

Keep the crew mining. Just answer the maths.

A single-player idle game about a small crew working a very deep shaft. The core action is deliberately simple: you are shown a short equation, you type the answer, and every correct answer earns minerals. Between answers the game keeps earning on its own, which is what makes it an idle game.

Systems

  • Equations and combos. Addition, subtraction, multiplication and division, scaled to your progress. Consecutive correct answers build a combo multiplier; a mistake resets the combo only, never your minerals.
  • Upgrades and miners. Click power raises the base payout; miner tiers hire crew who dig automatically and appear in the crew column beside the shaft.
  • Gems, a second track. Gems come from achievements, the daily question and the weekly contract, and buy a separate set of upgrades — automation, combo protection and cosmetics.
  • Prestige: sink a new shaft. Reset a stalled run for a permanent multiplier. Cosmetics, achievements and gem upgrades are kept.
  • A named, dressable crew. Every miner is an individual character who can wear any outfit and pickaxe you have unlocked.

Free to play, stated plainly

No paywall anywhere in the progression. No banner, interstitial or forced ads — rewarded videos only, and only when you tap to start one. Purchases are cosmetic packs (pickaxes, outfits, cave themes) and a convenience pack; they change how the game looks, not how it progresses, and never outpace a free player.

Availability

Free in the browser and on Android. Fully playable with no account; your progress is stored locally, and a free account adds cloud backup, a text save code, and an optional leaderboard under a name you choose.

Idle / clickerSingle player Offline playableiOS · Android · Web
Mines of Idle Doomath gameplay

How the two are built

Both products ship to iOS, Android and the web from a single React Native codebase, so platforms feature-parity instead of arriving years apart. Art, audio, design and writing are original to −4 Kelvin LLC.