What we do
We make small, self-contained apps and we run them ourselves. That means the design, the engineering, the backend, the art, the audio and the writing are all done in-house — we do not license someone else’s product and present it as a portfolio, and we do not subcontract delivery.
We ship every product to iOS, Android and the web from one codebase, so the platforms stay in step rather than diverging by years. We operate our own servers and our own release process.
Our products
Nhom is a social app for local and online events, available in English and Tiếng Việt. Mines of Idle Doomath is a free idle game about arithmetic. Both are live and both are linked from the products page.
How we make decisions
Core stays free
No paywall on core progression in any product. Purchases are cosmetic or convenience only.
No dark patterns
No fake offers, no countdown timers, no forced or interrupting ads. Rewarded video only runs when the player starts one.
Privacy by default
Products are usable without an account, keep data on your device unless you opt in, and publish a one-step deletion path.
Original work
Art, audio and writing are made for us and owned by the studio. No stock asset packs carrying someone else’s licence.
Real support
A named person reads every message, on an address at our own domain, with published support hours.
Built for real communities
Products ship in the languages the people who use them actually speak.
Independence
−4 Kelvin LLC is self-funded and independent. We are not affiliated with, endorsed by, or sponsored by Apple Inc., Google LLC, Unity, or any advertising network. Where a product uses a third-party service — an app store, a payment processor, an ad network — it is disclosed in that product’s privacy policy.
Contact
Legal entity details, D‑U‑N‑S number and support addresses are published on the contact & legal information page.