HostMost — Event & group finance app · iOS & Android

Media & Content · Est. $18k – $20k

HostMost

Event & group finance app · iOS & Android

Coralsoft designed, built and shipped this product for the client.

MobileWebBackendReact Native 0.81Expo SDK 54Expo Router 6

HostMost event detail screen: a weekend trip with status, location and shared media

HostMost finances tab: expense ledger, shared totals, fee rules and balances

The situation

What was in place before we started.

Group events — game nights, poker evenings, shared trips, team outings — involve three recurring headaches: coordinating who is coming, splitting costs fairly, and chasing people for money afterwards. Most groups solve this with a combination of WhatsApp threads, spreadsheets, and Revolut requests. It works until it does not.

HostMost was built to collapse that stack into a single mobile app. The product vision was straightforward: one place from invitation to final payment. The engineering challenge was anything but — this is a social product, a finance product, and a real-time collaboration product simultaneously, with a niche vertical feature (a full poker chip ledger) layered on top.

Constraint

The engagement was greenfield: no existing codebase, no inherited decisions. Coralsoft designed and built the entire product — mobile client, Supabase backend, serverless automation, and production release pipelines for both app stores — from day one to v1.1.31 in production.

Estimated Timeline: 8 months
Estimated Team: 6 people
Estimated Budget: $18k – $20k
Platforms: 3

Stack

React Native 0.81Expo SDK 54Expo Router 6TanStack Query v5NativeWind 4 + Gluestack UIReact Hook Form + ZodExpo Push (APNs + FCM)Supabase PostgreSQL + RLSSupabase RealtimeSupabase Edge Functions (Deno)pg_cronTypeScript 5.9MailjetEAS Build + OTA Updates

Delivery story

HostMost: making content discovery and creation feel effortless

Challenge

A greenfield cross-platform mobile app that brings event planning, shared expenses, debt settlement, and group chat into one place — designed, built, and shipped to the App Store and Google Play by Coralsoft. The main delivery challenge was to give users dense content and media tools that still feel immediate on everyday devices, while keeping Events, Connections, and Venues consistent across the complete journey. We framed the engagement around the smallest production-worthy flow first, then expanded the scope without weakening the underlying component and data model.

How we built it

We started with the navigation model, reusable screen primitives, and the data contracts behind the most important user journey. From there we delivered Events, Connections, and Venues in vertical slices, so every milestone included a usable interface, live data, validation, and error handling. Realtime updates and offline recovery were designed together because mobile connectivity could not be assumed. The application foundation centred on React Native 0.81, Expo SDK 54, Expo Router 6, and TanStack Query v5, followed by device testing and release hardening for iOS and Android.

Delivery

The delivered scope brought Events, Connections, Venues, and Finances into one coherent cross-platform mobile release. Live updates, recovery states, and operational feedback are part of the core flow rather than late-stage patches. For HostMost, the practical result is a product that communicates its value quickly while giving the team a maintainable base for continued delivery in media & content.

Challenges

Each constraint, and what we did about it.

Constraint

What we did

The mobile client follows a feature-based modular structure under Expo Router — file-based routes in app/, business logic per domain in features/, shared primitives in components/. TanStack React Query manages all server state; Supabase Realtime subscriptions feed live finance and chat updates directly into the query cache without polling. The React Native New Architecture is enabled in production.

Results

Measured outcomes.

70+

Incremental PostgreSQL migrations through v1.1.31

34+

App routes shipped across six feature domains

Feature domains — events, finance, chips, messaging, venues, social graph

Roadmap

Estimated delivery sequence.

8 months

Weeks 1–5

Discovery & architecture

Create, edit, role assignment, status workflow, activity feed, media gallery, polls and reminders.

Events

Weeks 6–17

Core build

Social graph with search, email-based invite funnel, blocking and reporting.

Connections

Weeks 18–24

Integrations & data

House listings, availability windows, access control, image galleries and event linking — letting frequent hosts build a reusable library of locations.

Venues

Weeks 25–31

Hardening & QA

Expenses, splits, balances, settlements, fee rules, freeze controls and cross-event debt — built on a proper ledger, not UI-level arithmetic.

Finances

Weeks 32–35

Launch & handover

Buy-ins, cash-outs, requests, approvals, void/correction and materialised balances — a first-class backend concept, not a hack layered on top of expenses.

Poker chips

Est. $12k – $15k

Curio

AI Antique Identification

mobileMedia & Content

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