A finished app, not a starter
Companion apps are one of the highest-earning app categories right now, but building one properly means wiring an LLM safely, keeping your keys off the phone, writing moderation, designing a paywall, and passing Google's AI-content review. Commissioning that from a studio runs well into the thousands and takes weeks.
Muse is that app, done. Six companions with real personalities, a secure backend proxy, on-device memory, voice replies, a subscription screen, and the compliance paperwork — ready to rebrand and publish.
Meet the six companions
Each ships with her own personality, system prompt, voice, boundaries and art. Swap them, restyle them, or add your own in one file.
What is inside
Six companions, done
Aria, Maya, Luna, Selin, Nora, Sonia — each with a distinct personality, system prompt, voice, boundaries, and art. Add more in a single file.
Secure backend proxy
A zero-dependency Node server keeps your LLM and voice keys off the phone, with rate limiting, input and output moderation, and CORS. Anthropic Claude wired in; swap for any provider.
Memory & relationship
Every companion remembers facts and grows a bond level as the user chats, stored on-device. It feels continuous, not stateless.
Voice both ways
Speech-to-text so users talk to their companion, and PRO text-to-speech so the companion speaks its reply out loud.
Subscription paywall
Free daily message and voice limits, a clean PRO screen wired for Google Play Billing, and a documented demo unlock for development.
Store-ready paperwork
Play Store listing draft, privacy policy, release checklist, and a full architecture spec — the compliance work that usually stalls a launch is written.
How you make money
The monetization is already built — you choose the model:
Subscriptions
The built-in PRO paywall ($4.99/mo out of the box) is the standard companion-app model. Wire Google Play Billing and you are charging.
One-time unlock
Prefer no subscriptions? Flip PRO to a single in-app purchase in one file.
Ads for free users
Keep chat free and monetize with a rewarded or banner ad between sessions. The free tier is already gated by daily limits.
The stack
React Native + Expo on the front, a dependency-free Node proxy on the back. Clean, readable, and organized so you can find anything fast.
App.js navigation + first-launch routing
src/screens/ Onboarding, Home, Profile, Chat, Premium, Settings
src/data/characters.js the six companions - add your own here
src/services/ api, tts, transcribe, storage, subscription, safety
src/theme.js one palette drives the whole app
# backend
backend/server.js LLM + TTS + STT proxy - no dependencies
# docs
docs/ Play Store listing, privacy policy, release checklist
PRODUCT_SPEC.md full product + architecture plan
Muse is app source code you rebrand and publish yourself. You supply your own LLM API key, backend hosting, Google Play developer account, and Play Billing setup before going live; the included checklist walks through each. Character art is AI-generated and royalty-free to use in your app. This is a template product, not an app store listing or a guarantee of store approval or earnings.
Questions
What exactly do I receive?
A ZIP with the complete React Native (Expo) app and its Node backend — every screen, service, the six companions, all art and icons, and the docs folder. No obfuscation, no locked modules, no license server. You can read, rebrand, and extend every line.
Do I need to be an expert to launch it?
You need to be comfortable running a few terminal commands. `npm install`, start the backend, run `npm start`, and it opens in Expo Go on your phone within minutes. The README walks it step by step, and the app runs in a demo reply mode even before you add any API key, so you can click through the whole thing first.
What do I have to supply?
An LLM API key on the backend (a free Anthropic key takes two minutes) and, when you are ready to publish, a hosting box for the backend and a Google Play developer account. Voice is optional — leave the ElevenLabs key blank and the app stays text-only.
Can I really put this on the Play Store?
Yes — that is what it is built for. The included release checklist and privacy policy cover Google Play's AI-content and subscription rules. You still do the standard launch work: production hosting, real Google Play Billing with receipt validation, your own art and branding, and answering the content rating honestly.
Is the content safe for store review?
The app is deliberately tasteful, non-explicit companionship with clear AI disclosure. Moderation runs on both the input and the output, on the app and the backend, and blocks explicit, illegal, hateful, and self-harm content. That is the posture Google's policy expects.
Can I change the characters and design?
Completely. Personalities live in one data file, the whole palette in one theme file, and the art is plain PNGs you can swap. Rename the app and package in `app.json` and it is yours.
How is it licensed?
Build and publish as many of your own apps as you want, commercial or personal. You may not resell or redistribute the source itself. One purchase = one developer or company.