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https://github.com/60milesperhour/horizon

Multi-provider AI chat client (Ollama, Claude, OpenAI, Gemini). Per-conversation configs, secure on-device key storage, primary+backup Ollama URL with failover. Flutter, GPL-3.0 fork of Reins.
https://github.com/60milesperhour/horizon

ai-chat android anthropic chat-application chatbot claude dart flutter gemini gpt-4 llm llm-client local-llm macos ollama openai self-hosted windows

Last synced: 27 days ago
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Multi-provider AI chat client (Ollama, Claude, OpenAI, Gemini). Per-conversation configs, secure on-device key storage, primary+backup Ollama URL with failover. Flutter, GPL-3.0 fork of Reins.

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README 

          



Horizon logo



# Horizon



**A multi-provider AI chat client built on Flutter.**

Talk to **Ollama**, **Claude**, **OpenAI**, and **Gemini** from a single app — with per-conversation configs, secure on-device key storage, and an OLED-optimized dark theme.



[**Download latest release ▸**](https://github.com/60MilesPerHour/Horizon/releases)






---



## Highlights



- **Four providers, one app.** Ollama (local + Ollama Cloud), Claude (Anthropic), OpenAI (incl. o-series reasoning), Gemini (Google). Mix providers freely across chats — or even mid-chat.

- **Per-conversation everything.** Model, provider, system prompt, temperature, context size, max tokens — all stored per chat. No global toggles to babysit.

- **Live model + provider switching.** Switch from a local Llama to Claude Sonnet mid-thread without losing history.

- **Self-hosted-friendly Ollama setup.** Configure a *primary* and a *backup* server URL. Requests fail over automatically when the primary is unreachable — keep your home-LAN address private and let traffic transparently route through your VPN/Tailscale endpoint when you're off-network.

- **Ollama Cloud + bearer auth.** Optional Authorization token for Ollama Cloud (ollama.com) or any reverse-proxy that gates a self-hosted Ollama behind auth.

- **Per-chat thinking toggle.** Three-state `think` control (Default / On / Off) for Ollama models with a thinking phase (Qwen 3, gpt-oss, etc.). Models without one ignore it.

- **Secure key storage.** Cloud-provider API keys live in the OS keystore via `flutter_secure_storage` — never in plaintext settings or app data.

- **Smooth streaming.** Typewriter buffer plus plain-text rendering during the stream means responses don't turn into a slideshow as they grow. Markdown renders cleanly once the response completes (code blocks, GFM tables, the works).

- **OLED true-black dark theme.** Free AMOLED battery, pleasant at night.

- **Image input** on every vision-capable model — Ollama vision, Claude, GPT-4o, Gemini.

- **Edit & regenerate.** Edit any of your past messages and regenerate the assistant's response from there.

- **Custom Ollama models.** Save your favourite prompt + config combo as a fresh Ollama model — Horizon calls `/api/create` for you.

- **Responsive layout.** Same Flutter codebase tuned for phone, tablet, and desktop.



## Install



| Platform | Download | Notes |

|---|---|---|

| **Android** | `horizon-vX.Y.Z.apk` from [Releases](https://github.com/60MilesPerHour/Horizon/releases) | Signed. Sideload via Files/adb. |

| **macOS** | `horizon-macos.zip` from [Releases](https://github.com/60MilesPerHour/Horizon/releases) | Unsigned. After unzip: `xattr -dr com.apple.quarantine /Applications/horizon.app` |

| **Windows** | `horizon-windows.zip` from [Releases](https://github.com/60MilesPerHour/Horizon/releases) | Extract and run `horizon.exe`. VC++ runtime DLLs are bundled. |

| **Debian / Ubuntu / Mint / Pop** | `horizon_X.Y.Z_amd64.deb` from [Releases](https://github.com/60MilesPerHour/Horizon/releases) | `sudo apt install ./horizon_X.Y.Z_amd64.deb` |

| **Other Linux** | `horizon-X.Y.Z-linux-x64.tar.gz` from [Releases](https://github.com/60MilesPerHour/Horizon/releases) | Extract and run `./horizon` |

| **iOS** | Not currently distributed | Buildable from source if you have an Apple Developer account. |



## Configure



1. **Ollama** — Settings → Server → enter `http://:11434`. Optionally enter a backup URL (Tailscale, VPN, etc.) — used automatically when the primary can't be reached. For **Ollama Cloud**, set the primary to `https://ollama.com` and paste your `olc-...` token in the API Token field below.

2. **Cloud providers** — Settings → Cloud Providers → paste API keys for Anthropic, OpenAI, and/or Google. Models from every configured provider show up in the model picker, grouped by provider.

3. **Per-chat thinking** (Ollama) — Configure Chat → Thinking → Default / On / Off. Leave at Default unless you need to force a thinking-capable model on or off.



That's it.



## Compared to upstream Reins



Horizon is a fork of [Reins](https://github.com/ibrahimcetin/reins) — a clean Flutter Ollama client by [Ibrahim Çetin](https://github.com/ibrahimcetin). Upstream's last public release was 1.2.0 and the repo has been quiet since; this fork started as a personal stability patch and grew into a multi-provider client. Major changes:



| Area | Reins (1.2.0) | Horizon (3.3.0) |

|---|---|---|

| Backends | Ollama only | Ollama (local + Cloud) + Claude + OpenAI + Gemini |

| Server reachability | Single URL | Primary + backup URL with automatic failover |

| Authenticated Ollama | n/a | Optional bearer token for Ollama Cloud / proxied servers |

| Per-chat `think` toggle | n/a | Three-state Default/On/Off |

| Network reliability | A few hang/leak edges | 30 s timeouts everywhere, stream-subscription cleanup, JSON parse guards, tagged provider errors |

| Streaming feel | Per-token rebuilds (jittery on bursty SSE) | Typewriter buffer + plain-text live render → Markdown on completion |

| `num_ctx` behaviour | Always sent, always 2048 default → forced Ollama to reload models | Defaults to "let the server decide"; opt-in override per chat |

| Multi-provider routing | n/a | `ChatService` abstraction, per-chat `provider` column, self-healing on read |

| Key storage | n/a | OS keystore via `flutter_secure_storage` |

| Theme | Material default | OLED true-black dark + dynamic colour |

| Platform builds | Manual | GitHub Actions: Android (signed APK), macOS, Windows, Linux (.deb + tar.gz) on every push |

| Distribution | APK only (1.2.0) | Android APK + macOS app + Windows exe + Linux .deb / tar.gz per release |



Anything that was good in Reins — the responsive layout, the chat-configure sheet, the model-selection bottom sheet, the inline Markdown rendering — is still good in Horizon. The diff is purely additive.



## Build from source



Local Flutter dev works for Android/macOS/Linux. iOS and Windows generally route through CI.



```bash

git clone https://github.com/60MilesPerHour/Horizon.git

cd Horizon

flutter pub get

flutter run                  # uses current device

flutter build apk --release  # Android

flutter build macos --release

flutter build windows --release

```



Dart SDK ≥ 3.5.4 required. Flutter 3.27.x recommended (this is what CI pins).



## Contributing



Issues and PRs welcome. Quick rules of the road:

- Keep changes per-platform-buildable. CI builds Android + macOS + Windows on every push to `main` and on PRs.

- Don't break per-chat isolation — anything that touches the request path should respect `chat.provider`.

- New providers go in `lib/Services/_service.dart` and register through `ChatServiceRegistry`.



## Credit



Built on top of [Reins](https://github.com/ibrahimcetin/reins) by [Ibrahim Çetin](https://github.com/ibrahimcetin). Thank you for shipping a clean, hackable Flutter Ollama base — every multi-provider, networking, and polish change in Horizon stands on top of your work.



## License



[GPL-3.0](LICENSE), inherited from Reins. Modifications and additions © Miles Oldenburger 2026.