StackChan World vs Reachy's Brain
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
StackChan World
This app allows users to connect with a cute, AI-powered desktop robot. It provides access to the robot's features and enhances the user experience with its open-source hardware and software.
- AI-powered robot interaction
- Open-source hardware and software
- App-based pairing with robot
- Enhanced user fun and features
- Community co-created robot
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·_· StackChan is a super cute desktop robot co-created by M5Stack and the user community. It is powered by AI, and all the hardware and software is open-source. Download the app, pair with your StackChan, and get more fun!
Reachy's Brain
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Reachy transforms your iPhone into a powerful voice interface for the Reachy Mini robot. Combine on-device Apple Intelligence with OpenAI real-time voice technology to create natural, expressive conversations with your robot companion. VOICE FIRST Simply talk to Reachy like you would a friend. Advanced on-device speech recognition captures your words instantly, while Apple Intelligence processes responses locally for maximum privacy. DUAL AI MODES - On-device processing via Apple Intelligence - your conversations stay private - OpenAI real-time voice for natural, fluid conversations with personality - Custom assistants with unique voices and behaviors EXPRESSIVE ANIMATIONS Reachy does not just talk - it emotes. Choose from dozens of head animations including dances, expressions, and gestures that bring your robot to life. CREATE YOUR OWN APPS Build custom robot personalities without coding. Design unique assistants with their own voice, animations, and capabilities - then share them with the community. FULL CONTROL - Virtual joystick for precise head movement - Volume and motor control - Wake and sleep commands - WiFi network management VOICE LIBRARY Pick from multiple high-quality voices. Preview each one and find the perfect personality for your Reachy. REQUIREMENTS - Reachy Mini robot from Pollen Robotics - iPhone 15 Pro or newer (for Apple Intelligence) - iOS 17.0 or later (iOS 18.1 or later for Apple Intelligence features) - Same WiFi network as your robot - OpenAI API key (for voice features) GETTING STARTED 1. Install the iOS Bridge server on your Reachy Mini 2. Connect both devices to the same WiFi network 3. Follow the in-app onboarding to configure your connection 4. Start talking This app is developed independently and is not associated with Pollen Robotics or Hugging Face, the manufacturer of Reachy robots.
Screenshots
Verdict
StackChan World and Reachy's Brain are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
StackChan World ships an update every 6 days, Reachy's Brain every 2 weeks. The most recent releases landed on September 24, 2026 and September 18, 2026 respectively.
| Parameter | StackChan World | Reachy's Brain |
|---|---|---|
| Price | Free | Free |
| Rating | 1.4 (8 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 6 days — better | Every 2 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 164 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | M5Stack Technology Co., Ltd. | Brthrs Agency |
In-app purchases
StackChan World
No in-app purchases
Reachy's Brain
No in-app purchases
Questions
Is StackChan World free?
Is Reachy's Brain free?
Do StackChan World or Reachy's Brain have ads?
Which is updated more often, StackChan World or Reachy's Brain?
Other comparisons
