Metawatch vs OBD Diagnostics
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Metawatch
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The Metawatch App supports control of the smartwatch, including: 1. Transferring local music files to the watch. 2. View sports and health information on the watch. 3. Installing beautiful video dials for the watch. 4. Manage your personal account. *Special reminder: * Metabatch App health data is for reference only and cannot be used for medical diagnosis. If you feel unwell, please seek medical attention as soon as possible.
OBD Diagnostics
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OBD Diagnostics turns your iPhone into a powerful real-time vehicle data scanner, dashboard, session recorder, and AI analysis tool. Connect to supported Bluetooth OBD-II adapters, including Veepeak and compatible ELM327-style adapters, to read live vehicle data directly from your car. View key engine metrics, track driving sessions, graph sensor data, and send your recorded measurements to AI for personalized analysis based on your vehicleβs make, model, year, and engine. Whether you are troubleshooting a check engine light, monitoring engine performance, reviewing fuel trims, checking battery voltage, or learning how your vehicle behaves over time, OBD Diagnostics helps make your carβs data easier to understand. **Real-Time OBD-II Dashboard** Monitor live data from your vehicle with a clean, easy-to-read dashboard. View supported OBD-II PIDs such as: Engine RPM Vehicle speed Coolant temperature Battery voltage Engine load Short-term fuel trim Long-term fuel trim Oxygen sensor readings Fuel level Additional supported sensor values Large gauges, live value cards, and quick-access charts help you focus on the vehicle data that matters most. CarPlay support with live data. Shortcut actions to automatically connect and start as well as disconnect and stop analysis. **Interactive Graphs** Visualize your vehicleβs live data with real-time graphs. Select up to 10 dashboard PIDs and track changing values over the last 60 seconds. Great for reviewing RPM changes, coolant temperature rise, fuel trim movement, voltage behavior, speed changes, oxygen sensor activity, and engine load patterns. **Session Recording and History** Record OBD-II sessions and review them later. Each session can include duration, sample count, vehicle information, VIN when available, make, model, year, engine, battery voltage, and min/max/average stats for recorded metrics. Use session history to compare drives, spot changing patterns, and better understand intermittent vehicle issues. **AI Vehicle Analysis** Send recorded session logs to AI for a plain-language review of your vehicle data. OBD Diagnostics can analyze readings using your vehicleβs make, model, year, and engine to help explain performance trends and possible areas to watch. AI analysis can help summarize coolant temperature, RPM, speed, battery voltage, oxygen sensor readings, engine load, fuel trims, and other supported metrics. Choose from multiple AI provider options, including Apple on-device AI where available, OpenAI, Gemini, Claude, xAI, or a custom URL. AI Analysis should NOT be considered a replacement to a professional automotive expert. Please use the data as a means to provide a rudimentory analysis of your vehicle. **Demo Mode** Explore the app without an adapter using Demo Mode. Simulate vehicle data, view dashboards, test graphs, record sessions, and preview AI analysis workflows before connecting to a real car. **Built for Drivers and DIY Mechanics** OBD Diagnostics is useful for car owners, DIY mechanics, used car shoppers, fleet users, and anyone who wants better visibility into vehicle health and performance. **Key Features** Real-time OBD-II Bluetooth data Veepeak and ELM327-style adapter support Live RPM and speed gauges Custom dashboard PID selection Interactive vehicle graphs Session recording and history Vehicle info and VIN capture when available Min, max, and average metric summaries AI-powered session analysis On-device AI option where supported Custom AI provider support Demo Mode for offline testing Clean dark-mode iPhone interface OBD Diagnostics combines live OBD-II data, Bluetooth scanner support, real-time charts, session tracking, and AI-powered vehicle analysis into one simple app for understanding your carβs performance and health.
Screenshots
Verdict
The clearest difference is in-app purchases: Metawatch at none against OBD Diagnostics's 1. Metawatch also leads on ads (none vs shown) and update cadence (every 8 days vs monthly). On price and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. OBD Diagnostics sells 1 one-off in-app purchase. Metawatch asks for nothing beyond the download.
Metawatch ships an update every 8 days, OBD Diagnostics monthly. The most recent releases landed on September 19, 2026 and September 18, 2026 respectively.
| Parameter | Metawatch | OBD Diagnostics |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 8 days β better | Monthly |
| Ads | No β better | Yes |
| In-app purchases | No β better | Yes |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.1 β better | 26.2 |
| Further details β not scored | ||
| Size | 192 MB | 23 MB |
| Age rating | 17+ | 4+ |
| Developer | Xi'an Shenju Zhilian Network Technology Co., Ltd | EJSmith |
In-app purchases
Metawatch
No in-app purchases
OBD Diagnostics
- Remove Ads$1.99
Questions
Is Metawatch free?
Is OBD Diagnostics free?
Do Metawatch or OBD Diagnostics have ads?
Which is updated more often, Metawatch or OBD Diagnostics?
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