Comparison

Metawatch vs OBD Diagnostics

Price, ratings, monetisation and update history for both apps, side by side β€” with what reviewers say about each.

Head to head
About

Metawatch

Features
Read full description

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.

About

OBD Diagnostics

Features
Read full description

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 vehicle’s 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 car’s 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 vehicle’s 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 vehicle’s 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 car’s performance and health.

Screenshots

Metawatch4 screens
OBD Diagnostics4 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. OBD Diagnostics sells 1 one-off in-app purchase. Metawatch asks for nothing beyond the download.

UpkeepUpdate frequency

Metawatch ships an update every 8 days, OBD Diagnostics monthly. The most recent releases landed on September 19, 2026 and September 18, 2026 respectively.

Scorecard4 real differences Β· 2 level
Metawatch versus OBD Diagnostics: the parameters behind the verdict, then further details
ParameterMetawatchOBD Diagnostics
PriceFreeFree
Update frequencyEvery 8 days β€” betterMonthly
AdsNo β€” betterYes
In-app purchasesNo β€” betterYes
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.1 β€” better26.2
Further details β€” not scored
Size192 MB23 MB
Age rating17+4+
DeveloperXi'an Shenju Zhilian Network Technology Co., LtdEJSmith

In-app purchases

None

Metawatch

No in-app purchases

1 purchases

OBD Diagnostics

One-time1
  • Remove Ads$1.99

Questions

Is Metawatch free?
Metawatch is free to download, with no in-app purchases.
Is OBD Diagnostics free?
OBD Diagnostics is free to download, with in-app purchases available.
Do Metawatch or OBD Diagnostics have ads?
OBD Diagnostics shows ads; Metawatch does not.
Which is updated more often, Metawatch or OBD Diagnostics?
Metawatch ships an update every 8 days, and OBD Diagnostics monthly. Most recently, Metawatch was updated on September 19, 2026 and OBD Diagnostics on September 18, 2026.

Other comparisons