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Best 27Th Codes Apps

224+ iOS apps curated and reviewed

4.4 avg rating
19 free apps
Updated June 2026

Every iPhone needs a few good 27th codes apps. We benchmark 224+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.

Top Picks for 27Th Codes

FIXD OBD2 Scanner#1

FIXD OBD2 Scanner by FIXD Automotive Inc

Clear Your Check Engine Light
Editor's Choice
🔧 Utilities
4.6😐(26K ratings)
FreeAdsIn-App Purchases
#46in Utilities
FIXD OBD2 Scanner screenshot 1
FIXD OBD2 Scanner screenshot 2
FIXD OBD2 Scanner screenshot 3
FIXD OBD2 Scanner screenshot 4
FIXD OBD2 Scanner screenshot 5
FIXD OBD2 Scanner screenshot 6

This app translates your car's diagnostic trouble codes into plain language, helping you understand potential issues and their severity. It provides maintenance reminders and offers advanced features like issue forecasting and emissions pre-checks with a premium subscription.

What We Love

  • 👍 Easy to use
  • 🚀 Quickly identifies problems
  • 💰 Saves money on mechanics
  • 🔍 Provides detailed diagnostic information

Room to Improve

  • 🔒 Requires subscription for full functionality
  • 💰 Expensive premium subscription
  • 🤖 Inconsistent performance across vehicles
BimmerCode#3

BimmerCode by SG Software GmbH & Co. KG

Worth Considering
📊 Productivity
4.7😊(20K ratings)
FreeIn-App Purchases
#81in Productivity
BimmerCode screenshot 1
BimmerCode screenshot 2
BimmerCode screenshot 3
BimmerCode screenshot 4
BimmerCode screenshot 5

Unlock hidden features and customize your BMW, MINI, or Toyota Supra. This app allows you to individually configure your vehicle for a personalized driving experience. Requires a compatible OBD adapter.

What We Love

  • 👍 Easy to use
  • 🚀 Excellent customization options
  • 💡 Useful for coding BMW features
  • 🚀 Works as advertised

Room to Improve

  • 🔒 Requires paid version to unlock full functionality
  • 🐛 Compatibility issues with some BMW models
  • 🐛 Occasional connection problems

More 27Th Codes apps to explore

4
Flir One
Flir One
Flir One
Thermal Camera for Smartphones
Free

This app transforms your smartphone into a thermal imaging device when connected to a compatible camera. It helps identify hidden issues like water damage, electrical faults, and HVAC problems with advanced visual enhancements and measurement tools. Document and share your findings easily.

Thermal camera viewCapture photos and videosTemperature spot measurements
📷 Photo & Video
(7.5K)
free with in-app purchases
5
Bluon HVAC
Bluon HVAC
Bluon HVAC
HVAC Tools
Free

Access a vast database of HVAC models, manuals, and part lists to speed up your work. Utilize an AI-powered troubleshooting tool or connect with experienced technicians for real-time support.

500,000+ HVAC unit databaseManuals and part listsAI troubleshooting tool (MasterMechanic)
🔧 Utilities
(4.4K)
ad-supported
6
OBD2 Car Scanner - EOBD Facile
OBD2 Car Scanner - EOBD Facile
OBD2 Car Scanner - EOBD Facile
Torque ELM327 Diagnostic Tool
Free

Transform your smartphone into a professional car diagnostic tool. Read and clear engine fault codes, monitor real-time sensor data, and perform advanced diagnostics without a mechanic. Supports a wide range of OBD2 compliant vehicles.

Read and clear engine fault codesMonitor real-time sensor dataTurn off check engine light
🔧 Utilities
(4.9K)
free with in-app purchases
7
HVACR Check & Charge
HVACR Check & Charge
HVACR Check & Charge
PT Charts Superheat Subcooling
Free

This app provides an instant mobile refrigerant charge calculator for HVACR applications. It supports various refrigerants and allows users to calculate the correct system charge based on superheat, subcooling, or airflow, along with environmental conditions.

Instant refrigerant charge calculatorSuperheat calculator (non-TXV)Subcooling calculator (TXV)
🔍 Reference
(17K)
free
8
OBDLink
OBDLink
OBDLink
by OBD Solutions LLC
Free

Transform your phone into a powerful car diagnostic tool. Read and clear trouble codes, monitor real-time engine data, and track fuel economy. Generate detailed reports for easy sharing and analysis.

Read and clear diagnostic trouble codesDisplay real-time vehicle dataCustomizable dashboards
✈️ Travel
(12K)
free with in-app purchases
9
LogTen Pilot Logbook
LogTen Pilot Logbook
LogTen Pilot Logbook
Digital Electronic Flight Log
Free

This digital flight logbook helps pilots track flight hours, currency, and certificates. It offers automated data entry, powerful analytics, and career advancement tools. Free for the first 50 hours of flight time.

Lightning-fast data entryAutomated and customizable loggingSyncs across all devices
🔧 Utilities
(10K)
free with in-app purchases
10
OBD2 Trouble Code
OBD2 Trouble Code
OBD2 Trouble Code
OBD ll Code Reader Guide
Free

Instantly look up your car's check engine codes on the go. Access a vast database of OBD2 codes with descriptions and potential causes for all major manufacturers. Save your search history for quick reference.

OBD2 code lookupCheck engine code descriptionsPossible cause identification
🔧 Utilities
(297)
free
11
SafetyCulture (iAuditor)
SafetyCulture (iAuditor)
SafetyCulture (iAuditor)
Conduct inspections and audit
Free

This operations platform empowers teams to conduct inspections, audits, and training with digital checklists and customizable forms. It streamlines issue resolution, asset management, and reporting, helping organizations improve safety and efficiency.

Conduct inspections and audits offlineCreate and customize dynamic checklistsGenerate and share professional reports
💼 Business
(31K)
freemium
12
OSHA-NIOSH Heat Safety Tool
OSHA-NIOSH Heat Safety Tool
OSHA-NIOSH Heat Safety Tool
by Centers for Disease Control and Prevention
Free

This tool helps outdoor workers stay safe by providing real-time heat index information and hourly forecasts specific to their location. It offers occupational safety recommendations and details on heat-related illnesses and their first aid.

Real-time heat index and risk levelsHourly heat index forecastOccupational safety recommendations
☀️ Weather
(292)
free
13
BimmerLink
BimmerLink
BimmerLink
by SG Software GmbH & Co. KG
Free
$39.99 | 100% OFF

This app provides direct access to your BMW or MINI vehicle's systems. Read and clear trouble codes from all control units, monitor real-time sensor values, and control features like exhaust flaps and active sound design. It also supports battery registration, DPF regeneration, and service resets.

Read and clear trouble codes from all control unitsDisplay real-time sensor valuesRemote control of exhaust flap
📊 Productivity
(7.6K)
free with in-app purchases
14
FireSync Shift Calendar
FireSync Shift Calendar
FireSync Shift Calendar
Full-Featured Calendar
Free

This app is a comprehensive calendar designed for firefighters, offering robust shift tracking, event management, and cloud integration. It allows users to manage trades, overtime, and personal events, with features like CertTracker and Expenditure tracking. It also syncs with other calendars and devices for seamless organization.

Firefighter shift schedule trackingEvent management (trades, overtime, personal)Cloud integration with FireSync Enterprise™
📊 Productivity
(9K)
paid
15
OBD JScan
OBD JScan
OBD JScan
by Piotr Bialic
Free

This app provides advanced diagnostics for Jeep, Chrysler, and Dodge vehicles. It allows users to read and clear trouble codes, view live sensor data, and access settings across all vehicle modules, including ABS and transmission.

Read/Clear Diagnostic Trouble CodesAccess Live Data from all sensorsView vehicle settings
🔧 Utilities
(1.3K)
free with in-app purchases
16
OBDeleven – OBD2 car scanner
OBDeleven – OBD2 car scanner
OBDeleven – OBD2 car scanner
Diagnostics, service & coding
Free

Transform your smartphone into a powerful car diagnostic and customization tool. Easily scan trouble codes, monitor live data, and access advanced features like coding and service functions for a wide range of car brands. Save time and money on car maintenance and personalization.

Basic OBD2 diagnosticsLive data monitoringAdvanced diagnostics for licensed brands
🔧 Utilities
(1.2K)
free with in-app purchases
17
USB-Connect
USB-Connect
USB-Connect
by U.S. Boiler Company, LLC.
Free

This tool connects to U.S. Boiler modulating condensing boilers via a Bluetooth adapter for commissioning, diagnostics, and service. It offers wizards for startup and troubleshooting, data logging, and remote support capabilities through a web portal.

Bluetooth connectivity to boilersCommissioning, diagnostic, and service functionsStartup, troubleshoot, and service wizards
🔧 Utilities
(16)
free
18
Pipe Trades Pro Calc
Pipe Trades Pro Calc
Pipe Trades Pro Calc
Calculator | Welding & Piping
Free

This app provides advanced calculation tools and comprehensive data for pipe trade professionals. It streamlines workflows for pipefitters, welders, and steamfitters with features for measurements, fluid dynamics, and material specifications. Designed for efficiency and accuracy, it works offline for on-site use.

Advanced measurement calculationsFluid dynamics and pressure analysisComprehensive pipe data access
🔧 Utilities
(3.6K)
free with in-app purchases
19
Ugly's Electrical References
Ugly's Electrical References
Ugly's Electrical References
by Informed Publishing
$12.99

This app provides electricians and electrical professionals with up-to-date digital information based on the National Electrical Code. It includes formulas, wiring diagrams, conduit bending guides, and calculators for various electrical calculations. The app is designed for on-the-job reference and works offline.

NEC 2026 updatesMathematical formulas and calculatorsConduit bending guide with videos
📊 Productivity
(1.5K)
paid
20
Copeland Mobile
Copeland Mobile
Copeland Mobile
by Copeland LP
Free

Access a vast database of product information for air conditioning and refrigeration systems on your mobile device. Quickly find specifications, diagrams, and diagnostic tools. Includes AI-powered assistance and a "Where To Buy" locator.

Intelligent HVACR Assistance chatbotOnline product information database accessAuto-fill model recommendations
🔍 Reference
(5.1K)
free with in-app purchases