Quick Overview
ScanFixAI is an AI-powered diagnostic tool with dealer-level diagnostics for 61 makes with 1,175 total coding options. It features AI root cause analysis, Test Drive mode with voice guidance, as-built read/write, used car inspection with odometer fraud detection, and a fix probability database. Works on Windows and Android.
Carly is a popular multi-make OBD2 app with basic diagnostics, limited coding presets, and a used car check feature. It runs on iOS and Android, starts at $6/month, and requires Carly's own $59.90 Bluetooth adapter for full functionality. It's well-known and widely marketed but limited in coding depth.
Feature Comparison
| Feature | ScanFixAI | Carly |
|---|---|---|
| Coding Options | 1,175 across 61 makes | Limited presets (20-50 per make) |
| As-Built Read/Write | Yes — all makes + factory comparison | No |
| AI Root Cause Analysis | Yes — correlates DTCs across modules | No |
| AI Mechanic Chat | Yes (no adapter needed) | No |
| Test Drive Mode | Voice-guided live monitoring + auto-fix | No |
| Photo Diagnosis | Yes | No |
| Fix Probability Database | 759 real repair statistics | No |
| Used Car Check | Mileage fraud + all modules + BUY verdict | Basic used car check |
| Module Scanning | All modules, all makes | Varies by make |
| Live Data | 68 PIDs with graphing | Basic live data |
| NHTSA Recalls/Complaints | 95,630 complaints + recall lookup | No |
| Health Report | PDF with shop branding | Basic report |
| Android | Yes | Yes |
| iOS | Not yet | Yes |
| Windows | Yes (32 & 64-bit) | No |
| Required Adapter | Any ELM327/OBDLink | Carly adapter ($59.90) recommended |
| Price (full features) | $29.99/mo or $249.99/yr | ~$21/mo (Carly Pro) + $59.90 adapter |
Coding Depth: The Biggest Difference
This is where ScanFixAI pulls far ahead. Carly offers a handful of preset coding options per vehicle make — typically toggle switches for popular features. ScanFixAI has 1,175 coding options with deep per-make coverage:
| Vehicle Make | ScanFixAI Options | Carly Options |
|---|---|---|
| Ford | 316 | ~20-30 presets |
| BMW | 75 | ~40-50 presets (best coverage) |
| GM (Chevy/GMC/Buick/Cadillac) | 48 | ~15-25 presets |
| VW/Audi | 552 | ~20-30 presets |
| Toyota/Lexus | 54 | ~10-20 presets |
| Honda/Acura | 48 | ~10-15 presets |
| Chrysler/Jeep/Dodge | 59 | ~15-20 presets |
| Hyundai/Kia | 11 | ~10-15 presets |
Plus, ScanFixAI offers as-built read/write with factory data comparison — something Carly doesn't support at all. This lets you back up, restore, and modify vehicle configurations at the byte level.
Where Each Tool Excels
ScanFixAI Advantages
- 1,175 coding options vs Carly's limited presets
- 352 guided diagnostic trees across all makes
- 264 TSBs with parts cross-reference
- J2534 professional adapter support
- As-built read/write (Carly can't do this)
- AI root cause analysis across all modules
- Test Drive mode with voice-guided fixes
- Photo-based diagnosis
- Fix probability database (759 real repairs)
- 95,630 NHTSA complaints database
- Works with any OBD2 adapter (no proprietary hardware)
- Windows support for laptop/desktop use
- AI mechanic chat (no adapter needed)
- Professional PDF reports with shop branding
Carly Advantages
- iOS support (ScanFixAI is Android/Windows only)
- Lower base price ($6/month for basic)
- Well-known brand with heavy marketing
- Simpler interface for basic tasks
- Established user base
- Basic used car check feature
True Cost Comparison
| Item | ScanFixAI | Carly |
|---|---|---|
| App (annual, full features) | $249.99/yr | ~$252/yr (Pro at $21/mo) |
| Required Adapter | $20-100 (any ELM327/OBDLink) | $59.90 (Carly adapter) |
| Year 1 Total | $270-350 | $312 |
| What You Get | 1,175 coding, AI, as-built, Test Drive, photo diagnosis | Limited presets, basic diagnostics |
At similar annual costs, ScanFixAI delivers dramatically more functionality — AI diagnosis, 1,175 coding options, as-built read/write, and features Carly simply doesn't have.
The Verdict
Frequently Asked Questions
Is ScanFixAI better than Carly?
ScanFixAI has significantly more coding depth (1,175 options vs Carly's limited presets per make), AI root cause analysis, Test Drive mode with voice guidance, as-built read/write, and a fix probability database — none of which Carly offers. Carly has iOS support, a used car check feature, and a lower base price ($6/month). For coding and AI diagnosis, ScanFixAI is the better tool.
How much does Carly cost compared to ScanFixAI?
Carly starts at $6/month for basic features, but the full Pro plan (with coding) is approximately $21/month. Plus Carly requires their own $59.90 adapter. ScanFixAI is $29.99/month for full access with 1,175 coding options and works with any ELM327 adapter.
Does ScanFixAI have more coding options than Carly?
Yes, significantly more. ScanFixAI has dealer-level diagnostics for 61 makes with 1,175 total coding options. Carly offers limited preset coding options per make, typically 20-50 depending on the vehicle. ScanFixAI also offers as-built read/write, which Carly does not.
Does Carly have AI diagnosis like ScanFixAI?
No. Carly reads codes and provides basic explanations, but it does not have AI root cause analysis, AI mechanic chat, photo-based diagnosis, Test Drive mode with voice, or a fix probability database. These are all ScanFixAI-exclusive features.