Lewis vs ForgePilot Diagnostics
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lewis
This app connects to your car via a Bluetooth OBD2 adapter to diagnose issues in plain English. It uses AI to analyze trouble codes, provide severity ratings, and offer maintenance advice. You can also monitor live engine data and track your car's health over time.
- Plain English code explanations
- AI-powered diagnostic analysis
- Conversational AI mechanic
- Live engine data monitoring
- Car health tracking over time
- Works with 1996+ OBD-II vehicles
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Lewis connects to your car through any supported Bluetooth OBD2 adapter and tells you exactly what's going on under the hood: in plain English, not confusing codes. SCAN YOUR CHECK ENGINE LIGHT IN SECONDS Plug in your OBD2 adapter, tap Scan, and Lewis reads every diagnostic trouble code your car is throwing. No more guessing what P0301 means or whether it's safe to keep driving. Lewis breaks it down: what's wrong, how serious it is, and what to do about it. AI-POWERED DIAGNOSTICS Lewis doesn't just read codes — he understands them. Using advanced AI, Lewis analyzes your scan results in the context of your specific vehicle, past scans, and known patterns to give you a clear picture of your car's health. Get severity ratings, likely causes, and recommended next steps. ASK LEWIS ANYTHING Got a weird noise? Dashboard light you've never seen? Just ask. Lewis is a conversational AI mechanic who knows your car — its make, model, mileage, and full scan history. Ask follow-up questions, get maintenance advice, or figure out if that repair quote from the shop is fair. LIVE ENGINE DATA Monitor real-time data from your engine while you drive: RPM, coolant temperature, throttle position, boost pressure, engine load, and more. Extended data available for select vehicles including oil temperature, oil pressure, transmission temp, and torque. TRACK YOUR CAR'S HEALTH OVER TIME Every scan is saved automatically. Review your history, track recurring issues, and catch problems before they become expensive. Lewis analyzes trends across all your scans to spot patterns a single visit to the mechanic would miss. WORKS WITH YOUR CAR Lewis works with any 1996 or newer vehicle (OBD-II compliant) and connects via any standard Bluetooth OBD2 adapter. Extended diagnostics available for Alfa Romeo, BMW, Audi, and Mercedes with more makes coming soon. WHAT'S FREE • Full OBD2 scanning and code reading • DTC descriptions with severity ratings • Live engine data monitoring • Scan history LEWIS PRO • Unlimited AI scan analyses • Ask Lewis anything — full AI chat • Trend analysis across all your scans • Manage multiple vehicles • Extended vehicle readings Privacy Policy: https://www.thelewisapp.com/privacy Terms of Service: https://www.thelewisapp.com/terms
ForgePilot Diagnostics
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Built by a technician who's actually turned wrenches for 20 years, ForgePilot is the AI diagnostic co-pilot you wish you had at the bay. Pull a code. Scan a VIN. Ask Forgy what's likely. Get a real answer — grounded in OEM procedures, your shop's history, and the kind of diagnostic logic that takes a decade to learn. WHAT YOU GET - Forgy — an AI co-pilot trained for automotive diagnostics. Ask it about any DTC, any vehicle, any symptom. Get a focused diagnostic path, not a wall of generic text. - MOTOR-licensed procedures, torque specs, and DTC flowcharts — straight from the source, viewed in-app, never bounced to a browser. - Live OBD2 streaming via Bluetooth — pair your existing scanner (OBDLink MX+, Autel, Launch, others) and stream PIDs, freeze frame data, and live sensor readings in real time. - VIN scanner with camera + barcode + AI fallback — get the right vehicle profile in seconds. - Multi-format scanner screenshot support — snap a photo of any scan tool's screen, paste it into Forgy chat, get an analysis. - Vehicle history that persists — every car your shop touches builds a record. Pull it up next time. BUILT FOR SHOPS, NOT CONSUMERS ForgePilot isn't an OBD2 toy or a parts-buying app. It's a professional diagnostic tool for working technicians at independent shops. If you've ever wished your scanner had a brain — this is it. YOUR DATA IS YOURS We never sell your shop data. We never sell your customer info. We never train AI on your individual repair orders without permission. Read the full privacy policy at crimsonforge.pro/privacy — it's written in plain English. QUESTIONS? Reach us at admin@crimsonforge.pro. Designed in Colorado by Crimson Forge, Inc.
Screenshots
Verdict
The clearest difference is in-app purchases: ForgePilot Diagnostics at none against Lewis's 2. Lewis's advantage is update cadence (every 3 days vs fortnightly). On price, ads, device support and iOS requirement there is nothing between them.
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. Lewis sells 2 in-app purchases, starting at $12.99 per month. ForgePilot Diagnostics asks for nothing beyond the download.
Lewis ships an update every 3 days, ForgePilot Diagnostics fortnightly. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.
| Parameter | Lewis | ForgePilot Diagnostics |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 days — better | Fortnightly |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Freemium | — |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 86 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | Kunolu Applications | Crimson Forge Inc |
In-app purchases
Lewis
- Lewis Monthly$12.991 Month
- Lewis Annual$69.991 Year
ForgePilot Diagnostics
No in-app purchases









