BY COLLINGHAMCO
Best Car Build Log Apps in the UK 2026 — Ranked & Compared
We tested every car build log and modification tracker available in the UK in 2026. Here's the honest ranked list — and why the right choice depends entirely on what you're building.
If you're serious about modifying your car, you already know the problem. Receipts in a drawer. Photos spread across three camera rolls. A running total in your head that you're definitely underestimating. By the time you sell the car, half the history is gone — and so is thousands of pounds of resale value.
Car build log apps solve that. But not all of them are built the same way. We've tested every meaningful option available to UK car enthusiasts in 2026 and ranked them honestly.
1. MODLOG — Best for Modified Cars 🥇
modlog.online | Free / £3.99 Pro / £19.99 Trade
MODLOG is the only platform built specifically for the car modification community. Every feature is designed around one question: what have you done to your car, what did it cost, and who did it?
What makes it stand out:
- Modification-first structure — categories (Engine, Suspension, Exhaust, Wheels, etc), costs, supplier, date fitted, photos
- Public build profiles and a community leaderboard ranked by total investment
- "Where to Buy" links — see a part on someone's build, click to buy it (Pro)
- PDF build report for sale provenance (Pro)
- VRM lookup via the DVLA database — enter your reg, your car populates instantly
- AI receipt scanning — photograph an invoice, mod is logged automatically
- Trade tier for workshops and tuners — business profiles with proximity-based lead gen
- Marketplace — buy parts directly from real builds
- Spend analytics — category breakdown and trend charts
Best for: Anyone who modifies their car. Daily drivers, project cars, track cars, stance builds, performance builds. If you've changed something on your car, MODLOG tracks it.
Verdict: The best modification tracker available in the UK. Nothing else comes close for builders.
2. Custodian — Best for Classic & Prestige Owners 🥈
custodian.club | Free (insurance-monetised)
Custodian launched in 2020 and has 70,000+ members. It's well-designed and excellent for what it does — managing the ownership experience for classic and prestige cars.
Strengths:
- Digital history files — upload documents, invoices, MOT certificates
- Specialist insurance brokerage — their main USP and revenue model
- The Showroom — dealer marketplace for classic/prestige cars
- Car handover — transferable digital profile when you sell
- Clean mobile app (iOS and Android)
Weaknesses for builders:
- No modification-specific tracking (document-focused, not mod-focused)
- No community, leaderboard, or social features
- No spend analytics by category
- No parts marketplace between enthusiasts
- No VRM-to-spec lookup
Best for: Classic car owners, collectors, high-value car owners who want a clean paper trail for insurance and provenance.
Verdict: Excellent for its audience — but that audience isn't the modification community.
3. Track My Mods — Basic but Functional 🥉
trackmymods.com | Free tier available
Track My Mods is a simple modification tracker that does the basics — log a mod, add a cost, upload a photo.
Strengths: Simple. Gets the job done for basic logging.
Weaknesses: No UK VRM integration. No community features. No analytics. No marketplace. UI feels dated. No dedicated mobile app.
Verdict: Fine for a basic list. Not built for serious builders.
4. MotorMia — AI Visualisation, Not Tracking
motormia.app | Free / Paid tiers
MotorMia is an AI-powered modification visualiser — you upload a photo of your car and it renders what certain mods might look like. Interesting concept, but it's a visualisation tool, not a build log.
Verdict: Fun tool, completely different purpose. Doesn't compete with dedicated build loggers.
What to Look For in a Car Build Log App
1. Does it track modifications specifically? Not just documents — actual mods with categories, costs, suppliers, and photos.
2. Does it have a community? A build log you can share is ten times more motivating than a private spreadsheet.
3. Does it help you sell the car? Documented builds sell for more. Look for apps that export your full history as a shareable PDF or link.
4. Does it integrate with UK systems? VRM lookup via the DVLA database saves you 10 minutes every time you add a new car.
5. Does it work for your tier? Daily driver modifier? Track car builder? Classic restorer? Trade workshop? The best app depends on what you're building.
The Final Verdict
| App | Modified Cars | Community | Analytics | VRM | Marketplace | UK-Focused | |---|---|---|---|---|---|---| | MODLOG | Best-in-class | Yes | Yes | Yes | Yes | Yes | | Custodian | Basic | No | No | No | Dealers only | Yes | | Track My Mods | Basic | No | No | No | No | No | | MotorMia | Visualiser only | No | No | No | No | No |
If you modify your car — even a little — MODLOG is the clear choice. It's the only platform built from the ground up for the modification community.
Start free at modlog.online. Log your first mod today.
Last updated: June 2026. Rankings based on feature testing, UK market relevance, and community feedback.
