Best Heavy-Duty, Diesel and Fleet Repair Software (2026)

If you run a diesel or heavy-duty shop, the best heavy duty truck repair software is the one built around service orders for Class 4-8 trucks, not a light-vehicle tool with a “trucks” checkbox bolted on. We looked at five platforms that shops servicing commercial trucks and fleets actually run their day on, scored each one against our rubric, and picked clear winners for different kinds of shops.

The short version: Fullbay is the strongest all-around pick for dedicated heavy-duty and diesel work, Tekmetric wins for growing shops that lean light and medium duty, and Mitchell 1 is the repair-data heavyweight if you need OEM procedures under the hood. Below we break down pricing, features, real owner complaints, and who each one fits.

STS Verdict

Fullbay is the best heavy duty truck repair software for shops whose bays are full of Class 4-8 trucks, trailers, and diesel fleet work. It handles the whole repair order-to-invoice loop the way a truck shop actually works, and its move into predictive maintenance with the Pitstop acquisition pushes it ahead of general shop tools retrofitted for trucks.

9.2

STS GoldBest heavy-duty shop management software

The Best Heavy-Duty Truck Repair Software at a Glance

Two kinds of software show up in every heavy-duty shop. One runs the business: repair order (RO) management, parts inventory management, invoicing, scheduling, and reporting.

The other feeds the techs OEM-level repair information: wiring diagrams, technical service bulletins (TSBs), diagnostic trouble codes (DTCs), and labor time estimates. Most truck shops need both.

This guide focuses on shop management platforms, with the diagnostic and repair-data tools covered where they matter. Here is how the five stack up.

Every score in this guide comes from our own rubric. We weigh Class 4-8 coverage, RO workflow, parts depth, repair-data access, fleet features, pricing transparency, integrations, mobile access, and documented owner feedback.

You can see exactly how the numbers break down in how we score. This is one of many independent auto repair software reviews we publish, and no vendor pays for placement.

How We Chose the Best Heavy-Duty Truck Repair Software

Heavy-duty shops have different problems than light-duty shops, so we scored for those problems first. A brake job on a Class 8 tractor is not a brake job on a Camry. The parts catalog is different, the labor times are different, and the cost of downtime is far higher when a fleet truck sits.

Our evaluation looked at nine things: how well the platform covers Class 4-8 trucks, how the repair order flows from write-up to invoice, how deep parts inventory management goes, whether OEM repair info (wiring diagrams, TSBs, DTCs, labor time estimates) is reachable, fleet maintenance features, pricing honesty, the integrations you already use, mobile access, and what owners consistently report after living with the software.

Why the extra scrutiny on trucks? A fleet customer that runs 40 trucks does not care about a slick customer portal nearly as much as it cares about downtime reduction and clean repair documentation for DOT compliance.

A dropped inspection record can turn into an out-of-service violation and a liability headache. That reality shapes what “good” software means here.

We built these scores from vendor pricing pages, documented owner feedback, feature research, and live search data. We hold ASE-style standards for what counts as real repair-data coverage, and the ASE certification framework is a decent proxy for the kind of procedure depth a heavy-duty tech needs on the bench.

One honesty note: we do not review pure diagnostic hardware and scan tools as standalone products here. Tools like Noregon JPRO Professional, ALLDATA Heavy Truck, and Identifix Direct-Hit Truck come up for context because most truck shops pair them with a shop management system, but they are a separate buying decision. We cover that pairing in its own section below.

Fullbay Review: Best Heavy-Duty Truck Repair Software Overall

Fullbay is the one platform on this list that was built from the ground up for heavy-duty and diesel shops, not adapted from a car-shop tool. If your bays are full of trucks, trailers, and fleet accounts, this is where we would start. It earns an STS Score of 9.2 and STS Gold.

The core is standard shop management done for trucks: the full repair order lifecycle, parts ordering, labor time lookup, invoicing, a customer portal, scheduling, and reporting. What sets it apart is how it handles fleet customers. You can track multiple units under one account, schedule preventive maintenance per truck, and bill fleets the way they expect to be billed.

The fleet side is the real reason diesel shops pick it. Managing 30 units for a single customer inside a light-duty tool means fighting the software all day. Fullbay treats each unit as its own record with its own service history, which cuts the parts-lookup and write-up time that eats a service advisor’s morning.

Fullbay current Updates

Fullbay unveiled its first AI feature, Fullbay AI, at Diesel Connect 2025 in Phoenix. It takes a tech’s typing or talk-to-text and cleans up rough repair notes into clear, professional documentation. For a shop where techs would rather turn wrenches than write, that is a genuine time-saver on labor documentation.

Fullbay also acquired Pitstop, a predictive maintenance platform, and launched a Mitchell 1 integration. That integration connects Fullbay to TruckSeries for Class 4-8 vehicles and ProDemand for light-duty work, available as a separate subscription. The Pitstop move is the closest any platform here gets to telematics-driven, predict-the-failure-before-it-happens maintenance.

Fullbay Pricing

Fullbay publishes tier names but not dollar figures on its own site. Based on our research, the documented going rates are: Basic around $188/mo for one user, Pro around $258/mo, and Elite around $318/mo, each with per-user add-ons in the $89 to $119/mo range, plus a quote-based Enterprise tier.

Agreements are billed monthly under an annual commitment. Confirm the current quote with the vendor, since Fullbay sets pricing by shop.

Fullbay Pros and Cons

Who Fullbay is not for: light-duty-only shops, anyone who needs a strong built-in labor guide for passenger cars, or a one-bay operation that can’t clear the entry price. For everyone servicing trucks, it is the pick. Our full Fullbay review goes deeper on the fleet billing workflow.

Tekmetric Review: Best for Growing Light and Medium Duty Shops

Tekmetric is the best cloud shop management software for independent and multi-location shops that mostly service light and medium duty vehicles. It runs in your web browser with nothing to install, and it nails the whole RO-to-invoice loop with digital vehicle inspections (DVI), MOTOR labor times, and live parts ordering baked in. It scores an STS 9.2 and STS Gold.

Tekmetric STS Score Breakdown

9.2/10

STS Gold

The reason it lands here and not at the top for heavy-duty is simple: Tekmetric is not purpose-built for Class 4-8 diesel work. It has limited OEM truck repair data, no native DOT compliance tools, and no ELD integration.

If you run a mixed shop with some medium-duty work, it is excellent. If you are a dedicated diesel shop, it is the wrong layer.

Where it shines is the modern feel and the fact that every paid plan includes unlimited users and unlimited repair orders. That flat-rate approach means you are not counting seats as you grow. The customer communication tools and the third-party integration library are among the best in the category.

Tekmetric current Updates

At its Tektonic Auto Repair Conference in Houston, Tekmetric announced four products aimed at winning and keeping customers. Tekmetric Digital Ads helps a shop rank in Google Maps and Yelp for searches like “brake repair near me,” and it launched in early access with a 30-day free trial and $300 in ad credits.

Tekmetric Phones, built on a RingCentral integration, pops a caller’s full profile the moment the phone rings: their history, vehicles, open repair orders, and upcoming appointments. Earlier in the year the platform added Inventory Cost Reporting, Custom Customer Segments, and Permission Groups with Multi-Shop Permissions Management for controlling who can see and do what across locations.

Tekmetric Pricing

Pricing is per shop location, with an Enterprise tier by quote. Add-ons include Multi-Shop at about $70/mo per shop, Tire Suite at about $39/mo per shop, and Marketing at about $345/mo per shop.

There is no onboarding fee and no contract, which is a big part of why it scores so well on pricing value. No free trial is publicly advertised.

Tekmetric Pros and Cons

Who Tekmetric is not for: dedicated diesel or heavy-duty-only shops, and anyone who needs deep truck-specific parts catalogs or commercial wiring diagrams. For a growing light and medium duty operation, it is a top pick. We break down the full workflow in our Tekmetric review, and if you want to line it up against another modern platform, our Fullbay vs Tekmetric comparison is the one to read.

Mitchell 1 Review: Best for Repair Data Depth Across Cars and Commercial Trucks

Mitchell 1 is the repair-info gold standard bolted onto a deep shop management system. If your techs live in repair procedures all day, nothing here matches its data. It earns an STS 8.4 and STS Silver, held back by a dated interface and a daily experience that frustrates owners.

Mitchell 1 (Manager SE + ProDemand) STS Score Breakdown

8.4/10

STS Silver

Understand the two-product split before you buy. Mitchell 1 Manager SE is the shop management platform: RO management, invoicing, scheduling, and reporting. Mitchell 1 ProDemand is the OEM repair-data product for cars and light trucks.

Mitchell 1 TruckSeries is the separate repair-data subscription for Class 4-8 commercial trucks. Yes, Mitchell 1 covers heavy duty, but through TruckSeries, not Manager SE alone.

The repair data is the whole point. OEM repair procedures, wiring diagrams, TSBs, diagnostic trouble codes, and labor time estimates are the deepest in this roundup. For a shop that already estimates and parts inside ProDemand every day, having repair data and shop management in one workflow is the draw.

Mitchell 1 current Updates

Mitchell 1 launched Manager SE Inspections, a next-generation multi-point inspection (MPI) tool built right into Manager SE for both automotive and commercial truck markets. Inspection items automatically convert into job containers through Job View Integration, so there is no double-entry from inspection to estimate. Templates are customizable, and it supports rich photo and video documentation.

Manager SE 9.2 also improved Revisions in Job View, letting shops create unlimited Sub-Estimates per vehicle. The old nine-estimate cap is gone, which matters when you are quoting a fleet truck with several possible repair paths. And the new Fullbay integration means heavy-duty shops can reach TruckSeries and ProDemand data from inside Fullbay’s interface if they prefer that workflow.

Mitchell 1 Pricing

Mitchell 1 does not publish prices. Subscription and Teamworks bundles are sold through the sales team, with no starting price on the vendor site. One owner reported a bundle running under $500/mo, which is a useful ballpark but not a quote.

TruckSeries pricing is not publicly listed; contact Mitchell 1 directly for a current quote. Additional-user licenses are sold separately.

Mitchell 1 Pros and Cons

Who Mitchell 1 is not for: shops that want fully transparent self-serve pricing, mobile-first operations, or a lightweight starter tool. For a data-driven general repair shop, it is hard to beat under the hood. See the deeper breakdown in our Mitchell 1 Manager SE review.

NAPA TRACS Review: Best Budget-Friendly Option for Small Shops

NAPA TRACS is the budget pick, and it has the lowest published starting price in this roundup. It is a deep, NAPA-backed shop management platform with the Mitchell 1 labor guide and the NAPA parts catalog built right in. It scores an STS 8.4 and STS Silver, held back by a dated interface and a learning curve.

NAPA TRACS STS Score Breakdown

8.4/10

STS Silver

The buyer here is a small independent shop, and the feedback bears that out: the vast majority of its users come from small businesses. If you already buy NAPA parts, the tight catalog integration cuts friction on ordering and reduces the parts-lookup steps that pile up over a day.

Core features cover the basics well: repair order management, the NAPA parts catalog, invoicing, customer history, scheduling, and reporting. What it does not do is heavy duty. There is limited Class 4-8 truck-specific data, no native DOT compliance, and no real fleet management depth.

NAPA TRACS Pricing

There is also a Platinum Plus tier around $369/mo. No annual discount or contract terms are published, and digital inspections are a paid add-on, so factor the DVI cost into your real monthly spend. There is no free version and no free trial.

NAPA TRACS Pros and Cons

Who NAPA TRACS is not for: heavy-duty and diesel-focused shops, multi-location operations needing advanced permissions, and anyone who needs deep OEM repair data. For a NAPA-loyal small shop watching the budget, it is a smart buy. More detail in our NAPA TRACS review.

R.O. Writer Review: Best for High-Volume Shops Needing Deep Customization

R.O. Writer is a deep, shop-floor-proven platform that does the repair-specific stuff right.

If you run high volume and need to bend the workflow to match how your shop actually operates, this is the mature option. It scores an STS 8.4 and STS Silver, with the usual caveats about a dated interface and add-on costs.

R.O. Writer STS Score Breakdown

8.4/10

STS Silver

The strength is configurability. Highly customizable RO workflow, detailed parts and labor tracking, multi-location support, flat-rate labor, multi-supplier parts, and DVI in one system.

It rewards experienced shop managers who know exactly what they want. Newcomers tend to feel the depth as complexity.

For fleet and commercial work, it offers fleet account management, fleet billing, and preventive maintenance scheduling, which makes it viable for shops running mixed fleets. But like the other shop management tools here, it is not an OEM repair-data provider. For Class 4-8 wiring diagrams, TSBs, and DTCs, you will pair it with a TruckSeries or ALLDATA Heavy Truck subscription.

R.O. Writer Pricing

R.O. Writer publishes intro pricing on its site: Essentials at $199/mo and the R.O. Writer plan at $299/mo, both first-year rates.

The top multi-location tier is custom quote. Expect implementation and training fees plus add-on costs for the DVI Suite, Accounting Link, and payments on top of the base subscription, so the real number lands higher than the sticker.

R.O. Writer Pros and Cons

Who R.O. Writer is not for: small shops that want plug-and-play simplicity, anyone who needs fully transparent self-serve pricing, or a mobile-first crew.

For an established high-volume or multi-location shop, the depth pays off. See our Protractor review if you want another multi-location option to weigh against it.

Shop Management Software vs. Diagnostic Software: What Heavy-Duty Shops Actually Need

This trips up a lot of shop owners, so let’s make it plain. There are two categories, and one tool almost never covers both.

Shop management software runs the business side: the RO lifecycle, invoicing, scheduling, customer management, and parts inventory management. That is Fullbay, Tekmetric, NAPA TRACS, R.O. Writer, and Mitchell 1 Manager SE.

OEM repair data and diagnostic software feeds the techs: wiring diagrams, TSBs, DTCs, labor times, fault code analysis, and ECU scanning. That is Mitchell 1 TruckSeries, ALLDATA Heavy Truck, Noregon JPRO Professional, and Identifix Direct-Hit Truck. JPRO Professional in particular is a multi-brand diagnostics tool used to read fault codes and run bidirectional tests across mixed fleets, which is why so many diesel shops keep it on the bench.

Most heavy-duty shops need both categories.

Assuming one tool covers everything is the most common buying mistake we see. The common pairings are clean: Fullbay plus Mitchell 1 TruckSeries (now natively integrated), Manager SE plus TruckSeries (same vendor), or R.O. Writer plus ALLDATA Heavy Truck.

Budget for two subscriptions. TruckSeries pricing requires a direct quote from Mitchell 1, and that data layer alone is a real line item on top of your shop management cost. Many shops add a diagnostic tool like JPRO as a third layer for deep multi-brand ECU work.

Our recommendation framework: if your bays are primarily Class 4-8 diesel, start with Fullbay as your shop management layer and add TruckSeries or ALLDATA Heavy Truck for repair data. Not sure which combination fits your shop? Our find-your-match tool walks you through it.

Side-by-Side Pricing Comparison: Heavy-Duty and Fleet Repair Software

Only NAPA TRACS and Tekmetric publish full tier pricing openly. The other three want a conversation before they name a number, which is your opening to negotiate: ask about annual billing, waived onboarding, and included user seats.

Remember total cost of ownership, not just the sticker. Add per-seat licensing, add-ons like DVI, a separate diagnostic-data subscription, onboarding and training fees, and any hardware.

Run your labor rate and margins through our shop margin calculator so the software line item actually fits your numbers. You can also line up any two platforms side by side on our full comparison chart.

DOT Compliance, ELD Integration, and Fleet Features: The Gap Worth Watching

Here is where heavy-duty shops get surprised. For a shop servicing Class 4-8 vehicles, repair documentation is not just paperwork.

Failed inspections, out-of-service violations, and liability all trace back to how well a repair was documented. Your software either supports that or it doesn’t.

DOT compliance matters because fleet customers lean on your repair records to keep their trucks legal and their drivers safe. The federal safety standards that govern commercial vehicles, enforced under NHTSA and the broader DOT framework, mean a sloppy or missing inspection record can cost a fleet real money and cost you the account.

ELD integration is the next frontier. An Electronic Logging Device tracks how a truck is used.

Software that can pull usage data, fault codes, and maintenance triggers from ELD systems lets a shop schedule service before a truck breaks down instead of after. That is the difference between planned maintenance and a tow.

The honest current state: most shop management platforms in this roundup do not natively include DOT compliance modules or ELD integration. Fullbay’s Pitstop acquisition is the closest move toward predictive, telematics-driven maintenance, using vehicle data to flag likely failures before they strand a truck. The rest are stronger on documentation than on live telematics.

Truck-specific parts catalogs matter too. A generic light-duty catalog won’t carry the multi-axle, heavy-duty parts you need, so check that any platform ties into heavy-duty supplier networks, not just car-parts sources.

Expect this gap to close. As fleet electrification and telematics adoption speed up, heavy-duty shop software will keep adding DOT and ELD features. For now, the shops that win are the ones that pick a platform strong on documentation and pair it with the right diagnostic and telematics layer.

How to Choose the Best Heavy-Duty Truck Repair Software for Your Shop

Start with your shop type. A pure diesel or heavy-duty shop should default to Fullbay plus a repair-data subscription. A mixed light-and-heavy shop can run Tekmetric or Mitchell 1 for the light side and add TruckSeries for the trucks.

A fleet-only maintenance operation should weigh Fullbay’s per-unit PM scheduling heavily. A multi-location operation should look at R.O. Writer or Tekmetric’s multi-shop permissions.

Then answer five questions before you sit through a single demo:

• Do you need shop management, repair data, or both? (Most truck shops need both.)
• What is your current tech stack, and which integrations are non-negotiable? (QuickBooks, your parts suppliers, your diagnostic tool.)
• How many users and locations do you need to support?
• What is your real monthly budget, including add-ons and a diagnostic-data subscription?
• How much do your techs need mobile access in the bays?

Watch for red flags during demos: opaque pricing with no cancellation terms, weak heavy-duty parts catalog depth, no mobile access, and no DOT or fleet compliance documentation. Our list of questions to ask in every software demo is worth keeping open on your phone during the call.

One thing competitors gloss over: migration. When you switch platforms, ask exactly how your data exports, what formats you get, how much onboarding support is included, and how long staff retraining takes.

Budget for a few days of slower throughput during the changeover. Our implementation checklist keeps you from losing history in the move.

Which One Is Right for Your Shop?

Real-World ROI: What Shop Owners Report After Switching

We don’t have vendor case-study data, so what follows is drawn from documented owner feedback, not proprietary numbers. Ask any shortlisted vendor for their own case studies during your evaluation.

The outcomes owners talk about cluster in a few areas: time saved per repair order, faster parts lookup, cleaner invoices with fewer disputes, and fewer no-shows once customer communication tools kick in. Those add up to real downtime reduction for fleet customers, which is the metric a fleet manager cares about most.

On Fullbay specifically, owners point to better repair-note quality once Fullbay AI cleans up tech write-ups, and faster fleet billing cycles for shops running fleet accounts. For a shop billing 40 units a month, tighter billing is real cash-flow improvement.

Tekmetric owners running the full suite report better multi-location visibility and stronger customer retention once Digital Ads and Phones are in play. Mitchell 1 owners cite less estimate-revision time thanks to unlimited Sub-Estimates in 9.2, and a faster inspection-to-invoice flow with Manager SE Inspections.

The honest counterpoint: heavy onboarding, retraining time, and integration fees can push ROI out three to six months. Anyone promising instant payback is selling. Set the expectation with your team that the first quarter is investment, and the return shows up after.

The Bottom Line: Best Heavy-Duty Truck Repair Software

If your bays are full of Class 4-8 trucks, trailers, and diesel fleet work, get Fullbay and pair it with Mitchell 1 TruckSeries for repair data. Nothing else here is built for trucks from the ground up, and the fleet features plus the Pitstop predictive-maintenance move put it ahead.

If you run mostly light and medium duty and want a modern platform your team will actually enjoy using, get Tekmetric.

If your shop lives in repair procedures all day and you can tolerate a dated interface, Mitchell 1 has the deepest data. NAPA TRACS is the budget pick for small NAPA-loyal shops, and R.O. Writer rewards high-volume operations that want to customize everything.

Whatever you shortlist, budget for two subscriptions, confirm your trial end date in writing, and ask about the DOT and telematics features that most vendors still gloss over. Get those right and the software pays for itself in fewer disputes and less truck downtime.

Shop Tech Score Team

We spent 14 years owning and running an independent auto repair shop before building Shop Tech Score. Now that experience has one job: scoring every major platform on the same five-factor rubric and maintaining the industry's only editor-verified pricing index. If a vendor raised prices this quarter, the number on this site is already updated.