Thunder Pro

Review by eFreeware

Thunder Pro is a business app from Thunder Pro LLC, built for people who run cleaning companies rather than for the customers who hire them. The pitch is straightforward: estimates, invoices, client payments and contracts handled in one place instead of spread across email threads and separate documents. It is free to install, with in-app purchases available, and it has passed 10,000 installs since arriving on October 31, 2023.

What makes it worth a closer look is the combination. Plenty of small-business tools can produce an invoice, and plenty can take a payment, but this one pairs both with cleaning-specific contract templates and a video library about running a cleaning operation. For a solo cleaner or a small crew, that is a narrower and more relevant package than a general-purpose invoicing service.

Estimates and invoices without the back-and-forth

The feature the developer puts first is instant estimates. You put together a quote for a residential or commercial job and send it out, and the app is built to handle both one-off work and recurring arrangements such as a monthly contract. That distinction matters in this trade, because a quote for a single deep clean and a quote for a standing weekly visit are not the same document, and having both shapes supported from the start saves fiddling.

Invoicing follows the same idea. Invoices are created and dispatched to clients from inside the app, which is the sort of task that otherwise eats an evening a week if you are doing it by hand. The developer describes the process as taking a touch, and while I would treat any claim of that kind as marketing rather than a specification, the underlying point stands: the invoice lives in the same place as the estimate that preceded it, so you are not retyping client details.

The part I find most interesting is the payment side. Clients can settle an invoice directly through the app rather than being sent off to a bank transfer or a check in the mail. For a cleaning business, where jobs are often small and frequent, shortening that gap between finished work and money received is the difference between a healthy month and a tight one. Nothing here replaces the work of chasing a late payer, but it removes one excuse from the conversation.

Contracts attached to every invoice

Each invoice comes with an accompanying cleaning contract, which is an unusual pairing and, to my mind, the most distinctive thing about the app. In this trade, scope creep is a constant risk: a client adds a room, asks for the oven as well, and suddenly the job is bigger than the price agreed. Having the terms travel with the bill keeps the agreement visible at the moment money changes hands.

On top of that, the app includes contract templates you can download and adapt to your own requirements. That gives you a starting point without hiring someone to draft paperwork from scratch, and it leaves room to adjust the wording for how you actually work. I would expect this to appeal most to someone who has been running jobs on handshake agreements and wants something more formal without a legal bill.

It is worth being clear about what templates are: a starting point, not a substitute for advice when a contract matters a great deal. The app gives you the document and the flexibility to edit it.

The video library and what it covers

The other supporting feature is a curated video library. The developer says it covers opening and registering a cleaning service, hands-on cleaning tutorials and rundowns of equipment. That is a wider remit than the paperwork tools, and it suggests the app is trying to serve someone at the beginning of the journey as well as someone already booked solid.

The registration material would be the draw for anyone still working out how to set up legally and administratively. The cleaning tutorials and equipment guides are more about doing the work well and choosing what to buy. I would not expect a video library to replace experience, but as a reference shelf inside the same app you use for invoicing, it is a reasonable addition rather than filler.

For a new operator, having the business side and the craft side in one place lowers the number of separate things to figure out. For an established cleaner, the tutorials are likely to be the least-used part of the app, and the estimates, invoices and contracts the most.

What it asks of you

Thunder Pro is free to download and shows no ads, which is a point in its favor for a tool you might open in front of a client. It does offer in-app purchases, so the free download is not the whole story.

The practical requirements are the ones you would expect from a business app of this type. You need clients to invoice, and you need to be willing to move your quoting and billing into a single system rather than keeping it in your head or in a notebook. If your customers strongly prefer another method, the payment feature does less work for you.

The rating sits at 2.6 from 56 ratings, with 30 written reviews. That is a modest score for an app that has been updated as recently as October 2, 2026, and it is the kind of number I would want to understand before relying on the app for money coming in. It does not tell you what any individual user ran into, but it is low enough to justify reading a few reviews before you move your invoicing across.

Getting the most from it

The sensible way in is to start with the part that saves you the most time. If quoting is your bottleneck, build your first estimate for a job you already have and see how the recurring and one-time versions compare. If billing is the chore, send one invoice and let a client pay it before you move everything over.

Set up your contract template early. The app lets you download and customize templates, and doing that once, properly, means every invoice afterward carries terms you are happy with. Adjusting it job by job defeats the purpose.

Then treat the video library as background rather than a task. The registration and setup material is most useful before you are busy, and the tutorials and equipment guides are worth dipping into when you are deciding what to buy or how to handle a surface you have not worked with. None of it demands a schedule.

Keep an eye on what the in-app purchases cover as you go.

A fit for small cleaning operations

Thunder Pro is a focused tool, and that focus is its main argument. It is built for cleaning businesses, and it handles the specific paperwork of that trade: estimates for one-time and recurring work, invoices, client payment, and contracts that travel with the bill. The video library rounds it out for people still learning the business.

If your operation is larger, or if your clients pay in ways that keep them outside the app, the payment feature will do less for you, though the estimating and contract side still stands on its own.

The low rating is the thing I would weigh most carefully. It is free to try, with purchases available, so the cost of finding out whether it fits your workflow is low. My advice is to test it on a single job before making it the system you depend on.