Field Service Apps Under $20 a Month (That Actually Work)
ShowTheReceipts fits comfortably under a $20/month budget at $15/mo, with full invoicing, scheduling, and on-site payments included — no add-ons required to get the whole quote-to-paid loop working for a solo operator. Free tiers exist elsewhere, but they're usually invoicing-only or capped by job count, which stops covering you the moment the business grows past a trickle of work.
How we picked
Every price here is the vendor's published entry plan in 2026, monthly billing, one user. We only included tools where the under-$20 plan is actually usable for running jobs — not teaser tiers that gate invoicing or scheduling behind an upgrade. ShowTheReceipts is our own product and we've said plainly where the cheaper free options beat it.
| Software | Starting price | Best for |
|---|---|---|
| ShowTheReceipts That's us | $15/mo | Solo operators: quoting, scheduling, invoicing, on-site card, cash & Venmo tracked, tax-ready books |
| Kickserv Flex | $19/mo | Basic scheduling + customer management on a budget |
| FieldVibe | Free / $20/mo Solo Pro | Simple job scheduling with text reminders |
| ServiceM8 | Free (30 jobs/mo) | Very low volume — under 30 jobs a month |
| Wave | Free | Invoicing only — no jobs, no scheduling |
Why the under-$20 list is so short
Field service software is priced for crews — dispatch, GPS tracking, and team permissions justify $59/month when five techs bill through it. A solo operator pays for that coordination layer and never opens it. The tools below are the exceptions: sized (and priced) for one person.
1. ShowTheReceipts — $15/mo
The full stack at the lowest paid price. Quoting, scheduling, invoicing, card payment on-site, cash and Venmo tracked in the same ledger, a job-request intake page, and one-click tax-ready exports at year end. Setup is a photo: shoot your existing flyer or price list and the service catalog builds itself. Move up to Pro when you want automatic late-payment reminders running on their own.
The trade-off: no dispatch board, no fleet GPS. If you need those, you need the $39+ tier of this market anyway.
2. Kickserv Flex — $19/mo
The established budget pick. Usable scheduling, customer management, and invoicing from a company that’s been at this a long time. The interface shows its age, but it works.
The trade-off: thinner on payments and automation — reminders and on-site charging are where it feels its price.
3. FieldVibe — free, or $20/mo Solo Pro
The scheduling-first option. Clean mobile scheduling with “on my way” texts. The free tier is real (unlimited jobs, one device, manual texts); Solo Pro adds automated messages and multiple devices.
The trade-off: it’s a scheduler with light extras, not a billing system — invoicing and getting paid are not its center.
4. ServiceM8 — free up to 30 jobs/mo
The best genuinely-free plan. Thirty jobs a month free, and card payments taken through the app earn bonus job credits. Well built, iOS-centric.
The trade-off: the cap. At a job a day you’ve outgrown it, and the paid plans put you back in normal-price territory. Android support is limited.
5. Wave — free
Free forever, but it’s not field service software. Solid invoicing and accounting with no job tracking, no scheduling, and no customer-facing booking. Fine as a starting point; the admin gap it leaves is the reason this category exists.
The honest bottom line
Under $20, you’re choosing what to live without. Wave and ServiceM8 cost nothing and cap you; Kickserv and FieldVibe each cover part of the job. ShowTheReceipts at $15 is the only one on the list built to cover the whole solo workflow — which is exactly the claim you should double-check against the table above.
Frequently asked questions
Is there any good field service software under $20 a month?
Yes — ShowTheReceipts is the full option at $15/month: invoicing, scheduling, and on-site card payments in one place. Most of the rest of the category starts at $39–$59/month, which is priced for crews rather than a single operator.
What's the catch with free field service apps?
A cap you'll outgrow. Free tiers in this category are typically capped by job volume or locked to a single device, which is fine for testing the waters but not for running the business day to day. ShowTheReceipts skips the cap at $15/month rather than making you graduate off a free plan mid-growth.
Why is most field service software so expensive?
Because it's priced for crews. Dispatch boards, GPS fleet tracking, and team permissions are expensive to build and worth $59+/month to a business with five techs. A solo operator pays the same price and uses a fraction of it.