COMPARE · CHECKED OCTOBER 19, 2026
Invoice Fly vs Peak
Invoice Fly is a simple phone app for quick invoices and estimates, with alerts when customers open or pay. Peak gives you invoices free, tied to the lead, the signed estimate and the job.
TL;DR
Pick Invoice Fly if you only need quick invoices from your phone. Pick Peak if you want invoices tied to the estimate, the job and the customer, free.
Sign-up opens soon. The demo is open now, with made-up data, no sign-up needed.
SIDE BY SIDE
Invoice Fly and Peak, row by row.
What Invoice Fly's own pages said on October 19, 2026, next to what Peak does today.
| Invoice Fly | Peak |
|---|---|
| What it covers | |
| Invoices and estimates from your phone, with payment links, expense tracking and reports. | Leads and customers, estimates with e-sign and change orders, invoices, projects, crews, a dispatch board, a time clock, job photos and daily logs, plus Sherpa. |
| Pricing model | |
| $8.99 a week or $98.99 a year on its website and the US App Store. Other plans vary by App Store country. | The software is free. No per-user fee and no contract. You pay your own texting, email, AI and payment providers directly. |
| AI | |
| An AI logo maker. We didn't find other AI features on its site. | Sherpa looks things up and makes changes in every Peak tool, from chat or from your own AI assistant. Anything that reaches a customer or moves money waits for your OK. It runs on your own AI key. |
| Phone app | |
| iPhone and Android apps in the app stores. | Installs from your phone's browser to your home screen. The crew app works offline. No App Store or Google Play app yet. |
| Your data | |
| Invoices can be exported and downloaded any time. We didn't find a client-list export, a public API or an AI connector. | When sign-up opens, your customer data lives in a database you own, not ours. Export contacts as a spreadsheet or download the whole database any time. |
| Getting started | |
| Download the app and start on your own. No card needed to start. | Sign in and start. Bring contacts and your price book over from spreadsheets. Texting, email, AI and payments start when you connect your own accounts, or we connect them for you (Get set up, $997 one-time). |
WHAT IT COSTS
Their published price, and ours.
Invoice Fly
- Weekly: $8.99
- Yearly: $98.99
From invoicefly.com and the US App Store. Both plans have the same features. Other plans and prices vary by App Store country. No card needed to start.
From invoicefly.com, checked October 19, 2026. Prices change, so confirm on their site.
Peak tools
$0
Free when sign-up opens (soon). You bring your own accounts for AI, texting, email and payments. Today the tools come with every Peak service plan.
Want our team to run your marketing or lead follow-up? That's a paid service, and the tools come with it. See service pricing.
WHERE INVOICE FLY IS STRONG
Credit where it's due.
- Fast invoices and estimates from a phone, with estimates that convert to invoices
- Alerts when a customer opens an invoice, pays, signs an estimate or goes past due
- Free calculators and invoice templates on its website
- An AI logo maker inside the app
WHERE INVOICE FLY IS AHEAD
What Peak doesn't do yet.
If one of these is a must-have, take it seriously.
- iPhone and Android apps in the app stores
- Instant phone alerts when an invoice is opened, paid or past due
- Downloadable invoice templates and an AI logo maker
Everything not in the Peak tools yet
- iPhone and Android apps in the app stores (the tools install from your phone's browser today)
- QuickBooks and Xero sync
- Full job costing, estimate vs actual on every line
- Payroll
- A built-in AI phone receptionist
- AI takeoff from plans
WHERE PEAK IS DIFFERENT
What you get with Peak that Invoice Fly doesn't do.
- The Peak tools are free. Invoice Fly is $8.99 a week or $98.99 a year on its website.
- Peak's invoices come with leads, e-signed estimates, change orders and jobs in the same tools.
- Card and bank payments run on your own Stripe account.
- Anything Sherpa would send to a customer, like an invoice, waits for your approval.
The software is free
No per-user fee and no contract for the tools. You bring your own accounts for AI, texting, email and payments, and pay those companies directly at their prices. We don't mark them up.
Your data, your accounts
When sign-up opens, your customer data lives in a database you own, not ours. Export it any time. If you leave, you take everything with you.
Sherpa does the work, inside rules
Tell Sherpa "add a note to Susan Park: gate goes on the north side." It finds her and adds it, or asks you to reply YES first when the rules say so. Anything that reaches a customer or moves money waits for your approval. You can see every rule, and you can only make them stricter.
A team if you want one
You can run the tools on your own. If you'd rather have help, our team runs the marketing, lead follow-up and AI setup for you on a paid plan.
Read every Sherpa rule on what Sherpa will and won't do.
SWITCHING
Moving from Invoice Fly to Peak.
Most of it is two spreadsheets. Run both side by side for a week if you like.
Step 1
Export from Invoice Fly
Invoice Fly lets you download and export your invoices any time. We didn't find a self-serve export for your client list in its public pages, so ask Invoice Fly support for one.
Step 2
Import your customers
In Peak, open Contacts and choose Import. Upload the spreadsheet and match the columns. Rows with the same email or phone merge instead of making duplicates.
Step 3
Bring your price book
The Estimator imports your items and prices from a spreadsheet. There's a template to fill in if your old export doesn't line up.
Step 4
Connect your own accounts
Hook up your texting number, email, AI key and Stripe when you're ready to send and get paid. Nothing goes out until you do.
Step 5
Finish open jobs, then switch
Let jobs already in progress finish where they are, and start new ones in Peak. Rather not do the move yourself? Our team can help.
WHAT YOU SET UP
What works the day you sign in.
The tools are free. Texting, email, AI and payments run on accounts you own, so you pay those companies directly.
Works when you sign in
- Customers, deals, notes and tasks
- Estimates with options, change orders and invoices, shared by link
- Projects, phases, crew schedules, photos and daily logs
- A customer page for each job
Needs your own account
- Texting
- Two-way texts, missed-call text-back, text review requests and texting Sherpa. Connect your own texting account (such as Twilio), with your number registered with the carriers. Nothing sends or charges until you do.
- Sending estimates, invoices and messages by email. Connect your own email sending account. Nothing sends or charges until you do.
- AI
- Sherpa and AI drafts. Connect your own AI key (Anthropic, OpenAI, Google or a compatible provider). Nothing sends or charges until you do.
- Payments
- Card and bank payments on invoices. Connect your own Stripe account. Nothing sends or charges until you do.
Rather not do it yourself? Get set up: we connect all four and import your contacts and price book, $997 one-time.
Pick Invoice Fly if
You only need quick invoices from your phone.
Pick Peak if
You want invoices tied to the estimate, the job and the customer, free.
INVOICE FLY VS PEAK
Common questions.
Yes. Peak invoices, estimates and e-signatures are free when sign-up opens. Card and bank payments run on your own Stripe account at Stripe's rates. Invoice Fly was $8.99 a week or $98.99 a year on its website when we checked on October 19, 2026.
Yes. Peak shows you when a customer opens an estimate. Invoice Fly also sends phone alerts when an invoice is opened, paid or past due.
You can download your invoices from Invoice Fly any time. We didn't find a client-list export in its public pages, so ask its support for a spreadsheet. Then import it in Peak's Contacts.
Not in the App Store yet. Peak installs from your phone's browser to your home screen, and the crew app works offline. Invoice Fly has iPhone and Android apps in the stores.
MORE ESTIMATE AND INVOICE APPS
Sources for this page (6)
- Weekly and yearly prices, AI logo maker, no card to start: www.invoicefly.com (read October 19, 2026)
- US App Store prices and iPhone app: apps.apple.com/us/app/invoice-maker-invoice-fly/id1606911248 (read October 19, 2026)
- Android app: play.google.com/store/apps/details?id=io.labhouse.invoicesapp (read October 19, 2026)
- Invoice export and download: invoicefly.com/product/download-export-invoices/ (read October 19, 2026)
- Opened, paid, signed and past-due alerts: invoicefly.com/product/payment-status-notifications/ (read October 16, 2026)
- Estimate to invoice, expenses, reports, website templates and calculators: www.invoicefly.com (read October 16, 2026)
How we checked: we read Invoice Fly's public pages, pricing and help center on October 19, 2026, without signing up or logging in. Invoice Fly is a trademark of its owner, used here only to identify the product. Peak Engine isn't affiliated with or endorsed by Invoice Fly. Spot a mistake? Email hello@peak-engine.com and we'll fix it.
Try Peak next to Invoice Fly.
Leads, estimates, invoices, jobs and photos, with Sherpa doing the office work.
Sign-up opens soon. The demo is open now, with made-up data, no sign-up needed.