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About

EternalEngineOS combines five business functions — CRM, invoicing, payments, booking, and email — in one app for solo founders and small service businesses. The one-person business back office: CRM, invoicing, payments, booking and email. Manage clients and contacts, send invoices and estimates, take payments, schedule bookings on your calendar, and send email — all in one place, without juggling five separate subscriptions. EternalEngineOS replaces the patchwork of separate CRM, invoicing, payment, booking and email tools with one simple app designed for one-person businesses. Free tier: $0, no credit card required. Basic: $9.95/mo flat with a 30-day no-card trial. Team $49/mo, Pro $99/mo, Business $199/mo. Built for solo founders and small businesses of every kind. Start free, no card. Basic is $9.95/mo when you're ready. Launched 3 months ago and in beta.

About

Fronira is a web-based customer payment portal for businesses that manage invoices in QuickBooks Online. It gives customers a branded place to review outstanding invoices and balances, download invoice copies, and submit payments online. The portal connects QuickBooks Online with Stripe for payment processing, and payment activity is synchronized with QuickBooks. Businesses can offer card and ACH payment options, configure a card surcharge or ACH discount, and customize the customer-facing experience. Paid plans can remove Fronira branding and use a custom domain; the Business plan includes API access and custom integrations. The service is aimed at small businesses and service providers seeking a client-facing way to collect invoice payments through their existing QuickBooks workflow. Fronira offers a free plan as well as paid plans; Stripe processing fees apply separately.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Service businesses and small businesses

Audience

Small businesses that invoice in QuickBooks Online: trades and service businesses, consultants, and bookkeeping firms.

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

Screenshots and Videos

Pricing

$9.95/month
Free $0 (no card, not a trial). Basic $9.95/mo flat, with a 30-day no-card trial. Team $49/mo. Pro $99/mo. Business $199/mo.
Free Version Supported
Free Trial Supported

Pricing

$0/month
Free plan: $0/month with unlimited clients, invoices, and payments. Pro: $125/month; removes Fronira branding and includes a custom domain. Business: custom pricing with API access and custom integrations. Stripe processing fees apply separately.
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

EternalEngine
Founded: 2026
United States
eternalengineos.io/basic/

Company Information

Fronira
United States
fronira.com

Alternatives

Alternatives

PaymentCollect for QuickBooks

PaymentCollect for QuickBooks

Payment Collect
5.0 out of 5 stars
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NPSONE Smart Invoicing

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QuickBooks Payments

Intuit
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Atlas Solo

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SaturnShift

SaturnShift

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Categories

Categories

Payment Processing Supported

Business Management Features

Billing & Invoicing Supported
CRM Supported
Employee Management Not Supported
Financial Management Supported
Inventory Management Not Supported
Marketing Management Supported
Order Management Not Supported
Point of Sale (POS) Not Supported
Project Management Not Supported
Purchasing Not Supported
Scheduling Supported
Time & Expense Tracking Not Supported
Training Management Not Supported
Vendor Management Not Supported

Integrations

QuickBooks Online Not Supported
Stripe Not Supported

Integrations

QuickBooks Online Supported
Stripe Supported
Claim EternalEngine and update features and information
Claim EternalEngine and update features and information
Claim Fronira and update features and information
Claim Fronira and update features and information