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Related Products
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EternalEngine:
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.
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Sesly:
About
Sesly is a cloud-based client management and booking tool for solo coaches and tutors, particularly those with about 5 to 30 ongoing clients. It keeps client notes, packages, session history, and payment status together, and provides a booking link for one-to-one sessions and small groups. Coaches can schedule recurring sessions, send automatic email reminders with calendar attachments, and import client lists from CSV files. Sesly can also send payment reminders, while clients pay coaches directly; the platform does not process payments. Users can export their data in one click. The service is intended for individual practitioners rather than teams, and it does not provide course delivery or built-in card payments. A 14-day free trial is available without a payment card, followed by a $17 monthly subscription.
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EternalEngine:
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
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Sesly:
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
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EternalEngine:
Audience
Service businesses and small businesses
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Sesly:
Audience
Solo coaches and tutors.
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EternalEngine:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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Sesly:
Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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EternalEngine:
API
Offers API
Not Supported
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Sesly:
API
Offers API
Not Supported
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EternalEngine:
Screenshots and Videos |
Sesly:
Screenshots and VideosNo images available
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EternalEngine:
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
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Sesly:
Pricing
$17/month
A 14-day free trial is available without a payment card. The subscription is $17 per month after the trial.
Free Version
Not Supported
Free Trial
Supported
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EternalEngine:
Reviews/
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Sesly:
Reviews/
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EternalEngine:
Training
Documentation
Not Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Sesly:
Training
Documentation
Not Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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EternalEngine:
Company InformationEternalEngine
Founded: 2026
United States
eternalengineos.io/basic/
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Sesly:
Company InformationSesly
Ukraine
www.sesly.pro/
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EternalEngine:
Alternatives |
Sesly:
Alternatives |
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EternalEngine:
Categories |
Sesly:
Categories |
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EternalEngine:
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
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EternalEngine:
Integrations
No info available.
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Sesly:
Integrations
No info available.
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EternalEngine:
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Sesly:
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