HelpStack vs Sellio

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

HelpStack compared with Sellio
Detail	HelpStack	Sellio
What it does	AI-powered shared inbox for unified customer support across email, chat, and social channels	AI customer support in one shared inbox with live chat, WhatsApp, Instagram, Telegram, and email
Stage	Not given	Startup
Founded	Not given	2025
Based in	SI	MA
Pricing model	Freemium	Freemium
Pricing	Free plan: €0 forever with 500 tokens per month and up to 10 channels. Starter: €29 per month with 8,000 tokens per month. Growth: €79 per month with 30,000 tokens per month. Enterprise: Custom pricing with unlimited tokens. All prices exclude VAT.	Free plan with shared inbox and website chat, 2 seats, and 5 AI conversations included. Mini plan at $20/month with 5 seats and $5 included AI credits. Essentials at $95/month with 10 seats and $25 included AI credits. Plus at $295/month with 50+ seats and $75 included AI credits. Annual billing ava
Key features	Unified inbox for email, Facebook, Instagram, WhatsApp, and website chat AI reply suggestions that agents approve with one click Automatic translation across 40+ languages Real-time message synchronization Smart search across conversations Conversation threading and agent assignment Free chat widget for website AES-256 encryption and GDPR compliance Website crawling to train AI agent White-label option	Shared inbox for all customer conversations Live chat widget with one-line installation Multi-channel support: website chat, WhatsApp, Instagram, Telegram, email AI agents trained on your own knowledge base and docs Ticketing system for ongoing work Workflow automation builder Team assignment and routing rules Support analytics and CSAT ratings Desktop app for macOS with Windows coming soon Conversation history and context preservation across channels
What makes it different	Built by the team behind SpaceGuardian with reliability-first approach from satellite operations Permanent free plan with no credit card required EU-hosted data with 99.9% uptime SLA Less than 2 second AI reply time	All channels in one inbox instead of requiring separate tools AI agents trained on your own docs rather than generic responses Free plan forever with no time limits or card required Significantly cheaper pricing than Zendesk, Intercom and LiveChat Designed for simplicity with no complex enterprise software required
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	2 −3 (down) since last check	15 +1 (up) since last check
Trust Flow (Majestic)	10	5
Citation Flow (Majestic)	24	31
Referring domains (Majestic)	83	61

6 details filled in for both companies.

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