Plain vs HelpStack

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

Plain compared with HelpStack
Detail	Plain	HelpStack
What it does	AI support infrastructure for B2B teams built composable and API-first	AI-powered shared inbox for unified customer support across email, chat, and social channels
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	SI
Pricing model	Paid	Freemium
Pricing	Foundation plan $45/user/month billed annually with 1,000 credits/month; Horizon plan $99/user/month billed annually with 2,500 credits/month; Frontier plan with custom pricing for larger organizations. 7-day free trial available with no credit card required.	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.
Key features	Ari AI agent for customer interactions Sidekick internal AI assistant Unified inbox for Slack, Teams, Discord, and email Workflow automation and auto-routing Insights for trend detection and analytics API-first architecture and GraphQL Help Center and knowledge base Lookup codebase integration powered by Cursor	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
What makes it different	Composable, API-first infrastructure allows building anything no-code or all-code Multiple AI agents orchestrated together with human control Designed and stress-tested by fast-growing teams Enterprise-level security built for everyone	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
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)	73 +1 (up) since last check	5 −2 (down) since last check
Trust Flow (Majestic)	29	10
Citation Flow (Majestic)	51	24
Referring domains (Majestic)	3033	83

5 details filled in for both companies.

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