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Scell.io vs Sellsy
Sellsy's CRM+invoicing vs Scell.io's pure e-invoicing API
Sellsy is a French SaaS suite combining CRM, invoicing, sales management, and treasury, with a documented REST API v2 (OAuth 2.0). The API is rich but designed primarily for outbound integrations (Zapier, accounting). Sellsy mainly targets SMBs directly via subscription. Scell.io offers no CRM or sales management; in exchange, Scell.io provides native SDKs (PHP, JS, MCP), pay-as-you-go pricing per invoice, and a multi-tenant architecture designed for IT services companies and SaaS publishers wanting to embed Factur-X in their own product.
Key facts
- Sellsy: CRM + invoicing + treasury all-in-one, OAuth2 API
- Scell.io: pure e-invoicing/signature API, no CRM
- Sellsy SDKs: no official SDK (OpenAPI only)
- Scell.io SDKs: official PHP, TypeScript, MCP, Postman
- Sellsy: multi-user but not API-level multi-tenant
- Scell.io: sub-tenants per end client, white-label friendly
Code example
// Scell.io — création facture B2B avec SDK PHP
use Scell\Sdk\Client;
$scell = new Client(['api_key' => getenv('SCELL_SK')]);
$invoice = $scell->invoices()->builder()
->facturX()
->seller('12345678901234', 'Ma SAS', $sellerAddr)
->buyer('98765432109876', 'Client SARL', $buyerAddr)
->addLine('Prestation', 1, 1000.00, 20.0)
->create();