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SheetXL vs heysteff SDK

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

SheetXL compared with heysteff SDK
DetailSheetXL logo SheetXLheysteff SDK logo heysteff SDK
What it doesThe API-first spreadsheet platform for developers and teams who want Excel power, embedded in their own stack Official TypeScript SDK for sending messages, managing files and templates, with retries and webhook verification
StageStartup Not given
Founded2024 Not given
Based inNot given Not given
Pricing modelFreemium Not given
PricingCommunity: Free for non-commercial use. Commercial: $745/dev/year for commercial use. Application Bundle: $4,495/app/year to deploy in one commercial application with 10 developer licenses. Start-ups and small businesses with fewer than 10 employees and less than USD 1M in funding or annual revenue Not given
Key features
  • 400+ Excel functions and formulas
  • One-line API integration
  • Instant autofill with 0.7s performance for 1M rows
  • Realtime scripting for custom functions
  • 100% client-side execution
  • Seamless Excel import and copy-paste
  • 375+ shortcuts and UI gestures
  • MIT licensed with no vendor lock-in
  • Send messages across WhatsApp Cloud and other channels
  • Upload and manage media files
  • Template support with parameters
  • Automatic retries with exponential backoff
  • Webhook signature verification
  • Pagination with cursor support
  • Detailed error handling with fix suggestions
  • No dependencies, uses native Fetch API
  • Access to all heysteff API endpoints
What makes it different
  • Combines spreadsheet power with embeddability and developer API
  • Runs entirely client-side with no server dependencies
  • Exceptionally fast performance even on older devices
  • Open source MIT license with full extension capability
  • Add custom functions without build steps or reloads
  • Works across Node 20+, Deno, Bun and Cloudflare Workers with no dependencies
  • Built-in idempotency prevents duplicate messages and payments across system restarts
  • Automatic retry logic with growing delays and Retry-After header support
  • Webhook verification with timestamp validation
  • Full TypeScript types for API integration
Community votes00
DR (Domain Rating by Ahrefs)Not checked yet no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)00
Citation Flow (Majestic)150
Referring domains (Majestic)60

3 details filled in for both companies.

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