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ChatGPT vs Hemelion

Two fact sheets from our own research, side by side — pricing, platforms, API access and status re-checked by us rather than quoted from the vendors. ChatGPT starts at $8, Hemelion at $9.90. Only ChatGPT has a free tier. Only ChatGPT ships a public API.

ChatGPTGeneral assistant with tools, memory, files and voiceHemelionSells a one-time structured report that compares 2-3 options or maps recurring decision patterns.

Side by side

FactChatGPTHemelion
CategoryGeneral-purpose AI ChatbotsPersonal AI Assistants
Pricing modelFreemiumPaid
Starts at$8 month$9.90 one_time
Public APIYesNo
PlatformsWeb, iOS, Android, macOS, Windows, APIWeb
CompanyOpenAIHemelion
Launched2022—
Last verifiedSep 6, 2026Sep 1, 2026

What our research says

ChatGPT

ChatGPT is the default general assistant and the one everyone else is measured against, but the tier you need is rarely the one you first buy. Free is now ad-supported, and the jump to genuinely unlimited reasoning is steep.

Pros

  • Broadest tool surface of any consumer assistant: browsing, code, images, voice, connectors
  • The $8 Go tier closed the gap between free and a $20 commitment
  • Apps on every desktop and mobile platform, not just a web wrapper
  • Model quality is consistently at or near the front of the field

Cons

  • Advertising now appears on the free and Go tiers
  • Message and reasoning limits are opaque and change without notice
  • Tier structure has churned repeatedly, so any price you quote ages fast
  • The API is a separate purchase, which surprises buyers who assume Plus includes it

Hemelion

Hemelion's angle is unusually specific for the category: instead of open-ended chat, it sells a single structured report meant to be checked against a small real-world experiment, which suits someone stuck on a concrete choice more than someone wanting ongoing coaching. At $9.90 per report with no subscription trap, the risk of trying it is low, but there's also no way to know report quality without buying one first beyond the free preview.

Pros

  • one-time $9.90 price with no subscription commitment
  • free preview available before paying
  • outputs are framed as testable through real experiments, not just predictions
  • two distinct report types for different situations (single decision vs. recurring pattern)

Cons

  • higher Pro/Teams tiers require manual review rather than instant signup
  • no company name or headquarters disclosed
  • only two report formats, with no lighter free ongoing tool

Which one fits

Choose ChatGPT if you need

  • General knowledge work, drafting, analysis and code across one interface
  • Anyone who wants file, image, voice and browsing input without assembling tools
  • Teams that need admin controls and data-retention terms via Business or Enterprise
  • Light users who want more headroom than free without paying $20

Choose Hemelion if you need

  • someone comparing 2-3 concrete options and stuck between them
  • people who notice a decision pattern repeating and want it named
  • users who want a one-time report rather than a recurring subscription

More comparisons

All ChatGPT alternatives →Browse all General-purpose AI Chatbots →