Promptotype vs SellTo.us

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

Promptotype compared with SellTo.us
Detail	Promptotype	SellTo.us
What it does	Platform for developing, testing, and monitoring structured LLM tasks	AI-simulated audience testing for startup ideas, apps, products and ads
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Freemium
Pricing	Free plan at $0/month includes advanced prompt engineering playground and test queries. Basic plan at $6/month adds prompt template library and collection testing. Professional plan at $10/month includes 60-day run history, fine-tuning, and 1 weekly scheduled run. Yearly pricing available with 2 mon	Idea Snapshot: Free (100 participants). Quick Check: $19 USD one-time (1,000 participants). Pick the Winner: $49 USD one-time (10,000 participants). Launch Plan: $149 USD one-time (100,000 participants).
Key features	Advanced prompt engineering playground Design prompt templates with extended playground Define test queries with expected result JSON schemas or values Test prompts across entire query collections Function calling support Run and test history tracking Schedule periodic automated tests Model fine-tuning from collections Team collaboration Prompt template and model library management	Test ideas on up to 100,000 AI-simulated participants Compare up to 5 versions and 5 images Results by city for launch planning Ad targeting guide with platform-specific instructions Customizable audience groups with up to 10 demographics Validation experiments and next-step checklist Detailed PDF reports with decision briefs Re-test improved versions on same simulated crowd Photo testing and image voting Free invite rewards: get free Quick Check when friends make first purchase
What makes it different	Structured approach to prompt engineering with JSON schema validation Test entire collections of queries simultaneously for production readiness Automatic expected result generation from model outputs Full function calling support in playground and testing	Structured AI testing unlike chatbots: fixed crowd of individual profiles for your audience, every one answers each version, results counted by code No subscription: one-time purchases that don't expire while account is open Free first test with 100 AI-simulated participants Results by audience group, not just aggregate numbers Complete transparency: every number labeled as simulated, methodology fully explained
Community votes	0	0
DR (Domain Rating by Ahrefs)	17 no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	3	1
Citation Flow (Majestic)	26	17
Referring domains (Majestic)	40	4

5 details filled in for both companies.

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