PromptShield vs Heard

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

PromptShield compared with Heard
Detail	PromptShield	Heard
What it does	Stop rewriting prompts. Get better AI answers.	The voice layer for coding agents
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	US
Pricing model	Freemium	Freemium
Pricing	Free: 3 successful optimizations per day, full optimizer quality, no credit card required. Pro: $7.99/month for unlimited successful prompt optimizations.	Free: $0/month (open source with local voices). Pro: $12/month or $144/year (managed voices and spoken recaps). Power: $24/month or $288/year (adds voice input and iPhone companion). Every download includes a free 14-day Power trial with no card required.
Key features	One-click prompt optimization across 7 AI chats Prompt Library and Optimization History Guard feature for sensitive information detection Local image text OCR checking Coach and Personalization Apply without sending functionality	Spoken updates from Claude Code and Codex Three listening modes: Co-pilot, Companion and Focus Spoken recaps of agent work Voice dictation with right Command key Hey Parrot voice assistant iPhone companion app for listening and replying Follow multiple agent sessions at once Open source engine with local voices Works with any terminal including iTerm2 and tmux Up to 2M characters of narration daily on Power plan
What makes it different	Same high-quality optimizer in both free and paid versions No credit card required for free plan Local data storage for library, history, and personalization Works within existing AI chat interfaces without leaving them Transparent about data handling and privacy	Works without watching your screen—lets you stay informed while focused on other tasks All code and transcripts stay on your Mac; nothing is used to train models Listen and respond to agents from your iPhone via companion app Open source engine available under Apache 2.0 license Supports multiple coding agents with one interface
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)	Not checked yet no change since last check	6 −1 (down) since last check
Trust Flow (Majestic)	9	3
Citation Flow (Majestic)	19	30
Referring domains (Majestic)	9	101

5 details filled in for both companies.

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