ExtraBrain vs SpellBox

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

ExtraBrain compared with SpellBox
Detail	ExtraBrain	SpellBox
What it does	Local-first AI interview and meeting copilot for Mac	AI programming assistant that generates code from simple prompts
Stage	Startup	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Paid
Pricing	Free core app with local Gemma 4, local Parakeet transcription, and bring-your-own provider setup. Pro: $9.99/month, $99/year, or $179 Lifetime. Eligible monthly and yearly Pro subscriptions include 1,000 ExtraBrain AI credits per billing month. External AI and transcription provider usage billed se	SpellBox one-year license: $40 early bird price (regular $65). Includes unlimited code generation, unlimited computers, and code bookmarking. Additional 15% off available with promo code EARLYBIRD15. 5-day money-back guarantee.
Key features	Live transcription with local Parakeet or optional Deepgram Screen-aware context and screenshots for structured answers Hidden from screen sharing on Zoom, Google Meet, Teams, and coding platforms Post-session summaries and organized context Local-first data storage on your Mac Support for multiple interview and meeting platforms Desktop app that does not join calls as a bot	Code generation from natural language prompts Code explanation feature for understanding existing code VS Code extension integration Support for major programming languages Desktop applications for macOS and Windows
What makes it different	Fully local workflow possible with on-device Gemma and local Parakeet transcription Free to start with optional Pro, unlike bundled subscription services Built around bring-your-own provider access instead of locked-in vendors Designed to stay invisible during screen sharing and recordings	Instant solutions to coding problems without searching the internet Helps developers focus on high-quality software rather than routine coding tasks Reduces time wasted on syntax errors and debugging
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)	17 no change since last check	38 no change since last check
Trust Flow (Majestic)	7	7
Citation Flow (Majestic)	25	36
Referring domains (Majestic)	49	438

5 details filled in for both companies.

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