AI/LLM • Mobile App • 0→1
HyperNest Labs built ToneCheck from concept to App Store—an AI tool that checks grammar, spelling, and tone without rewriting your voice.
10 weeks
Build time
iOS
Platform
3
AI features
Freemium
Pricing
Week 1-2
Product design, AI model selection, and iOS architecture.
Week 3-5
Core grammar and spelling check with AI tone analysis.
Week 6-8
Custom iOS keyboard, auto-fix suggestions, and app integrations.
Week 9-10
Pro subscription setup, App Store optimization, and launch.
A quick operator-level summary of what changed.
Problem
Grammar tools rewrite messages into robotic corporate-speak, losing the user's authentic voice.
Action
HyperNest built an AI-powered iOS app with custom keyboard that flags grammar, spelling, and tone issues without rewriting—preserving the user's voice.
Outcome
ToneCheck launched on the App Store in 10 weeks with freemium pricing, privacy-first design, and a unique 'fix without rewriting' approach.
The founder was frustrated with grammar tools that rewrite messages into corporate-speak. They wanted a tool that catches real issues while preserving the user's authentic voice.
Our team built ToneCheck combining AI for tone analysis with traditional NLP for grammar and spelling, wrapped in a beautiful iOS app with a custom keyboard.
ToneCheck launched on the App Store offering a unique value proposition: grammar checking that doesn't change who you are.
Tools, platforms, and competencies we owned for this engagement.
Mobile
AI/ML
Backend
“HyperNest built exactly what I envisioned—an AI grammar tool that helps without overstepping. The custom keyboard works flawlessly across all my apps.”
ToneCheck Founder
Founder
We'll replicate the playbook and customize it to your goals.