Kartoffel vs Silent Proof

Voice Echo is an app designed to improve your language speaking skill. It simply echo back your voice to help you to shape your accent more close to native speakers.

Prove your focus with verifiable proof. Silent Proof is the first app that creates tamper-evident proof of your phone non-usage during focus sessions. Whether you’re studying, working, or in a digital detox, you can show others—or yourself—that you stayed off your phone. How it works Create a focus session, lock your screen within 10 seconds, and keep it locked until the session ends. Silent Proof monitors your screen lock state and app usage in real time. When you’re done, you get a verifiable proof report with cryptographic hashing and device binding—so it can’t be faked. Verifiable proof Tamper-evident reports with SHA-256 cryptographic hashing Device-specific binding for authenticity Export as shareable PNG cards or detailed PDF reports (Pro) Full session metadata, including any violations and timestamps Analytics and insights Track daily and weekly silent minutes View your longest clean session streak Heatmap of your focus patterns over time Dashboard, Activity, and Insights tabs for a clear overview Smart violation detection The app records screen unlocks, app switches, and service interruptions during a session. Every violation is timestamped so your proof reflects exactly what happened. Privacy-first All data stays on your device. No cloud sync, no external servers. Your focus data is stored locally and protected by cryptographic hashing. Free and Pro Free: 3 focus sessions per day, PNG export Pro: Unlimited sessions and PDF export Note: Silent Proof monitors your phone usage to generate proof. It does not block apps or restrict access—it only records activity to create verifiable proof of focus time.