Top 10 Features to Build Next
Across all 5 TK apps — prioritized by user impact, business value, and technical feasibility. Free-first strategy: build the best free tier, then add premium for power users.
SafeVault
Password Manager
ScanLens
Document Scanner
TK-Tax
Tax Declaration
SpeakForge
Language Learning
TK-Organizer
File Manager
Spaced Repetition System (SRS) + Gamification
Implement Anki-style spaced repetition for vocabulary review with streaks, XP points, daily goals, and leaderboards. This is the #1 feature that makes language apps sticky — Duolingo's entire retention model is built on this.
Impact
10/10
Browser Extension + Autofill
Build a Chrome/Firefox extension that auto-detects login forms, suggests saved credentials, and captures new passwords on signup. Without this, users must copy-paste from the app — a dealbreaker vs Bitwarden/1Password.
Impact
10/10
Smart Receipt OCR + Auto-Categorization
Scan receipts with camera, auto-extract amount/date/vendor via Tesseract OCR, then AI-categorize into tax deduction categories (Werbungskosten, Sonderausgaben, etc.). WISO and Taxfix charge 30-40 EUR for this — we offer it free.
Impact
9/10
Batch Scan + Multi-Page PDF Export
Scan multiple pages in sequence, auto-crop/enhance, then export as a single searchable PDF with OCR text layer. Essential for contracts, receipts, and official documents. Adobe Scan charges $10/mo for this.
Impact
9/10
Smart Duplicate Detection + Storage Cleanup
Auto-detect duplicate files by content hash (not just name), show side-by-side comparison, and suggest safe deletions. Users can reclaim GB of storage instantly. Google Files does this — it's their #1 feature.
Impact
8/10
Password Breach Detection (Have I Been Pwned)
Check saved passwords against the HIBP API (k-anonymity, free). Alert users when their credentials appear in breaches. Bitwarden offers this in their free tier — it's a trust-building feature that drives adoption.
Impact
8/10
AI Conversation Practice with Speech Recognition
Voice-based AI chat partner using Web Speech API for pronunciation feedback. Practice real conversations with AI (ordering food, asking directions, job interview). Babbel charges $14/mo for this — we do it client-side for free.
Impact
8/10
ELSTER Direct Submit Integration
Generate ELSTER-compatible XML and submit directly via the ERiC API. Users complete their tax declaration entirely offline, then submit with one click. This is the missing final step — without it, users still need another app to actually file.
Impact
8/10
Real-Time Camera Translation (AR Overlay)
Point camera at foreign text, see translation overlaid in real-time (like Google Lens). Uses continuous OCR + local translation model. A viral feature that drives organic sharing — "look what this app can do!"
Impact
7/10
TK-Bridge: Cross-Device Sync via WebSocket Relay
Sync data between phone/tablet/desktop without cloud accounts. QR code pairing, end-to-end encrypted, works across all 5 apps. This is the "ecosystem glue" that makes users stick with TK apps over competitors.
Impact
7/10
Business Strategy: Free-First Flywheel
Phase 1: Free Tier Excellence
Make the free version genuinely better than competitors' paid versions. Offline-first PWAs = zero server costs. Build user base through quality, not marketing spend.
Phase 2: Network Effects
Add sharing features, leaderboards (SpeakForge), family vaults (SafeVault), team workspaces. Each user brings 2-3 more. TK-Bridge connects all apps into one ecosystem.
Phase 3: Premium Monetization
Pro tiers at $3-5/mo per app or $9.99/mo for TK-All bundle. Target: 5% conversion rate. 10K free users = 500 paid = $5K/mo MRR. Enterprise: self-hosted, SSO, audit logs.