Veloquo

Overview

Veloquo turns English videos stored on iPhone or iPad into a learning experience. Built on Apple's Speech, Translation, and Foundation Models frameworks, it provides dual subtitles, single-sentence loop playback, and tap-to-look-up dictionary entirely on-device. Videos never leave the device; only lightweight data such as subtitles and vocabulary is synced to the cloud.

The problem

Plenty of learners want to study with English videos, but cloud-based subtitle generation feels slow and raises privacy questions. The basics learners actually need — repeating one sentence, looking up a word in place — are missing from most video apps.

Key features

• On-device English subtitles paired with Japanese translation
• Streaming generation keeps subtitles in step with playback
• Single-sentence loop for repeated practice
• Tap a word in the subtitle to look it up in place
• Playback controls tuned for studying — 0.5–2× speed, 10s skip

Tech stack

Architecture

Built with SwiftUI and MVVM. Subtitles use the Speech framework, translation uses the Translation framework, and sentence-level explanations use Foundation Models. Videos and their intermediate data never leave the device; only lightweight data — subscription state, learning history — is stored in the cloud.

How AI is used

Apple Intelligence's Foundation Models power sentence-level explanations, summaries, and SVOC breakdowns. Skipping a cloud LLM keeps both inference cost and privacy risk low.

Evaluation & Operations

Released on the App Store with a three-tier model — Free, Basic, Pro. We watch usage logs for loop frequency and perceived subtitle latency, then iterate on subtitle responsiveness and dictionary accuracy.