FilingExplorer
SEC Filing Research
Search and explore public SEC filings. Review institutional holdings reported on Form 13F, see which institutions report positions in a public company, and assemble hypothetical portfolios from reported holdings and ETF data for research and backtesting.
Keep up with public disclosures, including insider transaction filings, presidential executive actions, and corporate lobbying reports.
Built for AI-native workflows: a REST API and MCP server let AI assistants like Claude answer natural language questions grounded in source filings.
FilingExplorer provides data and research tools for informational purposes only. It does not provide investment, financial, legal, or tax advice, and nothing on it is a recommendation to buy, sell, or hold any security.
BetterPitch
Visual Ear Trainer
BetterPitch is a pitch recognition app for iPhone and iPad that helps musicians improve their intonation and pitch accuracy by using visual feedback.
It detects single-voice pitch in real-time and displays the accuracy relative to the nearest note over an audio spectrogram. This allows you to see not only your pitch accuracy, but sounds such as sibilance, plosives, and overtones.
It can auto-detect the nearest note to your pitch or lock to a specific note, depending on your needs. The app also includes a mini-piano for reference tones and a recorder that can save and export audio.
With BetterPitch, improving your pitch becomes easier, as you can see your pitch in real-time, which allows your brain to learn faster than just relying on your ear.
Crescendo Voice
Vocal Exercise Companion
Jump into singing practice quickly anytime!
Crescendo Voice provides acoustic piano accompaniment for vocal exercises, dialed-in to your unique vocal range. This is the perfect companion for any style or school of singing lessons and vocal training.
It plays arpeggio-based singing exercises throughout your vocal range or sub-range, at the tempo and duration of your choice. Exercises can have accompanying instructions and demos including audio and video.
Build and customize exercise playlists, attach instructional audio or video (YouTube/Vimeo), then share these with others to take singing lessons with your students to the next level.
Enjoy community playlists based on lessons from your favorite YouTube vocal coaches. Watch their instructional videos and then jump into practice in your own vocal range.
Pitch tracking and performance recording give you insight into your techniques and help you document your progress. Easily export your audio recordings to share your singing with others.