https://www.ospreylang.dev/docs/packages-in-vscode/ https://www.ospreylang.dev/assets/videos/osprey-package-manager-poster.jpg Add and remove Osprey packages in VS Code Browse Osprey packages, review audit warnings, add and verify a dependency, then remove it through the VS Code package workspace. https://www.ospreylang.dev/assets/videos/osprey-package-manager.mp4 48 2026-10-25T21:32:56+11:00 yes no no Osprey VS Code package manager dependencies package registry https://www.ospreylang.dev/docs/proofs/videos/dependent-types/ https://www.ospreylang.dev/assets/videos/osprey-dependent-types-poster.jpg What are dependent types?: for programmers Types can describe facts about values. Start with a list-length example, then watch Osprey check an actual identity proof. This version is for programmers. https://www.ospreylang.dev/assets/videos/osprey-dependent-types.mp4 100 2026-10-30T09:09:08+11:00 yes no no Osprey proofs What are dependent types? programmers https://www.ospreylang.dev/docs/proofs/videos/osprey-proof-kernel/ https://www.ospreylang.dev/assets/videos/osprey-proof-kernel-poster.jpg How Osprey checks a proof: for programmers Follow a statement and its evidence through the proof kernel written in Osprey. This version is for programmers. https://www.ospreylang.dev/assets/videos/osprey-proof-kernel.mp4 109 2026-10-30T09:23:14+11:00 yes no no Osprey proofs How Osprey checks a proof programmers https://www.ospreylang.dev/docs/proofs/videos/proof-workbench/ https://www.ospreylang.dev/assets/videos/osprey-proof-workbench-poster.jpg Meet the proof workbench: for programmers Write a small argument, inspect hypotheses and goals, and complete a guided exercise in the real Workbench. This version is for programmers. https://www.ospreylang.dev/assets/videos/osprey-proof-workbench.mp4 109 2026-10-30T09:15:56+11:00 yes no no Osprey proofs Use the Proof Workbench programmers https://www.ospreylang.dev/docs/proofs/videos/mathlib-bridge/ https://www.ospreylang.dev/assets/videos/osprey-mathlib-bridge-poster.jpg The Mathlib port is already underway: for programmers See selected imported proofs checked in Osprey and learn how the actual Mathlib Euclid import is progressing. This version is for programmers. https://www.ospreylang.dev/assets/videos/osprey-mathlib-bridge.mp4 166 2026-10-30T14:52:02+11:00 yes no no Osprey proofs The Mathlib port is underway programmers https://www.ospreylang.dev/docs/proofs/videos/proofs-that-say-no/ https://www.ospreylang.dev/assets/videos/osprey-proofs-that-say-no-poster.jpg A proof checker must say no: for programmers Compare a valid proof with deliberately corrupted evidence and a false replacement statement. This version is for programmers. https://www.ospreylang.dev/assets/videos/osprey-proofs-that-say-no.mp4 107 2026-10-30T09:10:14+11:00 yes no no Osprey proofs A proof checker must say no programmers https://www.ospreylang.dev/docs/proofs/videos/navier-stokes-proof/ https://www.ospreylang.dev/assets/videos/osprey-navier-stokes-proof-poster.jpg Navier-Stokes: OpenAI's published solution: for programmers Understand OpenAI's published Navier-Stokes solution and Lean formalization, then explore a real Osprey fluid calculation and checked Workbench exercise. This version is for programmers. https://www.ospreylang.dev/assets/videos/osprey-navier-stokes-proof.mp4 138 2026-10-30T15:01:32+11:00 yes no no Osprey proofs Navier-Stokes: computation and proof programmers https://www.ospreylang.dev/docs/proofs/videos/dependent-types-math/ https://www.ospreylang.dev/assets/videos/osprey-dependent-types-math-poster.jpg What are dependent types?: for mathematicians Types can describe facts about values. Start with a list-length example, then watch Osprey check an actual identity proof. This version is for mathematicians. https://www.ospreylang.dev/assets/videos/osprey-dependent-types-math.mp4 106 2026-10-30T09:15:06+11:00 yes no no Osprey proofs What are dependent types? mathematicians https://www.ospreylang.dev/docs/proofs/videos/osprey-proof-kernel-math/ https://www.ospreylang.dev/assets/videos/osprey-proof-kernel-math-poster.jpg Inside a small proof kernel: for mathematicians Follow a statement and its evidence through the proof kernel written in Osprey. This version is for mathematicians. https://www.ospreylang.dev/assets/videos/osprey-proof-kernel-math.mp4 119 2026-10-30T09:27:43+11:00 yes no no Osprey proofs How Osprey checks a proof mathematicians https://www.ospreylang.dev/docs/proofs/videos/proof-workbench-math/ https://www.ospreylang.dev/assets/videos/osprey-proof-workbench-math-poster.jpg The proof workbench: goals and evidence: for mathematicians Write a small argument, inspect hypotheses and goals, and complete a guided exercise in the real Workbench. This version is for mathematicians. https://www.ospreylang.dev/assets/videos/osprey-proof-workbench-math.mp4 110 2026-10-30T09:22:28+11:00 yes no no Osprey proofs Use the Proof Workbench mathematicians https://www.ospreylang.dev/docs/proofs/videos/mathlib-bridge-math/ https://www.ospreylang.dev/assets/videos/osprey-mathlib-bridge-math-poster.jpg Osprey rechecks imported mathematical proofs: for mathematicians See selected imported proofs checked in Osprey and learn how the actual Mathlib Euclid import is progressing. This version is for mathematicians. https://www.ospreylang.dev/assets/videos/osprey-mathlib-bridge-math.mp4 172 2026-10-30T15:08:15+11:00 yes no no Osprey proofs The Mathlib port is underway mathematicians https://www.ospreylang.dev/docs/proofs/videos/proofs-that-say-no-math/ https://www.ospreylang.dev/assets/videos/osprey-proofs-that-say-no-math-poster.jpg Rejection is part of the proof: for mathematicians Compare a valid proof with deliberately corrupted evidence and a false replacement statement. This version is for mathematicians. https://www.ospreylang.dev/assets/videos/osprey-proofs-that-say-no-math.mp4 105 2026-10-30T09:15:48+11:00 yes no no Osprey proofs A proof checker must say no mathematicians https://www.ospreylang.dev/docs/proofs/videos/navier-stokes-proof-math/ https://www.ospreylang.dev/assets/videos/osprey-navier-stokes-proof-math-poster.jpg Navier-Stokes: the published solution, then an exact flow: for mathematicians Understand OpenAI's published Navier-Stokes solution and Lean formalization, then explore a real Osprey fluid calculation and checked Workbench exercise. This version is for mathematicians. https://www.ospreylang.dev/assets/videos/osprey-navier-stokes-proof-math.mp4 145 2026-10-30T15:11:05+11:00 yes no no Osprey proofs Navier-Stokes: computation and proof mathematicians https://www.ospreylang.dev/docs/tutorials/profiler/ https://www.ospreylang.dev/assets/videos/osprey-profiler-poster.jpg Profiling Osprey programs in VS Code: CPU, memory and leaks A four-minute tutorial. Read two sample programs and predict where the time goes, then profile them in VS Code, read the flame graph and the heat on the source, attach to a running program, compare Osprey's memory backends, and check for leaks with ARC. https://www.ospreylang.dev/assets/videos/osprey-profiler.mp4 256 2026-10-23T15:26:00+11:00 yes no no Osprey profiler CPU profiling flame graph VS Code memory management ARC leak detection https://www.ospreylang.dev/docs/tutorials/swift-interop/ https://www.ospreylang.dev/assets/videos/osprey-swift-interop-poster.jpg Osprey exports and externs: one app for the Mac and iPhone with Swift A four-minute tutorial. Osprey exports compile to a C header that Swift calls, Swift @_cdecl functions become Osprey externs, an effect keeps the boundary testable, and one Xcode target ships the app to the Mac and the iPhone. Then the Osprey tests, and an edit to the hidden-files rule that they catch. https://www.ospreylang.dev/assets/videos/osprey-swift-interop.mp4 261 2026-10-20T20:32:57+11:00 yes no no Osprey Swift SwiftUI macOS iOS C interop @_cdecl Xcode algebraic effects https://www.ospreylang.dev/docs/osprey-native/agent/ https://www.ospreylang.dev/assets/videos/osprey-agent-native-poster.jpg Osprey Agent: a native coding agent in action Watch the real macOS SwiftUI agent: inspect failed tests, review an edit and its successful verification, then read the corrected code. Narrated walkthrough of a recorded calculator conversation, with native controls and AOT Osprey application logic. https://www.ospreylang.dev/assets/videos/osprey-agent-native.mp4 80 2026-11-03T18:48:19+11:00 yes no no Osprey Native SwiftUI AI coding agent AOT native applications https://www.ospreylang.dev/docs/tutorials/chromecast-from-mac/ https://www.ospreylang.dev/assets/videos/osprey-chromecast-from-mac-poster.jpg Osprey effects for I/O: a Chromecast sender you can test with no TV A seven-minute tutorial. Write every byte of input and output as one Osprey effect, return failures as Result, answer the effect with a real handler in the app and a fake one in tests. The worked example is the @osprey/chromecast package and the casting player: discovery, the CAST v2 frame format, serving the file, the app's adapter, eight tests with no TV, and an edit the tests catch. https://www.ospreylang.dev/assets/videos/osprey-chromecast-from-mac.mp4 441 2026-11-01T13:40:00+11:00 yes no no Osprey Chromecast Google TV macOS casting GPUI https://www.ospreylang.dev/docs/tutorials/rust-ui-framework-without-rust/ https://www.ospreylang.dev/assets/videos/osprey-rust-ui-framework-without-rust-poster.jpg GPUI apps in Osprey: a Rust UI framework without writing Rust A five-minute tutorial. GPUI's own painting example ported to Osprey, file by file: the two-function boundary the Rust host calls, the store, the drawing rules and the view. Then its tests and headless self-test with no window, and an edit to the dash pattern that one test catches. https://www.ospreylang.dev/assets/videos/osprey-rust-ui-framework-without-rust.mp4 311 2026-11-01T13:40:00+11:00 yes no no Osprey GPUI Rust UI framework state machines Osprey Native https://www.ospreylang.dev/docs/tutorials/static-typing-python/ https://www.ospreylang.dev/assets/videos/osprey-static-typing-python-poster.jpg Type inference in the Osprey Python flavor: static types with no hints A five-minute tutorial. Python-style code with no annotations, type-checked before it runs: a small sample, the error a wrong argument gives, records, Result and match, effects, and the @osprey/chromecast package checked against CPython. Then one edit that mixes two return types, caught at compile time. https://www.ospreylang.dev/assets/videos/osprey-static-typing-python.mp4 290 2026-11-01T13:40:00+11:00 yes no no Osprey Python flavor static typing type inference Python https://www.ospreylang.dev/docs/tutorials/ui-testing-by-label/ https://www.ospreylang.dev/assets/videos/osprey-ui-testing-by-label-poster.jpg Testing Osprey apps by label with @osprey/uitest A six-minute tutorial. Where a control's role and label come from, how @osprey/native builds the accessibility tree, how @osprey/uitest finds controls by label and drives them with real pointer events, a whole journey from the casting player's tests, and an edit that renames one label and fails three tests. https://www.ospreylang.dev/assets/videos/osprey-ui-testing-by-label.mp4 377 2026-11-01T13:40:00+11:00 yes no no Osprey UI testing accessibility AI agents end-to-end tests