Justin Bao

Jira keeps our launches sane across iOS, macOS, Android, and Windows. It’s how we track priorities, connect bugs to releases, and make sure nothing slips when things move fast. Simple, reliable, and easy to coordinate around.

Figma is where Filo’s interface gets solved before it gets built. We use it for rapid exploration, tight component systems, and quick feedback loops across design, product, and engineering. It’s still the best place to keep everyone aligned on the details.

Cursor is the fastest way we ship. It helps us iterate on UI and logic in one flow, refactor confidently, and turn vague ideas into working code quickly. The “ask in context” workflow saves us a ton of back-and-forth compared to traditional editors.

Primarily used for in-app AI chat. Claude handles long threads gracefully, stays focused, and gives safe, well-structured answers—perfect for extended conversations with users.

We switch to GPT-4o for “AI Compose” and smart reply generation. Its writing quality, tone control, and multilingual accuracy make the outputs feel human and on-brand.

Our default engine for most smart tasks. It’s the fastest by a wide margin, so we use it for labeling, summarization, extraction—anything that needs real-time latency—while still getting solid reasoning.

Cursor feels like an extra engineer on the team. Its AI commands understand our whole codebase, so we can batch-generate repetitive pieces—multi-language localization strings, boilerplate functions, refactors—across frontend and backend in minutes instead of hours. The tight in-editor workflow and reliable context make it far more useful than other AI helpers we’ve tried. Huge productivity boost.

Gemini 2.5’s ultra-long context window, blazing response speed, high-quality outputs, and transparent, cost-effective pricing make it our top pick over other LLMs.

Claude 3.7 powers Filo’s core engine because its unmatched depth of reasoning, consistently crisp prose, and rock-solid reliability outperform every other model we benchmarked.

GPT-4o delivers state-of-the-art reasoning and translation at half the latency of rivals in our internal benchmarks.

Gmail’s rock-solid IMAP/REST APIs and market-leading spam filters give us the most reliable baseline to innovate on top of.

Xcode’s SwiftUI previews, Instruments, and one-click TestFlight uploads keep our entire iOS pipeline inside one native tool—no plug-ins, no context-switch.

Figma’s real-time multiplayer editing lets design + dev iterate in one file, cutting our mock-to-build cycle by an entire sprint compared with Sketch.

Cursor’s inline AI refactors & tests code in seconds, letting our tiny team ship features way faster than VS Code + Copilot.

I’ve been using Filo Mail for a few weeks now, and it’s been a refreshing change from the usual email chaos. The minimalist design and AI-powered features—especially the smart to-do extraction and thread summarization—have made managing my inbox effortless. It’s like having a personal assistant that keeps my focus on what really matters. Of course it is still in its early stage, but since it's free for all, why not give it a try?