ByteAsk is an AI coding agent built for C and C++ that verifies its own work before you ever see it. Every change it makes is compiled, run through sanitizers, and tested against the real build, so what reaches you is a diff that already builds and passes. The product launched on Y Combinator Launches on 10 November 2026. You can see the official site at https://byteask.ai/.
What is ByteAsk?
Most coding agents work from text: they read files, guess at intent, and hand back a patch. ByteAsk starts from the build itself. It reads the real build presets, flags, and macros to find the exact function that needs changing, then builds the change and runs the tests before and after, with ASan, UBSan, TSan, and static analysis in the loop. When a program crashes, it can join a gdb session to find out why.
That matters most in C and C++, where a small mistake can mean a memory bug that only shows up in production. ByteAsk is designed for teams that cannot afford that kind of surprise, and for codebases where the build system is half the knowledge.
Key features
- Reads the real build, presets, flags, and macros, to find the right function instead of guessing from text.
- Builds every change and runs tests before and after, with ASan, UBSan, TSan, and static analysis, and joins gdb sessions on crashes.
- Works through Claude Code, Codex, Cursor, Windsurf, and VS Code, using MCP and a CLI, and takes tasks from Jira, Linear, or @ByteAsk in Slack.
- Runs on prem or air gapped, using your own model key through an internal gateway, with zero data retention and no repo used to train models.
- SSO and SCIM, audit logs, and per user and per organization spend limits on the Enterprise plan.
- Supports LLVM, GCC, clang, CMake, vcpkg, Conan, GitHub, GitLab, Bitbucket, Jenkins, and GitHub Actions.
Who is it for?
ByteAsk fits C and C++ developers and teams working on systems code, embedded software, game engines, and performance critical services, where a wrong change is expensive. It also fits organizations with strict data rules, since it can run on prem or air gapped and never trains on your repos.
Because pricing is per workspace rather than per seat, it suits teams that want the whole group to use the agent without counting seats, and solo developers who want a free tier to try it on a real repo first.
Pricing
ByteAsk is free to start, at $0 with $5 of usage credit each month and no card required, covering 1 Cloud Agent task at a time, 1 Cloud Agent repo, context for 1 private repo up to 100,000 lines, and up to 50 members. The Pro plan costs $20 a month or $200 a year, with $20 of credit a month, 3 Cloud Agent repos, and context for 3 private repos up to 1 million lines. The Max plan costs $100 a month or $1,000 a year, with $100 of credit a month, 2 tasks at once, 10 repos, and context up to 5 million lines. The Ultra plan costs $200 a month or $2,000 a year, with $200 of credit a month, 4 tasks at once with a priority queue, 25 repos, and context up to 20 million lines. Enterprise pricing is custom. Plan fees are credited back as usage credit. Extra usage is billed at the model provider list price plus 20 percent, or with no markup when you use your own key, and the cloud sandbox costs $0.40 an hour. Top ups start at $10 and last 12 months. You can see current pricing on the official ByteAsk website.
Pricing may change; see the official website for current pricing. Details below reflect the official site as checked on 11 November 2026.
Image: byteask.ai (official visual)
