Correct behavior is often implicit
When the spec lives in threads and heads, QA has to infer correct behaviour. Sometimes the inference is wrong.
Proposal review
Catch the problems before the work starts
Codemix flags gaps in the proposal — ambiguities, missing cases, or things that conflict with how the product already works. Resolve them here, and the work that follows is far less likely to need rethinking.
The intent gap
You can only test against a spec you can actually see.
QA engineers are good at testing. The harder part is knowing what correct behaviour is, especially for undocumented edge cases and agent decisions nobody reviewed.
When intent is implicit, the implementation becomes the spec. Testing against that tells you what the product does. It does not tell you whether it is right.
Edge cases with no documented decision
Agents fill gaps with plausible behaviour. QA gets no signal about which edges were approved and which were invented.
Testing the implementation, not the intent
Testing what the product does is not the same as testing whether it does what was decided.
Ambiguity becomes sign-off risk
When correct is unclear, sign-off becomes judgement. The later bug report is just the expensive version of an unanswered question.
Start from what was decided
Know what the product is supposed to do before you start testing
QA tests against the spec. The problem is that the real spec often is not queryable.
Codemix keeps product intent structured: concepts, flows, rules and decisions. Before writing cases, you can ask what correct means.
Project overview
See everything in flight, at a glance
The overview surfaces every active proposal, running task, and recent conversation in one place — no status updates required. Codemix keeps it current as work progresses, so anyone on the team can see what's happening and where things stand.
Test edge cases against real decisions
Know which edge cases were decided and which were assumed
The hard edge cases depend on decisions. Those decisions are often the least visible part.
Codemix keeps decisions, constraints and edge handling with the product context. You look them up instead of guessing.
Task plan
A complete task plan, ready to execute
Once a proposal is approved, codemix breaks it into parallelisable tasks and executes them autonomously. The task plan keeps every behavioural commitment visible while the build is underway.
Ask what the right behavior is
Get the answer when a test case depends on knowing the rule
Edge cases surface during testing. That is fine. Hunting through old threads is not.
Codemix lets you query the product model during testing. You get the rule for the case in front of you, grounded in approved intent.
Conversations
Work through the problem together
Codemix grounds every reply in how your product actually works — not generic advice, but specific to your codebase and domain. When you're ready, it drafts a proposal that captures the intent in a form the rest of the team can review and challenge.
Verify what shipped against what was approved
Check whether the product conforms to its own intent
The final QA question is not just whether the tests pass. It is whether the product matches the decision.
Codemix compares current behaviour with approved intent. It catches the divergence that compiles cleanly and fails conceptually.
Proposal review
Catch the problems before the work starts
Codemix flags gaps in the proposal — ambiguities, missing cases, or things that conflict with how the product already works. Resolve them here, and the work that follows is far less likely to need rethinking.
How it works
How Codemix carries context through the full lifecycle
Most product drift happens in the handoffs: from discussion to spec, spec to task, task to code, and code back to the roadmap. Codemix keeps those handoffs explicit.
- 00start
Start with a conversation or from code
Chat with codemix if you're still at the idea stage, or import your existing codebase.
A product baseline
Start with an interview
Talk through the product in plain English. Codemix turns the important parts into something the team can inspect, question, and build from.
Start with the repo
Connect the existing codebase. Codemix reads how the system behaves today, including the bits nobody remembered to write down.
- 01model
model the product
Codemix builds a working model of the product: the concepts, screens, actions, rules, edge cases, and decisions that explain how it is meant to behave.
A model the team can ask about
- 02proposal
shape the change
Before implementation starts, you can ask questions, edit the spec, and turn a rough idea into a concrete proposal for what should change.
A proposal people can review
- 03tasks
write the tasks
Once the proposal is approved, Codemix turns it into implementation work. Send it to Linear or Jira, hand it to a coding agent, or let humans and agents split it up.
Tasks with the context attached
- 04answers
answer questions mid-build
Implementation always uncovers questions. Codemix gives engineers and coding agents answers from the product model, so they don't have to guess from a ticket title or a nearby file.
Product answers during the build
- 05review
review what changed
Codemix reviews the code against the product decision, not just against style, tests, or neighbouring code. That's where a lot of agent mistakes hide.
Review that checks intent
- 06release
ship, then update the spec
Shipping often reveals details nobody saw at planning time. Codemix helps fold those decisions back into the spec, so the source of truth doesn't go stale the moment the PR lands.
Code and spec brought back together
- 07feedback
bring the context forward
Bring in bugs, customer feedback, support notes, and product signals. The next proposal starts with the context you already built, instead of another round of archaeology.
A better starting point next time
Pricing
codemix pays for itself on day 1.
Build better apps with codemix faster than ever before. Save time, stop wasting tokens and keep humans in control.
Pay As You Go
for solo builders
$50
pro user / month, for teams
20k
credits per pro user / month
Solo
For one-person workspaces that want to try codemix without committing to a subscription.
Pay as you go
- Single-user workspace
- Try for just $20
- Upgrade to Pro for Slack, hosted code analysis, invites, and code review
Pro
Self-serve pricing for teams ready to start now.
$50
$500 per user yearly. 2 months free.
- 20,000 pooled credits per user
- Monthly or annual billing
- Start immediately
Enterprise
For teams that need custom terms, SSO, compliance, or support.
Contact sales
- SSO and Access Control
- Custom terms
- Compliance and support
Ready to test with more confidence?
Stop testing the accident. Test the decision.
Codemix gives QA engineers the product model to write test cases from intent, resolve edge case ambiguity and sign off against the product's actual specification.
No credit card required.