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Week 34 Aug 18 - Aug 24, 2026
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Understudy

Week 31

Record production traffic, replay it in tests

Testing Testing
Visit site understudy.dev
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About

Understudy launched in week 31 and finished at number 3. Its full listing is kept here as part of the archive.

Where Understudy fits

Understudy sits in the testing corner of most stacks, and is aimed at teams who have outgrown doing this part by hand. It runs on Web, and is free to start with paid tiers for teams.

It is a closed-source product, so evaluate it the way you would any vendor you plan to build a workflow around.

What you get on day one

Archived listing, and final vote count preserved, no longer accepting votes. The setup is deliberately small: the maker's argument is that a tool you have to schedule a migration for is a tool you will not adopt.

Whether that holds for your team depends on what you already run. The listing below and the feedback from other makers are the fastest way to find out.

What it does

  • Archived listing
  • Final vote count preserved
  • No longer accepting votes

Feedback 3

Feedback is public and shown to the maker.

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  • M
    Mara Ellis @maraellis 2d

    Been using this on a 40-table schema all week. The rollback generation alone saved me twice. One request: a dry-run flag that prints the SQL without touching anything.

  • D
    Devin Roy @droy 3d

    The plain-language summaries are the killer feature. My non-technical PM can review migrations now, which I did not expect to ever type.

  • S
    Sana Qureshi @sanaq 4d

    Works well with Postgres. MySQL support felt a bit behind, the enum diffing missed a case for me. Filed an issue and got a response the same day.

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