Custom software, built by AI and reviewed by a different AI

Start uncertain.
Finish certain.

Bring just the idea. AI builds it fast, and a different AI reviews it. You follow every step on a live board.

Tell us your idea See the live board
Confirmed Web app confirmed. It passed the automated checks and carries review evidence.

From web to games, one team builds it all

Every platform gets the same process: built the same way, graded by the same standard.

Web apps

From company websites to admin tools and subscription services.

Mobile apps

Native apps, each tailored to iPhone and Android.

Cross-platform apps

One codebase ships the iPhone and Android apps together.

Games

From browser games you can play right away to Unity games. The game here, EIGEN RUN, really runs on this page.

Jump over bugs and collect the gold evidence. Collect in a row to score more.

The AI is playing. Press the screen to take over.

JumpSpace↑Enteror click, tap

What past clients say

Reviews received
135reviews
Average rating
4.84
  • Fast & prompt 39reviews
  • Friendly, clear explanations 30reviews
  • Follows requirements, handles revisions 26reviews
  • Would hire again, recommend 16reviews

One review can fit several of these.

  • You were so kind and a huge help. We’re just starting a startup club, and your help let us get great results!! Thank you again so much.

    예*****

  • You gave kind and quick advice. I’m happy with the result, and I think our team’s presentation of it will go well too! Thank you

    건*****

  • Always kind with your answers, and even though I had lots of requirements and questions, you answered every one with care T_T The best.

    인*****

  • Thank you so much for handling my demanding request without a big extra charge.

    lea*****

  • You answered my questions kindly even before the work started, and what I especially liked was that you showed me interim results and kept me posted on progress! You also delivered a good result ahead of the scheduled date. Thank you haha. If I have more work to ask about next time, I’d like to ask you again!~~

    lea*****

  • It was my first request, but you were kind and solved the problem quickly. I’d like to ask you again next time.

    lea*****

  • Yes, thank you for your work. After some time, ads started showing up. Thank you for your hard work. I’ll be back to see you soon.

    K98*****

  • Thank you for handling so many requests. It took a little time, but I think the result turned out very satisfying!

    깜*****

  • You made it neatly, just as I wanted. You also sent it on time, and I like the result! You kindly answered all the questions I asked. Thank you. Recommended~

    lea*****

  • It went perfectly the way I wanted. I plan to build my next app with this team too, not just this one.

    K95*****

  • You developed everything to meet our requirements, and faster than we expected.

    lea*****

  • Thank you so much!!!! I’m a beginner and I bothered you so much from start to finish, but you helped with everything and never got annoyed, which makes me embarrassed. Thank you so, so much. I think I’ll only use you from now on !!! Other places give poor advice and just demand lots of money... you’re really the best!!!

    크*****

  • I knew nothing at all, but from just a rough idea I gave you, you built a truly excellent app. Thank you so much.

    속*****

  • I had lots of questions and requests, and you kindly handled them one by one. A big help. Thank you!!

    고*****

  • Thank you~ I had a project I needed in a hurry, and you did it fast so I solved it right away! Thank you for responding quickly even late at night!

    K81*****

  • You match your service description exactly. You built the app beyond what I hoped and expected. Even with frequent revision requests, and even over the Lunar New Year holiday, you kept in touch and took responsibility for revising it to the end. I wholeheartedly recommend you to anyone who wants an app built. Thank you.

    인*****

  • Fast, kind, and you understood exactly what I, the client, wanted. I was moved by the work :) You’re someone I’d like to keep to myself. I’ll definitely buy again next time, 100%!! Thank you ~~

    ㅇ*****

  • I requested an HTML notepad app, and you delivered what I wanted a full three days before the expected deadline! I asked for lots of small revisions, and you applied every one right away and were always friendly. I’ll use you again :)

    eri*****

  • I was so, so lucky to find someone who does such good work. Thank you so much. !!! I’ll use what you built to get the best possible results. You handled my revision requests so well, and I’m really satisfied. !!! If we lived nearby, I’d love to buy you a drink !!! Thank you so much. !!!

    K39*****

  • Thank you. You worked quickly and accurately to my requirements. Your response time is fast, and you answered all my questions kindly. I’ll use you again when the chance comes.

    눈*****

  • Thank you. Thank you for building the app I wanted so quickly. I’m so glad you looked after everything carefully from start to finish. Highly recommended!

    lea*****

Reviews are translated from the Korean originals. See all reviews

See what we’ve built

Watch the film first. Open a project to see its actual screens and how it works. Product screens appear in their original Korean.

A live board for every client

Don’t ask for status. Just look.

Every task moves in real time. What is being built, what is done, and where it got stuck is visible at a glance.

Store stock finder app

Progress 0%

  • iPhone
  • Android
  • Admin web

Live reports

    Select a card to see that task’s acceptance criteria and how it is graded.

    Four worries when you hire a development team

    • My plan isn’t finished. Can we still start?

      Yes. We fill the gaps with sensible defaults and begin. If you change something later, we rebuild only that part.

    • Do I have to keep asking where things stand?

      No. Just open the live board. It is there at night and on weekends too.

    • How do I know it’s really done?

      Every completed task comes with evidence: test records, screenshots, and the location in the code. No evidence, not done.

    • Can I trust AI to review AI’s work?

      The AI that builds and the AI that reviews are models from different companies. The reviewer takes no excuses. It only looks at the result.

    Uncertainty is raw material

    Give AI the same task twice and it builds it a little differently each time. Eigen uses that difference to try several paths. Then it keeps only what passes.

    1. We build it several times

      The builder AI makes candidates. If one fails, the next try takes a different path.

    2. Machines grade it

      Code checks whether the app builds, whether the features are right, and whether the standards are met. One failure and it fails.

    3. Only what passes stays

      Only candidates that pass grading reach the reviewer AI. Evidence must be attached before the next task starts.

    Odds of passing for seven candidates. When grading sweeps through, only one is left.

    You do three things

    Give us the idea, approve the plan, and try it yourself at the end. Eigen handles the rest.

    1. You

      Idea

      Send an idea, a spec, or designs. We tell you what is missing first.

    2. Planning AI, your approval

      Plan

      We write the task list, the order, and the acceptance criteria. You approve, and we start.

    3. Builder AI

      Build

      Tasks are built one by one. Tasks that don’t depend on each other are built at the same time.

    4. Automated checks

      Grade

      Code grades the work. If it fails, it goes back to the build.

    5. Reviewer AI, other company

      Review

      It looks only at the result and the evidence, then decides pass or fail.

    6. You

      Final check

      You try it and confirm. If something needs fixing, tell us right away.

    Three reasons you can trust the result

    It’s done only when the automated checks pass

    If even one check fails, neither the AI nor a person can mark the task complete. Review starts only after every automated check passes.

    • Does the app build?Build
    • Does the code follow the rules?Lint
    • Do the features work correctly?Unit tests
    • Acceptance criteria set in advance1 acceptance test failed

    1 check is failing. Review cannot start.

    The AI that builds doesn’t grade its own work

    The AI that builds and the AI that reviews are models from different companies. The reviewer AI never sees the builder AI’s explanations.

    Builder AIClaude

    • Tasks and acceptance criteria
    • Screen designs
    • Acceptance tests (view only)

    Reviewer AICodex

    • Changed code
    • Automated check results
    • Spec and designs
    • The builder AI’s explanations

    A plan you approved never changes behind your back

    The approved work plan is locked. If something has to change, we show you a new plan and ask for your approval again.

    Work plan, version 3Locked

    Tamper-proof fingerprint9f2c41d0 7be3a915 c06e2d48 e7a1

    Tasks
    12
    Acceptance criteria
    96
    Approved by
    You

    The default setup is Claude as the builder AI and Codex as the reviewer AI. You can swap the model for each role.

    The upside of uncertainty

    You can start without deciding everything

    The planning AI turns the gaps in your spec into questions and suggests a default for each, with its reasons. You just choose.

    Tasks
    23
    Acceptance criteria
    268
    Client checks
    16

    Q-4.2-1

    What title does a suspended user see?

    Default

    Your account is temporarily restricted

    Reference: spec section 4.2, status table

    Q-3.1-2

    Do we show recommendations when a search finds nothing?

    Default

    No. Only an empty-state message is shown

    Reference: spec section 3.1, empty screens

    Q-4.8-2

    What message appears when login fails?

    Default

    Login failed. Please try again

    Reference: spec section 4.8, error screens

    When we’re stuck, we tell you right away

    Only the blocked task pauses. Everything else keeps going. We tell you briefly why it is blocked and what you need to choose.

    Reports follow the writing rules of aircraft maintenance manuals (ASD-STE100). Short sentences. One idea per sentence. Written so you can decide right after reading.

    Blocker report

    S-03 Product detail screen

    No progress
    What happened
    After 3 rebuilds, the number of failing checks did not go down. We paused this task.
    Evidence
    The price display check failed 3 times in a row. We compared spec section 4.3, line 112, with the price field in the design.
    Cause
    The spec writes “$12.00”. The design writes “USD 12”. The two sources disagree.
    Your choice
    Pick one of the two. Once you do, we resume this task from where it stopped.
    Impact
    The 6 tasks that don’t depend on this one are still in progress.

    What you keep: a working product and the proof

    No hollow demos. Fake data, switched-off features, and screens that only look real all fail the reviewer AI.

    All the source code

    You get all the code and a record for every task. Each time a task is merged, every feature finished before it is checked again.

    1. a3f9c21feat(home): inventory summary card and recent list
    2. 7d02e4bfeat(search): empty-result message and retry
    3. 19be6a0fix(detail): match price format to the client’s decision
    4. c4410fdfeat(components): sold-out state on product card
    5. e81b7f3chore(foundation): app skeleton and build settings

    Something you can use right away

    A web address, an app install file, a game file you can play at once.

    Check records

    Everything we checked, and how.

    Final report

    Evidence and attempt history for every acceptance criterion.

    Client checklist

    What you check yourself, and how.

    Frequently asked questions

    What can you build?

    Web apps, native apps for iPhone and Android, cross-platform apps with Flutter and React Native, browser games, and Unity games.

    Do I need a spec?

    No. An idea is enough to start. The planning AI turns the gaps into questions and suggests defaults. You only choose.

    How do I follow progress?

    You get the address of your own live board. For each task, the status, the number of attempts, and the number of failing checks update at once.

    Can I trust code written by AI?

    Automated checks grade it first. Then an AI from a different company reviews the evidence. Each time a task is merged, every feature already finished is checked again.

    If I want to change something midway, do we start over?

    No. We rebuild only what changed. If you need a new feature, we show you a new plan and add it once you approve.

    Are my passwords and API keys safe?

    The spec lists names only. Real values are stored separately and used only while building and checking. They never appear in the code or the reports. A secrets check verifies this.

    A half-formed idea
    is enough to start.

    Send us an idea or a spec. We start by sorting out what’s missing.

    hojoon@eigen.builders