Mirrors
New accelerator entry · 2026-09-10 · the record
In their words
Mirrors provides regression testing for AI agents. Teams shipping agents constantly change prompts, models, and tools, and there's no way to test any of it. Agents call bespoke internal tools and APIs no test framework can reproduce, so most teams ship on vibes. Mirrors rebuilds the tools your agent calls from your own production traces, then replays real sessions against every change before it merges. You see which tool calls changed, which arguments moved, and where state landed differently. And when something fails, we tell you whether your agent regressed or something upstream moved. Built for teams whose agents take irreversible actions. Refunds, record updates, outbound email. Runs in your CI on every PR.
What the record says
Where this sits on the site
Checked away from the directory entry. Neither line below comes from the company's Y Combinator page.
Mirrors builds a runnable twin of the systems your AI agents call from their traces, then replays real sessions against every prompt, tool or model change.
The title and description the site itself served, answering 200. Not a cached copy and not the company's directory entry — what was live when we asked.
Counted only where a thread links to this company's own site, announces it by name on that forum, or names it beside its own Y Combinator batch. A thread whose title merely carries the words is not counted — a name is not an identifier. More may exist than the one page of results read here. Hacker News is not us, and nothing above is our opinion of the company.
Founders, titles and bios as the company published them. Photographs are our own copies of the ones on that record, so they do not break when the original link expires.
Against the 40 companies on file from Fall 2026. Median team 2, largest 6.
Interest Score
Every component below is a field already shown elsewhere on this page.
| Component | What it read | Adds |
|---|---|---|
| Team size against its batch | 2 on the directory entry | 3 (up to 25) |
| Founders named | 1 named | 6 (up to 15) |
| Site answered when asked | https://www.runmirrors.com/ answered | 20 (up to 20) |
| Public repository linked | no GitHub account is linked | 0 (up to 20) |
| Named on Hacker News | a thread carries the company by name | 20 (up to 20) |
| Score | 49 out of 100 | |
Each component adds up to the share of 100 shown beside it, and one this kind of record cannot carry is left out rather than counted as zero, because a directory entry states no offering amount or investor count. It measures how much publicly checkable activity surrounds this record today. It is not growth, not traction, not quality, and it is not a prediction.
Companies doing the same kind of thing (B2B › Infrastructure), matched on the sectors each one lists rather than on when it was admitted.
| Rank | Company | Score | Team size | Listed | Founders named | Tech signals |
|---|---|---|---|---|---|---|
| 1 | Asciileads | 76 | 3 people · 62nd pctadds 29 | 2026-08-31 · 10d agoadds 27 | 2adds 20 | 1not scored |
| 2 | Inkbox | 65 | 3 people · 57th pctadds 25 | 2026-07-01 · 71d agoadds 13 | 3adds 27 | 2not scored |
| 3 | Speko | 58 | 4 people · 74th pctadds 34 | 2026-07-07 · 66d agoadds 13 | 1adds 11 | 2not scored |
| 4 | Mirrorsthis page | 44 | 2 people · 10th pctadds 6 | 2026-09-10 · 1d agoadds 27 | 1adds 11 | not stated |
| 5 | GitCafe | 35 | 2 people · 9th pctadds 4 | 2026-07-29 · 43d agoadds 20 | 1adds 11 | 1not scored |
| 6 | Codag | 24 | 1 person · 0th pctadds 0 | 2026-05-24 · 110d agoadds 13 | 1adds 11 | 3not scored |
A score out of 100 comparing what each company's record shows for team size within its batch, listing recency and founders named.
- Team size within its batchup to 46
- Listing recencyup to 27
- Founders namedup to 27
- Tech-stack signalsshown, not scored
- 75 and up
- 55 to 74
- 35 to 54
- under 35
| Company | Batch | Sectors | Listed |
|---|---|---|---|
| GitCafe | Summer 2026 | Developer Tools, B2B, DevOps | 2026-07-29 |
| Inkbox | Summer 2026 | Developer Tools, Infrastructure, AI | 2026-07-01 |
| Speko | Summer 2026 | Developer Tools, AI, Conversational AI | 2026-07-07 |
| Ascii | Fall 2026 | Developer Tools, Cloud Computing | 2026-08-31 |
| Codag | Summer 2026 | Developer Tools | 2026-05-24 |
| Context.dev | Summer 2026 | B2B, AI, APIs | 2026-06-01 |
| Decawork | Summer 2026 | B2B, Infrastructure, AI | 2026-07-28 |
| Executor | Summer 2026 | AIOps, Artificial Intelligence, SaaS | 2026-07-29 |
| Experiential Labs | Summer 2026 | Reinforcement Learning, Infrastructure, AI | 2026-06-28 |
| Familiar | Summer 2026 | Generative AI, B2B, Entertainment | 2026-08-12 |
| hiloop | Summer 2026 | Artificial Intelligence, Developer Tools, Machine Learning | 2026-07-29 |
| Hopper | Fall 2026 | Infrastructure, AI | 2026-09-04 |
| machine0 | Summer 2026 | Developer Tools, Cloud Computing | 2026-06-09 |
| Magma | Summer 2026 | Reinforcement Learning, Data Engineering, AI | 2026-08-13 |
| Maritime | Fall 2026 | Developer Tools, Cloud Computing, Infrastructure | 2026-08-31 |
| Mireye | Summer 2026 | Geographic Information System, AI, Location-based | 2026-06-14 |
| Orchestra | Summer 2026 | Artificial Intelligence, Open Source, AI | 2026-07-11 |
| Parasma | Summer 2026 | Machine Learning, Neurotechnology, AI | 2026-06-24 |
| Riften | Summer 2026 | Artificial Intelligence, Developer Tools, Reinforcement Learning | 2026-08-04 |
| Understudy Labs | Summer 2026 | Artificial Intelligence, Open Source, AI | 2026-07-11 |
| Caution | Summer 2026 | Cybersecurity, Cloud Computing, Infrastructure | 2026-08-03 |
| Dialogus | Summer 2026 | B2B, Customer Support | 2026-06-27 |
| Edviro | Summer 2026 | Deep Learning, B2B, Energy | 2026-06-30 |
| Limrun | Spring 2026 | — | 2026-05-19 |
| Markov | Summer 2026 | Reinforcement Learning, Data Labeling, Data Engineering | 2026-06-24 |
| Mirrors (this page) | Fall 2026 | Developer Tools, SaaS, B2B | 2026-09-10 |
214 other records here share at least one sector with this one; the 25 nearest are in the table.
- 1 founder named on the directory entry.
- One of 32 companies held here in B2B › Infrastructure.
No investor is drawn from a Form D — the form states how many invested and never who. The one investor on this graph is named because a batch has exactly one.
The full profile
Source Check, INVEST, RECRUIT and Press Requests on Mirrors
- Source Check — verify Aryan Singhal's other claims against the registers that hold them.
- INVEST — compare this company against the peers above, on the numbers.
- RECRUIT — see who is already on the team.
- Press Requests — connect with Aryan Singhal for a story.
You land back on this company when you are in.
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Is this you?
If you're behind Mirrors: acceptance into a YC batch is one of the few weeks a young company gets looked up by people who matter — investors, other founders, press. FoxPlug turns the commits, deploys, and releases you're already making into that story automatically, so anyone who looks finds something current. FoxChat puts a guide on your own site so the people YC's own page just sent you don't read one line and leave.
Sourced from the company's Y Combinator directory entry, from the company's own site, read directly on 2026-09-10 (runmirrors.com), and from Hacker News, where 3 threads met the matching rule stated beside the count.