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RunKit (YC S16) — accelerator company

RunKit is the best tool for prototyping server-side JavaScript. RunKit notebooks remove the friction of trying new ideas.

RunKit is a Y Combinator company in the Summer 2016 batch. The founders listed are Francisco Tolmasky (Founder/CEO), Pieter Ouwerkerk (Founder), Wolf Rentzsch (Founder) (Y Combinator directory entry, June 21, 2016).

6 more companies from YC Summer 2016 ↓

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RunKit

New accelerator entry · 2016-06-21 · the record

Summer 2016
batch
2
people
Early
stage
United States of America
region
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What the record says

BatchSummer 2016
Announced2016-06-21
StageEarly
StatusAcquired
Team size2
IndustryB2B
Sub-industryB2B -> Engineering, Product and Design
RegionsUnited States of America, America / Canada
BasedSan Francisco, CA, USA
HiringNo
Sitehttps://tonicdev.com
Previously known asTonic

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More on RunKit and the records around it.

Also in YC Summer 2016

Same batch, B2B first.

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In their words

RunKit is the best tool for prototyping server-side JavaScript. RunKit notebooks remove the friction of trying new ideas. With one click, you'll have a sandboxed JavaScript environment where you can instantly switch node versions, use every npm module without having to wait to install it, and even visualize your results.

Want the whole picture on RunKit?

Example from a real report (our sample on Target): “Target eliminated approximately 1,800 corporate positions, with around 1,000 employees receiving layoff notices and the remainder accounted for by eliminating open roles.” Source: NBC News

A Full Report on RunKit: verified, sourced, every claim cited, ready in a few minutes. See pricing.

What the Full Report on RunKit covers

  1. The Short Answer

  2. Which Company This Is

  3. What They Do, And How The Money Works

  4. Who Runs It, And How To Reach Them

  5. The Money: Funding, Valuation, Runway

  6. Who Pays Them, And Who They Are Up Against

  7. Warning Bells

  8. Sources

    8 cited sources found

Plus the sections for what you are deciding, which you pick after ordering.

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First screen of a real sample Full Report on EchoStar: the verdict, 17 sections, 63 cited sources, built 2026-10-21A real finished report, first screen. Opens in a new tab.

The full profile

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Sourced from the company's Y Combinator directory entry, and from Hacker News, where 1 thread met the matching rule stated beside the count.

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RunKit: Accepted into Y Combinator Summer 2016
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Permanent URL: https://mentionfox.com/funding/yc-runkit
Last updated 2026-10-20
Primary record: Y Combinator directory entry
RunKit (YC S16). MentionFox, 2026-10-20. https://mentionfox.com/funding/yc-runkit