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14,448 startups · 29 programs

MobileBoost

Active · AI SDET for mobile apps

10signal of 100 · rising 2
  • team of 15Team size · YC's directory+6.2
  • went through YCProgram · this site+4

A sum of public facts, not a judgement and not investment advice.

Competitors

Adjacent

Also from S21 in AI

All of S21

About MobileBoost

MobileBoost is an AI SDET for iOS and Android apps. An agent turns a plain-language test spec into test code, runs it on simulators and real devices, and fixes it when your app changes. Nobody on your team maintains test scripts by hand. The test code is accessible at any time if your team wants that level of access. You can start runs from your CI pipeline with the MobileBoost GitHub Action, or let your coding agent start them over MCP while you build. Mobile teams at Duolingo, Lyft, Wayfair, Flo Health, Noom, Compass, and Redfin use MobileBoost. Duolingo cut manual regression testing by 70%: https://blog.duolingo.com/reduced-regression-testing/

YC batch
S21 · Summer 2021
Status, per YC
Active
Category
AI, Developer tools
Team size
15
Location
San Francisco, CA, USA; Remote
Checked
6h ago

YC tags: Developer Tools, Generative AI, B2B, No-code, AI

Changes seen

HeadquartersOct 8, 2026

Moved its headquarters from Berlin, Berlin, Germany; Remote to San Francisco, CA, USA; Remote.

One-linerOct 8, 2026

Rewrote its one-liner; it read "AI native mobile testing."

TagsOct 8, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

RegionsOct 8, 2026

Now lists the region United States of America and America / Canada; no longer lists Germany and Europe.

MobileBoost in S21: 391 companies, 34% AI

MobileBoost: questions

Which YC batch was MobileBoost in?

MobileBoost was in Y Combinator's Summer 2021 batch (S21).

Is MobileBoost still active?

Y Combinator lists MobileBoost as active.

Where is MobileBoost based?

MobileBoost lists San Francisco, CA, USA; Remote as its location on YC's directory.