Top accelerator startups

Startups14,448Programs29

14,448 startups · 29 programs

SideKit

Active · Consumer app studio.

WebsiteYC profile

Why it ranks

How the rank works
7signal of 100 · rising 7
  • went through YCProgram · this site+4
  • team of 2Team size · YC's directory+2.5

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

Competitors

AIDRSShared: app studio, consumer appspeedrun SR007SFStartup →AIFictionalShared: consumer app, kindspeedrun SR007San FranciscoStartup →Developer toolsshortkitShared: consumer appYC W26Startup →AIEgoist MachinesShared: consumer appYC S26San FranciscoStartup →AIExplorexShared: consumer appYC S20BengaluruStartup →
Companies closest to SideKit
Company
DRSShared: app studio, consumer appspeedrun SR007Not statedAI
FictionalShared: consumer app, kindspeedrun SR007Not statedAI
shortkitShared: consumer appYC W26ActiveDevtools
Egoist MachinesShared: consumer appYC S26ActiveAI
ExplorexShared: consumer appYC S20ActiveAI

Adjacent

OtherTheyaShared: consumer appYC W23San FranciscoStartup →AIShaiShared: studioAntler 2023NetherlandsStartup →OtherPlatogoShared: studioSeedcamp 2009Startup →AIUnakinShared: studioEF 2023LondonStartup →AIKata.aiShared: different kind500 Global 2015IndonesiaStartup →
Companies next to SideKit
Company
TheyaShared: consumer appYC W23ActiveOther
ShaiShared: studioAntler 2023Not statedAI
PlatogoShared: studioSeedcamp 2009Not statedOther
UnakinShared: studioEF 2023 +1Not statedAI
Kata.aiShared: different kind500 Global 2015Not statedAI

Also from W26 in AI

All of W26
AICorveraThe AI sales agent for CPG brandsYC W26San FranciscoStartup →AI/dev/fast/dev/fast is the AI-native code forgeYC W26San FranciscoStartup →AI10x ScienceThe AI-native platform for next-generation protein characterization.YC W26San FranciscoStartup →AI21stUI building blocks for the agentic internetYC W26San FranciscoStartup →AIAemonThe Forward-Deployed AI Research EngineerYC W26San FranciscoStartup →AIAgentic FabriqThe control plane for AI agents.YC W26San FranciscoStartup →
Company
CorveraThe AI sales agent for CPG brandsteam of 4hiringActiveAI, Data
/dev/fast/dev/fast is the AI-native code forgeteam of 4ActiveAI, Devtools
10x ScienceThe AI-native platform for next-generation protein characterization.team of 5hiringActiveAI
21stUI building blocks for the agentic internetteam of 3ActiveAI, Devtools
AemonThe Forward-Deployed AI Research Engineerteam of 3hiringActiveAI, Devtools
Agentic FabriqThe control plane for AI agents.team of 2ActiveAI

Founders

  • Ethan PronevFounder
  • Ashish SelvarajFounder

About SideKit

SideKit is a consumer app studio that makes Island, a different kind of screen time app.

YC batch
W26 · Winter 2026
Status, per YC
Active
Category
AI, Developer tools
Team size
2
Location
Toronto, ON, Canada
Founded
2025
Checked
6h ago

YC tags: Consumer, AI

Changes seen

TagsNov 2, 2026

Newly tagged Consumer; no longer tagged Enterprise Software and Infrastructure.

Source ↗
NameOct 22, 2026

Renamed from Approxima.

Source ↗
WebsiteOct 22, 2026

Moved its website from approxima.ai to appsidekit.com.

Source ↗
Former namesOct 22, 2026

Former name added: Approxima.

Source ↗
Website linkOct 22, 2026

Website link changed from https://approxima.ai to https://appsidekit.com.

Source ↗
One-linerOct 22, 2026

Rewrote its one-liner; it read "Your software should build itself."

Source ↗

SideKit in W26: 199 companies, 81% AI

GitHub LinkedIn

SideKit: questions

Which YC batch was SideKit in?

SideKit was in Y Combinator's Winter 2026 batch (W26).

Is SideKit still active?

Y Combinator lists SideKit as active.

Who founded SideKit?

SideKit's founders, as listed on its YC page: Ethan Pronev (Founder), Ashish Selvaraj (Founder).

Where is SideKit based?

SideKit lists Toronto, ON, Canada as its location on YC's directory.