FREEDOM251

Freedom251 › Developer Tools

Free and open first

Best Sdk in 2026

This Sdk list covers software development kits and related tools for work across web, Android, Windows, Linux, iOS and macOS. It helps you compare tools by supported languages, package managers and target platforms.

  1. 1

    RevenueCat

    Free plan Open source AndroidAPIiPhone+2

    Choose RevenueCat if your app needs purchase and subscription management, configurable paywalls, or purchase analytics across platforms.

    8.7 Free plan Visit site
  2. 2

    Epic Online Services

    Free plan AndroidAPIiPhone+4

    Epic Online Services groups social, multiplayer, data, and safety tools for game development, with a free plan and several SDK platforms.

    7.5 Free plan Visit site
  3. 3

    OneSignal

    by OneSignal
    Free plan WebWindowsMac+2

    OneSignal brings several messaging channels, segmentation and automation into one platform, with a free plan and month-to-month Growth option.

    7.3 Free plan · paid from $19/mo Visit site
  4. 4

    Meta Business Suite

    by Meta Business Suite
    Free plan AndroidiPhoneWeb

    Choose Meta Business Suite if you manage business activity on Facebook and Instagram and want publishing, messaging, and insights together.

    7.2 Free plan Visit site
  5. 5

    Oracle Cloud Infrastructure Container Registry

    Free plan APILinuxWeb
    7.0 Free plan Visit site
  6. 6

    Steamworks

    Free plan APILinuxMac+1

    Choose Steamworks if you plan to distribute a game or software product through Steam and want access to its portal, APIs, and optional game services.

    7.0 From $100 Visit site
  7. 7

    Apple Simulator

    Free plan Mac

    Apple Simulator brings device simulation, debugging, network simulation, snapshots, and automation access to Mac-based development. It is free, but the listed host platform is limited to macOS.

    6.3 Free plan Visit site
  8. 8

    Firebase SDKs

    Free plan AndroidiPhoneWeb
    6.2 Free plan Visit site
  9. 9

    Stream SDKs

    Free plan AndroidiPhoneLinux+3
    6.1 Free plan · paid from $399/mo (annual) Visit site
  10. 10

    Plaid

    Free trial AndroidAPIiPhone+1

    Choose Plaid if your app or service needs financial account connections, financial data, or bank payment processing across its listed products.

    6.0 Pricing on request Visit site
  11. 11

    Google Cloud Client Libraries

    Free plan Web
    5.9 Free plan Visit site
  12. 12

    NVIDIA CUDA Toolkit

    Free plan LinuxWindows
    5.9 Free plan Visit site
  13. 13

    OpenTelemetry SDK

    Free plan
    5.5 Free plan Visit site
  14. 14

    Windows SDK

    Free plan Windows
    5.4 Free plan Visit site
  15. 15

    Agora SDKs

    Paid AndroidiPhoneLinux+3
    5.2 Pricing on request Visit site
  16. 16

    Datadog APM

    Paid AndroidiPhoneWeb
    5.2 From $31/mo (annual) · 14-day trial Visit site
  17. 17

    Azure SDKs

    Paid AndroidiPhoneLinux+3
    4.9 Open source Visit site
  18. 18

    HID SDK

    Paid AndroidLinuxWindows
    4.6 From $500/yr Visit site
  19. 19

    OpenJAUS SDK

    Paid LinuxWindows
    4.2 Pricing on request Visit site
  20. 20

    Unified Automation OPC UA SDKs

    Paid LinuxWindows
    3.9 Pricing on request · 90-day trial Visit site

#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price

Check whether a tool has a free plan, a free trial or open-source code. Compare paid starting prices, source licences, self-hosting and offline support before choosing.

Questions

Are free SDK options listed?

Yes. The list includes tools with free plans, including Apple Simulator, Firebase SDKs, Google Cloud Client Libraries and NVIDIA CUDA Toolkit.

Which SDKs have open-source code?

Azure SDKs are listed as open source. Check the source and licence details for any tool before using or modifying its code.

Are free trials available?

A free trial is available for an item on the list. Datadog APM lists a 14-day trial and starts at $31 per month with annual billing.

Can I find SDKs for my platform?

Platforms represented include web, Android, Windows, Linux, iOS and macOS. Review the platform fields for the SDK you are considering.

Do paid SDKs show starting prices?

Prices vary. Agora SDKs and OpenJAUS SDK show pricing on request; Datadog APM starts at $31 per month annually, and HID SDK starts at $500 per year.

More in Developer Tools