API Integrations

(408 tools)
API integration tools connect software systems and automate data sharing across your stack. Used by developers, growth teams, and no-code builders to sync platforms, reduce manual work, and build reliable automated workflows.
  • BILL an invoice tool, featuring ap automation, payment scheduling, approval workflows, invoice capture, erp integration.

    BILL

    Automate accounts payable and approval workflows.

    Free Trial • No Code

    #invoice

    $45 / Month
  • Bonsai an invoice tool, featuring contract management, time tracking, recurring billing, expense tracking, proposal builder.

    Bonsai

    Manage contracts, track time and bill clients in one app.

    Free Trial • No Code

    #invoice

    $9 / Month
  • HoneyBook an invoice tool, featuring proposal management, online payments, workflow automation, contract signing, client communication.

    HoneyBook

    Send proposals and collect payments with automated workflows.

    Free Trial • No Code

    #invoice

    $36 / Month
  • Invoice Ninja an invoice tool, featuring custom invoices, client portal, recurring billing, multiple gateways, quote management.

    Invoice Ninja

    Build custom invoices with client portals and recurring billing.

    Free Trial • No Code • Open Source

    #invoice

    $14 / Month
  • Square Invoices an invoice tool, featuring quick invoicing, recurring invoices, digital payments, estimates creation, pos integration.

    Square Invoices

    Create invoices and get paid instantly via mobile.

    Free Trial • No Code

    #invoice

    Free
  • Zoho Invoice an invoice tool, featuring free invoicing, client portal, recurring invoices, payment reminders, custom templates.

    Zoho Invoice

    Create and send invoices for free with automation.

    Free Trial • No Code

    #invoice

    Free
  • Salesmsg a sms marketing tool, featuring shared inbox, crm sync, sms automation, calling support.

    Salesmsg

    Collaborate on sales texts with shared inbox and CRM.

    Free Trial • No Code

    #sms-marketing

    $25 / Month
  • Postscript a sms marketing tool, featuring shopify integration, cart recovery, sms automation, revenue tracking.

    Postscript

    Recover abandoned carts with Shopify SMS automation.

    Free Trial • No Code

    #sms-marketing

    Free
  • Textedly a sms marketing tool, featuring bulk messaging, scheduled campaigns, mms support, text-to-pay.

    Textedly

    Send bulk SMS campaigns with payment collection.

    Free Trial • No Code

    #sms-marketing

    $29 / Month
  • Twilio a sms marketing tool, featuring programmable api, global messaging, multi-channel support, workflow automation.

    Twilio

    Build scalable messaging apps using flexible APIs.

    Free Trial

    #sms-marketing

    Custom Pricing
  • TextMagic a sms marketing tool, featuring pay as you go, two-way sms, international support, bulk messaging, api access.

    TextMagic

    Send global SMS with flexible pay-as-you-go pricing.

    Free Trial • No Code

    #sms-marketing

    $30 / Month
  • EZ Texting a sms marketing tool, featuring bulk messaging, text automations, ai compose, two-way texting.

    EZ Texting

    Send AI-assisted bulk texts and automations easily.

    Free Trial • No Code

    #sms-marketing

    $25 / Month
  • SimpleTexting a sms marketing tool, featuring bulk messaging, drip campaigns, two-way messaging, keyword responses.

    SimpleTexting

    Simplify bulk texting with smart automation features.

    Free Trial • No Code

    #sms-marketing

    $29 / Month
  • SlickText a sms marketing tool, featuring bulk messaging, campaign automation, two-way messaging, loyalty programs, mms support.

    SlickText

    Engage audiences with bulk SMS and loyalty programs.

    Free Trial • No Code

    #sms-marketing

    $29 / Month
  • Attentive a sms marketing tool, featuring ai personalization, advanced segmentation, omnichannel automation, two-way messaging, cart recovery.

    Attentive

    Personalize journeys with AI-powered SMS marketing automation.

    Free Trial • No Code

    #sms-marketing

    Custom Pricing
  • FL Studio an audio editor tool, featuring beat sequencing, piano roll, lifetime updates, vst support.

    FL Studio

    Make beats with powerful piano roll and sequencing.

    Free Trial • No Code

    #audio-editor

    $99 / Lifetime
  • REAPER an audio editor tool, featuring unlimited tracks, vst plugins, multichannel routing, scripting support.

    REAPER

    Customize your DAW with unlimited tracks and plugins.

    Free Trial • No Code

    #audio-editor

    $60 / Lifetime
  • Paycom a payroll tool, featuring single database, employee self service, payroll automation, talent acquisition, expense tracking.

    Paycom

    Simplify HR and payroll with a unified employee database.

    No Code

    #payroll

    Custom Pricing
  • Paylocity a payroll tool, featuring payroll automation, workforce analytics, talent management, employee engagement, benefits management.

    Paylocity

    Unify payroll, HR, and talent management in one platform.

    No Code

    #payroll

    Custom Pricing
  • Deel a payroll tool, featuring global hiring, contractor payments, eor services, multi currency, compliance automation.

    Deel

    Hire and pay global talent with full compliance support.

    No Code

    #payroll

    Free
  • Zoho Payroll a payroll tool, featuring zoho ecosystem integration, automated salary calculation, tax compliance, employee self service, leave management.

    Zoho Payroll

    Integrate payroll seamlessly within your Zoho apps ecosystem.

    Free Trial • No Code

    #payroll

    $29 / Month
  • Paychex Flex a payroll tool, featuring payroll tax admin, benefits integration, hr management, compliance support, employee self service.

    Paychex Flex

    Access dedicated support for your payroll and HR needs.

    No Code

    #payroll

    $39 / Month
  • QuickBooks Payroll a payroll tool, featuring accounting integration, automated tax filing, direct deposit, time tracking, employee portal.

    QuickBooks Payroll

    Sync payroll directly with your QuickBooks accounting.

    Free Trial • No Code

    #payroll

    $50 / Month
  • ADP RUN a payroll tool, featuring tax compliance, multi jurisdiction support, hr analytics, scalable solutions, expert support.

    ADP RUN

    Scale your payroll with advanced compliance and analytics.

    No Code

    #payroll

    Custom Pricing
  • Rippling a payroll tool, featuring global payroll support, hris integration, automated onboarding, compliance automation, time tracking.

    Rippling

    Automate global payroll, HR, and IT operations seamlessly.

    No Code

    #payroll

    $8 / Month
  • OnPay a payroll tool, featuring automated tax filing, multi state payroll, unlimited pay runs, employee self service, pto management.

    OnPay

    Handle payroll with flat rates and full tax automation.

    Free Trial • No Code

    #payroll

    $55 / Month
  • Gusto a payroll tool, featuring automated tax filing, benefits administration, time tracking, employee self service, contractor payments.

    Gusto

    Streamline payroll, taxes, and benefits for your US team.

    Free Trial • No Code

    #payroll

    $40 / Month
  • Zoho Notebook a note taking tool, featuring smart cards, cloud sync, audio notes, web clipper, gesture support.

    Zoho Notebook

    Organize notes using smart cards with audio and web clipping.

    Free Trial • No Code

    #note-taking

    $2 / Month
  • Joplin a note taking tool, featuring open source markdown, e2e encryption, cross platform, evernote import, notebooks tags.

    Joplin

    Manage encrypted Markdown notes with open source freedom.

    No Code • Open Source

    #note-taking

    $3 / Month
  • Evernote a note taking tool, featuring web clipper, ocr search, notebook organization, cross device sync, ai transcription.

    Evernote

    Capture web content and organize notes with powerful search tools.

    Free Trial • No Code

    #note-taking

    $15 / Month

What Are API Integrations?

API integration tools let software systems talk to each other and share data automatically. They connect apps through programmatic interfaces, removing the need for manual data transfers. Teams use them to automate workflows and keep business data in sync.

Developers, technical founders, and operations teams use these tools daily. Agencies building client solutions rely on them to link platforms together. Any team running more than two software tools will likely need an API integration layer to function efficiently.

Key Capabilities of Top Platforms

  • Endpoint Management: Define, organize, and monitor API endpoints from a central interface without touching raw server code.
  • Authentication Handling: Supports OAuth, API keys, and token-based access to keep data transfers secure and compliant.
  • Real-Time Webhooks: Push live data between systems the moment an event triggers, removing polling delays entirely.
  • Error Logging and Alerts: Tracks failed requests automatically and notifies teams before small issues become costly outages.
  • Rate Limit Controls: Manage call frequency to protect connected systems from overload and maintain stable performance.

Who Is This Collection For?

  • Backend Developers: Build and manage custom integrations between internal services and third-party platforms at scale.
  • No-Code Builders: Connect apps visually without writing code, using pre-built connectors for common business tools.
  • Growth Teams: Sync customer data across marketing and sales tools to run accurate, automated campaigns. For campaign execution, many teams pair these with marketing automation tools.
  • SaaS Founders: Expose product data through public APIs so customers can build on top of their platform.

How to Choose the Right Platform

  • Integration Depth: Check whether the tool supports the specific endpoints your stack requires, not just surface-level connections.
  • Scalability Limits: Review call volume caps and pricing tiers carefully. Costs can rise fast as usage grows. For teams scaling data pipelines, consider pairing with tech development tools.
  • Developer Experience: Good documentation, sandbox environments, and clear error messages save hours of troubleshooting time. Teams building automated pipelines also benefit from no-code tools for faster deployment.

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