Finding the possibilities
Alternatives
10 best modbus alternatives
Tools that cover the same task as modbus (industrial iot), ranked by how completely their pricing, free tier and API access are documented. Checked Oct 4, 2026.
- modbus starts at
- Not listed
- Free plan
- Free tier unknown
- API
- API unknown
- 01
Appetize
Appetize.io streams Android emulators and iOS simulators in the browser for demos, support, testing, and Playwright-based mobile automation. Teams launch cloud devices without maintaining local device labs.
Best for: Support, sales, QA, and engineering teams needing instant mobile app previews in the browser.
- 02
Calculator.Tools
Creators publish shareable links, browse community apps, and upgrade for saved apps and stronger models.
Best for: Non-developers and teachers who want one-page AI-generated tools without hosting or coding.
- 03
Keragon
Keragon is a HIPAA-compliant healthcare automation platform with no-code workflows, AI agents, and 400+ integrations. Clinics and digital health companies automate intake, scheduling, billing, and patient communication while keeping data on Keragon’s compliant infrastructure.
Best for: Healthcare practices and digital health startups automating patient ops without custom engineering.
- 04
TestLabs
TestLabs automates Google Play compliance testing on real Android devices for developers and studios. Plans allocate concurrent real-device testers, multi-day test windows, logs, screenshots, and analytics to accelerate store approval.
Best for: Android developers and gaming studios needing Play Store real-device testing without maintaining device labs.
- 05
Zyntra
Zyntra provides disposable and persistent test mailboxes for QA and automation teams to capture signup, OTP, and transactional emails via UI or API. It targets Playwright, Cypress, and CI workflows that need isolated inboxes with Swagger-documented HTTP access.
Best for: QA engineers and test automators validating email flows without sharing personal inboxes or flaky temp mail services.
- 06
Hook Relay
Hook Relay provides webhooks-as-a-service with reliable delivery, retries, payload logging, SSRF protections, and debugging for outbound webhook integrations. It targets teams that want Stripe-quality webhook infrastructure without building a custom backend.
Best for: SaaS vendors and integrators adding customer-facing webhooks with observability and retry policies.
- 07
Esper
Esper provides device management infrastructure for dedicated Android, iOS, Linux, and Windows devices at the edge. It covers provisioning, kiosk mode, app deployment, telemetry, and policy enforcement for POS, kiosks, clinical hardware, and other fixed-purpose fleets.
Best for: Enterprises operating dedicated device fleets that need cloud MDM with industry-specific tooling.
- 08
Row Zero
Row Zero is a cloud spreadsheet built for big data workloads, connecting to warehouses such as Snowflake, Databricks, BigQuery, Postgres, and S3 while offering Excel-compatible functions, Python, pivot tools, and an AI spreadsheet agent. The company notes it has been acquired by Databricks.
Best for: Analysts and engineers who outgrow desktop Excel limits and need warehouse-connected spreadsheets in the cloud.
- 09
CustomJS
The site positions the service for Make.com, Zapier-style workflows and AI projects that need server-side code without managing infrastructure.
Best for: No-code builders and integrators who want hosted Node.js logic, PDFs, and form backends inside automation platforms.
- 10
Cactus Compute
Cactus Compute builds automation foundation models for tiny on-device targets such as phones, wearables, robots, and microcontrollers. Its Needle models run locally in small 8–29 MB footprints with tool-calling and structured extraction, plus hosted fine-tuning on Cactus GPUs.
Best for: Edge and embedded teams that need compact local models and optional hosted fine-tuning for Needle on device constraints.
modbus alternatives: common questions
What is the best free alternative to modbus?
Appetize has an ongoing free plan. Pricing lists a Free plan at $0 per month with two active devices and 30 minutes refilled monthly. Free plans change, so check the vendor before relying on one.
What is the cheapest modbus alternative?
Calculator.Tools has the lowest listed starting price at $5.99/mo.
Which modbus alternatives have an API?
Appetize, Calculator.Tools, Keragon, Zyntra, Hook Relay mention API or developer access.